Fast-crystallizing polyester compositions
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United States of America Patent
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Mar 22, 1994
Issued Date -
N/A
app pub date -
Jun 3, 1993
filing date -
Sep 27, 1991
priority date (Note) -
Expired
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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.
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