Photocatalyst-containing composition and photocatalyst-containing layer

The present invention relates to a photocatalyst-containing composition that can be used for various purposes such as a filter and the like.

Conventionally, photocatalysts such as titanium oxide have been used for various purposes due to their antibacterial action, antifouling action, deodorant action, etc. (for example, Patent Document 1 etc.). In these applications, the photocatalyst is excited by energy such as ultraviolet light and affects nearby organic substances to exert various functions. Therefore, in a place where there is little ultraviolet light or the like, there are cases where the function of such a photocatalyst cannot be fully exerted.<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2003-261330</text></patcit>

<p> Therefore, it is desired to provide a photocatalyst-containing composition which has good photocatalyst sensitivity and can be used for various purposes.</p>

<p> The present invention provides a photocatalyst-containing composition comprising a photocatalyst and silver oxide.</p><p> According to the present invention, since silver oxide is contained in the photocatalyst-containing composition, the sensitivity of the photocatalyst can be improved, and the effect of the photocatalyst can be exerted even with a weak energy. It can be a photocatalyst-containing composition that can be used in the above applications. Further, in the present invention, the color of the photocatalyst-containing composition can be changed by irradiating the photocatalyst-containing composition with energy, and the photocatalyst-containing composition whose color has changed can be heated or for a certain period of time. It is possible to restore the color by leaving it unattended. Therefore, this color change can also be used for various purposes.</p><p> When the number of atoms of the metal of the photocatalyst contained in the photocatalyst-containing composition is 1, the number of silver atoms of the silver oxide is preferably in the range of 0.001 to 0.5. This is because the inclusion of the silver oxide within such a range makes it possible to activate the photocatalyst and change the color.</p><p> Further, in the above invention, it is preferable that the photocatalyst is titanium oxide. This is because titanium oxide is easily available among the commonly used photocatalysts, and is stable and non-toxic.</p><p> The present invention also provides photocatalyst-containing fine particles containing the above photocatalyst-containing composition. According to the present invention, since the photocatalyst-containing composition is contained in the fine particles, it can be easily mixed with other substances and used to exert the effect of the photocatalyst-containing composition. Further, since the surface area of the photocatalyst can be increased, there is an advantage that the effect of the photocatalyst can be increased.</p><p> The present invention also provides a filter and an antibacterial agent, which are characterized by containing the photocatalyst-containing fine particles. According to the present invention, since the sensitivity of the photocatalyst is considered to be good, it is possible to sufficiently exert the effect even in a place where energy is low such as ultraviolet light.</p><p> The present invention also provides a photocatalyst-containing layer containing the above photocatalyst-containing composition. According to the present invention, since the photocatalyst-containing composition is contained, it is possible to change the color of the layer, decompose organic substances, and the like by irradiating the photocatalyst-containing layer with energy such as ultraviolet rays. , It can be a photocatalyst-containing layer that can be used for various purposes.</p><p> The present invention also provides a patterning substrate having the photocatalyst-containing layer. According to the present invention, for example, a characteristic change layer that is decomposed or modified by the action of a photocatalyst accompanying energy irradiation is formed on the photocatalyst-containing layer, and a pattern in which the characteristics of the characteristic change layer is changed only in the energy-irradiated portion is formed. It can be a patterning substrate or the like.</p><p> The present invention also provides a method for producing a photocatalyst-containing composition, which comprises adding a silver colloid to a photocatalyst to produce a photocatalyst-containing composition containing the photocatalyst and silver oxide.</p><p> According to the present invention, by mixing the photocatalyst and the silver colloid, the silver particles are changed to silver oxide by the action of the photocatalyst to be in a stable state, and the photocatalyst-containing composition can be obtained. is there.</p>

<p> According to the present invention, since the effect of the photocatalyst can be exerted even with weak energy, a photocatalyst-containing composition that can be used for various purposes can be obtained. Further, the present invention has an advantage that a photocatalyst-containing composition that can be used for various purposes can be obtained by utilizing the change in color.</p>

The present invention relates to a photocatalyst-containing composition that can be used for various purposes including a filter, a photocatalyst-containing fine particle containing the photocatalyst-containing composition, a photocatalyst-containing layer, and the like, and a method for producing the photocatalyst-containing composition. It is a thing. Hereinafter, each will be described separately.

