Plastic and nonmetallic article shaping or treating: processes – With twining – plying – braiding – or textile fabric formation
Reexamination Certificate
2007-11-09
2011-11-08
Tentoni, Leo B (Department: 1742)
Plastic and nonmetallic article shaping or treating: processes
With twining, plying, braiding, or textile fabric formation
C264S17800F, C264S180000, C264S203000, C264S210700, C264S210800, C264S211150, C264S211160, C264S211170, C264S234000
Reexamination Certificate
active
08052905
ABSTRACT:
A process for the preparation of polymer yarns from ultra high molecular weight homopolymers or copolymers, wherein the process includes the following steps:(a) preparing a suspension of a homopolymer or copolymer and a spinning or gelling solvent of a non polar nature at a weight of homopolymer or copolymer to solvent ratio from 2/98 to 30/70, wherein said ultra high molecular weight homopolymer or copolymer is reactor bimodal or multimodal;(b) feeding said homopolymer or copolymer suspension to an extruder;(c) extruding said suspension under gel forming conditions, at a temperature in excess of 150° C., and under inert conditions;(d) spinning the gel obtained from the extrusion so as to obtain non-stretched filaments with diameters of at least 1 mm, at a temperature in excess of 150° C., while maintaining the inert conditions;(e) cooling the non-stretched filament bundles;(f) treating said non-stretched yarn with a second extraction solvent;(g) drying the non-stretched yarn and(h) stretching the dry yarn.
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Beckedorf Martha de La Rue
Da Cunha Fernanda Oliveira Vieira
De La Rue Breno
Do Nascimento Alan Kardec
Birch & Stewart Kolasch & Birch, LLP
Braskem S.A.
Tentoni Leo B
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