Spandex of a particular composition and process for making same

Details Spandex of a particular composition and process for making same Spandex of a particular composition and process for making same

2006-01-10

2006-01-10

Gorr, Rachel (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C528S076000, C528S906000

Reexamination Certificate

active

06984708

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]benzenewherein 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; andfrom about 45 to about 65 mole percent 1,2-propanediamine.

REFERENCES:
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patent: 5362432 (1994-11-01), Houser et al.
patent: 5616676 (1997-04-01), Katsuo
patent: 5981686 (1999-11-01), Waldbauer, Jr.
patent: 6403216 (2002-06-01), Doi et al.
patent: 58194915 (1983-11-01), None
patent: 3279415 (1991-12-01), None

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