Patent ID: 9096691
Filing Date: 2015-08-04
Classification: B32B,C08B,C08J,C08L,C09K,G02B,G02F

Abstract:
1. A −A optical film comprising a regioselectively substituted cellulose ester, wherein said regioselectively substituted cellulose ester comprises a plurality of alkyl-acyl substituents and a plurality of aryl-acyl substituents, wherein said regioselectively substituted cellulose ester has a hydroxyl degree of substitution (“DS wherein the regioselectivity of said regioselectively substituted cellulose ester is such that the sum of the aryl-acyl degrees of substitution at C2 and C3 (“C2DS wherein said aryl-acyl substituent comprises benzoate, wherein said alkyl-acyl substituent comprises propionate, wherein said −A optical film has an in-plane retardation (“R