Transparent polymer film and method for producing it, and retardation film, polarizer and liquid crystal display device comprising the film
A technology of transparent polymers and polarizers, applied in polarizing elements, instruments, optics, etc., can solve problems such as consumption of film quality, unevenness, etc., and achieve the effect of high reliability, small fluctuations, and excellent retardation films
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preparation example Construction
[0094] As for the production method of cellulose acylate, its basic principle is described in Nobuhiko Migita et al., Wood Chemistry, pp. 180-190 (Kyoritsu Publishing, 1968). A typical preparation method of cellulose acylate is a liquid-phase acylation method using a carboxylic anhydride-carboxylic acid-sulfuric acid catalyst. Specifically, cellulose raw materials such as cotton linters or wood pulp are pretreated with an appropriate amount of carboxylic acid such as acetic acid, and then put into a pre-cooled acylation mixture for esterification to obtain complete cellulose acylate (wherein 2-, 3- and the total substitution degree of the acyl group at the 6-position is close to 3.00). The acylation mixture generally includes carboxylic acid used as a solvent, carboxylic acid anhydride used as an esterifying agent, and sulfuric acid used as a catalyst. Generally, the amount of carboxylic anhydride used in the process is in stoichiometric excess to the total amount of water pr...
Embodiment 101-111、 comparative Embodiment 101-105
[0236] (Preparation of film)
[0237] The following films were used in Examples and Comparative Examples, as shown in Table 1 below.
[0238] Film A:
[0239] A film formed according to Example 12 of JP-A-2005-104148, which is film A.
[0240] Film B:
[0241] Commercially available FUJITAC (TD80UF, produced by Fuji Photo Film) was used as it is, and the film was Film B.
[0242] Film C:
[0243] Commercially available FUJITAC (T80UZ, produced by Fuji Photo Film) was used as it was, and the film was Film C.
[0244] Film D:
[0245] Commercially available FUJITAC (TDY80UL, produced by Fuji Photo Film) was used as it was, and the film was Film D.
[0246] (heat treatment)
[0247]The transparent film thus obtained was subjected to heat treatment while fixing it in the longitudinal direction using a roll stretcher. The rolls of the roll stretcher are mirror polished induction heated jacketed rolls and their temperatures are individually controlled. The heat treatment zo...
Embodiment 112
[0260] Obtain the thin film of Re=130nm and Rth=25nm in the same manner as embodiment 103, yet change the heat treatment step of embodiment 103 as follows:
[0261] (heat treatment)
[0262] The resulting transparent film was heat-treated with equipment controlled at 240°C in a heating zone between two rolls. The draw ratio was controlled at 40% by controlling the peripheral speed of the rolls, and the aspect ratio (distance between rolls / base width) was controlled at 3.3. After stretching, the film is cooled and rolled up.
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Abstract
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