Non-linear phosphazene polymer having schiff base structures, process for the preparation thereof, and curable phosphazene composition

摘要

A novel phosphazene polymer having Schiff base structures is disclosed. The polymer is a condensation reaction product of a cyclic phosphonitrilic compound represented by the general formula (I): ##STR1## (wherein n is an integer 3 or 4, and 2n A's are independently selected from a group consisting of a formylphenoxy group, a phenoxy group, an alkylphenoxy group, a halogenated phenoxy group, an N-aromatic azomethine- phenoxy group, and a fluoroalkoxy group, provided more than 2 formylphenoxy groups being contained per molecule on the average) and a primary diamine or a primary polyamine, The polymer contains Schiff base bonds derived from formylphenoxy groups and amines and is represented by the formula: ##STR2## (wherein Z is a residual group said primary diamine or primary polyamine and may have bonds other than those indicated). The polymer exhibits a 20% or less weight loss under thermobalance analysis at 400 C. and has a glass transition teperature (Tg) of 120. degree. C. or higher.