Optical film, polarizer and liquid crystal display device
An optical film and chemical formula technology, applied in optics, polarizing elements, optical elements, etc., can solve the problems of insufficient retardation performance of retardation expressing agents, large internal haze haze value, unknown retardation expressing agents, etc., and achieve high retardation Expressiveness, high compatibility, and the effect of inhibiting deterioration and bleeding
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[0304] A general method can be used for dissolving the thermoplastic resin in the preparation of the dope. If it is heated while pressurizing, it can be heated to a temperature equal to or higher than the boiling point under normal pressure. Stirring the dissolved solution at a temperature above the boiling point of the solvent under normal pressure and in a range where the solvent does not boil under increased pressure can prevent the generation of undissolved lumps called gels or lumps. In addition, it is also preferable to mix the thermoplastic resin with a poor solvent to make it wet or swell, and then to further add a good solvent to dissolve it.
[0305] Pressurization can be performed by a method of injecting an inert gas such as nitrogen or by heating to generate a vapor pressure of the solvent. Heating is preferably performed from the outside, but on the other hand, for example, a mantle heater is preferred because it is easy to control the temperature.
[0306] A t...
Embodiment 1
[0370] The details of the cellulose ester used in Example 1 are shown.
[0371] Cellulose ester A: cellulose diacetate with a number-average molecular weight of 70,000 and a degree of acetyl substitution of 2.40 (in the table, denoted as DAC)
[0372] Cellulose ester B: cellulose acetate propionate with a number average molecular weight of 70,000 with an acetyl substitution degree of 1.58, a propionyl substitution degree of 0.9, and a total acyl substitution degree of 2.48 (referred to as CAP in the table)
[0373] Cellulose ester C: cellulose triacetate with a number-average molecular weight of 70,000 and a degree of acetyl substitution of 2.85 (in the table, denoted as TAC)
[0374]
[0375]
[0376] After stirring and mixing 11.3 parts by mass of microparticles (Aerosil R972V Nippon Aerosil Co., Ltd. product) and 84 parts by mass of ethanol with a dissolver for 50 minutes, they were dispersed with a homogenizer (Manton-Gaulin).
[0377]
[0378] To well-stirred methy...
Embodiment 2
[0456] Using the main dope used in the production of the optical film 104 of Example 1, the flow rate of the dope during casting was changed, and the optical films 201 to 206 having the film thicknesses shown in Table 3 were produced. It produced similarly to Example 1 except the flow rate of the dope at the time of casting. The optical films 201-206 were evaluated similarly to Example 1. At this time, the optical film 132 produced in Example 1 was added as a comparative example.
[0457] In addition, the brittleness was evaluated by the following evaluation method.
[0458] (cutting suitability)
[0459] The brittleness was evaluated by the cutting suitability described below. A worn upper cutter of 60° and a lower cutter of 90° are installed on a hydraulic bench press so that the interval is 30 μm. Then, place the optical film between the two cutters, and continuously cut out 100 samples with a width of 90 cm and a length of 100 cm at a descending speed of the above cutt...
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Abstract
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