Infrared light reflector, infrared light reflecting laminated glass, and laminated glass and laminate having cholesteric liquid crystal layers

the layered product which has an infrared light light reflector, infrared light reflexibility Together glass, and a cholesteric liquid crystal layer -- and -- uniting -- glass

0001The present invention is an infrared light light reflector which carries out two or more owners of the light reflex layer which fixes a cholesteric-liquid-crystal phase, and relates to the infrared light light reflector mainly used for thermal insulation of windows, such as a building and vehicles, and the infrared light reflexibility Together glass using it. The present invention used the layered product which has a cholesteric liquid crystal layer, and the layered product concerned, and relates to glass.

0002In recent years, the needs from a rise of concern about environment and energy to the industrial commodity about energy saving are great, and the glass and the film which have an effect in decreasing the heat load by thermal insulation of windowpanes, such as a residence and a car, i.e., sunlight, are called for as one of them. It is required for decreasing the heat load by sunlight to prevent the penetration of the sunrays of either the light range of a sunlight spectrum or an infrared region.

0003The double-glazed glass which coated the special metal membrane which intercepts the thermal radiation called Low-E double-glazed glass is well used as eco-glass with high heat insulation / thermal insulation nature. A special metal membrane is producible by laminating two or more layers by the vacuum forming-membranes method indicated by patent documents 1, for example. vacuum membrane formation -- although coating of these special metal membranes produced is very excellent in reflective performance, a vacuum process has low productivity and is high. [ of a production cost ] When a metal membrane is used, in order to cover electromagnetic waves simultaneously, when an electric wave obstacle is caused or it is used for a car, there is a problem of being unable to use ETC by use of a mobile phone etc.<br />The Hot wire reflexibility transparent substrate which has a layer containing metal particulates in patent documents 2 is proposed. There is a problem that the film containing metal particulates has the low reflectance to the light of the range of 700-1200-nm wavelength which participates in thermal insulation greatly although excelled in the penetration performance of visible light, and it cannot make thermal insulation performance high.<br />The Hot wire interception sheet which has a layer which contains infrared resonance pigment in patent documents 3 is indicated. When infrared resonance pigment is used, there is a problem that thermal insulation performance falls by the film surface rise in heat by absorption of Japanese Shoot of what can lower solar transmittance, and re-discharge of the heat.

0004The lamination optical film which has the reflective power to infrared rays which has a phase contrast film of the predetermined characteristic and a reflected type circular light board is indicated by patent documents 4, and the example using a cholesteric-liquid-crystal phase is indicated as the phase contrast film.<br />The infrared light reflexibility article which equipped patent documents 5 with the visible light transmittance state substraight and the infrared light reflexibility cholesteric liquid crystal layer is indicated.<br />Although the polarization element which equipped patent documents 6 with a plurality of cholesteric liquid crystal layers is indicated, the use in which the light of a light range is reflected efficiently is mainly presented with such a layered product that laminates a cholesteric liquid crystal layer.<br />While the direction of the helical axis of a liquid crystal molecule is substantially in agreement, the circular light extraction optical element which laminates multiple liquid crystal layers with same turning direction of the liquid crystal molecule is indicated by patent documents 7.

0005It is difficult to reflect the light of a specific wavelength completely using the light reflex film which actually has a light reflex layer which fixes a cholesteric-liquid-crystal phase, and it is usually common to use the special retardation film called lambda/2 board. For example, with patent documents 4 and 5, the trial which reflects the right polarization and left bias light of a predetermined wavelength is conducted by forming in both sides of lambda/2 board the light reflex layer which fixes the cholesteric-liquid-crystal phase which has the optical rotation of the same direction and has the same spiral pitch, respectively.

0006However, lambda/2 board is a special retardation film, the production is difficult for it, and production cost goes up as described above. It may be restricted to what has a special material, and, as a result, a use may be restricted. Although lambda/2 board acts as lambda/2 board to the light which enters from Normal to a stratification plane, it does not usually function as lambda/2 board strictly to the light which enters from across. Therefore, in the composition which combined the lambda/2 above-mentioned board, there is a problem that the light which enters from across cannot be reflected completely.

0007On the other hand, conventionally, the glass of two or more sheets is pasted up by a middle film, when it damages, the glass fragment was kept from scattering, and glass is variously proposed as a member for cars, etc. Polyvinyl butyral resin is used as a material of an inside question film. Such composition unites, and to glass, a light-fast examination is done a priori, it irradiates with purple outdoor daylight when putting in practical use, for a long time, and the existence of degradation is checked.<br />By the way, to propose a cholesteric-liquid-crystal phase not only about the use as a light reflex layer but about the use as various functional layers, such as a layer from which hue changes with electric fields, to unite a cholesteric liquid crystal layer, and to insert into glass is also tried (for example, Example 1 of patent documents 8). However, if it has a cholesteric liquid crystal layer inside and a light-fast examination is done about glass, air bubbles are formed and utilization requires an improvement.

<p num="0008"><patcit num="1"><text>JP,6-263486,A</text></patcit><patcit num="2"><text>JP,2002-131531,A</text></patcit><patcit num="3"><text>JP,6-194517,A</text></patcit><patcit num="4"><text>The patent No. 4109914 gazette</text></patcit><patcit num="5"><text>Patent Publication Heisei No. 514022 [ 2009 to ] gazette</text></patcit><patcit num="6"><text>The patent No. 3500127 gazette</text></patcit><patcit num="7"><text>The patent No. 3745221 gazette</text></patcit><patcit num="8"><text>JP,2008-304762,A</text></patcit></p>

<p num="0009">Therefore, the 1st subject of the present invention is improving the reflective characteristic about an infrared light light reflector which carries out two or more owners of the light reflex layer which fixes a cholesteric-liquid-crystal phase, without making use of lambda/2 board indispensable. And it is improving the selective reflection characteristic of an infrared light light reflector which carries out two or more owners of the light reflex layer which fixes a cholesteric-liquid-crystal phase, and providing an infrared light light reflector especially with high thermal insulation nature.<br />The 2nd subject of the present invention makes it a subject to have a cholesteric liquid crystal layer inside and to improve the lightfastness of glass.</p>

