聚合物、液晶配向剂、液晶配向膜以及液晶显示元件;POLYMER, LIQUID CRYSTAL ALIGNMENT AGENT, LIQUID CRYSTAL ALIGNMENT FILM, AND LIQUID CRYSTAL DISPLAY

摘要

一种聚合物，包括由式1-1或式1-2表示的单元：；以及由式2表示的单元，，其中R1为四价有机基团，R2和R4分别为二价有机基团，R3为不同于>R1(OH)2的二价有机基团；式1-2表示的单元为由式1-1表示的单元脱水环化而得的单元。; R2and R4are, respectively, a divalent organic group; R3is a divalent linking group different from >R1(OH)2; the unit represented by the formula 1-2 is a unit obtained by the dehydration-cyclization of the unit represented by the formula 1-1.