Patent ID: 7135211

Claim:
A retardation plate comprising a homeoffopic liquid-crystal film formed from a homeotropic side chain type liquid-crystal polymer or from a homeotropic liquid-crystalline composition comprising a homeotropic side chain type liquid-crystal polymer and a photopolymerizable liquid-crystalline compound laminated with a stretched film having a retardation function, wherein said homeotropic side chain type liquid-crystal polymer is a side chain type liquid-crystal polymer comprising a monomer unit (a) including a liquid-crystalline fragment side chain having positive refractive index anisotropy represented by general formula (a) and a monomer unit (b) including a non-liquid-crystalline fragment side chain represented by general formula (b), general formula (a): where, R 1 represents a hydrogen atom or a methyl group, a represents a positive integer of 1 to 6, X 1 represents a —CO 2 -group or a —OCO-group, R 2 represents a cyano group, an alkoxy group having a carbon number of 1 to 6, a fluoro group or an alkyl group having a carbon number of 1 to 6, and b and c represent integers of 1 or 2, respectively; general formula (b): where, R 3 represents a hydrogen atom or a methyl group, R 4 represents an alkyl group having a carbon number of 1 to 22, a fluoro alkyl group having a carbon number of 1 to 22 or a group represented by general formula (b1): where, d represents a positive integer of 1 to 6, and R 5 represents an alkyl group having a carbon number of 1 to 6.