<p num="0010">While having the selective reflection characteristic over the light of the same wavelength band as a result of this artificer's inquiring wholeheartedly in order to solve the 1st subject, It turned out that both the left circular light of the wavelength band concerned and the right circular light can be reflected, without being affected in the optical characteristic of a substrate, when making the light reflex layer which fixes the cholesteric-liquid-crystal phase of reverse optical rotation (namely, the right or the left optical rotation) mutually adjoin and having arranged on the substrate. While having the selective reflection characteristic over the light of other wavelength bands, knowledge that broadband-ization of the reflective characteristic can be attained by further laminating 1 set of the light reflex layer which fixes the cholesteric-liquid-crystal phase of reverse optical rotation (namely, the right or the left optical rotation) mutually was also acquired. However, when the light reflex layer which fixes a cholesteric-liquid-crystal phase tended to be made to adjoin and it was going to form by the simple application method, it turned out that the control for Arrangement of the upper light reflex layer becomes difficult, and the desired characteristic may not be acquired. As a result of further inquiring based on this knowledge, knowledge that the selective reflection characteristic is improved as it is short wavelength, and an infrared light light reflector especially with high thermal insulation nature is obtained rather than the reflective center wavelength of the light reflex layer by which the reflective center wavelength of the light reflex layer arranged more at a lower layer is arranged more at the upper layer is acquired, and it came to complete the present invention.</p><p num="0011">The 1st means for solving problem of the above is as follows.<br />[1] It has at least four light reflex layers X1, X2, X3, and X4 which fix a cholesteric-liquid-crystal phase on the surface of at least 1 side of a substrate and a substrate in this order from the substrate side,<br />light reflex layers X1 and X2 -- each reflective center wavelength -- lambda_１It is (nm) and reflects the circular light of an opposite direction mutually equally and mutually,<br />Each reflective center wavelength of light reflex layers X3 and X4 is lambda._２It is (nm), the circular light of an opposite direction is reflected mutually equally and mutually, and it is in a row,<br />lambda_１&lt;lambda_２It is satisfied,<br />The infrared light light reflector which reflects infrared rays with a wavelength of 700 nm or more.<br />[2] Reflective center wavelength lambda of light reflex layers X1 and X2_１(nm) is in the range of 800-1150 nm, and it is reflective center wavelength lambda of light reflex layers X3 and X4._２The infrared light light reflector of [1] which has (nm) in the range of 1000-1400 nm.<br />[3] while light reflex layer X1 and light reflex layer X3 reflect the circular light of the respectively same hand of cut -- the infrared light light reflector of [1] or [2] in which the order for Arrangement of light reflex layer X1 is higher than the order for Arrangement of light reflex layer X3.<br />[4] While light reflex layer X1 and light reflex layer X3 reflect the circular light of the respectively same hand of cut, while light reflex layer X2 and light reflex layer X4 reflect the circular light of the respectively same hand of cut more highly [ the order for Arrangement of light reflex layer X1 ] than the order for Arrangement of light reflex layer X3 -- the infrared light light reflector of [1] or [2] in which the order for Arrangement of light reflex layer X2 is higher than the order for Arrangement of light reflex layer X4.<br />[5] One infrared light light reflector of [1] - [4] in which light reflex layer X1 and light reflex layer X3 contain the chiral agent of right wheel nature, and light reflex layers X2 and X4 contain the chiral agent of anticlockwise rotation nature.<br />[6] a light reflex -- a layer -- X -- two -- X -- three -- and -- X -- four -- respectively -- a lower layer -- a light reflex -- a layer -- the surface -- applying -- having had -- a liquid crystal -- a constituent -- cholesteric liquid crystal -- a phase -- carrying out -- being concerned -- cholesteric liquid crystal -- a phase -- fixing -- things -- forming -- having had -- a layer -- it is -- [-- one --] - [-- four --] -- either -- infrared light -- a light reflector .<br />[7] One infrared light light reflector of [1] - [6] whose above-mentioned substrates are polymer films.<br />[8] One infrared light light reflector of [1] - [7] which has an easy-bonding layer as at least one outermost layer.<br />[9] The infrared light light reflector of [8] in which the above-mentioned easy-bonding layer contains polyvinyl butyral resin.<br />[10] [8] or [9] infrared light light reflectors in which the above-mentioned easy-bonding layer contains at least one sort of ultraviolet ray absorbents.<br />[11] Two glass boards and the infrared light reflexibility Together glass which has one infrared light light reflector of [1] - [10] in the meantime.</p><p num="0012">In order to solve the 2nd subject of the above, as a result of this artificer's examining many things, knowledge that the air bubbles formed when it has the above-mentioned cholesteric liquid crystal layer inside and a light-fast examination is done about glass are generated between a cholesteric liquid crystal layer and a middle film was acquired. As a result of inquiring based on this knowledge, it is generating of these air bubbles, Knowledge that this problem can be solved is acquired by forming the layer which has the easy adhesiveness to a middle film further as that it is what is depended on the adhesion power of a cholesteric liquid crystal layer and a middle film being insufficient, and the outermost layer which touches a middle film, and it came to solve the present invention.</p><p num="0013">The 2nd means for solving problem of the above is as follows.<br />[12] The layered product which has at least a substrate and an easy-bonding layer which contains polyvinyl butyral resin at the surface and/or its back as the cholesteric liquid crystal layer more than one layer or two-layer, and the outermost layer of at least 1 side.<br />[13] The layered product of [12] which is the layer which the above-mentioned easy-bonding layer applied the coating liquid containing polyvinyl butyral resin to the surface of a cholesteric liquid crystal layer, and was formed.<br />[14] The layered product of [12] or [13] which has an easy-bonding layer containing polyvinyl butyral resin as both outermost layers.<br />[15] The layered product of [12] or [13] which has the above-mentioned easy-bonding layer as one outermost layer, and has an undercoat layer containing either which is chosen from an acrylic resin, urethane resin, and polyester resin as the outermost layer of another side.<br />[16] One layered product of [12] - [15] in which the above-mentioned easy-bonding layer contains at least one sort of ultraviolet ray absorbents.<br />[17] The layered product of [16] whose above-mentioned easy-bonding layer is a layer which makes transmissivity of ultraviolet rays with a wavelength of 380 nm or less 0.1% or less.<br />[18] It has one reflexibility layered product of [12] - [17] in the meantime, and is [ two glass boards which have a middle film in each inside, and ] glass.<br />[19] [18] containing polyvinyl butyral resin or an ethylene-vinyl acetate copolymer unites, and the above-mentioned middle film is glass.</p>

<p num="0014">According to the 1st present invention, the reflective characteristic can be improved about the infrared light light reflector which carries out two or more owners of the light reflex layer which fixes a cholesteric-liquid-crystal phase, without making use of lambda/2 board indispensable. According to the present invention, the selective reflection characteristic of the infrared light light reflector which carries out two or more owners of the light reflex layer which fixes a cholesteric-liquid-crystal phase can be improved, and an infrared light light reflector especially with high thermal insulation nature can be provided.<br />According to the 2nd present invention, it has a cholesteric liquid crystal layer inside, and can improve the lightfastness of glass.</p>

0015<figref num="1">It is a sectional view of an example of the infrared light light reflector of the 1st present invention.</figref><figref num="2">It is a sectional view of an example of the infrared light light reflector of the 1st present invention.</figref><figref num="3">It is a sectional view of an example (it is also an example of the layered product of the 2nd present invention) of the infrared light light reflector of the 1st present invention.</figref><figref num="4">It is a sectional view of an example (it is also an example of the layered product of the 2nd present invention) of the infrared light light reflector of the 1st present invention.</figref><figref num="5">It is a sectional view of an example of the layered product of the 2nd present invention.</figref><figref num="6">It is a sectional view of an example of the layered product of the 2nd present invention.</figref><figref num="7">The 2nd present invention unites and it is a sectional view of an example of glass.</figref><figref num="8">The 2nd present invention unites and it is a sectional view of an example of glass.</figref><figref num="9">It is the microphotograph used in order to explain the order for Arrangement of the layer which fixes a cholesteric-liquid-crystal phase.</figref>

0016Hereinafter, the present invention is explained in detail. The numerical value range expressed using "-" in this specification means the range which includes the numerical value indicated before and behind "-" as a lower limit and upper limit.<br />In this specification, the order for Arrangement of the layer which fixes a cholesteric-liquid-crystal phase is defined as follows.<br />In this specification, the order for Arrangement of the layer which fixes a cholesteric-liquid-crystal phase is one index of defining as average value of the angle which a film surface and the screw axis of a cholesteric-liquid-crystal phase make, and expressing the homogeneity of liquid crystal molecular orientation. The above-mentioned angle can be checked by carrying out electron microscope observation of the section of the layer which fixes a cholesteric-liquid-crystal phase. When order is the highest, the shade image which appears 1/2 cycle of the spiral pitch of cholesteric liquid crystal appears in parallel with a film surface. An example of the microphotograph was shown in Drawing 9. This shade image is connected with the direction of the liquid crystal molecule in a section, and that this regular striped pattern is parallel to a film surface shows that the screw axis of a cholesteric-liquid-crystal phase is perpendicular uniformly to a film surface. On the other hand, when order is low, the striped interval is the same, but the rate and gap angle of the field increase as the field where it shifted from the film surface method line, the field, i.e., the screw axis, which are not parallel to a film surface, exists and order becomes low. Therefore, the order for Arrangement can carry out electron microscope observation of the section of a sample, can obtain the shade image which appears 1/2 cycle of the spiral pitch of cholesteric liquid crystal, can compute the angle of the altitude of each of those stripes, and a film surface, respectively, and, specifically, can ask for it as the average value.

0017In this specification, refractive-index anisotropic deltan of the layer which fixes a cholesteric-liquid-crystal phase is defined as follows.<br />Refractive-index anisotropic deltan of the layer formed by fixing a cholesteric-liquid-crystal phase as used herein means deltan in the wavelength (specifically wavelength of about 1000 nm) which shows the selective reflection characteristic. It forms on the substrate (glass, film) which carried out orientation treatment of the layer which first specifically fixed the cholesteric-liquid-crystal phase to which for [ of the screw axis ] Arrangement was uniformly carried out to the film surface as a sample, or gave the film for Arrangement. The selective reflection of the layer concerned is measured and it asks for the peak width Hw. Spiral pitch p of a sample is measured separately. The spiral pitch is measurable by carrying out section TEM observation. It can ask for refractive-index anisotropic deltan of a sample by assigning these values to the following formulas.<br />deltan=Hw/p

0018Of course, the error generally permitted about "the reflective center wavelength of each class is mutually equal" in the technical field to which the present invention belongs is also taken into consideration among this specification. Generally, it will be considered that it is the same even if there is an about ±30-nm difference about a reflective center wavelength.

0019<u style="single">The 1st present invention</u><br />Hereinafter, the embodiment of the infrared light light reflector of the 1st present invention is described using a drawing.<br />The infrared light light reflector shown in Drawing 1 has light reflex layers 14a, 14b, 16a, and 16b which fix a cholesteric-liquid-crystal phase to one surface of substrate 12, respectively. Substrate 12 is a polymer film, for example. There is no restriction in particular about the optical characteristic. Especially in the present invention, the member which has variation about retardation Re within a field may be used as a substrate. It is distinguished from the conventional technology which uses that optical characteristic for the improvement of the light reflex characteristic positively at this point using lambda/2 as a substrate. However, it does not bar using retardation films to which phase contrast is adjusted correctly, such as lambda/2 board, as substrate 12.

0020It may be a retardation film which restriction in particular does not have about the optical characteristic of substrate 12, and specifically shows phase contrast, or may be an isotropic substrate optically. That is, substrates 12 do not need to be retardation films, such as lambda/2 board with which the optical characteristic was adjusted strictly. In the present invention, the variation in retardation Re (1000) within a field in the wavelength of 1000 nm of substrate 12 may consist of a polymer film etc. which are 20 nm or more. The variation in Re (1000) may consist of a polymer film etc. which are 100 nm or more. There is no restriction in particular also about the retardation within a field of a substrate, for example, retardation Re (1000) with a wavelength of 1000 nm within a field can use the retardation film etc. which are 800-13000 nm. The example of the polymer film which can be used as a substrate is mentioned below.

