Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1982-03-05
1982-12-14
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524539, 525442, C08K 505, C08K 513
Patent
active
043638929
ABSTRACT:
A thermoplastic copolyester elastomer composition comprising a copolyester consisting essentially of a multiplicity of long-chain ester units and short-chain ester units joined through ester linkages, said long-chain ester units being represented by the formula (Ia), formula (Ib) and combinations thereof ##STR1## and said short-chain ester units being represented by formula (II) ##STR2## where G is a divalent radical remaining after the removal of hydroxyl groups from at least one long-chain glycol having a melting point of less than about 55.degree. C. and a number average molecular weight of about 400-4000, R is a divalent radical remaining after the removal of carboxyl groups from at least one dicarboxylic acid having a molecular weight less than about 300, R' is a divalent radical remaining after the removal of carboxyl groups from dimer acid, D is a divalent radical remaining after the removal of hydroxyl groups from at least one aliphatic diol having a molecular weight less than about 250, with the proviso that at least about 70 mole percent of the D radicals are either ethylene radicals or 1,4-butylene radicals and at least about 70 mole percent of the R radicals are 1,4-phenylene radicals, said short-chain ester units being present in an amount of about 15-95 percent by weight of said copolyester; and about 0.1-10 percent by weight, based on the weight of the total composition, of at least one alkali metal salt of a phenolic compound having a pK.sub.a 25.degree. greater than 5 and an equivalent weight of less than about 300 per phenolic hydroxyl group.
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E. I. Du Pont de Nemours and Company
Phynes Lucille M.
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