High temperature stable polyetherimides from oxydiphthalic dianhydride and a mixture of m- and p-phenylene diamines and diaminodiphenyl ether

摘要

Polyetherimides are prepared from at least two diamines selected from the group consisting of o-phenylenediamine, m- phenylenediamine and 4- aminophenyl ether and a dicarboxyphenyl ether anhydride, or the esterification product thereof with a low molecular weight alkanol such as methanol. 3,4-Dicarboxyphenyl ether dianhydride is preferred. Said polyimides are tough, flexible and stable at high temperatures.