Ultrafine sheath-core composite fibers and composite sheets made

Details Ultrafine sheath-core composite fibers and composite sheets made Ultrafine sheath-core composite fibers and composite sheets made

1984-12-06

1985-12-10

Lesmes, George F.

Stock material or miscellaneous articles

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

Rod, strand, filament or fiber

428397, 428903, 264171, D02G 300, B29F 310

Patent

active

045579725

ABSTRACT:
Improved ultrafine sheath-core composite fibers and composite sheets composed of these fibers are disclosed. The composite fibers have a fineness in the range of 0.0001 to 0.5 denier and a core/sheath weight ratio in the range of 10/90 to 70/30. The core has a very high intrinsic viscosity within a specific range and is located at the center of the sheath. The sheath is composed of a polyester copolymerized with 1.5 to 8 mole % of 5-sodium (or lithium or potassium) sulfoisophthalate, based on the total acid component, of 5-sodium (or lithium or potassium) sulfoisophthalate and having a thickness of 0.04 to 2 microns. The composite fibers have a high strength and are dyeable with a cationic dye. When the composite fibers are combined with an elastic material such as polyurethane, suede-like artificial leathers having excellent softness, touch, feel and color can be obtained.

REFERENCES:
patent: 4059949 (1977-11-01), Lee
patent: 4073988 (1978-02-01), Nishida et al.
patent: 4381335 (1983-04-01), Okamoto

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