POLYAMIC ACID AND PRODUCTION OF IMIDE POLYMER,申请号JP19960039322-传众专利搜索

POLYAMIC ACID AND PRODUCTION OF IMIDE POLYMER

申请公布号：JPH09227678(A)

申请号：JP19960039322

申请日期：1996.02.27

申请公布日期：1997.09.02

申请人：

JAPAN SYNTHETIC RUBBER CO LTD

发明人：YASUDA YOSHITOMO;TOYOSHIMA TSUKASA;MATSUKI YASUO;HIRAHARU AKIO

分类号：G02F1/1337;C08G73/10;(IPC1-7):C08G73/10;G02F1/133

主分类号：G02F1/1337

摘要：PROBLEM TO BE SOLVED: To produce an imide polymer which can form a liquid crystal alignment film having excellent aligning characteristics and which can give liquid crystal displays shortened in the time taken for residual image extinction by reacting a specified tetracarboxylic dianhydride with a specified diamine compound. SOLUTION: 1,3-Divinylbenzene and/or 1,4-divinylbenzene and maleic anhydride are subjected to the Diels-Alder reaction at 80-150 deg.C to obtain a tetracarboxylic dianhydride. A tetracarboxylic dianhydride containing 0.1-100mol% obtained dianhydride is reacted with a diamine compound represented by the formula: H2 N-R<1> -NH2 (wherein R<1> is a divalent organic group) in such a ratio that 0.2-2.0 equivalents of the acid anhydride groups of the tetracarboxylic dianhydride are present per equivalent of the amino groups of the diamine compound at 0-150 deg.C in an organic solvent to obtain a polyamic acid. This acid is cyclized through dehydration at 0-180 deg.C in the presence of a dehydrating agent and a dehydrative cyclization catalyst in an organic solvent to obtain an imide polymer.