Thermoplastic copolyetherester elastomers
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobin N. Greene, George R. Goodley, Charles King
Life of this patent
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Abstract
A segmented thermoplastic copolyetherester having soft segments formed from a long chain polyalkyleneether glycol containing 80 to 97 mole percent of copolymerized tetrahydrofuran and 3 to 20 mole percent of a copolymerized cyclic alkylene oxide, preferably copolymerized 3-methyltetrahydrofuran, provides fibers and films with an improved combination of high tenacity, high unload power, high melting temperatures and low set.
Claims16
A thermoplastic, segmented, linear copolyetherester elastomer which consists essentially of a multiplicity of recurring intralinear long-chain and short-chain ester units connected head-to-tail through ester linkages, the long-chain ester units amounting to 70 to 90 weight percent of the elastomer and being represented by the structure ##STR3## and the short-chain ester units amounting to 10 to 30 weight percent of the elastomer being represented by the structure ##STR4## wherein R represents a divalent radical remaining after removal of carboxyl groups from a dicarboxylic acid selected from the group consisting of terephthalic acid and 2,6-naphthalenedicarboxylic acid,
- G represents a divalent radical remaining after removal of hydroxyl groups from a long chain polyalkyleneether glycol containing 80 to 97 mole percent of copolymerized tetrahydrofuran and 3 to 20 mole percent of a copolymerized cyclic alkylene oxide having 2, 3 or 4 carbon atoms and an n-alkyl substituent of 1 to 2 carbon atoms attached to one of the carbon atoms of the cyclic alkylene oxide and has a number average molecular weight in the range of 1,500 to 5,000 and
- D is a divalent radical remaining after removal of terminal hydroxyl groups from a diol selected from the the group consisting of ethylene glycol and 1,4-butane diol.
Dependencies are inferred from the claim text.