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High-uniformity spandex and process for making spandex

  • US 6,503,996 B1
  • Filed: 11/14/2001
  • Issued: 01/07/2003
  • Est. Priority Date: 11/14/2001
  • Status: Expired due to Term
First Claim
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1. Spandex comprising a polyurethaneurea which is the reaction product of:

  • a) a capped glycol comprising the reaction product of;

    i) a polymeric glycol selected from the group consisting of polyether glycols, polyester glycols, and polycarbonate glycols;

    ii) a diisocyanate; and

    iii) an aliphatic primary monoalcohol comprising 1-10 carbons;

    b) an aliphatic diamine chain extender comprising 2-12 carbons; and

    c) a primary aliphatic monoamine chain terminator comprising 5-12 carbons;

    wherein the polyurethaneurea has;

    monoalkylurea ends and alkylurethane ends;

    a ratio of monoalkylurea ends to alkylurethane ends of at least about 0.5;

    1; and

    a ratio of monoalkylurea ends to alkyurethane ends of at most about 10;

    1; and

    wherein the spandex has a coefficient of denier variation which is lower, by at least about 15%, than that of spandex comprising an otherwise identical polyurethaneurea having dialkylurea and amine ends.

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