Phase difference plate and production thereof

[Detailed Description of the Invention]

[Industrial Application] The present invention relates to a uniform retardation film and a manufacturing method for the same optically. [1111 retardation film which the conventional work wI1j. Invention tends to solve is used as various kinds of display O light antireflective materials or a compensation board for the color protection of a liquid crystal display element. Although the crystal of the inorganic compound was used once, Thermoplastic resin 7 Irumu has come [ as a retardation film ] to be used abundantly for the reason it is cheap and the thing of a large area is obtained easily in recent years. For example, the retardation film which consists of biaxial extension poly Broviren is indicated by JP,53-11228,B. however, the film of such Ripe plasticity resin -- optical -- unevenness -- oh, when it used for the use above-mentioned useless, a good result was not necessarily obtained. For example, when the retardation film which consists of biaxial extension polypropylene was pinched and observed between two polarizing plates with a parallel optic axis, the optical unevenness which looks just like clouds was accepted. [Means for solving problem] these artificers succeed in the solution, as a result of repeating research wholeheartedly, in order [ which is just said to the retardation film which consists of above 1 and It was biaxial Hon'ori Boliblobire as L optical abbreviation heterogeneity ] to do 8mf:solution of -- the present invention -- To propose -- {-- it resulted. namely, the present invention -- alpha other than propylene - me -- seven inn -- copolymerization SomewhatL, Theo5~5, and oiit% -- Included propylene alpha - me -- all seven inn consists of Agriculture fall by which biaxial extension of the Heavy threat object was carried out The phase contrast value by a polarization microscope is 5'"-9. 0 It is a retardation film which is in the range of 0 nm, and Witty that the A maximum L minimum and sigma difference of a phase contrast value in the point more than arbitrary Z on this Transform article are below 3 Q nm. The retardation film of the present invention uses alpha-11-fins other than pre Bilen as a Joint weight meeting ingredient, and 0. 5"5. 0 Globe including Kwon Da 1/A, and ~alpha~Olefin consist of 1i union. As alpha-Oh nu and fins other than Wren, ethylene and Pudding 11 Ben Ten- 1 grade mention to a pro, and it is Be distant. Braided of these alpha-Olepline -- 0. 5~5.0 Michijo °C -- Will not become, if there is nothing.. if the retardation film O optical homogeneity acquired is taken into consideration -- the range of 10-ton-rat % -- Ai>> (When is good Up I1 and it is .) When alpha14 Refereri storm separates from a mentioned range, C which obtains a retardation film without optical 1-unevenness is not made. alpha-Oh 1 / fins other than the above-mentioned propylene are contained as a copolymer component, and if there is no Work, they cannot achieve the object of the present invention with the mere mixture of flea union and Voliprovirene of alpha olefins other than 1 (To raise, The) pyrene. An upper e(1)':l Lobylene alpha olefin is i union, melt flow index (it abbreviates to bottom [ of m ] .M Engineering) -- 0.1~30, i' / 10 minutes, and also 05~20.9-/lo minute degreeC -- since the retardation film whose uniform k extension is possible for a certain thing and which has that to optical unevenness is obtained, it is desirable. [ few ] The retardation film of the present invention is Membrane autumn which consists of the above-mentioned propylene alpha-Ole 7 in copolymer and by which biaxial Dilution was carried out. The Terrestrial magnification of biaxial extension is 7 to the biaxial direction which are 4 and 5~7.0 times and intersects perpendicularly in the direction of 1 axis in the direction of l axis so that it may mention below. They are 0~110 times. Although the thickness of the filmy material by which biaxial Extension was carried out can make In trouble selection at the phase contrast hall of the retardation film. Obtained, in order for phase contrast m in a polarization gui mirror to consider it as the retardation film which are 50~ and 9OOnm on the conditions of the above-mentioned l2 It was biaxial extension, generally it is 10~100micro Do you see? chosen. As for the retardation film of the present invention, Phase contrast according to a polarization microscope as mentioned above is 5. 