PHOTOACTIVE POLYIMIDES, POLYAMIDE ACIDS OR ESTERS WITH SIDE CHAIN PHOTOCROSSLINKABLE GROUPS

摘要

A photoactive polymer from the class of polyimides, polyamide acids and esters thereof comprises as a side-chain a photocrosslinkable group of the general formula (I)wherein the broken line indicates the point of linkage to the polyimide main chain and wherein: B is a straight-chain or branched alkyl residue which is optionally substituted, wherein one or more non-adjacent CH2 groups may independently be replaced by a group Q; D represents an oxygen atom or -NR<1>- wherein R<1 >represents a hydrogen atom or lower alkyl; and S<3 >represents a spacer unit. The polymers may be used as orientation layers for liquid crystals and in the construction of unstructured and structured optical elements and multi-layer systems.