FIBRILLATED WEATHERPROOF WEBS HAVING NETWORK STRUCTURE, NONWOVEN FABRICS MADE FROM THE WEBS, AND PROCESSES FOR THE PRODUCTION OF THE WEBS AND NONWOVEN FABRICS

摘要

Disclosed herein is a fibrillated weatherproofweb having a network structure, which can be producedwith ease and is economical. The web comprises amultilayer composite film composed of at least twolayers, one being a first layer (I) made of a firstthermoplastic resin and the other a second layer (II)made of a second thermoplastic resin having a meltingpoint lower than the first thermoplastic resin andcontaining at least 300 ppm of a light resistanceimparting agent. A number of slits have been formedin a longitudinal or transverse direction. The webhas been oriented at a draw ratio in a range of from1.1 to 15 times. A nonwoven fabric making use of oneor more fibrillated webs of the above sort andprocesses for the production of the web and nonwovenfabric are also disclosed.