摘要：

1. A polymeric copolyester of (1) a phthalic acid comprising 50 to 100 mole percent isophthalic acid and '50 to 0 mole percent terephthalic acid, (2) a his (hydroxyphenyl)alkane wherein the phenyl nucleus has from 0 to 2 lower alkyl substit-uents and the alkane group contains from 1 to 5 carbon atoms, and (3) a diphenolic acid in an amount of from 1 to 15 mole percent based on the total moles of bis(hydroxyphenyl)alkane and diphenolic acid, said diphenolic acid having the formula OH OH COOH where nis one of the integers 0, l, 2, each R is a lower alkyl radical, R is an alkyl radical, R is an alkylene radical containing at least two carbon atoms and the hydroxyl group is in the para position when n is 0.

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