0021Since light reflex layers 14a, 14b, 16a, and 16b are layers which fix a cholesteric-liquid-crystal phase, they show the optical selective reflection nature which reflects the light of a specific wavelength based on the spiral pitch of the cholesteric-liquid-crystal phase concerned. Light reflex layers 14a and 14b which adjoin in this embodiment are the reflective center wavelength lambda while the direction of a spiral of each cholesteric-liquid-crystal phase is mutually reverse._１４It is the same in But. Similarly, adjoining light reflex layers 16a and 16b are the reflective center wavelength lambda while the direction of a spiral of each cholesteric-liquid-crystal phase is mutually reverse._１６It is the same in But. At this embodiment, it is lambda._１４!=lambda_１６Since it is satisfied, it is predetermined wavelength lambda by light reflex layers 14a and 14b._１４While carrying out selective reflection of the Left of circular light Right and wrong circular light, it is wavelength lambda by light reflex layers 16a and 16b._１４also depending -- predetermined wavelength lambda which is long wavelength_１６Selective reflection of Left of circular light and the right circular light is carried out.

0022Main wavelength lambda of the selective reflection infrared light light reflector 10 shown in Drawing 1 is an infrared light light reflector which reflects infrared rays with a wavelength of 700 nm or more, namely, according to light reflex layers 14a and 14b_１４And main wavelength lambda of the selective reflection by light reflex layers 16a and 16b_１６It is preferred Also and to have a wavelength of 700 nm or more, respectively. Infrared light light reflector 10 is lambda._１４&lt;lambda_１６It is satisfied. At an example, it is reflective center wavelength lambda._１４It is in But and the range of 800-1150 nm (preferably 850-1100 nm or 800-1050 nm), and is reflective center wavelength lambda._１６It is in But and the range of 1000 nm - 1400 nm (preferably 1050-1350 nm or 1050-1300 nm).

0023Generally, the spiral pitch of the cholesteric-liquid-crystal phase which shows the above-mentioned reflective center wavelength is about (preferably they are about 500-900 nm, more preferably about 550-800 nmnm) 500-1350 nm. The thickness of each light reflex layer is 1 micrometer - about (preferably about 3-8 micrometers) 8 micrometers. However, it is not limited to these ranges. By adjusting the kind of material (mainly liquid crystal material and a chiral agent) used for formation of a layer, its concentration, etc., the light reflex layer of a desired spiral pitch can be formed. Thickness of a layer can be made into the desired range by adjusting the amount of applications.

0024Adjoining light reflex layers 14a and 14b have the mutually reverse direction of a spiral of each cholesteric-liquid-crystal phase, and adjoining light reflex layers 16a and 16b have the mutually reverse direction of a spiral of each cholesteric-liquid-crystal phase in a similar manner as described above. Thus, it consists of a reverse cholesteric-liquid-crystal phase, and can reflect the both sides of the left circular light of the wavelength, and the right circular light because the main wavelength of selective reflection adjoins and arranges the same light reflex layer. This operation is unrelated to the optical characteristic of substrate 12, and it is the operation obtained without being influenced by the optical characteristic of substrate 12.

0025On the other hand, it was made conventionally difficult to form adjacently the light reflex layer which consists of a desired cholesteric-liquid-crystal phase. For example, method of forming the layer which consists of a desired cholesteric-liquid-crystal phase, respectively, and laminating and pasting these layers together on a separate temporary base material; Or the material which can form the cholesteric-liquid-crystal phase which is suitable as each light reflex layer in a liquid crystal constituent is mixed, after applying the constituent concerned to the surfaces, such as a base material, to make a way film, phase separation is carried out at the time of dryness and for Heat distribution, and the method; of forming a two-layer cholesteric liquid crystal layer, etc. are known. However, the method of using the former lamination had the problem that cost becomes high, and film thickness became thick as a whole in the method of using the latter phase separation, and the state for Arrangement got worse, and the state for Arrangement got worse similarly by fluctuation of the interface of phase separation. If the lamination structure of a light reflex layer is acquired by repeating an application, the process of high cost of lamination is unnecessary, and since control called phase separation becomes unnecessary [ a difficult process ], it is desirable. However, it turned out that an application, dryness, and hardening are repeated two or more times, and the control for Arrangement of the liquid crystal at the time of forming the upper layer more becomes difficult in the method of building the lamination structure of the light reflex layer which consists of a cholesteric-liquid-crystal phase. As a result of this artificer's inquiring wholeheartedly, when this cause has Arrangement-oriented disorder in the surface of the light reflex layer which consists of a liquid crystal constituent, even if a liquid crystal constituent tends to be applied to that surface and it is going to form a light reflex layer in it similarly, it is influence of that orientation disorder, Those of the upper light reflex layer for Arrangement were confused, and it turned out that it is a cause that it will not be in the state of a desired cholesteric-liquid-crystal phase. If the order for Arrangement of a cholesteric-liquid-crystal phase becomes low, the shape of a selective reflection peak becomes broadcloth, the maximum reflectance falls, or Hayes by dispersion of the defect for Arrangement occurs, and it is not desirable. That is, when there is a tendency for those of the upper light reflex layer for Arrangement to be confused more, there is a tendency for the selective reflection characteristic which the upper light reflex layer is made to pay more not to fully function. On the other hand, in order to improve an infrared light light reflector in the viewpoint of thermal insulation nature, it is important that the contribution of a heat rise intercepts a large light of short wavelength by reflection among infrared light. In the present invention, by considering it as short wavelength rather than the main wavelength by which selective reflection is carried out more in 1 set of upper light reflex layers, even if the main wavelength by which selective reflection is carried out in 1 set of lower layer light reflex layers builds the lamination structure of each light reflex layer with the above-mentioned coating method, it is enabling offer of the infrared light light reflector which is excellent in thermal insulation nature.

0026Namely, main selection wavelength lambda of the inside of Drawing 1, and 1 set of lower layer light reflex layers 14a and 14b_１４Main selection wavelength lambda of 1 set of upper light reflex layers 16a and 16b_１６But, lambda_１４&lt;lambda_１６It is satisfied. Since it will usually become the tendency for the order for Arrangement of the upper light reflex layer to fall more as described above if it forms with a coating method, it is thought that the order for Arrangement falls in order of light reflex layers 14a, 14b, 16a, and 16b. however, since the order for Arrangement of 1 set of lower layer light reflex layers 14a and 14b is high even if the order for Arrangement of 1 set of upper light reflex layers 16a and 16b is inferior to the order for Arrangement of 1 set of lower layer light reflex layers 14a and 14b, the contribution to the rise effect of heat is large by these -- more -- short wavelength (lambda)_１４The left circular light and the right circular light are reflected by high selectivity. As a result, thermal insulation nature is not spoiled greatly. In respect of thermal insulation nature, as for the order for Arrangement of light reflex layers 14a and 14b, it is preferred that it is 80 degrees or more, and it is most preferred that it is 90 degrees, of course. On the other hand, the order for Arrangement of light reflex layers 16a and 16b may be about 70-80 degrees.

0027According to the coating method, even if 1 set of light reflex layers 14a and 14b and 1 set of light reflex layers 16a and 16b compare, as for the upper light reflex layers 14b and 16b, the order for Arrangement tends to fall more, respectively rather than lower layer light reflex layers 14a and 16a. Among 1 set of light reflex layers which have the same reflective center wavelength and which have a reverse spiral structure mutually, if the order for Arrangement has a difference at this appearance, the selective reflection characteristic may fall. In order to solve this, it is refractive-index anisotropic [ of light reflex layer 14a ] deltan._14aAnd refractive-index anisotropic [ of light reflex layer 14b ] deltan_14bBut, deltan_14b&lt;deltan_14aIt is satisfied and is refractive-index anisotropic [ of light reflex layer 16a ] deltan._16aAnd refractive-index anisotropic [ of light reflex layer 16b ] deltan_16bBut, deltan_16b&lt;deltan_16aIt is preferred that it is satisfied. When this relation is satisfied, light reflex layers 14a and 16a are each even if a liquid crystal constituent is applied to the surface to make a cholesteric-liquid-crystal phase, that state is fixed and it forms light reflex layers 14b and 16b, respectively, The state for Arrangement of light reflex layers 14b and 16b is good, and shows the desired light reflex characteristic. Although the details about the relation between that refractive-index anisotropy satisfies the above-mentioned conditions and this effect are not clear, this artificer has inferred as follows. Although deltan of a light reflex layer is a value changed depending on composition of the polymerization conditions at the time of fixing a cholesteric-liquid-crystal phase, and the liquid crystal constituent used for the formation, it becomes a value near deltan which the cylindrical liquid crystal usually contained by the highest ratio in a constituent shows. Therefore, if deltan forms a light reflex layer using the liquid crystal constituent which contains a higher cylindrical liquid crystal as main materials, deltan of a light reflex layer will also become high naturally. When the concentration of the chiral agent added on the other hand in order to obtain a desired spiral pitch becomes high, since the rate of a compounding ratio of a cylindrical liquid crystal falls relatively, deltan as a constituent becomes small. Therefore, if deltan contains a cylindrical liquid crystal high from the first, and a small amount of additive agents, such as a chiral agent, come out and a lower layer light reflex layer is formed using a certain liquid crystal constituent, deltan of a lower layer light reflex layer will become high. Since deltan will be in a desired cholesteric-liquid-crystal phase state even if it does not add additive agents, such as a chiral agent, a high liquid crystal has neither the disorder of the interface by existence of an additive agent etc., nor Arrangement-oriented disorder, and can form a lower layer. As a result, the state for Arrangement is good and it has inferred it as what is depended on the ability of the light reflex layer of the upper layer which can apply the liquid crystal constituent for the upper layers to the lower layer surface without disorder, can form a desired cholesteric-liquid-crystal phase in it more stably, and is satisfied with it of the desired characteristic as a result to be formed.

