发明名称 |
Verfahren zur Herstellung von Hochdenier-Filamenten aus thermotropischen Flüssigkristallpolymeren |
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 cross-section. 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. |
申请公布号 |
DE69921410(D1) |
申请公布日期 |
2004.12.02 |
申请号 |
DE1999621410 |
申请日期 |
1999.07.23 |
申请人 |
CELANESE ACETATE, LLC. |
发明人 |
FLINT, JOHN A.;JAFFE, MICHAEL;HAIDER, ISHAQ M.;DIBIASE, JOSEPH J.;CORNETTA, JOHN E. |
分类号 |
D01F6/62;D01D5/08;D01F6/60;D01F6/82;D01F6/84;D02J13/00;(IPC1-7):D01F6/62 |
主分类号 |
D01F6/62 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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