Optical filter employing a copolyglutamate having thermotropic cholesteric liquid crystal properties

摘要

An optical filter consisting essentially of a glutamate copolymer having thermotropic cholesteric liquid crystal properties and represented by the general formula: wherein R1 is an alkyl group, a cycloalkyl group, an aryl group or an arylalkyl group having 10 or less carbon atoms, and R2 an alkyl group, a cycloalkyl group, an aryl group or an arylalkyl group having 6 to 30 carbon atoms, provided that R1 and R2 are different from each other; m and n are numbers satisfying the following relationships 50