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 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 RATION 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 FOMLED 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 |
MY124249(A) |
申请公布日期 |
2006.06.30 |
申请号 |
MY1999PI03877 |
申请日期 |
1999.09.08 |
申请人 |
CELANESE ACETATE LLC |
发明人 |
JOHN A. FLINT;MICHAEL J. JAFFE;M. ISHAQ HAIDER;JOSEPH J. DIBIASE;JOHN E. CORNETTA |
分类号 |
B32B9/00;D01F6/62;D01D5/08;D01F6/60;D01F6/82;D01F6/84;D02J13/00 |
主分类号 |
B32B9/00 |
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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