Fast-crystallizing polyester compositions
AssigneesIstituto Guido Donegani S.p.A., Enichem Synthesis S.p.A.
InventorsJohn W. Gilmer, Gianluigi Landoni
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Abstract
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.
Claims13
A method for accelerating polyester crystallization comprising the steps:
- mixing a thermoplastic polyester resin and an effective amount of a nucleating agent of the formula:
- ##STR3## wherein:
- R is an alkali or alkaline-earth metal;
- m is 1, 2 or 3;
- n takes an average value within the range of 2 to 5;
- said nucleating agent being optionally admixed with the compound of formula (I) wherein R is a hydrogen atom, linear alkyl radical or branched alkyl radical having from 1 to 6 carbon atoms;
- with the proviso that at least 50 mole % of said nucleating agent is in the salt form.
Dependencies are inferred from the claim text.