A. Photocatalyst-containing composition First, the photocatalyst-containing composition of the present invention will be described. The photocatalyst-containing composition of the present invention is characterized by containing a photocatalyst and silver oxide.

According to the present invention, since the silver oxide is contained together with the photocatalyst, the sensitivity of the photocatalyst to the energy for exciting the photocatalyst can be improved by the action of the silver oxide, for example, weak energy. Even when irradiated with, various photocatalytic actions such as antibacterial action and antifouling action can be exerted.

Further, when the photocatalyst-containing composition of the present invention is irradiated with energy such as ultraviolet light, silver oxide is reduced by the action of the photocatalyst to become silver, and the color changes. Therefore, according to the present invention, it is possible to obtain a patterning substrate or the like that can be easily aligned by utilizing the change in color of the photocatalyst-containing composition.

The mechanism by which silver oxide contributes to the sensitivity of the photocatalyst described above is not always clear, but when the photocatalyst is excited by energy irradiation, silver ions act as electron acceptors and the reaction by the photocatalyst is promoted. It is thought that it will be done.

The content ratio of the photocatalyst to silver oxide contained in the photocatalyst-containing composition in the present invention is such that the silver of the silver oxide has an atomic number of 0.001 to 0.5 when the number of atoms of the metal of the photocatalyst is 1. It is preferable that the content is within the range of 0.005 to 0.2, particularly preferably within the range of 0.01 to 0.1. This is because silver oxide can improve the sensitivity of the photocatalyst, change the color of the photocatalyst-containing composition, and the like. Further, in the present invention, the photocatalyst-containing composition may contain a material other than the photocatalyst and silver oxide. Hereinafter, each material used in the photocatalyst-containing composition of the present invention will be described in detail.

(Silver Oxide) First, silver oxide used in the present invention will be described. As the silver oxide used in the present invention, silver oxide that is generally used can be used, and the amount contained in the photocatalyst-containing composition is appropriately selected depending on the purpose of the photocatalyst-containing composition and the like. However, it can be usually contained in the solid content of the photocatalyst-containing composition in the range of 0.1% by weight to 50% by weight, particularly in the range of 1% by weight to 35% by weight.

Further, silver oxide usually exists in the state of fine particles and is appropriately selected depending on the state and type of the photocatalyst-containing composition, but its average particle size is about 1 μm to 100 μm, especially about 1 μm to 50 μm. Is preferable.

Here, in the present invention, the silver oxide may be mixed with a photocatalyst or the like described later in the state of silver oxide, but in the present invention, the silver oxide is particularly mixed with the photocatalyst in the state of silver. Is preferable. This is because silver oxide is usually easily decomposed by light, heat, or the like and has low stability. Therefore, it is easier to produce a photocatalyst-containing composition when silver oxide is produced by the action of a photocatalyst.

The method for adding silver is not particularly limited as long as it is uniformly dispersed with a photocatalyst or the like described later and is converted to silver oxide by the action of the photocatalyst, but it is added as a silver colloid. It is preferable that it is a thing. This is because the dispersion stability of silver oxide can be improved in the photocatalyst-containing composition. When silver is added as the silver colloid, an organic component may be attached to the surface of silver, or the surface may be coated with an organic component.

(Photocatalyst) Next, the photocatalyst used in the present invention will be described. The photocatalyst used in the present invention is not particularly limited as long as it is excited by energy irradiation and can exhibit various functions such as antibacterial action and antifouling action. .. The mechanism of action of a photocatalyst typified by titanium dioxide as described later is not always clear, but carriers generated by irradiation with light react directly with nearby compounds, or in the presence of oxygen and water. It is believed that the generated reactive oxygen species change the chemical structure of organic matter. In the present invention, it is considered that this carrier acts on organic substances such as bacteria and dirt.

The photocatalyst used in the present invention includes, for example, titanium dioxide (TiO) known as a photosemiconductor.₂), Zinc oxide (ZnO), Tin oxide (SnO)₂), Strontium titanate (SrTiO)₃), Tungsten trioxide (WO₃), Bismuth oxide (Bi₂O₃), And iron oxide (Fe)₂O₃), And one or a mixture of two or more can be used by selecting from these.

