Liquid crystal polymer composition, oriented film and process for producing the film

摘要

A liquid crystal polymer composition, a highly heat-resistant oriented film and a process for producing the oriented film are disclosed. The liquid crystal polymer composition contains a liquid crystal polymer producible through conventional copolymerization and from which a large film can be easily and efficiently produced by applying a solution thereof and a highly heat-resistant film of the monodomain orientation type can be formed by crosslinking the polymer in the film under practical conditions. The highly heat-resistant oriented film is obtained by orienting the liquid crystal polymer composition and crosslinking the polymer. The liquid crystal polymer composition comprises a side-chain type cholesteric liquid crystal polymer having as repeating units a segment having an unsaturated carbon ring as a crosslinkable side-chain terminal group, a segment having an optically active group and a segment imparting the property of undergoing nematic orientation; and a low molecular weight crosslinking agent having one or more (meth)acryloyl groups in the molecule.