Process of making multicomponent fibers

摘要

The present invention provides nonwoven webs comprising multicomponent fibers that enable the nonwoven web to possess high extensibility. The multicomponent fibers will comprise a first component comprising a polypropylene composition having a melt flow rate of from about 100 to about 2000 grams per 10 minutes and a second component comprising a polymer composition having a melt flow rate lower than the melt flow rate of the first component. The first component comprises at least about 10% of a surface of the multicomponent fiber.

主权项

1. A method of making multi-component fibers having an outside surface, said method comprising the steps of:
a. providing a first component comprising a polypropylene having a single melt flow rate in the range of from about 100 to about 2,000 grams per 10 minutes; b. providing a second component comprising a polymer having a single melt flow rate in the range of from about 10 to about 80 grams per 10 minutes; c. directing separate feed streams of each component into a spinneret configured to form a spatial configuration of the components, and melt spinning said first component and said second component into multi-component fibers which have a diameter of from about 5 to about 50 microns, wherein:
the first component comprises at least about 50% of the outside surface of the multi-component fibers, and said first component consists essentially of a single melt flow rate in the range of from about 100 to about 2,000 grams per 10 minutes, andthe second component of the fibers is spatially separate from said first component, and said second component consists essentially of a single melt flow rate in the range of from about 10 to about 80 grams per 10 minutes.