In the present invention, titanium dioxide is particularly preferably used because it has a high bandgap energy, is chemically stable, is not toxic, and is easily available. Titanium dioxide includes anatase type and rutile type, both of which can be used in the present invention, but anatase type titanium dioxide is preferable. The anatase-type titanium dioxide has an excitation wavelength of 380 nm or less.

Examples of such anatase-type titanium dioxide include hydrochloric acid-freezing-type anatase-type titaniasol (STS-02 (average particle size 7 nm) manufactured by Ishihara Sangyo Co., Ltd., ST-K01 manufactured by Ishihara Sangyo Co., Ltd.), and nitrate solution. Glue-type anatase-type titania sol (TA-15 manufactured by Nissan Chemical Co., Ltd. (average particle size 12 nm)) and the like can be mentioned.

The smaller the particle size of the photocatalyst, the more effectively the photocatalytic reaction occurs. Therefore, the average particle size is preferably 50 nm or less, and it is particularly preferable to use a photocatalyst of 20 nm or less.

Further, as the titanium oxide, a visible light responsive type may be used. The visible light responsive titanium oxide is also excited by the energy of visible light, and examples of such a visible light responsive method include a method of nitriding titanium oxide.

Titanium oxide (TiO₂) Is titanium oxide (TiO) by nitriding.₂), A new energy level is formed inside the bandgap, narrowing the bandgap. As a result, it is usually titanium oxide (TiO₂) Has an excitation wavelength of 380 nm, but it can also be excited by visible light having a wavelength longer than that excitation wavelength. As a result, the wavelength of the visible light region of energy irradiation by various light sources is also titanium oxide (TiO).₂), It is possible to further increase the sensitivity of titanium oxide.

Here, the nitriding treatment of titanium oxide referred to in the present invention is titanium oxide (TiO).₂) Crystals are partially replaced with nitrogen atoms, and titanium oxide (TiO)₂) Doping nitrogen atoms between crystal lattices, or titanium oxide (TiO)₂) Refers to the process of arranging nitrogen atoms at the grain boundaries of polycrystalline aggregates of crystals.

Titanium oxide (TiO₂The nitriding treatment method of) is not particularly limited. For example, fine particles of crystalline titanium oxide are doped with nitrogen by heat treatment at 700 ° C. in an ammonia atmosphere, and the nitrogen-doped fine particles and inorganic particles are doped with nitrogen. Examples thereof include a method of preparing a dispersion using a binder, a solvent, or the like.

Such a photocatalyst is preferably contained in the solid content of the photocatalyst-containing composition of the present invention in an amount of 10% by weight to 99.9% by weight, particularly 50% by weight to 99% by weight. This makes it possible for the photocatalyst-containing composition to exhibit various functions.

(Photocatalyst-containing composition) The photocatalyst-containing composition of the present invention is not particularly limited as long as it contains the above-mentioned photocatalyst and silver oxide, and appropriately contains a binder, a solvent, additives and the like as necessary. It may be something to do. Further, as described above, when silver oxide is added to the photocatalyst in the state of silver such as silver colloid, silver may be contained in the photocatalyst-containing composition.

When silver is contained in the photocatalyst-containing composition, the silver content is 0.95 or less, especially 0.5 or less, assuming that the weight% of silver oxide contained in the stable state of the photocatalyst-containing composition is 1. Is preferable. This is because when the photocatalyst-containing composition is irradiated with energy and silver oxide is reduced, the color of the photocatalyst-containing composition can be changed.

Here, the shape and the like of the photocatalyst-containing composition in the present invention is not particularly limited as long as it contains a photocatalyst and silver oxide, and for example, a solution in which the photocatalyst and silver oxide are dispersed may be used. It may be powder, or it may be layered or the like.

The method for producing the photocatalyst-containing composition of the present invention will be described in the section "G. Method for producing the photocatalyst-containing composition" described later, and thus detailed description thereof will be omitted here.

B. Photocatalyst-containing fine particles Next, the photocatalyst-containing fine particles of the present invention will be described. The photocatalyst-containing fine particles of the present invention are characterized by containing the above-mentioned photocatalyst-containing composition.

