Alignment film for liquid crystal, liquid crystal-sandwiched panel, liquid crystal display module and material for liquid crystal alignment film

摘要

An alignment film for liquid crystal is provided which comprises a polyimide comprising a repeating unit of the general formula (I): ##STR1## wherein n is an integer of from 2 to 16 and R.sup.1 represents a divalent organic group. This polyimide is obtained for example, from a reaction between ethylene glycol bis(trimellitate dianhydride) and 4,4'- diaminodiphenyl ether. This polyimide or a varnish of a precursor thereof is coated on a plate, and dried to obtain an alignment film for liquid crystal, which stably exhibits a high pretilt angle, irrespective of curing temperatures. The present invention further provides a liquid crystal-sandwiched panel and a liquid crystal display module prepared using the alignment film as well as a material for the preparation of the alignment film.