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    • 5. 发明授权
    • Melt processable thermotropic wholly aromatic polyester
    • 熔融加工热性全芳族聚酯
    • US4083829A
    • 1978-04-11
    • US789374
    • 1977-04-20
    • Gordon W. CalundannHerbert L. DavisFrederick J. GormanRobert M. Mininni
    • Gordon W. CalundannHerbert L. DavisFrederick J. GormanRobert M. Mininni
    • C08G63/60D01F6/84C08G63/06C08G63/18
    • D01F6/84C08G63/60
    • A wholly aromatic polyester is provided which has been found to be highly amenable to melt extrusion to yield high performance fibers. Such fibers following thermal treatment exhibit high tenacity and tensile modulus properties which are well retained at elevated temperatures while exhibiting a low degree of shrinkage. Unlike wholly aromatic polyesters normally encountered in the prior art, the polymer of the present invention is not intractable and may be melt extruded with ease at temperatures below approximately 300.degree. C., and preferably below approximately 280.degree. C. The aromatic polyester of the present invention consists essentially of recurring units (a) p-oxybenzoyl moiety, (b) 2,6-dicarboxynaphthalene moiety, (c) symmetrical dioxy aryl moiety (as defined), and (d) isophthaloyl moiety and/or metal-dioxy phenylene moiety, and is free of units which possess ring substitution. The wholly aromatic polyester of the present invention forms an atypical thermotropic melt phase which is exhibited in the absence of ring substitution at a relatively low temperature which facilitates fiber formation with ease. The wholly aromatic polyester of the present invention following melt spinning and thermal treatment commonly can exhibit an average single filament tenacity of at least 15 grams per denier, and an average single filament tensile modulus of at least 300 grams per denier.
    • 提供了一种全芳族聚酯,已被发现是高度易于熔融挤出以产生高性能纤维。 热处理后的这种纤维表现出高强度和拉伸模量性能,它们在升高的温度下良好地保持,同时表现出低的收缩率。 与现有技术中通常遇到的全芳族聚酯不同,本发明的聚合物不难处理,并且可以在低于约300℃,优选低于约280℃的温度下容易地熔融挤出。本发明的芳族聚酯 本发明基本上由重复单元(a)对羟基苯甲酰部分,(b)2,6-二羧基萘部分,(c)对称的二氧基芳基部分(如所定义))和(d)间苯二酰部分和/或金属二氧基亚苯基部分 并且没有具有环取代的单元。 本发明的全芳族聚酯形成非典型的热致熔融相,其在相对较低的温度下在不存在环取代的情况下表现出来,这便于轻松形成纤维。 熔融纺丝和热处理后本发明的全芳族聚酯通常可显示至少15克/旦尼尔的平均单丝强度,平均单丝拉伸模量至少为300克/旦尼尔。
    • 10. 发明授权
    • Process for achieving higher orientation in partially oriented yarns
    • 在部分取向纱线中实现更高取向的方法
    • US4415521A
    • 1983-11-15
    • US357951
    • 1982-03-15
    • Robert M. MininniSunil K. GargHenry H. George, Jr.Anne HoltSteven B. Warner
    • Robert M. MininniSunil K. GargHenry H. George, Jr.Anne HoltSteven B. Warner
    • D01D5/092D01F6/62D01D1/04
    • D01F6/62D01D5/092
    • Provided is a process for melt spinning a partially oriented yarn of increased birefringence, and hence higher orientation, for a given wind-up speed. The process comprises extruding a molten fiber forming polyester through a shaped orifice to form a molten filamentary material, which is then passed in the direction of its length into a quench zone wherein the filamentary material is contacted with a first gaseous quenching medium. While the filamentary material is still in a deformable state, however, it is passed through a hot zone provided with an atmosphere having a temperature greater than the first gaseous quenching medium and greater than the glass transition temperature of the molten polyester filamentary material. The filamentary material is then withdrawn from the hot zone and contacted with a second gaseous quenching medium at a temperature below the glass transition temperature of the filamentary material until the filamentary material is no longer deformable, after which the filamentary material is withdrawn from the quench zone.
    • 提供了一种用于在给定的卷绕速度下熔融纺丝部分取向纱线的方法,所述纱线具有增加的双折射,并且因此更高的取向。 该方法包括通过成形孔挤出形成聚酯的熔融纤维以形成熔融丝状材料,然后将其熔融丝状材料沿其长度方向通入骤冷区,其中丝状材料与第一气态淬火介质接触。 然而,当丝状材料仍然处于可变形状态时,其通过具有大于第一气态淬火介质的温度大于熔融聚酯长丝材料的玻璃化转变温度的气氛的热区域。 然后将丝状材料从热区域中取出,并在低于丝状材料的玻璃化转变温度的温度下与第二气态淬火介质接触,直到丝状材料不再变形,然后将丝状材料从骤冷区域中取出 。