Optical film, polarizing plate using the same, method for producing the polarizing plate, and liquid crystal display device
A technology for optical films and polarizers, applied in the field of optical films, can solve problems such as increased cost, high difficulty in resin manufacturing, and impurities in additives
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preparation example Construction
[0088]
[0089]In the production process of the optical film of the present invention, in order to remove the contrast reduction factor caused by the deformation of the cellulose molecules caused by the stress when peeling from the film-forming substrate in the film-forming process, it is preferable to increase the cellulose ester resin-containing composition. (mucilage) and the peelability of the film substrate.
[0090] In cellulose acetate with an average degree of substitution of acetyl groups of 2.0 to 2.6, since the peeling force at the initial stage of optical film production (peeling at the beginning of production) is high, the generation of stress is large, so the reduction in cellulose ester resin Containing impurities can improve peelability and inhibit the deformation of cellulose molecules caused by stress.
[0091] In order to improve peelability, it is preferable to reduce cellulose resin raw material or alkaline earth metal salts (Ca salt, Mg salt) or residua...
Synthetic example
[0241] (Synthesis Example: Synthesis of Compounds of the Present Invention)
[0242] [chemical formula 6]
[0243]
[0244] Add 34.2g (0.1 mol) of sucrose, 135.6g (0.6 mol) of benzoic anhydride, and 284.8g (3.6 mol) of pyridine in a four-necked flask equipped with a stirring device, a reflux cooler, a thermometer and a nitrogen inlet pipe, and While bubbling nitrogen gas from a nitrogen gas introduction tube, the temperature was raised, and esterification reaction was performed at 70° C. for 5 hours.
[0245] Next, reduce the pressure in the flask to 4×10 2 After distilling off excess pyridine at 60° C. below Pa, the pressure in the flask was reduced to below 1.3×10 Pa, and the temperature was raised to 120° C. to distill off most of benzoic anhydride and generated benzoic acid. Then, 1 L of toluene and 300 g of a 0.5% by mass sodium carbonate aqueous solution were added, and after stirring at 50° C. for 30 minutes, the mixture was left still, and the toluene layer was fr...
Embodiment 1
[0563]
[0564] 16 parts by mass of sulfuric acid, 260 parts by mass of acetic anhydride, and 420 parts by mass of acetic acid were added to 100 parts by mass of cellulose, and the temperature was raised from room temperature to 60°C over 60 minutes while stirring, and the acetylation reaction was carried out while maintaining the temperature for 15 minutes. . Next, an acetic acid-water mixed solution of magnesium acetate and calcium acetate was added to neutralize the sulfuric acid, and then steam was introduced into the reaction system, and the temperature was maintained at 60° C. for 120 minutes to perform saponification and aging treatment. Thereafter, it was washed with a large amount of water, and further dried to obtain cellulose ester resin CE-1.
[0565] It should be noted that the obtained cellulose ester resin CE-1 is cellulose triacetate having an average acetyl substitution degree of 2.88. When the number average molecular weight is Mn and the weight average mol...
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Abstract
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