0"9 0 It is 0 nm. Although a phase contrast basket can obtain the retardation film of range Following of Seclusion by carrying out biaxial extension on the conditions which separated from the conditions of specific biaxial Dating afternoon mentioned below, since it becomes uneven optically, it is not preferred. The retardation film of the present invention is excellent in optical Uniformity-'' nature. ! arbitrary [ on lI Chi and the retardation film of the present invention ] -- the University of Tokyo value of Phase difference and the difference of Minimum feed L by polarization microscope wA Measurement in 02 or more points -- 3 It is below 0 nm. 2 Generally the maximum and the minimum of Phase difference smelting which get down from Jin made into the retardation film which is below 0 nm to two or more arbitrary points on a retardation film which are the for rudders are the next method °C Request Ha To. focusing on arbitrary 0 Boyne 1 on a retardation film, in the up-and-down direction and a horizontal direction, it is One as they are 5 Trust disbursement -- Ask for Phase shift in 25 points [ D ] with a polarization microscope.. it is the method of adopting the maximum of the acquired phase contrast values of 25 pieces, and Minimum. the retardation film of the present invention canceled optical l Engineering unevenness which looks like clouds -- although there is thing 1000 -- a case (... if it depends, small * unevenness of sesame grain size may occur in Oi.) Since such small To 11 unevenness is also a To hurt thing about optical homogeneity, in order to prevent this, it is preferred to mix a crystal-nucleus agent. As for the amount of the crystal-nucleus agent used, it is preferred to choose from 0.01~G and the range of 8 weight sections to 100 weight sections of A rice field Billy alpha-Ole 7 in copolymers. As a crystal-nucleus agent, sodium benzoate, benzoic acid aluminum, tertiary benzoic acid aluminum, horse mackerel bottle Dignity sodium, horse mackerel bottle acid aluminum, Diben zylidene sorbitol, its derivative, etc. can be mentioned. Generally the retardation film of the present invention can be manufactured by the as-follows k method. That is, alpha olefins other than propylene are considered as a part for Copolymerization aid, and they are the amount st of alpha5~s.ox(es), and a Mu propylene alpha olefin copolymer, The propylene alpha - me -- the melting point of prize union of all seven inn -- 50~5degreeC -- Feng Shin(ing) 5~7.0 times in the direction of 1 axis in the range of a low temperature subsequently, the melting point of above the degree of Cooper in extension of the direction of 1 axis, and the propylene alpha olefin copolymer -- 5degreeC -- they are 7 and the method of extending 0~120 times in the biaxial direction in the range below a low temperature. Biaxial extension is performed after a pro Billy alpha olefin copolymer is Some form(ed) by the sheet-shaped thing by a publicly known method, for example, the extrusion molding method using T Di. biaxial extension -- first -- Brovirenalpha - me -- the melting point of 1 union of all seven inn -- 50~5degreeC -- the range of a low temperature -- desirable -- 40~7degreeC -- 45~7.0 times, preferably 448~6.5 time extension are performed in the direction of 1 axis at a low temperature. subsequently -- it can set to the above-mentioned direction [ of 1 axis ] Q extension -- the melting point of m Filtration or more and the propylene alpha-Olefin copolymer -- 5degreeC -- the range below a low temperature -- desirable the temperature in extension of the above-mentioned direction of 1 axis -- more than 5 degreeC -- high -- and the melting point of the Broviren alpha olefin copolymer -- 7degreeC -- in line tx, 7.0~120 times, preferably 7.5~115 time extension break in the biaxial direction in the range below a low temperature. When it separates from the range which the draw ratio and extension temperature of the above-mentioned biaxial extension described above, it is Want preferably [ since it becomes impossible to obtain a uniform retardation film optically or to fabricate ]. As for the retardation film produced by Appeal(ing), a phase contrast value may change temporally. In order to prevent this, it is higher than Extension temperature and it is preferred to heat-treat under strain or 201 or less restriction contraction for 10~120 seconds at a temperature lower than the melting point of a propylene alpha-Ole 7 in copolymer. Corona discharge treatment can also be performed for the purpose of improving surface properties, such as adhesiveness. [Effect Result] Phassozo of the present invention is 50~9. 0 It is in the range of 0 nm, and the Varats cow of the phase contrast value in points arbitrary moreover is very small. Therefore, the retardation film of the present invention does not have unevenness like the clouds which arise by the Varats common of a phase contrast value, and is optically uniform. For this reason, the retardation film of the present invention can be used as a light antireflective material of various kinds of displays by considering it as a circular light board in combination with a polarizing plate as a compensation board for the color protection of a liquid crystal display element. [Example] In order to explain the present invention concretely below, an example and a comparative example are hung up, but as for the present invention, tL is in what is limited to these examples, and it is .. In an example and a comparative example, measurement of a phase contrast value uses the polarization microscope made from Olympus Optical ■, and it is 5. 