Method for producing a shaped multifilament,...

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

Reexamination Certificate

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Details

C156S167000, C156S296000, C156S309900, C156S322000, C264S210800

Reexamination Certificate

active

06248197

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a method for fabricating multifilament elastomeric yarns from elastomeric polymers, and especially to a method for fabricating said elastomeric yarn in which the surface and the cross-sectional shapes have been stably modified.
DESCRIPTION OF THE PRIOR ART
Japanese Published Unexamined Patent Application No. 53-139,847 (1978) proposes a melt-spinning method in which a thermoplastic polyurethane multifilament is fused during spinning so as to unite in the lengthwise direction a plurality of filaments and thereby form a monofilament. Japanese Published Unexamined Patent Application No. 7-197,318 (1995) proposes a method in which filaments of modified cross-section are produced by dry-spinning polyurethane, in which process spinning is carried out with a spinneret having a modified shape. However, in these prior art methods, the multifilament is fused into a monofilament during spinning. Moreover, no intention or suggestion whatsoever is expressed regarding modification of the cross-section of a coalesced elastomeric multifilament yarn.
SUMMARY OF THE INVENTION
The present invention provides a method for pressing a coalesced multifilament elastomeric yarn, and of producing multifilament elastomeric yarn in which the cross-sectional shape and surface have been modified.
The multifilament elastomeric yarn production method of the present invention is characterized by bundling and hot-pressing coalesced elastomeric multifilaments so as to modify the cross-sectional shape and optionally the surface of said multifilaments.
One or more types of elastomeric polymer can be selected from among synthetic rubbers, polyolefin elastomers, polyester elastomers and polyurethanes, although polyurethanes in particular are generally preferred in elastomeric yarns. Filaments of substantially round cross-section is generally coalesced during spinning to form a coalesced multifilament elastomeric yarn. The inventors found that, when such yarn is hot-pressed and shaped, for example flattened, high-quality, fashionable fabric that is truly soft and has a good hand can be produced from such modified yarn.


REFERENCES:
patent: 3690978 (1972-09-01), Nishizawa et al.
patent: 3777470 (1973-12-01), Suzuki et al.
patent: 5000899 (1991-03-01), Dreibelbis et al.
patent: 5362433 (1994-11-01), Toscan et al.
patent: 5387387 (1995-02-01), James et al.
patent: 53-139847 (1978-12-01), None
patent: 4-174717 (1992-06-01), None
patent: 7-197318 (1993-12-01), None
patent: 97A96090 (1996-07-01), None

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