Azobenzene-based photoactive polymer material, a process for producing the same, and a process for producing a polymer liquid crystal alignment film using the same

摘要

The present invention relates to a photofunctional polymer material, a method for producing the same, and a method for producing a polymer alignment film for a liquid crystal display using the same. The reaction product obtained by reacting a diamino azobenzene compound with a tetracarboxylic acid anhydride is purified and dried An azo polyamic acid represented by the following formula (1), which is a photo functional polymer, is dissolved in an organic solvent, coated on a substrate, exposed to polarized ultraviolet rays, re-oriented, and heat treated to prepare an azopolyimide A polymer alignment layer for a liquid crystal display capable of adjusting a pretilt angle within a desired range without causing a problem that may be caused by rubbing can be manufactured by preparing a polymer alignment layer by drying the polymer alignment layer.;In this formula,;R is C_9-18Alkyl group,;a is from 0.05 to 0.7, b is from 0.3 to 0.95, a + b is 1,;X is;Y is;n is an integer of 2 or more.