Process for the preparation of polymer yarns from ultra high...

Plastic and nonmetallic article shaping or treating: processes – With twining – plying – braiding – or textile fabric formation

Reexamination Certificate

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C264S17800F, C264S180000, C264S203000, C264S210700, C264S210800, C264S211150, C264S211160, C264S211170, C264S234000

Reexamination Certificate

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08003027

ABSTRACT:
A process for the preparation of polymer yarns from ultra high molecular weight homopolymers or copolymers which includes the steps of preparing a suspension of a homopolymer or copolymer and a spinning or gelling solvent, extruding the suspension with the formation of a gel, spinning the gel to obtain non-stretched filaments or yarns, cooling the non-stretched filaments or yarns, feeding the non-stretched filaments or yarns, to an extractor together with the feed of an organic extraction solvent, extracting the non-polar long chain solvent impregnated in the yarns, drying the non-stretched filament bundles or yarns, and stretching said dry yarns at a temperature in excess of 80° C.

REFERENCES:
patent: 3671542 (1972-06-01), Kwolek
patent: 3822333 (1974-07-01), Haruta et al.
patent: 4129629 (1978-12-01), Gordon
patent: 4663101 (1987-05-01), Kavesh et al.
patent: 6063866 (2000-05-01), Wang et al.
patent: 7147807 (2006-12-01), Kavesh
patent: 2006/0079656 (2006-04-01), DesLauriers et al.

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