Bicomponent fiber and yarn comprising same

Details Bicomponent fiber and yarn comprising same Bicomponent fiber and yarn comprising same

2007-03-27

2007-03-27

Edwards, N. (Department: 1774)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

C428S374000, C428S370000, C428S359000

Reexamination Certificate

active

10830700

ABSTRACT:
The invention provides a bicomponent staple fiber comprising poly(ethylene terephthalate) and poly(trimethylene terephthalate) wherein the bicomponent fiber has a substantially oval cross-section shape having an aspect ratio A:B of about 2:1 to about 5:1 wherein A is a fiber cross-section major axis length and B is a fiber cross-section minor axis length, a polymer interface substantially perpendicular to the major axis, a cross-section configuration selected from the group consisting of side-by-side and eccentric sheath-core, a tenacity at 10% elongation of about 1.1 cN/dtex to about 3.5 cN/dtex, a free-fiber length retention of about 40% to about 85%, and a tow crimp development value of about 30 to 55%, and a spun yarn comprising the bicomponent staple fiber.

REFERENCES:
patent: 3671379 (1972-06-01), Evans et al.
patent: 6656586 (2003-12-01), Hartzog et al.
patent: 6673443 (2004-01-01), Koyanagi et al.
patent: 2003/0056553 (2003-03-01), Hamazaki et al.
patent: 2003/0108740 (2003-06-01), Koyanagi et al.
patent: 2003/0159423 (2003-08-01), Hietpas et al.
patent: 2004/0067707 (2004-04-01), Hamilton et al.
patent: 2002-115149 (2002-04-01), None
patent: 2002-180332 (2002-06-01), None
patent: 2002-180333 (2002-06-01), None

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