0028Light reflex layer 14a consists of a liquid crystal constituent containing the chiral agent of right wheel nature as an example, That is, selective reflection of the right circular light is carried out, and light reflex layer 14b consists of a liquid crystal constituent containing the chiral agent of anticlockwise rotation nature, That is, the example which consists of a liquid crystal constituent which consists of a liquid crystal constituent which carries out selective reflection of the left circular light, and in which light reflex layer 16a contains the chiral agent of right wheel nature in the; said appearance, namely, carries out selective reflection of the right circular light and, in which light reflex layer 16b contains the chiral agent of anticlockwise rotation nature, namely, carries out selective reflection of the left circular light is given. As compared with the chiral agent of the anticlockwise rotation nature by which the chiral agent of the right wheel nature marketed is marketed, what has high twist power exists mostly. According to [ if the higher chiral agent of twist power is used, can lessen the amount of addition more, and ] the above-mentioned example therefore, it is deltan._14b&lt;deltan_14aAnd deltan_16b&lt;deltan_16aEach light reflex layer to satisfy is chosen from a broad kind of material, and can be formed.

0029The sectional view of the infrared light light reflector of other embodiments of the present invention is shown in Drawing 2. Infrared light light reflector 10' shown in Drawing 2 has light reflex layers 14a, 14b, 16a, and 16b on substrate 12 and the surface of one of these like infrared light light reflector 10 of Drawing 1. About these characteristic and its relation, it is the same as that of infrared light light reflector 10. Infrared light light reflector 10' has light reflex layers 18a and 18b on the surface of another side of substrate 12 further. Light reflex layers 18a and 18b also have the feature that the reflective center wavelength with it in which each cholesteric-liquid-crystal phase is the reverse direction of a spiral mutually is the same like light reflex layers 14a and 14b and light reflex layers 16a and 16b. [ mutual ] However, reflective center wavelength lambda of light reflex layers 18a and 18b_１８Is, reflective center wavelength lambda of light reflex layers 14a and 14b_１４And reflective center wavelength lambda of light reflex layers 16a and 16b_１６It is not equal to Any of. Therefore, reflective center wavelength lambda according [ infrared light light reflector 10' ] to light reflex layers 14a and 14b like infrared light light reflector 10_１４The selective reflection characteristic over Left of circular light and the right circular light, and reflective center wavelength lambda by light reflex layers 16a and 16b_１６Reflective center wavelength lambda by light reflex layers 18a and 18b while the selective reflection characteristic over Left of circular light and the right circular light is shown_１８The selective reflection characteristic over Left of circular light and the right circular light is shown, and the wavelength band of selective reflection is broadband-ized more.

0030At an example, it is reflective center wavelength lambda._１４It is But and the range of 800-1000 nm (preferably 850-950 nm), and is lambda._１６It is the range of 900-1100 nm (preferably 950-1050 nm) of But, and is lambda._１８It is the range of 1000-1200 nm (preferably 1050-1150 nm) of But, and also it has a set of other light reflex layers, and the range of the reflective center wavelength of the light reflex layer concerned is 1100-1300 nm (preferably 1150-1250 nm). However, it is not limited to this example.

0031There is no restriction in particular about the formation method of light reflex layers 18a and 18b. After fixing the state for Arrangement after applying a liquid crystal constituent on the surface of a substrate and considering it as a cholesteric-liquid-crystal phase state and forming light reflex layer 18a as a simpler method as described above, the method of forming light reflex layer 18b is mentioned like the surface of light reflex layer 18a. Since lower layer surface quality and the state for Arrangement influence the state for Arrangement etc. of the layer formed on it in this method as described above, when manufacturing by this method, it is refractive-index anisotropic [ of light reflex layer 18a ] deltan._18aAnd refractive-index anisotropic [ of light reflex layer 18b ] deltan_18bIs, deltan_18b&lt;deltan_18aIt is preferred that it is satisfied.

0032The mode of the infrared light light reflector of the present invention is not limited to the mode shown in Drawing 1 and Drawing 2. It may be the composition which carried out light reflex layer lamination more than 3 set (they are six layers in total) on one surface of a substrate, and may be the composition which carried out light reflex layer lamination more than 2 set (they are eight layers in total) on the surface of the both sides of a substrate. The number of light reflex layers may differ on the surface of another side one surface top of a substrate, and it may be the same as shown in Drawing 2. It may be a mode which has 2 or more sets of light reflex layers which show the same reflective center wavelength.

0033Even if the infrared light light reflector of the present invention uses in combination with other infrared light light reflectors for the purpose of broadband-izing a reflective wavelength more, it is easy to be natural [ a light reflector ]. It may have a light reflex layer which reflects the light of a predetermined wavelength by principles other than the selective reflection characteristic of a cholesteric-liquid-crystal phase. The multilayer laminate of a statement, etc. are mentioned to each class which constitutes the composite membrane of a statement, and it in Patent Publication Heisei No. 504555 [ four to ] gazette as a member in which combination is possible, and Special table No. 545556 [ 2008 to ] gazette.

0034The infrared light light reflector of the present invention may have an easy-bonding layer in the outermost layer, in order to make it easy to paste up with other members. The example in which easy-bonding layer 24 was formed was shown in Drawing 3 and Drawing 4, respectively as infrared light light reflector 10 of Drawing 1 and Drawing 2, and the outermost layer of 10'. About easy-bonding layer 24, it is the same as that of the desirable example of the easy-bonding layer used for the 2nd present invention mentioned below. For example, if easy-bonding layer 24 contains polyvinyl butyral resin as the main ingredients, it unites and heat adhesiveness with the middle film of glass improves, and infrared light light reflector 10 and 10' can be united easily, and can be put into glass. Since the adhesion nature of easy-bonding layer 24 and a middle film is high, even if it excels also in lightfastness and is put to available light for a long time, since there is no degradation by generating of air bubbles etc., it is desirable. Since lightfastness is improved and the yellow discoloration by irradiation of prolonged available light can also be controlled if an ultraviolet ray absorbent is added in easy-bonding layer 24 and also it is desirable.

0035Next, the example of the material and the manufacturing method which are used for production of the infrared light light reflector of the 1st present invention is explained in detail.<br />1. Charge of Light Reflex Layer Formation Material<br />In the infrared light light reflector of the present invention, it is preferred to use the liquid crystal constituent of hardenability for formation of each light reflex layer. An example of the above-mentioned liquid crystal constituent contains a cylindrical liquid crystal compound, an optically active compound (chiral agent), and a polymerization initiator at least. Two or more sorts of each ingredients may be included. For example, combined use with the liquid crystal compound of polymerization nature and a non-polymerizable liquid crystal compound is possible. Combined use with a low-molecular-liquid-crystal compound and a liquid crystal polymer compound is also possible. In order to raise Arrangement-oriented homogeneity, application aptitude, and film strength, at least one sort chosen from various additive agents, such as an agent for level Arrangement, a nonuniformity prevention agent, a Reptile prevention agent, and a polymerization monomer, may be contained. In the above-mentioned liquid crystal constituent, it can add if needed in the range in which a polymerization prohibition agent, an antioxidant, an ultraviolet ray absorbent, a SadamuMitsuyasu-ized agent, etc. do not reduce optical performance.

0036(1) Cylindrical liquid crystal compound<br />The example of a cylindrical liquid crystal compound usable to the present invention is a cylindrical nematic liquid crystal compound. In the example of the above-mentioned cylindrical nematic liquid crystal compound, they are azo methine and Azoxy, Cyano biphenyls, cyanophenyl ester, benzoic ester Cyclohexane-carboxylic-acid phenyl ester, cyanophenyl cyclohexane, cyano substitution phenyl pyrimidines, alkoxy substitution phenyl pyrimidines, phenyl dioxanes, tolan, and Arche nil cyclohexyl benzonitriles are used preferably. Not only a low-molecular-liquid-crystal compound but a liquid crystal polymer compound can be used.

0037The cylindrical liquid crystal compound used for the present invention may be polymerization nature, or may be non-polymerizable. About the cylindrical liquid crystal compound which does not have a polymerization machine, various articles (for example, Y.*Goto*et.al., *Mol.*Cryst.*Liq.*Cryst.*1995, *Vol.*260, *pp.23-28) have a statement.<br />A polymerization cylindrical liquid crystal compound is obtained by introducing a polymerization machine into a cylindrical liquid crystal compound. An unsaturated polymerization machine, an epoxy group, and an aziridinyl machine are contained in the example of a polymerization machine, an unsaturated polymerization machine is preferred, and especially an ethylenic unsaturated polymerization machine is preferred. Polymerization machines are various methods and it can introduce them into the molecule of a cylindrical liquid crystal compound. The number of the polymerization machine which a polymerization cylindrical liquid crystal compound has is 1-6 pieces, more preferably 1-3 pieces preferably. The examples of a polymerization cylindrical liquid crystal compound are Makromol.Chem., 190 volumes, 2255 pages (1989), and Advanced**Materials**. Five volumes, 107 pages (1993), a U.S. Pat. No. 4683327 specification, The No. 5622648 specification, the No. 5770107 specification, international publication WO 95/No. 22586 gazette, The No. 95/24455 gazette, the No. 97/00600 gazette, the No. 98/23580 gazette, The compound of a statement is contained in the No. 98/52905 gazette, JP,1-272551,A, a 6-16616 gazette, a 7-110469 gazette, a 11-80081 gazette, JP,2001-328973,A, etc. Two or more kinds of polymerization cylindrical liquid crystal compounds may be used together. If two or more kinds of polymerization cylindrical liquid crystal compounds are used together, the temperature for Arrangement can be reduced.

