US 4,234,655 AGranted

Heat-adhesive composite fibers

AssigneeChisso Corporation

InventorsKohichi Kunimune, Teruaki Hane, Seigo Inadomi, Yasuhiko Furukawa

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Abstract

The heat-adhesive fine composite fibers of the present invention have a denier within the range of 1-20, and consist of as a first component, a crystalline polypropylene and as a second component, an ethylene-vinyl acetate copolymer, a saponification product thereof or a mixture of any of these materials with polyethylene, the content in said second component, of vinyl alcohol and/or vinyl acetate units based upon the total of vinyl acetate, vinyl alcohol and ethylene units being 0.5-18 mol %, and said second component forming at least one part of the fiber surface of said fibers. These fine composite fibers are superior in low temperature heat-adhesiveness, in adhesiveness with foreign raw materials, and in low crimpability. Further the fine composite fibers in which the second component has a specific density of 0.93 or less show almost no crimpability and are useful for wet-type non-woven fabrics. When a polypropylene having a Q value of 3.5 or less is used as the first component, the composit fiber can be obtained by spinning process alone with sufficient fiber strength, and the composite fibers having almost no sensible and latent crimping are very suitable for wet type non-woven fabrics.

Claims9

Dependent claims

Heat-adhesive composite fibers having a denier within the range of 1-20, and comprising

(a) a first component of crystalline polypropylene, and
(b) a second component selected from the group consisting of
(1) an ethylene-vinyl acetate copolymer,
(2) a saponification product thereof,
(3) a polymer mixture of an ethylene-vinyl acetate copolymer with polyethylene, and
(4) a polymer mixture of a saponification product of an ethylene-vinyl acetate copolymer with polyethylene,
said copolymer containing 0.5-18 mol % of vinyl acetate units based upon the total of vinyl acetate units and ethylene units,
said saponification product containing 0.5-18 mol % of vinyl monomer units consisting of vinyl alcohol units and vinyl acetate units based upon the total of vinyl alcohol units, vinyl acetate units and ethylene units,
said polymer mixtures consisting of 70% by weight or less of said copolymer or said saponification product and 30% by weight or more of said polyethylene,
said polymer mixtures containing 0.5-18 mol % of vinyl monomer units consisting of vinyl alcohol units and/or vinyl acetate units based upon the total of vinyl acetate units, vinyl alcohol units and ethylene units of the said polymer mixtures,
the composite ratio of said first component to said second component being in the range of 40:60 to 70:30,
said first and second components being joined together along an axially extending interface, and
said second component forming at least 50% of the exterior surface of the composite fibers continuously in the longitudinal direction of the fibers so as to give the composite fibers heat-adhesive properties.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/062,814Filed 1 Aug 1979 · continuation in part
Priority: JP 51-12572320 Oct 1976
Granted: 18 Nov 1980
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

D04H 1/54
From fleeces or layers composed of fibres without existing or potential cohesive properties: by welding together the fibres, e.g. by partially…
D01F 8/06
From synthetic polymers: with at least one polyolefin as constituent
D21H 5/20
Characterised by the use of special fibrous materials: of organic non-cellulosic fibres too short for spinning, with or without cellulose fibres
Y10T 428/249921
Stock material or miscellaneous articles: web or sheet containing structurally defined element or component