Optical film, method for producing optical film, polarizing plate, and liquid crystal display device
An optical film and compound technology, applied in optics, polarizing elements, optical elements, etc., can solve problems such as wrinkles, and achieve the effects of less thermal wrinkles, less white turbidity, and high brightness
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Embodiment 1
[0344] While stirring and heating, the following components were fully dissolved to prepare a dope liquid.
[0345] (composition of mucilage)
[0346] Cellulose ester A1: 100 parts by mass
[0347] Polyester compound 1:10 parts by mass
[0348] UV absorber: Ti928: 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethyl Butyl)phenol (Tinuvin 928, BASF Japan): 3.0 parts by mass
[0349] Matting agent: R972V (Nippon Aerosil Corporation, silica particles, average particle diameter = 16nm): 0.30 parts by mass
[0350] Stripping aid: Elecut S412 (Takemoto Oil Co.): 0.50 parts by mass
[0351] Dichloromethane: 300 parts by mass
[0352] Ethanol: 40 parts by mass
[0353] The obtained dope solution was uniformly cast on a stainless steel belt support at a temperature of 22° C. and a width of 2 m using a belt casting apparatus. The solvent in the cement solution was evaporated to 100% residual solvent on a stainless steel tape support. Then, the obtained film w...
Embodiment 2～36、 comparative example 1～6 and 8～11
[0357] Optical films 102 to 142 and 144 to 147 were obtained in the same manner as in Example 1, except that any one or more of cellulose ester, additives and their contents, stretching conditions, and film thickness was changed as shown in Table 3 or 4. .
Embodiment 37
[0445] 1) Preparation of polarizer
[0446] A polyvinyl alcohol film having a thickness of 30 µm was swelled with water at 35°C. The obtained film was immersed in an aqueous solution composed of 0.075 g of iodine, 5 g of potassium iodide, and 100 g of water for 60 seconds, and further immersed in an aqueous solution of 45° C. composed of 3 g of potassium iodide, 7.5 g of boric acid, and 100 g of water. The obtained film was uniaxially stretched at a stretching temperature of 55° C. and a stretching ratio of 5 times. After washing this uniaxially stretched film with water, it was made to dry, and the polarizer with thickness 10 micrometers was obtained.
[0447] 2) Preparation of photocurable adhesive
[0448] After mixing the following components, defoaming was performed to prepare a photocurable adhesive. In addition, the triarylsulfonium hexafluorophosphate was mixed as a 50% propylene carbonate solution, and the solid content of the triarylsulfonium hexafluorophosphate i...
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