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1. 发明申请

US20140323003A1 Bicomponent Fibers and Methods for Making Them 审中-公开
标题翻译：双组分纤维及其制备方法
公开(公告)号：US20140323003A1
公开(公告)日：2014-10-30
申请号：US13879997
申请日：2011-10-18
申请人： ExxonMobil Chemical Patents Inc.
发明人： Galen C. Richeson , Alistair D. Westwood , Aspy K. Mehta
IPC分类号： D01F8/06 , D01F1/00
CPC分类号： D01F8/06 , D01D5/0985 , D01D5/40 , D01F1/00 , D01F6/46 , Y10T428/2929 , Y10T442/3154
摘要： The present invention relates to bicomponent polymer fibers, and to processes for forming those fibers. Bicomponent polymer fibers are described, having a core comprising a core polymer and a sheath comprising a sheath polymer, wherein the sheath polymer is a polyolefin having an Mw less than about 65,000 g/mol. The core polymer has an Mw at least about 20,000 g/mol greater than the Mw of the sheath polymer. Processes for forming bicomponent fibers are also described, comprising (i) forming a molten blend of a core polymer and a sheath polymer; (ii) extruding the molten polymer blend using an extrusion die having a length to diameter ratio greater than or equal to about 10 and under shear conditions sufficient to drive the sheath polymer to the die wall; and (iii) forming meltblown fibers having a core comprising the core polymer and a sheath comprising the sheath polymer.
摘要翻译：本发明涉及双组分聚合物纤维，以及用于形成这些纤维的方法。描述了双组分聚合物纤维，其具有包含芯聚合物的芯和包含鞘聚合物的鞘，其中所述鞘聚合物是Mw小于约65,000g / mol的聚烯烃。芯聚合物具有比鞘聚合物的Mw大至少约20,000g / mol的Mw。还描述了用于形成双组分纤维的方法，其包括（i）形成芯聚合物和鞘聚合物的熔融共混物; （ii）使用长度至直径比大于或等于约10的挤出模头挤出熔融聚合物共混物，并且在足以将护套聚合物驱动到模具壁的剪切条件下; 和（iii）形成具有芯的熔喷纤维，所述芯包含芯聚合物和包含鞘聚合物的护套。

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