COPOLYESTERIMIDES DERIVED FROM N,N'-BIS-(HYDROXYALKYL)-3,3',4,4'-DIPHENYLSULFONETETRACARBOXYLIC DIIMIDE AND FILMS MADE THEREFROM

摘要

A copolyester which comprises repeating units derived from an aliphatic glycol, terephthalic acid, and the monomer of formula (I): wherein n = 2, 3 or 4, Z is C=O , and wherein comonomer (I) constitutes a proportion of the glycol fraction of the copolyester and is present in an amount of from about 5 mol% to about 15 mol% of the glycol fraction of the copolyester; wherein said copolyester is semi-crystalline.