Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,...
Reexamination Certificate
2004-12-23
2009-11-17
Edwards, N. (Department: 1794)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
C428S364000, C428S394000
Reexamination Certificate
active
07618706
ABSTRACT:
The invention relates to a process for making high-performance polyethylene multi-filament yarn comprising the steps of a) making a solution of ultra-high molar mass polyethylene in a solvent; b) spinning of the solution through a spinplate containing at least 5 spinholes into an air-gap to form fluid filaments, while applying a draw ratio DRfluid; c) cooling the fluid filaments to form solvent-containing gel filaments; d) removing at least partly the solvent from the filaments; and e) drawing the filaments in at least one step before, during and/or after said solvent removing, while applying a draw ratio DRsolidof at least 4, wherein in step b) each spinhole comprises a contraction zone of specific dimension and a downstream zone of diameter Dnand length Dnwith Ln/Dnof from 0 to at most 25, to result in a draw ratio DRfluid=DRsp*DRagof at least 150, wherein DRspis the draw ratio in the spinholes and DRagis the draw ratio in the air-gap, with DRspbeing greater than 1 and DRagat least 1. The invention further relates to a high-performance polyethylene multifilament yarn, and to semi-finished or end-use products containing said yarn, especially to ropes and ballistic-resistant composites.
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International Search Report.
Jacobs Martinus Johannes Nicolaas
Marissen Roeloef
Mencke Jacobus Johannes
Simmelink Joseph Arnold Paul Maria
DSM IP Assets B.V.
Edwards N.
Nixon & Vanderhye P.C.
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