According to the present invention, since the photocatalyst-containing composition is contained and is in the state of fine particles, for example, the photocatalyst-containing fine particles can be easily mixed with other substances and can be used for various purposes. Further, in this case, since the surface area of the photocatalyst can be increased, there is an advantage that the effect of the photocatalyst can be further exerted. Examples of applications of such photocatalyst-containing fine particles include antibacterial agents and filters.

Here, the particle size of the photocatalyst-containing fine particles in the present invention is appropriately selected depending on the use of the photocatalyst-containing fine particles and the like, but is usually about 5 μm to 200 μm, particularly about 20 μm to 100 μm. This is because it can be used for various purposes.

In the present invention, the photocatalyst-containing fine particles may be composed of only the photocatalyst-containing composition, or may contain other additives or the like as appropriate. When the photocatalyst-containing fine particles are mixed with other additives or the like, the amount of the photocatalyst-containing composition contained in the photocatalyst-containing fine particles is 0.01% by weight to 50% by weight, particularly 0.1% by weight or more. It is preferably about 10% by weight. This makes it possible to exert the effect of the photocatalyst-containing composition. The additives and the like to be used will be appropriately selected depending on the purpose.

C. Filter Next, the filter of the present invention will be described. The filter of the present invention is not particularly limited as long as it contains the above-mentioned photocatalyst-containing fine particles, and for example, a filter used in an air purifier for removing malodorous substances and Escherichia coli are supplemented. Water treatment filter, agricultural waste liquid treatment filter that removes harmful substances such as pesticides, and ethylene gas generated by agricultural products by CO₂And O₂It can be used as a freshness-preserving filter or the like that decomposes into.

Examples of the method of incorporating the photocatalyst-containing fine particles into such a filter include a method of immobilizing the photocatalyst-containing fine particles in a generally used filter using a binder and the like, and a method of immobilizing the photocatalyst-containing fine particles in a material used for the filter. Examples thereof include a method of kneading and molding the contained fine particles, a method of incorporating the contained fine particles into metal, ceramics, and apatite. In either case, the photocatalyst-containing composition is used in a state in which there is sufficient energy to excite the photocatalyst.

D. Antibacterial agent Next, the antibacterial agent of the present invention will be described. The antibacterial agent of the present invention is not particularly limited as long as it contains the photocatalyst-containing fine particles, and for example, the antibacterial agent may be used by arranging the photocatalyst-containing fine particles as they are. It may be used by kneading the photocatalyst-containing fine particles into a resin or the like, or by incorporating the photocatalyst-containing fine particles into the fiber. Further, it may be used as a paint by being dispersed in a solvent or the like.

In the present invention, since the photocatalyst-containing fine particles are contained, the photocatalyst can be easily excited and exert its antibacterial action even with weak ultraviolet light or the like, so that it is used, for example, indoors. It has the advantage that it can exert a high effect even when it is used for things.

Various uses of antibacterial agents containing such photocatalyst-containing fine particles include interior and exterior materials of buildings such as wallpaper, wall materials, window glass, sashes, and window frames, blinds, curtains, carpets, showcases, and the like. Interior products, eyeglasses, glass lenses, windshields, door mirrors, mirrors and other glass products, lighting fixtures, lighting, black lights, TVs, refrigerators, audio equipment, computers, personal computers, printers, facsimiles and other electrical equipment, tents, For daily necessities such as umbrellas and table cloths, furniture such as bowls, bookshelves, desks and tables, interior and exterior materials for vehicles such as automobiles, trains, airplanes and ships, agricultural films, weed-proof sheets, seedling raising sheets and other agricultural and horticultural materials. Examples include sheets and food packaging materials.

Further, by kneading the photocatalyst-containing fine particles into a plastic film or the like, an antibacterial film or the like that can be attached to various objects can be obtained.

In any of the above cases, the photocatalyst in the photocatalyst-containing composition is used in a state where there is sufficient energy to excite the photocatalyst.

E. Photocatalyst-containing layer Next, the photocatalyst-containing layer of the present invention will be described. The photocatalyst-containing layer of the present invention is not particularly limited as long as it is a layer containing the above-mentioned photocatalyst-containing composition, and is appropriately containing another material such as a binder depending on its use and the like. It may be.

