Patent ID: 7682672
Filing Date: 2010-03-23
Classification: B32B,C09K,G02F,Y10T

Abstract:
1. A negative C-type compensation film comprising: a) a base layer; and b) a polymer layer comprising polyarylate which comprises a repeating unit represented by the formula (1) and prepared by copolymerizing divalent phenols, divalent aromatic carboxylic acid halides, and 0.01 to 49.9 mol % of bisphenol derivatives of the formula (2), the base layer and the polymer layer being sequentially layered, wherein R W and W′ are each independently directly bonded, or are each independently oxygen, sulfur, sulfoxide, sulfone, alkylidene having 1 to 30 carbon atoms, alkylene having 2 to 30 carbon atoms, cycloalkylidene having 3 to 30 carbon atoms, cycloalkylene having 3 to 30 carbon atoms or phenyl-substituted alkylene having 2 to 30 carbon atoms; and —OOCYCOO— and —OOCY′COO— are each independently terephthalic acid, isophthalic acid, dibenzoic acid or naphthalene dicarboxylic acid, in which the aromatic group may be substituted with a substituent selected from the group consisting of alkyl having 1 to 8 carbon atoms, aryl, alkylaryl and halogen, and wherein R W is directly bonded, or is oxygen, sulfur, sulfoxide, sulfone, alkylidene having 1 to 30 carbon atoms, alkylene having 2 to 30 carbon atoms, cycloalkylidene having 3 to 30 carbon atoms, cycloalkylene having 3 to 30 carbon atoms or phenyl-substituted alkylene having 2 to 30 carbon atoms.