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    • 7. 发明授权
    • Polypropylene highly spread plexifilamentary fiber
    • 聚丙烯高度传播丛生纤维
    • US5436074A
    • 1995-07-25
    • US982055
    • 1992-11-25
    • Kazuhiko ShimuraYoshiaki Nakayama
    • Kazuhiko ShimuraYoshiaki Nakayama
    • D01D5/11D01F6/06D01F6/00
    • D01D5/11D01F6/06Y10T428/29Y10T428/2913Y10T428/2922Y10T428/2973Y10T428/2978
    • A polypropylene three-dimensional plexifilamentary fiber having a microwave birefringence of 0.07 or more and an Mw/Mn of 4.3 or less. Although a spreading agent is not included in this fiber, the fiber has a superior fiber spreadability and dimensional stability. The fiber in accordance with the present invention can be spun from a dope composed of an isotactic polypropylene having an Mw/Mn of 4.3 or less and an MFR of 20 or less, and a halogenated hydrocarbon, by a flash spinning technique. Further, the present invention provides a spinning dope and a method of manufacturing the fiber which effectively prevent ozone layer destruction by using a 2,2-dichloro-1,1,1-trifluoroethane, a 1,2-dichlorotrifluoroethane or a solvent blended a dichloromethane with either of the above two solvents as the halogenated hydrocarbon.
    • 聚丙烯三维丛状纤维,其微波双折射为0.07以上,&上,< Mw /&upbar&Mn为4.3以下。 虽然该纤维中不包含铺展剂,但纤维具有优异的纤维铺展性和尺寸稳定性。 根据本发明的纤维可以通过闪纺技术从由具有4.3以下的&上式> Mw /&Upbar&Mn和MFR 20以下的全同立构聚丙烯和卤代烃组成的涂料纺丝。 此外,本发明提供纺丝原液和制造纤维的方法,其通过使用2,2-二氯-1,1,1-三氟乙烷,1,2-二氯三氟乙烷或溶剂混合来有效地防止臭氧层破坏 二氯甲烷与上述两种溶剂中的任一种作为卤代烃。