0038(2) Optically active compound (chiral agent)<br />The above-mentioned liquid crystal constituent shows a cholesteric-liquid-crystal phase. For that purpose, it is preferred to contain an optically active compound. However, when the above-mentioned cylindrical liquid crystal compound is a molecule which has an inaccurate carbon atom, even if it does not add an optically active compound, a cholesteric-liquid-crystal phase may be able to be formed stably. The above-mentioned optically active compound can be chosen from publicly known various chiral agents (it indicates to the volume the chiral agent for for example, a liquid crystal device handbook, Chapter 3-4-3 paragraph, TN, and STN, 199 pages, and on 142nd committee of Japan Society for the Promotion of Science, and 1989). Although an optically active compound generally contains an asymmetric carbon atom, the axial asymmetrical compound or planar asymmetrical compound which does not contain an asymmetric carbon atom can also be used as a chiral agent. Binaphthyl, Helicen, Paracyclo fans, and these derivatives are contained in the example of an axial asymmetrical compound or a planar asymmetrical compound. The optically active compound (chiral agent) may have a polymerization machine. While an optically active compound has a polymerization machine, when the cylindrical liquid crystal compound used together also has a polymerization machine, The polymer which has a repeat unit guided from a cylindrical liquid crystal compound and a repeat unit guided from an optically active compound by the polymerization reaction of a polymerization optically active compound and polymerization cylindrical liquid crystal Composition can be formed. As for the polymerization machine which a polymerization optically active compound has, in this mode, it is preferred that they are a polymerization machine which a polymerization cylindrical liquid crystal compound has, and a basis of the same kind. Therefore, it is preferred that they are an unsaturated polymerization machine, an epoxy group, or an aziridinyl machine, it is still more preferred that it is an unsaturated polymerization machine, and, also as for the polymerization machine of an optically active compound, it is preferred that it is especially an ethylenic unsaturated polymerization machine.<br />An optically active compound may be a liquid crystal compound.

0039As for the optically active compound in the above-mentioned liquid crystal constituent, it is preferred that it is 1-30-mol % to the liquid crystal compound used together. The amount of the optically active compound used is liked in order that the direction lessened more may not affect liquid crystallinity in many cases. Therefore, the strong compound of the optically active compound used as a chiral agent which twists and is powerful is preferred so that a desired spiral pitch may be twisted and a small quantity can also attain those for Arrangement. As a chiral agent which shows such strong twist power, the chiral agent of a statement is mentioned to a JP,2003-287623,A gazette, and it can use for the present invention preferably, for example.

0040The infrared light light reflector of the present invention has the structure which the reverse light reflex layer adjoined mutually in the direction of a spiral of the cholesteric-liquid-crystal phase. The example with the larger refractive-index anisotropy of the light reflex layer from which 1 set of these adjoining light reflex layers turn into a lower layer as a desirable example of the present invention than the refractive-index anisotropy of the light reflex layer used as the upper layer is given. The refractive-index anisotropy of a layer is influenced by the refractive-index anisotropy of the liquid crystal material used as main materials, the amount of addition of a chiral agent added, etc. as described above. The market is provided with what [ than the chiral agent of anticlockwise rotation nature / more ] has strong twist power as a chiral agent of right wheel nature. Therefore, when forming the cholesteric-liquid-crystal phase of the same spiral pitch, the amount of addition of the chiral agent of right wheel nature can be made a small quantity [ amount / of addition / of the chiral agent of anticlockwise rotation nature ], and, as a result, refractive-index anisotropic deltan of a layer can be made low. Therefore, the width of selection of material of the mode which uses the constituent containing the chiral agent of right wheel nature as a liquid crystal constituent for formation of a downward light reflex layer, and uses the constituent containing the chiral agent of anticlockwise rotation nature as a liquid crystal constituent for formation of the light reflex layer of information is wide, and it is preferred.

0041(3) Polymerization initiator<br />As for the liquid crystal constituent used for formation of the above-mentioned light reflex layer, it is preferred that it is a polymerization liquid crystal constituent, and, for that purpose, it is preferred to contain the polymerization initiator. As for the polymerization initiator to be used, since a hardening reaction is advanced by an ultraviolet exposure in the present invention, it is preferred that it is a photopolymerization initiator which can start a polymerization reaction by an ultraviolet exposure. In the example of a photopolymerization initiator, it is alpha-carbonyl compound (U.S. Pat. No. 2367661). Each specification statement of the 2367670 No., reed loin ether (U.S. Pat. No. 2448828 specification statement), alpha-hydrocarbon substitution aromatic series acyloin compound (U.S. Pat. No. 2722512 specification statement), Polynuclear quinone compound (U.S. Pat. No. 3046127, each specification statement of the 2951758 No.), Combination of a triarylimidazole dimer and p-aminophenyl ketone (U.S. Pat. No. 3549367 specification statement), Acridine, a phenazine compound (JP,60-105667,A, U.S. Pat. No. 4239850 specification statement), an oxadiazole compound (U.S. Pat. No. 4212970 specification statement), etc. are mentioned.

0042As for the amount of the photopolymerization initiator used, it is preferred that it is 0.1 to 20 mass % of a liquid crystal constituent (it is the solid content in the case of coating liquid), and it is still more preferred that it is one to 8 mass %.

0043(4) The control agent for Arrangement<br />The control agent for Arrangement which contribute into the above-mentioned liquid crystal constituent becoming a cholesteric-liquid-crystal phase stably or quickly may be added. Fluorine-containing (meta) acrylate system polymer and the compound denoted by the following general formula (X1) (X3) - are contained in the example of the control agent for Arrangement. Two or more sorts chosen from these may be contained. These compounds can make reduction or a real target do for [ of the Tilt angle of the molecule of a liquid crystal compound ] level Arrangement in the air interface of a layer. It shall not demand to be strictly parallel although it says that "those for level Arrangement" has a liquid crystal molecule length axis and a parallel film surface on these specifications, and the angle of inclination with the level surface to make shall mean those of less than 20 degrees for Arrangement in this specification. Since it is hard to produce the defect for Arrangement when a liquid crystal compound carries out for level Arrangement near an air interface, the transparency in a light range becomes high, and the reflectance in an infrared region increases. It is not desirable in order for reflectance to fall since the screw axis of a cholesteric-liquid-crystal phase will shift from a film surface method line on the other hand if the molecule of a liquid crystal compound carries out for Arrangement on a big Tilt square, or to generate a fingerprints pattern and to show increase and diffractive. [ of Hayes ]<br />The example of the above-mentioned fluorine-containing (meta) acrylate system polymer which can be used as a control agent for Arrangement has a statement in [0018] - [0043] of JP,2007-272185,A, etc.

0044Hereinafter, the following general formula (X1) (X3) - which can be used as a control agent for Arrangement is explained in order.

0045<chemistry num="1"><img file="WO2010143684A1_D0001.tif" /></chemistry>

0046Inside of a formula, R^１R^２And R^３Each independence is achieved, a hydrogen atom or a substitution machine is expressed, and it is X.^１X^２And X^３The connection machine of Is a single bond or 2 values is expressed. R^１-R^３As a substitution machine with which it comes out and is expressed respectively, it is substitution or no replacing preferably, They are an amino group which is not replaced [ a Alkyl machine (especially, an unreplaced Alkyl machine or a fluoride substitution Alkyl machine is more preferred), an aryl group (the aryl group which has a fluoride substitution Alkyl machine especially is preferred), substitution, or ], an alkoxy group, an alkylthio group, and a halogen atom. X^１X^２And X^３The connection machines of the 2 values which come out and are expressed respectively are the Al Killen machine, an alkenylene group, the aromatic series machine of 2 values, the hetero Ring residue machine of 2 values, -CO-, -NRa- (the number of carbon atoms of Ra is the Alkyl machine or hydrogen atom of 1-5), -O-, -S-, -SO-, and -SO._２- And it is preferred that it is a connection machine of 2 values chosen from the group which consists of those combination. The connection machines of 2 values are the Al Killen machine, a phenylene group, -CO-, -NRa-, -O-, -S-, and -SO._２- from -- it is more preferred that it is a connection machine of the 2 values which combined at least two bases chosen from the connection machine or this group of 2 values chosen from the becoming group. As for the number of carbon atoms of the Al Killen machine, it is preferred that it is 1-12. As for the number of carbon atoms of an alkenylene group, it is preferred that it is 2-12. As for the number of carbon atoms of the aromatic series machine of 2 values, it is preferred that it is 6-10.

