Spandex of a particular composition and process for making same
OwnerHong Liu, Gregory Yoder +1inventors
InventorsHong Liu, Gregory Yoder, Robert Waldbauer
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Abstract
The invention provides spandex having improved hysteresis and a method for making such spandex. The spandex of the invention comprises the polyurethaneurea reaction product of: (a) poly(tetramethylene ether) glycol (b) 1-isocyanato-4-[(4-isocyanatophenyl)methyl]benzene wherein the mole ratio of diisocyanate to glycol is from about 1.52 to about 2.04; and (c) a mixture of chain extenders comprising: from about 35 to about 55 mole percent ethylene diamine; and from about 45 to about 65 mole percent 1,2-propanediamine.
Claims7
1-4. (canceled)
A process for making spandex comprising the steps of:
- a) providing poly(tetramethylene ether) glycol;
- b) providing 1-isocyanato-4-[(4-isocyanatophenyl)methyl]benzene;
- c) contacting the poly(tetramethylene ether) glycol and the 1-isocyanato-4-[(4-isocyanatophenyl)methyl]benzene to form a capped glycol wherein the weight percent of isocyanate moiety is from about 2.2 to about 2.9 based upon the weight of the capped glycol;
- d) providing a solvent;
- e) mixing the solvent and the capped glycol to form a capped glycol solution;
- f) contacting the capped glycol solution and a mixture of chain extenders comprising:
- from about 35 mole percent ethylene diamine;
- to about 55 mole percent ethylene diamine;
- and
- from about 45 mole percent 1,2-propanediamine;
- to about 65 mole percent 1,2-propanediamine
- to form a polyurethaneurea solution;
- and
- g) spinning the polyurethaneurea solution to form the spandex.
(canceled)
Dependencies are inferred from the claim text.