Polyesteramide and process for preparing the same

摘要

A polyesteramide having structural units of the general formula: <IMAGE> (I) wherein Ar is a bivalent aromatic group comprising at least 10% by mole of a group having the following formula: <IMAGE> in which R1, R2, R3 and R4 are the same or different and each is methyl group or ethyl group, and structural units of the general formula: <IMAGE> (II) wherein R is a bivalent organic group. At least 10% by mole of a bifunctional phenol compound to be used is a tetraalkylbisphenol-F, and whereby the obtained polyesteramide has improved hydrolysis resistance and electric characteristic with an excellent heat resistance.