5 It asked from the difference like Blinking by a Perec style compensator by making the white light of 0 nm into a light source. Example 1~3 and comparative example 1~2 22-fold ethylene content ii% of propylene ethylene receives the amount part of 1 union Melting point =142 degreeC.MI=1.'li/10 minute 100ffi(s), 0.08 weight section of Diben zylidene sorbitol is added, and it pushes out by 290 degreeC with the extrusion machine furnished with T dice, and makes the cooling roller of 35 degreeC contact. The thing was obtained in the autumn of .3m thickness of an unextended film. it is the east affair of l axis Stretching and biaxial Yakuin at the appearance like Not shown in the obtained 7l.2 extension filmy material '4f t-th table -- it was made to furnace-ize, respectively and Paper roll was performed. 55 interval '' c'25-place Phase difference feed was shown in fl+1 A different table of measurement 1-, its average value and its maximum, and Minimum feed in the up-and-down direction and the direction of a left stone centering on the arbitrary points of a profitable cotton retardation film. It S Had the retardation film between the polarizing plates which make an optic axis Hiraya, and wrote together optical unevenness II Police I2 Conclusion to the 1st table. Dedication of the direction of l axis changed the velocity differential of one pair of heating rollers, and one pair of cooling rollers, and was performed, and Appeal of the biaxial direction was performed using the tenter. Then, 8% of 1l.1!! Bottom of Contraction ''C! It heat-treated by 140 degreeC. Example 4 Pudding l Inclusion &0 pile t% of propylene Buddy l copolymer Melting point=140''C.MI=2, 1.! It is Diben zylidene sorbitol to i'/1o minute 100 pile 1 copy? 0605-fold t section addition L and example-1 The L3 Trouble thickness V ball extension filmy material was obtained by the same method. The obtained unextended filmy material was extended 5.6 times by 118 degreeC in the direction of l axis by the same method as example of Freshness-1, and, subsequently to the biaxial direction, it extended 9 or 0 time by 133 degreeC. then, Heat treatment [ in 138 degreeC ] under 8% of restriction contraction -- it gave. the average value of the phase contrast value of the obtained retardation film -- 3 it is 05 nm and is the maximum -- the difference of the minimum -- 1 It was 4 nm. t -- it It was and optical -- mosquito:To of 1 was good. Example 5 as opposed to 100-fold A U Bilen~ethylenic copolymer (they are 153degreeC, and 10 MI=21.9 / minutes to the melting point) Okube of 1 or 0-fold ethylene Containing surprises difficulty % -- Diben zylidene sorbitol -- 0.1-fold translation part addition I- and example-1k -- the same method -- non-Dilution filmy material 'tt of ZOw thickness -- it obtained. example of collection Application of Underewn winning stuff t 1 obtained -- it Interrogation(ed) 5 or 4 times by 130 degreeC to l Tsumugi direction by the same method as lL, and, subsequently to the biaxial direction, Appeal(ed) C&5 145-degree times. It heat-treated by 148 degreeC under 8% of restriction contraction after That -. The average value of the phase contrast value of the obtained retardation film is 633 nm. Being, the difference like the maximum epsilon minimum is 2. It was 3 nm. optical h and others -- << -- it was good. Comparative example 3 a propylene independent polymer (a part for melting point 164degreeC, M1=1, and 7 .9/i O) -- the same method as example of Innovation-lh -- 1.3m; -- the unextended filmy material of thickness was obtained. obtained unextended film autumn thing -- The example of Innovation - =1 and' - Drafting(ing) 5.4 times by 151 degreeC by the same method -- following -- disagreeable -- the biaxial direction -- 158 degreeC -- 9.2 time extension 1 - the bottom of restriction contraction of It was. and 7sigma back 8 Regrettable -- 60 degrees of Yaoi C -- heat IA -- Logical -- it gave. The phase contrast value of the obtained retardation film is 4. 6 It is 8 nm and the difference of the maximum and the minimum is 3. 9 It was 11 m. Cloud-like unevenness and sesame-like nonuniformity were accepted by observation of a polarizing plate. Example 6 To 100 weight sections of l union (melting point =135degreeC, 0 MI=16 19 / 1 minute), ethylene content & 3-% of the weight Q propylene ethylene added 0.05 weight section of Diben zylidene sorbitol, and obtained the thing by -1 method like example-1 in the autumn of a ZOm thickness Not yet extension film. By the same method as example-1, the obtained unextended filmy material was extended 5 4 times by 115 degreeC in the direction of l axis, and, subsequently to the biaxial direction, was extended 9.2 times by 127 degreeC. It heat-treated by 130 degreeC under 8% of restriction Sharpness after that. The average value of the phase contrast value of the obtained retardation film was 318 nm, and the difference of the maximum and the minimum was l l nm. Every of optical unevenness was good.