发明名称 |
Process for direct on-bobbin heat treating of high denier filaments of thermotropic liquid crystalline polymers |
摘要 |
<p>The present invention discloses and claims a novel process for the heat treatment of high denier filaments of a thermotropic liquid crystalline polymer. Preferred embodiments include process for the formation of heat treated filaments 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; (c) winding the filament on to a bobbin at a low tension and draw-down ratio of at least about 4; and (d) heat treating the filament directly on the bobbin at suitable temperature and pressure conditions for a sufficient period of time. The filaments so formed are of at least 50 denier per filament (dpf) and feature essentially uniform molecular orientation across the cross-section. The 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.</p> |
申请公布号 |
EP0985749(A2) |
申请公布日期 |
2000.03.15 |
申请号 |
EP19990114456 |
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 |
D01D10/02;D01F6/60;D01F6/62;D01F6/82;D01F6/84;D02J13/00;(IPC1-7):D01F6/62 |
主分类号 |
D01D10/02 |
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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