According to the present invention, since the photocatalyst-containing composition is contained in the photocatalyst-containing layer, the photocatalyst can be easily excited by the action of the silver oxide. Therefore, for example, a characteristic change layer that is decomposed or modified by the action of a photocatalyst accompanying energy irradiation is formed on the photocatalyst-containing layer, and a patterning substrate or the like that changes the characteristics of the characteristic change layer only in the energy-irradiated portion is used. You can also. In addition, since organic substances and the like adhering to the photocatalyst-containing layer can be decomposed, it can also be used as an antifouling layer or the like that can be used for various purposes.

Here, the photocatalyst-containing layer in the present invention is not particularly limited as long as it contains the above-mentioned photocatalyst-containing composition, and may be, for example, a layer consisting only of the photocatalyst-containing composition, or may contain a photocatalyst. Depending on the use of the layer and the like, it may be a layer or the like containing another material or the like as appropriate.

Such a photocatalyst-containing layer can be formed by applying a photocatalyst-containing layer-forming composition to which a necessary material is added to the above-mentioned photocatalyst-containing composition and firing or the like. The coating at this time can be performed by a known coating method such as spin coating, spray coating, dip coating, roll coating, and bead coating. Further, as a method of drying the composition for forming a photocatalyst-containing layer by firing or the like, for example, a hot plate, an infrared heater, an oven or the like can be used.

The film thickness of the photocatalyst-containing layer is appropriately selected according to its use, purpose, etc., but is usually about 0.01 μm to 5 μm, and more preferably about 0.05 μm to 1 μm.

F. Patterning substrate Next, the patterning substrate of the present invention will be described. The patterning substrate of the present invention is characterized by having the above-mentioned photocatalyst-containing layer, and is not particularly limited as long as it can form a pattern having different characteristics on the surface. As such a patterning substrate, for example, the photocatalyst-containing layer may contain a property-changing material whose properties change due to the action of the photocatalyst associated with energy irradiation, or, for example, a photocatalyst associated with energy irradiation. A property-changing layer containing a property-changing material that is decomposed or modified by the action of the above may be formed on the photocatalyst-containing layer. In either case, due to the action of the photocatalyst accompanying the energy irradiation, the characteristic changing material in the photocatalyst-containing layer or the characteristic changing layer is decomposed or modified, and the characteristics of only the energy-irradiated portion are changed. Because it can be done.

In the present invention, the properties that change due to the action of the photocatalyst associated with such energy irradiation are not particularly limited, and for example, a polymer material such as polyolefin such as polyethylene or polypropylene is used as the property changing material. As a result, the energy-irradiated portion may be used as a patterning substrate that introduces polar groups or has a rough surface due to the action of a photocatalyst to improve adhesion to various substances. .. By using a patterning substrate whose characteristics change in this way, it is possible to form a pattern with good adhesiveness, and it is possible to easily form a functional portion by utilizing this difference in adhesiveness. Because it can be done.

Furthermore, for example, organopolysiloxane, which exhibits high strength by hydrolyzing and polycondensing chloro or alkoxysilane by a sol-gel reaction or the like, as described in Japanese Patent Application Laid-Open No. 2003-195029, and water repellency. Organopolysiloxane such as organopolysiloxane crosslinked with reactive silicone having excellent oil repellency may be used as a characteristic changing material, and a patterning substrate whose surface wettability changes due to the action of a photocatalyst accompanying energy irradiation may be used. In this case, the energy-irradiated region can be a region with good wettability, and the functional portion can be easily formed by utilizing the difference in wettability. ..

Further, a decomposition removal layer is formed on the photocatalyst-containing layer by using, for example, a self-assembled monolayer, a Langmuir-Bloget film, an alternating adsorption film, etc., as described in JP-A-2003-195029. However, the organic group on the surface may be decomposed and removed by the action of the photocatalyst accompanying the energy irradiation to form a patterning substrate.

Here, the patterning substrate of the present invention can be formed by forming a photocatalyst-containing layer and, if necessary, a characteristic change layer on the photocatalyst-containing layer on the base material. Examples of the method for forming such a photocatalyst-containing layer and the characteristic change layer include a dry method, that is, a vacuum vapor deposition method, and a wet method, that is, a spin coating method, a dip coating method, and the like.

