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US 4,120,850 AGranted
Polyether urethane polymers prepared from a copolymer of tetrahydrofuran and ethylene oxide
AssigneeE. I. Du Pont de Nemours and Company
InventorEngelbert Pechhold
Life of this patent
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Abstract
A polyether urethane polymer which is the reaction product of (a) a difunctional copolymer of tetrahydrofuran and ethylene oxide or propylene oxide; (b) an organic diisocyanate; and (c) an aliphatic diol of 2 to 10 carbon atoms; Useful as an elastomer.
Claims9
A polyether urethane polymer which is the reaction product of
- (a) a copolymer of tetrahydrofuran and ethylene oxide or propylene oxide, the copolymer containing about 20% to about 70%, by weight, of ethylene oxide or propylene oxide units and having a number average molecular weight of about 550 to about 3,000 and a hydroxyl functionality of 2.0;
- (b) an organic diisocynate;
- and
- (c) 1,4-butanediol or hydroquinone bis(betahydroxyethyl)ether.
1 more element
A polyether urethane polymer which is the reaction product of
- (a) a copolymer of tetrahydrofuran and ethylene oxide, the copolymer containing about 35% to about 50%, by weight, of ethylene oxide units and having a number average molecular weight of about 650 to about 1,000 and a hydroxyl functionality of 2.0;
- (b) diphenylmethane-4,4'-diisocyanate;
- and
- (c) 1,4-butanediol.
1 more element
A process for preparing a polyether urethane polymer, the process comprising
- (a) bringing together, under conditions suitable for reaction,
- (1) a copolymer of tetrahydrofuran and ethylene oxide or propylene oxide, the copolymer containing about 20% to about 70%, by weight, of ethylene oxide or propylene oxide units and having a number average molecular weight of about 550 to about 3,000 and a hydroxyl functionality of 2.0;
- and
- (2) a stoichiometric excess of an organic diisocyanate, to form a prepolymer;
- and then
- (b) bringing together, under conditions suitable for reaction, the prepolymer product of (a) and an amount of 1,4-butanediol or hydroquinone bis(betahydroxyethyl)ether calculated to give an isocyanate/hydroxyl mole ratio in the reaction mass of about 0.9-1.1 to 1.
3 more elements
Dependencies are inferred from the claim text.