Enichem S.p.a

Enichem Synthesis S.p.a

Istituto Guido Donegani S.p.a.

John W Gilmer

Gianluigi Landoni

Molding compositions of thermoplastic polyesters and polymeric nucleating additives having pendant ionizable alkali metal phenolate groups. A process for increasing the crystallization rate and crystallization temperature of thermoplastic polyesters by incorporating into the polyesters the polymeric nucleating additives of the present invention.

Rapidly crystallizing polyester molding compositions

The present invention relates to fast-crystallizing polyester compositions comprising: (a) a thermoplastic polyester resin; (b) a nucleating agent of the formula: ##STR1## wherein: R is an alkali or alkaline-earth metal; m is 1, 2 or 3; n takes an average value within the range of 1 to 5; said nucleating agent being optionally admixed with the compound of formula (I) wherein R is a hydrogen atom, linear alkyl radial or branched alkyl radical each having from 1 to 6 carbon atoms; with the proviso that at least 50% mole of said nucleating agent is in the salt form. This nucleating additive raises the crystallization temperature upon cooling (T.sub.cc) of the polyester so that crystallization occurs rapidly during molding.

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West Windsor, NJ, United States of America

John W Gilmer