The energy used to change the properties of the property-changing material is set in the range of 400 nm or less, preferably in the range of 150 nm to 380 nm. This is because the preferred photocatalyst used for the photocatalyst-containing layer is titanium dioxide, and light having the above-mentioned wavelength is preferable as the energy for activating the photocatalytic action by the titanium dioxide.

Examples of the light source that can be used for such energy irradiation include a mercury lamp, a metal halide lamp, a xenon lamp, an excima lamp, and various other light sources. Further, in addition to the method of performing pattern irradiation through a photomask using a light source as described above, it is also possible to use a method of drawing and irradiating in a pattern using a laser such as excimer or YAG. The amount of energy to be irradiated is the amount required for the properties of the property-changing material to be changed by the action of the photocatalyst in the photocatalyst-containing layer.

G. Method for Producing Photocatalyst-Containing Composition Next, a method for producing the photocatalyst-containing composition of the present invention will be described. The method for producing a photocatalyst-containing composition of the present invention is characterized by adding a silver colloid to a photocatalyst to produce a photocatalyst-containing composition containing a photocatalyst and silver oxide.

In general, silver oxide has the property of being weak against light and heat and easily decomposed, but according to the present invention, by adding a silver colloid to a photocatalyst and dispersing it, it is dispersed by the action of the photocatalyst. The silver colloid is oxidized and changed to silver oxide, so that a photocatalyst-containing composition containing a photocatalyst and silver oxide can be stably obtained. Further, by producing using silver colloid, silver oxide can be stably dispersed in the photocatalyst-containing composition without agglomeration or the like.

The method for producing the photocatalyst-containing composition of the present invention is particularly limited as long as it is possible to disperse the photocatalyst and the silver colloid so that the photocatalyst and silver oxide can be stably present to obtain the photocatalyst-containing composition. Instead, for example, a titanium oxide coating agent and a silver colloidal slurry dispersed in a solvent compatible with the solvent used in the titanium oxide coating agent are dispersed by mixing or the like to obtain a photocatalyst-containing composition. be able to.

Here, the silver colloid used in the present invention is preferably composed of a solid content containing particles composed of a silver component and an organic component as main components and a solvent. This is because the dispersion stability of the particles in the solution is high and the silver colloidal particles are less likely to aggregate.

Further, in the present invention, it is preferable that the photocatalyst is also used in the state of a sol solution like the above-mentioned titanium oxide sol solution. This is because the photocatalyst can also be stably dispersed in the photocatalyst-containing composition.

Further, in the case of producing a layered photocatalyst-containing composition, it can be produced by applying the solution in which the photocatalyst and the silver colloid are dispersed on a target support and firing or the like. The coating at this time can be performed by a known coating method such as spin coating, spray coating, dip coating, roll coating, and bead coating. Further, as a method of drying the composition for forming a photocatalyst-containing layer by firing or the like, for example, a hot plate, an infrared heater, an oven or the like can be used.

When producing a particulate photocatalyst-containing composition, silver colloid and titanium oxide are mixed with an organic solvent, and the mixture is stirred and dispersed to prepare a slurry. The slurry is sent to an atomizer to be atomized, the solvent is instantly blown off and dried, and the silver colloid is supported on the titanium oxide fine particles. It can be produced by heating and firing titanium oxide supporting silver colloid at a high temperature to decompose organic substances and generate a photocatalyst supporting metal ultrafine particles.

The present invention is not limited to the above embodiment. The above embodiment is an example, and any one having substantially the same configuration as the technical idea described in the claims of the present invention and exhibiting the same effect and effect is the present invention. It is included in the technical scope of the invention.

Examples and comparative examples are shown below, and the present invention will be described in more detail.

[Example 1]

&lt;Preparation method of coating liquid for pattern-forming body&gt; Fluoroalkylsilane (TSL8233 GE manufactured by Toshiba Silicone) 1.5 g, tetramethoxysilane (TSL8114 GE manufactured by Toshiba Silicone) 5.0 g, and 0.01N hydrochloric acid 2.5 g are stirred at room temperature for 24 hours. To prepare a liquid repellent-imparting agent. Next, titania sol (STS-01 manufactured by Ishihara Sangyo) is TiO in a mixed solution of water and isopropanol (weight ratio = 1: 1).₂Diluted to a concentration of 0.5 wt%. To 45 g of this diluted solution, 5 g of a silver colloidal aqueous dispersion (average particle size: 20 nm, silver solid content: 0.5 wt%) was added, and the mixture was stirred for 10 minutes. 2 g of a liquid-repellent imparting agent was added to this liquid, and the mixture was stirred for 10 minutes to prepare a coating liquid for a pattern-forming body.

