SUBSTITUTED DIPHENOXYALKANE-4,4'-BIS(SUCCINIC ANHYDRIDE), LINEAR POLYIMIDE AND PRODUCTION THEREOF

摘要

NEW MATERIAL:A compound expressed by formula I [X is H or OR1 (R1 is 1-4C alkyl); n is 1-5]. USE:A synthetic raw material for linear polyimide resin having excellent heat resistance, adhesion as well as transparence. PREPARATION:A substituted-4,4'-bis(beta-cyano)beta-alkoxycarbonylvinyl)diphenoxy alkane expressed by the formula II (R2 is 1-4C alkyl) is reacted with an alkali cyanide normally without catalyst to provide an addition compound, which is then hydrolyzed under acidic condition to afford a novel substituted diphenoxyalkane-4,4'-bis(succinic acid) expressed by formula III. The resultant compound is further boiled with acetic anhydride to give the aimed succinic anhydride expressed by formula I.