0047<chemistry num="2"><img file="WO2010143684A1_D0002.tif" /></chemistry>

0048R expresses a substitution machine among a formula and m expresses the integer of 0-5. When m expresses an integer greater than or equal to 2, two or more R may be the same, or may differ. A substitution machine desirable as R is R.^１R^２And R^３It is the same as that of what it came out of and was mentioned as a desirable range of a substitution machine expressed. m expresses the integer of 1-3 preferably, and, especially preferably is 2 or 3.

0049<chemistry num="3"><img file="WO2010143684A1_D0003.tif" /></chemistry>

0050Inside of a formula, R^４R^５R^６R^７R^８And R^９Each independence is achieved and a hydrogen atom or a substitution machine is expressed. R^４R^５R^６R^７R^８And R^９R [ in / the substitution machine with which it comes out and is expressed, respectively is preferred, and / general formula (XI) ]^１R^２And R^３It is the same as that of what it came out of and was mentioned as a desirable thing of a substitution machine expressed.

0051The compound of a statement is contained in the example of a compound denoted by the above-mentioned formula (X1) (X3) - usable as a control agent for Arrangement in the present invention at JP,2005-99248,A.<br />In the present invention, a kind of a compound denoted by the above-mentioned general formula (X1) (X3) - may be independently used as a control agent for Arrangement, and two or more sorts may be used together.

0052The amount of addition of the compound denoted by the general formula (X1) in the above-mentioned liquid crystal constituent and either - (X3) has 0.01 of the mass of a liquid crystal compound - preferred 10 mass %, its 0.01 - 5 mass % is more preferred, and especially its 0.02 - 1 mass % is preferred.

00532. Substrate<br />Although the infrared light light reflector of the present invention has a substrate, the substrate concerned has free-standing, and if the above-mentioned light reflex layer is supported, there will be no limitation in any way about material and the optical characteristic. Depending on the use, the high transparency over purple outdoor daylight will be required. A production process is managed and it is manufactured so that the predetermined optical characteristic may be satisfied, It may be special retardation films, such as lambda/2 board, and the variation in the retardation within a field is in a concrete target greatly, As long as it expresses with the variation in retardation Re (1000) with a wavelength of 1000 nm within a field, the variations in Re (1000) may be 20 nm or more and 100 nm or more, and it may be a polymer film unusable as a predetermined retardation film etc. There is no restriction in particular also about the retardation within a field of a substrate, for example, retardation Re (1000) with a wavelength of 1000 nm within a field can use the retardation film etc. which are 800-13000 nm.

0054As a polymer film with high permeability over visible light, the polymer film for various optical films used as a member of displays, such as a liquid crystal display, is mentioned. As the above-mentioned substrate, it is polyethylene terephthalate (PET), for example, Polyester films, such as poly butylene terephthalate and polyethylenenaphthalate (PEN); a polycarbonate (PC) film, polymethyl methacrylate film; -- polyolefin film; polyimide films, such as polyethylene and polypropylene, and doria -- a Cetyl cellulose (TAC) film etc. are mentioned.

00553. Manufacturing Method of Infrared Light Light Reflector<br />As for the infrared light light reflector of the present invention, being produced by a coating method is preferred. An example of a manufacturing method,<br />(1) Apply the liquid crystal constituent of hardenability to the surfaces, such as a substrate, and change into the state of a cholesteric-liquid-crystal phase,<br />(2) The liquid crystal constituent of the above-mentioned hardenability is irradiated with ultraviolet rays, advance a hardening reaction, fix a cholesteric-liquid-crystal phase, and form a light reflex layer,<br />Even if small, it is an included manufacturing method.<br />(1) And the infrared light light reflector of the composition shown in Drawing 1 and the same composition is producible by repeating the process of (2) 4 times on one surface of a substrate. The infrared light light reflector of the composition shown in Drawing 2 and the same composition is producible by repeating the process of (1) and (2) 4 times on one surface of a substrate, and repeating it twice on the surface of another side of a substrate after that or simultaneous before that.

0056In the above-mentioned (1) process, the above-mentioned hardenability liquid crystal constituent is first applied to the surface of a substrate or a lower layer light reflex layer. As for the liquid crystal constituent of the above-mentioned hardenability, it is preferred to be prepared as coating liquid which dissolved and/or distributed material to the solvent. The application of the above-mentioned coating liquid can be performed by various methods, such as a wire bar coating method, an extrusion coating method, the direct gravure coating method, the reverse gravure coating method, and the die coating method. Using an ink jet device, a liquid crystal constituent can be breathed out from a nozzle and a coat can also be formed.

0057Next, it is applied to the surface and the hardenability liquid crystal constituent used as a coat is changed into the state of a cholesteric-liquid-crystal phase. In the mode currently prepared as coating liquid containing a solvent, the above-mentioned hardenability liquid crystal constituent may be able to dry a coat, and may be able to change into the state of a cholesteric-liquid-crystal phase by removing a solvent. In order to consider it as the transition temperature to a cholesteric-liquid-crystal phase, the above-mentioned coat may be heated by request. For example, it once heats to temperature of an isotropic phase. Then, it can change into a state of a cholesteric-liquid-crystal phase stably by cooling to cholesteric liquid crystal phase transition temperature etc. As for the liquid crystal phase transition temperature of the above-mentioned hardenability liquid crystal constituent, it is preferred that it is within the limits of 10-250 from fields, such as manufacture aptitude, and it is more preferred that it is within the limits which is 10-150 . A cooling process etc. may be needed in order to lower temperature even to the temperature range which presents a liquid crystal phase, if it is less than 10 . If it exceeds 200 , in order to use a further hot isotropic liquid state rather than the temperature range which once presents a liquid crystal phase, high temperature will be required, and it will become disadvantageous also from waste of thermal energy, modification of a substrate, deterioration, etc.

0058Next, in the process of (2), the coat which changed into the state of a cholesteric-liquid-crystal phase is irradiated with ultraviolet rays, and a hardening reaction is advanced. Light sources, such as an ultraviolet-rays lamp, are used for an ultraviolet exposure. In this process, by irradiating with ultraviolet rays, the hardening reaction of the above-mentioned liquid crystal constituent advances, a cholesteric-liquid-crystal phase is fixed, and a light reflex layer is formed.<br />Although there is no restriction in particular about the irradiation amount of energy of ultraviolet rays, generally it is 100 mJ/cm.^２- 800 mJ/cm^２A grade is preferred. Although there is no restriction in particular about time to irradiate the above-mentioned coat with ultraviolet rays, it will be determined from a viewpoint of the both sides of sufficient intensity of a hardening film, and productivity.

0059In order to promote a hardening reaction, an ultraviolet exposure may be carried out under heating conditions. As for the temperature at the time of an ultraviolet exposure, it is preferred to maintain in the temperature range which presents a cholesteric-liquid-crystal phase so that a cholesteric-liquid-crystal phase may not be confused. In order that it may participate in a degree of polymerization, it cannot be given to a desired degree of polymerization in the air, but when film strength is insufficient, it is preferred [ the oxygen concentration of atmosphere ] to reduce the oxygen concentration in atmosphere by methods, such as replacement by nitrogen gas. As desirable oxygen concentration, 10% or less is preferred, 7% or less is still more preferred, and 3% or less is the most preferred. As for the reaction rate of the hardening reaction (for example, polymerization reaction) which advances by an ultraviolet exposure, it is preferred from viewpoints of stopping that maintenance etc. and the unreacted material of the mechanical strength of a layer flow out of a layer that it is 70% or more, it is more preferred that it is 80% or more, and it is still more preferred that it is 90% or more. In order to raise a reaction rate, the polymerization under the method of increasing the amount of irradiation of the ultraviolet rays with which it irradiates, a nitrogen atmosphere, or heating conditions is effective. After making it once polymerize, the method of holding by a high temperature condition and further promoting a reaction by a thermal polymerization reaction rather than polymerization temperature, and the method (however, it glares on the conditions with which it is satisfied of the conditions of the present invention) of irradiating with ultraviolet rays again can also be used. Measurement of a reaction rate can be performed by measuring the absorption intensity of the infrared vibration spectrum of a reactant machine (for example, polymerization machine) before and after reaction advance.

0060In the above-mentioned process, a cholesteric-liquid-crystal phase is fixed and a light reflex layer is formed. Here, the state where the liquid crystal phase "was fixed" is a mode most typical [ the state where those of the liquid crystal compound used as a cholesteric-liquid-crystal phase for Arrangement were held ], and desirable. It is not limited only to it but, specifically, usually sets in the temperature range of -30 - 70 under 0 - 50 , and severer conditions, The state where keeping the form for fixed Arrangement stable can be continued without there being no mobility in this layer, and making the form for Arrangement produce change by an outer field or external force shall be meant. In the present invention, the state for Arrangement of a cholesteric-liquid-crystal phase is fixed by the hardening reaction which advances by an ultraviolet exposure.<br />In the present invention, if the optical property of the cholesteric-liquid-crystal phase is kept in the layer, it is enough and, finally the liquid crystal constituent in a light reflex layer does not need to show liquid crystallinity any longer. For example, the liquid crystal constituent could carry out polymers quantification by a hardening reaction, and may already lose liquid crystallinity.

