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US 6,472,494 B2Granted
Spandex with high heat-set efficiency
AssigneeE. I. Du Pont de Nemours and Company
InventorsNathan E Houser, Gordon W Selling
Life of this patent
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Abstract
A high heat-set efficiency, high unload power spandex, based on a polyurethaneurea prepared from a polyether glycol, mixtures of 2,4′-MDI and 4,4′-MDI, and chain extenders, is provided.
Claims9
Spandex having a heat-set efficiency at approximately 175-190° C. of ≧85%, consisting essentially of the reaction product of:
- (A) poly(tetramethyleneether-co-2-methyltetramethyleneether) glycol;
- (B) a mixture of 1-isocyanato-4-[(4′-isocyanatophenyl)methyl]benzene and 23-55 mole %, based on total diisocyanate, of 1-isocyanato-2-[(4′-isocyanatophenyl)methyl]benzene;
- and
- (C) at least one chain extender.
1 more element
A method of making spandex having a heat-set efficiency at approximately 175-190° C. of ≧85%, comprising the steps of:
- (A) contacting poly(tetramethyleneether-co-2-methyltetramethyleneether) with a mixture of 1-isocyanato-4-[(4′-isocyanatophenyl)methyl]benzene and 23-55 mole %, based on total diisocyanate, of 1-isocyanato-2-[(4′-isocyanatophenyl)methyl]benzene to form a product containing approximately 2.4-4.6 weight % NCO moiety;
- (B) adding a solvent to the product of step (A);
- (C) contacting the product of step (B) with at least one chain extender;
- and
- (D) spinning the product of step (C) to form spandex.
2 more elements
Dependencies are inferred from the claim text.