Patent ID: 6103323
Filing Date: 2000-08-15
Classification: C08F,C09K,G02B

Abstract:
A circular dichroism optical element, characterized by having a solid layer of a liquid crystal polymer comprising a Grandjean oriented cholesteric liquid crystal phase, wherein the liquid crystal polymer has a glass transition temperature of 80.degree. C. or more and comprises a copolymer comprising a monomer unit represented by the following formula (a) and a monomer unit represented by the following formula (b): ##STR20## wherein R.sup.1 represents a hydrogen atom or a methyl group; m represents an integer of from 1 to 6; X.sup.1 represents a CO.sub.2 group or an OCO group; and p and q each represent 1 or 2 and satisfy p+q=3, ##STR21## wherein R.sup.2 represents a hydrogen atom or a methyl group; n represents an integer of from 1 to 6; X.sup.2 represents a CO.sub.2 group or an OCO group; and X.sup.3 represents --CO--R.sup.3 or --R.sup.4, wherein R.sup.3 represents ##STR22## R.sup.4 represents ##STR23## R.sup.5 represents the following group ##STR24##