&lt;Method for producing pattern-forming body&gt; After applying the pattern-forming body coating liquid on a glass substrate, it was dried at 200 ° C. to form a characteristic change layer having a thickness of 0.15 μm. The contact angle of this characteristic change layer with water was measured and found to be 102 °. Next, an ultra-high pressure mercury lamp (365nm 37mW / cm)²), The contact angle of water became 10 ° or less in 20 seconds.

[Comparative example 1]

A liquid-repellent imparting agent was prepared in the same manner as in Example 1. Next, titania sol (STS-01 manufactured by Ishihara Sangyo) is TiO in a mixed solution of water and isopropanol (weight ratio = 1: 1).₂Diluted to a concentration of 0.5 wt%. 2 g of a liquid-repellent imparting agent and 5 g of water were added to this liquid, and the mixture was stirred for 10 minutes to prepare a coating liquid for a pattern-forming body. A characteristic change layer was formed on the glass substrate in the same manner as in Example 1, and the contact angle between the characteristic change layer and water was measured and found to be 105 °. Next, an ultra-high pressure mercury lamp (365nm, 37mW / cm)²), The contact angle of water was 70 ° in 20 seconds, and the contact angle with water was 10 ° or less in 50 seconds.

[Example 2]

&lt;Preparation method of coating liquid for forming antifouling layer&gt; Titania sol (STS-01 manufactured by Ishihara Sangyo) is TiO in a mixed solution of water and isopropanol (weight ratio = 1: 1).₂Diluted to a concentration of 1 wt%. To 45 g of this diluted solution, 5 g of a silver colloidal aqueous dispersion (average particle size of 20 nm, silver solid content of 0.5 wt%) was added, and the mixture was stirred for 10 minutes to obtain a coating solution for forming an antifouling layer.

&lt;Method for preparing antifouling layer&gt; The obtained coating liquid for forming an antifouling layer was applied onto a glass substrate and dried at 200 ° C. to prepare an antifouling layer having a thickness of 0.2 μm. The contact angle of this antifouling layer with water was measured and found to be 5 ° or less.

&lt;Evaluation of recoverability of hydrophilic activity (antifouling effect)&gt; A stain component was attached to the obtained antifouling layer, and the recoverability of hydrophilic activity was examined. First, a xylene solution of 0.005% linoleic acid triglyceride was applied to the antifouling layer and dried at a temperature of 100 ° C. for 10 minutes. The contact angle of this antifouling layer with water before light irradiation was 15 °. After that, the amount of ultraviolet light is 1 mW / cm²When the black light was irradiated for 5 minutes, the contact angle with water was 5 ° or less.

[Comparative example 2]

&lt;Preparation method of coating liquid for forming antifouling layer&gt; Titania sol (STS-01 manufactured by Ishihara Sangyo) is TiO in a mixed solution of water and isopropanol (weight ratio = 1: 1).₂Diluted to a concentration of 1 wt%. 5 g of water was added to 45 g of this diluted solution, and the mixture was stirred for 10 minutes to prepare a coating solution for forming an antifouling layer.

&lt;Preparation method of antifouling layer&gt; The obtained coating liquid for forming an antifouling layer was applied onto a glass substrate and then dried at 200 ° C. to form an antifouling layer having a thickness of 0.2 μm. The contact angle of this antifouling layer with water was measured and found to be 5 ° or less.

&lt;Evaluation of recoverability of hydrophilic activity (antifouling effect)&gt; Next, as in Example 2, when a stain component was attached and the recoverability of hydrophilic activity was examined, the contact angle with water before light irradiation was examined. Is 15 ° and the amount of ultraviolet light is 1 mW / cm²The contact angle with water after irradiation with black light for 5 minutes was 11 °, and after irradiation for 15 minutes, it became 5 ° or less.