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US 6,639,041 B2Granted
Spandex having low set at low temperatures
AssigneeDuPont-Toray Co. Ltd.
InventorsHiroshi Nishikawa, Masao Umezawa
Life of this patent
Estimating the term…
Abstract
A low set (at low temperatures) spandex, based on copoly(alkylene ethers), which are copolymers containing tetramethylene ether and either ethylene ether or 1,2-propylene ether moieties, is provided.
Claims10
Spandex comprising a polyurethane reaction product of:
- (A) a copoly(alkylene ether) glycol selected from the group consisting of poly(tetramethylene-co-ethylene ether) glycols wherein the ethylene ether moiety is present at a level of about 15-37 mole % and poly(tetramethylene-co-1,2-propyleneether) glycols wherein the 1,2-propylene ether moiety is present at a level of about 15-30 mole %, based on total alkylene ether moieties;
- (B) a diisocyanate;
- and
- (C) a chain extender selected from the group consisting of diamines and diols.
1 more element
A process for preparing spandex comprising the steps of:
- (A) contacting a copoly(alkylene ether) glycol selected from the group consisting of poly(tetramethylene-co-ethylene ether) glycols wherein the ethylene ether moiety is present at a level of about 15-37 mole % and poly(tetramethylene-co-1,2-propyleneether) glycols, wherein the 1,2-propylene ether moiety is present at a level of about 15-30 mole %, based on total alkylene ether moieties with a diisocyanate to form a capped glycol;
- (B) dissolving the capped glycol in a solvent;
- (C) contacting the solution of the capped glycol formed in step (B) with a chain extender selected from the group consisting of diamines and diols to form a polyurethane pinning solution;
- and
- (D) spinning the solution formed in step (C) to form the spandex.
2 more elements
Dependencies are inferred from the claim text.