Patent ID: 7311950

Claim:
An optical compensatory film comprising at least one optically anisotropic layer formed of a composition comprising: at least one compound having a fluoro-aliphatic group and at least one hydrophilic group selected from the group consisting of a carboxyl group (—COOH), a sulfo group (—SO 3 H), a sulfato group (—OSO 3 H), a phosphonoxy group {—OP(═O)(OH) 2 } and salts thereof; at least one onium salt; and at least one liquid-crystal compound; wherein the compound having a fluoro-aliphatic group and at least one hydrophilic group is a compound represented by Formula (2b): (R 7 —L 1 —) m2 (Ar 1 —)—W 3 R 7 represents an alkyl group, an alkyl group having a terminal CF 3 group or an alkyl group having a terminal CF 2 H group; m2 denotes an integer greater than or equal to 1, wherein multiple occurrences of R 7 may be identical or different, with at least one representing an alkyl group having a terminal CF 3 group or a terminal CHF 2 group; L 1 represents a divalent linking group selected from the group consisting of an alkylene group, an aromatic group, —CO—, —NR— wherein R denotes a C 1-5 alkyl group or a hydrogen atom, —O—, —S—, —SO—, —SO 2 — and any combination thereof, where multiple occurrences of L 1 may be identical or different; Ar 1 represents an aromatic carbon ring residue or an aromatic hetero ring residue; and W 3 represents a carboxyl group (—COOH) or a salt thereof, a sulfo group (—SO 3 H) or a salt thereof, a sulfato group (—OSO 3 H) or a salt thereof, or a phosphonoxy group {—OP(═O)(OH) 2 } or a salt thereof; the onium salt is a quaternary ammonium salt; and the liquid-crystal compound is a discotic compound and molecules of the discotic compound are substantially aligned vertically in the optically anisotropic layer.