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Process for making load limiting yarn

  • US 6,228,488 B1
  • Filed: 05/22/1998
  • Issued: 05/08/2001
  • Est. Priority Date: 05/22/1998
  • Status: Expired due to Fees
First Claim
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1. Yarn having a force-displacement profile such that:

  • (a) when said yarn is subjected to an initial stress barrier of from about 0.8 gram/denier to less than or equal to about 1.2 grams/denier, said yarn elongates to less than 5 percent and has an initial modulus in the range from about 30 grams/denier to about 80 grams/denier;

    (b) upon subjecting said yarn to greater than said initial stress barrier and to less than or equal to about 1.5 grams/denier, said yarn elongates further to at least about 8 percent; and

    (c) upon subjecting said yarn to greater than 1.5 grams/denier, the modulus increases sharply and said yarn elongates further until said yarn breaks at a tensile strength of at least about 6 grams/denier, wherein said yarn comprises a multiplicity of fibers, all of said fibers have substantially the same force-displacement profile, and are made from polymers having a glass transition temperature in the range from about −

    40°

    C. to about +70°

    C.

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