Potentially elastic conjugate fiber, production thereof, and production of fibrous structure with elasticity in expansion and contraction
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United States of America Patent
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-
May 3, 1994
Grant Date -
N/A
app pub date -
Jan 13, 1993
filing date -
May 14, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A potentially elastic composite filament, preferably a core-sheath composite filament composed of a polyurethane as the core and a polyester as the sheath, wherein the ratio of a polyurethane component having allophanate cross-linkages to a linear polyester component readily soluble in water or an aqueous alkali solution ranges from 1/1 to 90/1 and the polyester component is exposed on the surface of the filament in its cross-section. Although the core component has a high tensile strength and a large elongation at break, these properties are controlled by the sheath component. Therefore, this filament can be formed into a textile structure with good workability similar to that of ordinary synthetic fibers, and the obtained structure develops characteristics as an elastic polyurethane filament when treated with water or alkali.
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