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121. 发明专利

DE69007425T2 未知
公开(公告)号：DE69007425T2
公开(公告)日：1994-07-28
申请号：DE69007425
申请日：1990-11-09
申请人： DU PONT
发明人： CHIOU MINSHON J
IPC分类号： C08G69/32 , D01F6/60 , D02G3/48
摘要： Fiber made from PPD-T with 0.5 to 3.0% sulfur as bound sulfonic acid or sulfonate groups, is disclosed. The fiber has inherent viscosity greater than 4.5, yarn tenacity greater than 20 grams per denier, heat-aged strength retention of greater than 90%, and dipped cord strength greater than 18 gram per denier. The process for making the fiber includes PPD-T sulfonation by exposure to high concentration sulfuric acid in dope preparation under carefully controlled temperature and time.

122. 发明专利

DE69007425D1 未知
公开(公告)号：DE69007425D1
公开(公告)日：1994-04-21
申请号：DE69007425
申请日：1990-11-09
申请人： DU PONT
发明人： CHIOU MINSHON J
IPC分类号： C08G69/32 , D01F6/60 , D02G3/48
摘要： Fiber made from PPD-T with 0.5 to 3.0% sulfur as bound sulfonic acid or sulfonate groups, is disclosed. The fiber has inherent viscosity greater than 4.5, yarn tenacity greater than 20 grams per denier, heat-aged strength retention of greater than 90%, and dipped cord strength greater than 18 gram per denier. The process for making the fiber includes PPD-T sulfonation by exposure to high concentration sulfuric acid in dope preparation under carefully controlled temperature and time.

123. 发明专利

CA2037448A1 PROCESS FOR SPINNING HIGH-STRENGTH HIGH-MODULUS AROMATIC POLYAMIDES 未知
公开(公告)号：CA2037448A1
公开(公告)日：1991-09-27
申请号：CA2037448
申请日：1991-03-01
申请人： DU PONT
发明人： CHIOU MINSHON J
IPC分类号： D01D5/06 , D01D5/14 , D01F6/60
摘要： TITLE Process for Spinning High-Strength, High-Modulus Aromatic Polyamides A process for spinning high-strength, high-modulus, aromatic polyamide filaments is disclosed in which an acid solution containing at least 30 g per 100 ml acid of aromatic polyamide having an inherent viscosity of at least 4 and chain extending bonds which are either coaxial or parallel and oppositely directed is extruded through a layer of inert noncoagulating fluid into a coagulating bath and then through a spin tube along with overflowing coagulating liquid. Additional coagulating liquid is jetted symmetrically about the filaments in a downward direction forming an angle of 0.degree.C to 85.degree. with respect to the filaments within about 2.0 milliseconds from the time the filaments enter the spin tube. The flow rates of the jetted and the overflowing coagulating liquids are maintained constant. In the process, the mass-flow ratio, i.e., the ratio of the mass-flow rate of combined coagulating liquid to mass-flow rate of the filaments, greater than about 250, preferably greater than about 300, and the momentum ratio of jetted to overflowing coagulating liquids of greater than about 6.0 is employed. Also, the average linear velocity of combined coagulating liquids in the spin tube is less than the velocity of the filaments exiting from the spin tube. Doc. P.12 KB-3380

124. 发明专利

AU3087189A POLY(P-PHENYLENETERPHTHALAMIDE) YARNS OF IMPROVED FATIGUE RESISTANCE AND PROCESS FOR PREPARATION THEREOF 未知
公开(公告)号：AU3087189A
公开(公告)日：1989-09-07
申请号：AU3087189
申请日：1989-03-02
申请人： DU PONT
发明人： YANG HUNG HAN , CHIOU MINSHON J
IPC分类号： D01F6/60

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