00614. Use of Infrared Light Light Reflector<br />The infrared light light reflector of the present invention shows the selective reflection characteristic which has a reflective peak in the wavelength of 700 nm or more (preferably 800-1300 nm). The light reflector of such the characteristic is stuck on the window of vehicles, such as buildings, such as a residence and an office building, or a car, as a member for thermal insulation of Japanese Shoot. Or the use can be presented with the infrared light light reflector of the present invention as the member for thermal insulation of Japanese Shoot (for example, the glass for thermal insulation, the film for thermal insulation) itself.

0062The infrared light light reflector of the present invention can attain 90% or more of the maximum reflectance of Japanese Shoot in the wavelength of 800-1300 nm, and it is most preferred that it is 100%, of course. Especially the infrared light light reflector of the present invention is excellent in the feature, i.e., thermal insulation nature, of excelling in reflectance with a wavelength of 900 nm - about 1300 nm which contributes to rises in heat, such as in the car, greatly in the building.<br />Other important performances are the transmissivity of visible light, and Hayes as an infrared light light reflector. Selection, manufacturing conditions, etc. of material are adjusted and the infrared light light reflector which shows the transmissivity of desirable visible light and Hayes can be provided according to a use. For example, in the mode used for a use with high transmissivity of visible light, the transmissivity of visible light is 90% or more, and infrared reflectance can consider it as the infrared light light reflector which satisfies the above-mentioned reaction.

0063<u style="single">The 2nd present invention</u><br />The 2nd present invention has a cholesteric liquid crystal layer inside, and contributes to an improvement of the lightfastness of glass. In the 2nd invention, a "cholesteric liquid crystal layer" will be in the state of not only the layer that fixes a "cholesteric-liquid-crystal phase" but a "cholesteric-liquid-crystal phase" at least, and it will use it in the meaning containing the layer which may be transferred to other liquid crystal phases by a temperature change etc.<br />Hereinafter, the 2nd present invention is explained in detail.

0064The 2nd present invention is related on a substrate, and the surface and/or the back at the layered product which has at least a cholesteric liquid crystal layer more than one layer or two-layer, and an easy-bonding layer which contains polyvinyl butyral resin as the outermost layer of at least 1 side. It unites, and glass carries out heat adhesion of the middle film formed in the inside of two glass boards, and, generally, is produced. Although heat adhesion of the surface of a cholesteric liquid crystal layer will be carried out with a middle film when putting this layered product that unites and has a cholesteric liquid crystal layer more than one layer or two-layer inside glass, If it is put to available light for a long time and temperature rises since such adhesion power is insufficient, air bubbles will be generated between a cholesteric liquid crystal layer and a middle film, and transparency will fall to it. Since the layered product of the present invention has an easy-bonding layer in the outermost layer, when putting into a glass board, heat adhesion of the surface of the easy-bonding layer concerned may be carried out with a middle film, adhesion power is improved, and lightfastness is improved by extension.

0065As the outermost layer of the both sides of the surface and the back, the layered product of the present invention may have an easy-bonding layer, may have the above-mentioned easy-bonding layer as the surface outermost layer, and may have an undercoat layer as the outermost layer on the back. The cross section of an example of the former mode is shown in Drawing 5, and the cross section of an example of the latter mode is shown in Drawing 6. As the outermost layer of the both sides of the surface of member 22 and the back where layered product 20 shown in Drawing 5 has a cholesteric liquid crystal layer more than one layer or two-layer, As the outermost layer of the surface of member 22 which has a cholesteric liquid crystal layer more than one layer or two-layer, layered product 20' which has easy-bonding layer 24 and is shown in Drawing 6 has easy-bonding layer 24, and has undercoat layer 26 as the outermost layer of the back of member 22.

0066In the mode in which member 22 which has a cholesteric liquid crystal layer has a cholesteric liquid crystal layer of one or more layers only on one surface of a substrate, for example like the infrared light light reflector shown in Drawing 1, It is preferred to form easy-bonding layer 24 in the surface of the cholesteric liquid crystal layer (Drawing 1 light reflex layer 16b) which is the top layer, and to form easy-bonding layer 24 or undercoat layer 26 in the back of the substrate (Drawing 1 substrate 12) consisting of a polymer film etc. In the mode in which member 22 which has a cholesteric liquid crystal layer has a cholesteric liquid crystal layer of one or more layers to the both sides of the surface of a substrate, and the back, for example like the infrared light light reflector shown in Drawing 2, It is preferred to form easy-bonding layer 24 in the surface of the cholesteric liquid crystal layer (Drawing 2 light reflex layer 16b) which is the top layer, and to form easy-bonding layer 24 also in the surface of the cholesteric liquid crystal layer (Drawing 2 light reflex layer 18b) which is the bottom of the heap.

0067It has a layered product shown in Drawing 5 and Drawing 6 inside, and the cross section of an example of glass is shown in Drawing 7 and Drawing 8. It is shown in Drawing 7, and heat adhesion of the glass 30 can be carried out, and it can manufacture easy-bonding layer 24 of the upper and lower sides of layered product 20 shown in Drawing 5, and middle film 27 formed in the inside of up-and-down glass board 28. Heat adhesion can be carried out and middle film 27 which glass 30' carried out heat adhesion of easy-bonding layer 24 of layered product 20' shown in Drawing 6 and the middle film 27 formed in the inside of glass board 28 by being shown in Drawing 8, and was formed in undercoat layer 26 of layered product 20' and the inside of glass board 28 can be manufactured.

0068It is shown in Drawing 7 and Drawing 8, and glass 30 and 30' have various functions by choosing layered product 20 and 20' which were put between the inside. For example, by choosing the layered product which used the cholesteric liquid crystal layer as a light reflex layer as shown in Drawing 1 and Drawing 2, it has the reflective characteristic to the light of the predetermined wavelength range, and becomes optical reflexibility Together glass.

0069It is shown in Drawing 7 and Drawing 8, and glass 30 and 30' turn to the outdoors the surface of glass board 28 which is one side, for example, turn the surface of glass board 28 of another side indoors, and are arranged. Some cholesteric liquid crystal layers deteriorate and turn yellow by irradiation of ultraviolet rays. Since it can control that a cholesteric liquid crystal layer turns yellow that easy-bonding layer 24 is ultraviolet absorbability by the ultraviolet rays from the outdoors and lightfastness is improved more, it is desirable. For example, when Drawing 7 and Drawing 8 unite, and turning glass board 28 of the upper part in a figure to the outdoors and arranging glass 30 and 30', it is preferred to add an ultraviolet ray absorbent to easy-bonding layer 24 (in Drawing 7, it is upper easy-bonding layer 24) to make ultraviolet absorbability. It is with an easy-bonding layer and a middle film (in Drawing 7 and Drawing 8, it is middle film 27 of upper easy-bonding layer 24 and the upper part), and since yellowing by ultraviolet rays is markedly mitigable if there is an operation which makes transmissivity of ultraviolet rays with a wavelength of 380 nm or less 0.1% or less, it is desirable.

0070Next, the 2nd layered product, various materials which unite and are used for production of glass, and method of the present invention are explained in detail.<br />1. Easy-bonding Layer<br />The layered product of the 2nd present invention has an easy-bonding layer containing polyvinyl butyral resin as at least one outermost layer. Polyvinyl butyral resin is a kind of polyvinyl acetal which butylaldehyde is made to react to polyvinyl alcohol by an acid catalyst, and is generated. It is resin which has a repeat unit of the following structure.

0071<chemistry num="4"><img file="WO2010143684A1_D0004.tif" /></chemistry>

0072As for the above-mentioned easy-bonding layer, forming by application is preferred. For example, it may form in the surface of a cholesteric liquid crystal layer by application. One sort of polyvinyl butyral resin can be dissolved in an organic solvent, and coating liquid can more specifically be prepared, and the coating liquid can be applied to the surfaces, such as a cholesteric liquid crystal layer, can be heated by request, and it can dry, and can form an easy-bonding layer. As a solvent used for manufacture of coating liquid, methoxy propyl acetate (PGMEA), methyl ethyl ketone (MEK), isopropanol (IPA), etc. can be used, for example. As a coating method, publicly known various methods can be used conventionally. Although the temperature at the time of dryness differs in the desirable range by the material used for manufacture of coating liquid, generally, it is preferred that it is about 140-160 . Although there is no restriction in particular also about drying time, generally it is about 5 to 10 minutes.

0073In an easy-bonding layer, it is preferred to add an ultraviolet ray absorbent as described above. It is preferred to add in the easy-bonding layer arranged between the glass board arranged especially at the outdoors side and a cholesteric liquid crystal layer. Ultraviolet ray absorbent; titanium oxide, such as a benzotriazole series, a benzodithiol series, a coumarin series, a benzophenone series, an ester salicylate system, and a cyanoacrylate system, a zinc oxide, etc. are mentioned as the example of an usable ultraviolet ray absorbent. Tinuvin326,328,479 (all are made in Chiba Japan) etc. is especially contained in the example of the desirable above-mentioned ultraviolet ray absorbent. Although the kind of the above-mentioned ultraviolet ray absorbent and loadings do not have restriction in particular and it can choose suitably according to the object, since yellowing by ultraviolet rays is markedly mitigable if there is an operation for which an easy-bonding layer makes transmissivity of ultraviolet rays with a wavelength of 380 nm or less 0.1% or less, it is desirable. Therefore, it is preferred to determine the kind and loadings of an ultraviolet ray absorbent so that this characteristic may be satisfied.

