发明名称 |
PROCESS FOR MAKING HIGH DENIER FILAMENTS OF THERMOTROPIC LIQUID CRYSTALLINE POLYMERS AND COMPOSITIONS THEREOF |
摘要 |
The present invention discloses and claims a novel process for the formation of high denier as-spun and heat-treated filaments of a thermotropic liquid crystalline polymer. Preferred embodiments include process for the formation of as-spun and heat treated monofilaments of a few wholly aromatic polyesters and polyesteramides. The process involves (a) heating of a thermotropic liquid crystalline polymer to above its melting transition temperature; (b) passing said molten polymer through an extrusion chamber equipped with an extrusion capillary of an aspect ratio of greater than about 1 and less than about 15 to form a filament; and (c) winding the filament at a draw-down ratio of at least about 4. The filaments so formed are of at least 50 denier per filament (dpf) and feature essentially uniform molecular orientation across the crosssection. In a final optional step, the filaments are heat treated in stages to form filaments exhibiting excellent tensile properties. Both as-spun and heat-treated filaments feature remarkably good tensile properties retaining at least 80 to 90 percent of the properties expected of conventional low denier (5 to 10 dpf) filaments.
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申请公布号 |
CA2280627(A1) |
申请公布日期 |
2000.03.10 |
申请号 |
CA19992280627 |
申请日期 |
1999.08.17 |
申请人 |
CELANESE ACETATE LLC |
发明人 |
CORNETTA, JOHN EDWARD;FLINT, JOHN ANTHONY;JAFFE, MICHAEL J.;DIBIASE, JOSEPH J.;HAIDER, M. ISHAQ |
分类号 |
D01D7/00;D01D10/02;(IPC1-7):D01D7/00 |
主分类号 |
D01D7/00 |
代理机构 |
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