00742. Undercoat Layer<br />The 2nd layered product of the present invention may have an undercoat layer, in order to improve adhesiveness with the middle film formed in the inside of glass. An undercoat layer is a layer which an acrylic resin, urethane resin, polyester resin, etc. contain.<br />For example, when uniting the layered product which has a cholesteric liquid crystal layer more than one layer or two-layer and putting it into glass only on one surface of polymer films, such as a PET film, heat adhesion of the middle film of the back of a polymer film and the inside of glass will be carried out. Depending on the material of the poly murmur film, there is what has insufficient adhesiveness with a middle film, and it can improve adhesiveness by forming an undercoat layer. Generally, an undercoat layer is formed by application. Since the undercoat layer is given to some polymer films marketed, those commercial items can also be used as a substrate.

0075Although there is no restriction in particular about the thickness of the above-mentioned undercoat layer, generally it is preferred that it is about 0.1-2.0 micrometers.

00763. Unite and it is Glass.<br />Two glass boards which are set and are used for production of glass have a middle film on the surface, and are glass boards for glass, respectively. A general thing can be used. Generally, a middle film contains polyvinyl butyral resin (PVB) or an ethylene-vinyl acetate copolymer (EVA) as main materials. The above-mentioned easy-bonding layer has good adhesiveness also to the middle film which uses which material as the main materials. It excels in heat adhesiveness with the middle film which uses polyvinyl butyral resin as the main materials especially.

0077There is no restriction in particular about the thickness of a glass board, and it changes the desirable range according to a use. For example, it is preferred to generally use a 2.0-2.3-mm-thick glass board in the use of the windshield (window shield) of transportation vehicles. Generally, the thickness of a middle film is about 380-760 micrometers.

<p num="0078">An example and a comparative example are given to below and the feature of the present invention is explained to it still more concretely. Material, the amount used, a rate, the contents of processing, a processing procedure, etc. which are shown in the following examples can be suitably changed, unless it deviates from the meaning of the present invention. Therefore, the range of the present invention should not be restrictively interpreted by the example shown below.</p><p num="0079">1. Example of 1st Invention<br />The coating liquid (A) of the composition shown in the following table, (B), (C), and (D) were prepared, respectively.</p><p num="0080"><tables num="1"><img file="WO2010143684A1_D0005.tif" /></tables></p><p num="0081"><tables num="2"><img file="WO2010143684A1_D0006.tif" /></tables></p><p num="0082"><tables num="3"><img file="WO2010143684A1_D0007.tif" /></tables></p><p num="0083"><tables num="4"><img file="WO2010143684A1_D0008.tif" /></tables></p><p num="0084"><chemistry num="5"><img file="WO2010143684A1_D0009.tif" /></chemistry></p><p num="0085"><chemistry num="6"><img file="WO2010143684A1_D0010.tif" /></chemistry></p><p num="0086">(1) Using the wire bar, each prepared coating liquid was applied at room temperature on the PET film by Fuji Photo Film Co., Ltd. so that the thickness of the dry film after dryness might be set to 6 micrometers.<br />(2) After making it dry for 30 seconds at room temperature to make a cholesteric-liquid-crystal phase, It heated for 2 minutes in 125 atmosphere, and after that, at 95 , by D valve made from a fusion (lamp 90 mW/cm), UV irradiation during 6 to 12 seconds was carried out with 60% of the output, the cholesteric-liquid-crystal phase was fixed, and the film (light reflex layer) was produced.<br />(3) After cooling to room temperature, the above-mentioned process (1) and (2) was repeated.</p><p num="0087">With the described method, the infrared light light reflector shown in the following table was produced, respectively.<br />The interception performance reflected to a 900-1300-nm Japanese Shoot spectrum about each produced light reflector using a spectrum photometer was evaluated.<br />About thermal insulation nature, the reflectance of 900-1300 nm estimated 75% or more of thing as A (O), estimated 70% or more of thing as right () less than 75%, and estimated less than 70% of thing as Inferiority (x).</p><p num="0088"><tables num="5"><img file="WO2010143684A1_D0011.tif" /></tables></p><p num="0089">In the manufacturing method of Example 1, by adjusting the maturing time for adjusting the film temperature at the time of UV irradiation in the above-mentioned process (2) among 25-100 , and Arrangement, the screw-axis angle (order for Arrangement) was adjusted, and the following infrared light light reflector (reference example 1) was produced.<br />Reflectance and thermal insulation nature were evaluated like the above. The evaluation result of the infrared light light reflector of reference example 1 is shown in the following table with the evaluation result of the infrared light light reflector of Example 1.</p><p num="0090"><tables num="6"><img file="WO2010143684A1_D0012.tif" /></tables></p><p num="0091">Although light reflex layers X1 and X2 whose main reflective wavelengths are 1000 nm are arranged near the substrate side like [ reference example 1 ] Example 1 as shown in the above-mentioned table, Since the degree for Arrangement of light reflex layers X1 and X2 of order was smaller than the degree for Arrangement of light reflex layers X3 and X4 of order, reflectance fell to 70% and thermal insulation nature was inferior as compared with Example 1.</p><p num="0092">2. Example of 2nd Invention<br />(1) Example 11<br />As a substrate, the 188-micrometer-thick polyethylene terephthalate film (henceforth "a PET film") was prepared. This PET film is the Fuji Photo Film brand name "FPA14-188", and had an undercoat layer which becomes both sides from urethane resin and an acrylic resin.<br />The coating liquid (A) used in the above-mentioned example was applied, it dried, and one side of this substrate was stiffened and the cholesteric liquid crystal layer was formed in it.</p><p num="0093">Next, coating liquid 1 for easy-bonding layers of the following composition was prepared. On the surface of the cholesteric liquid crystal layer, the bar application was carried out so that dry film thickness might be set to 2 micrometers, this coating liquid was dried for 7 minutes at the temperature of 150 , and the easy-bonding layer was formed. Thus, layered product 11 which has an easy-bonding layer was produced.<br />- Coating liquid 1 for easy-bonding layers<br />Methoxy propyl acetate (PGMEA) 100 mass parts<br />Polyvinyl butyral resin<br />(B1776 Made in Taiwan Changchun, Inc.) 10 mass parts</p><p num="0094">Next, it is 2-mm-thick clear glass (made by Nippon Sheet Glass Co., Ltd.), and prepares two glass boards which have a PVB middle film (15 mil (1 mil = 1/1000 inch = 0.0254 mm)) on the surface, The PVB middle film was carried out inside and has been arranged, and between them, inserted the above-mentioned layered product 11, and it was made to paste up by heat-treatment, united, and produced glass.</p><p num="0095">(2) Example 12<br />Coating liquid 2 for easy-bonding layers of the following composition was prepared.<br />- Coating liquid 2 for easy-bonding layers<br />Methoxy propyl acetate (PGMEA) 100 mass parts<br />Ultraviolet ray absorbent (Tinuvin326, made in Chiba Japan) 2.5 mass parts<br />HALS (Tinuvin152, made in Chiba Japan) 2.5 mass parts<br />Polyvinyl butyral resin<br />(B1776 Made in Taiwan Changchun, Inc.) 10 mass parts</p><p num="0096">Layered product 12 which has an easy-bonding layer was produced like Example 11 except having replaced coating liquid 1 used in Example 11 with coating liquid 2 prepared above, and having formed the easy-bonding layer. Except having replaced layered product 11 with layered product 12, similarly, it united and produced glass.</p><p num="0097">(3) Comparative example 11<br />Except not having formed an easy-bonding layer, it united like Example 11 and produced glass.<br />(4) Comparative example 12<br />It carried out inside and has arranged, and between them, no PVB middle films were inserted, but were set [ it is 2-mm-thick clear glass (made by Nippon Sheet Glass Co., Ltd.), and two glass boards which have a PVB middle film (15 mil) on the surface were prepared, ], and glass was produced.</p><p num="0098">(5) A light-fast examination<br />The light-fast examination was done on condition of the following, and each Together glass produced above was evaluated by the viewpoint of the existence of generating of air bubbles, and the grade of yellow discoloration.<br />- A light-fast test condition<br />Device : Iwasaki electrical machinery Eye super UV (metal halide)<br />BP temperature : 63 <br />Irradiation side : It is exposed from the easy-bonding layer side and cholesteric liquid crystal layer side.<br />Irradiation time : it evaluates after 200-hour irradiation.<br />A result is shown in the following table.</p><p num="0099"><tables num="7"><img file="WO2010143684A1_D0013.tif" /></tables></p>

010010 and 10' infrared light light reflector (infrared light light reflector of the 1st present invention)<br />12 Substrate<br />14a Light reflex layer (light reflex layer X1)<br />14b Light reflex layer (light reflex layer X2)<br />16a Light reflex layer (light reflex layer X3)<br />16b Light reflex layer (light reflex layer X4)<br />18a Light reflex layer<br />18b Light reflex layer<br />20 and 20' layered product (layered product of the 2nd present invention)<br />The member which has a 22 and 22' cholesteric liquid crystal layer<br />24 Easy-bonding Layer<br />26 Undercoat Layer<br />27 Middle Film<br />28 Glass Board<br />30 and 30' -- uniting -- glass