Patent ID: 6228489
Filing Date: 2001-05-08
Classification: D01F,Y10T

Abstract:
An oxidized fibrillated acrylic fiber made by a process including the steps of:copolymerizing a mixture of olefinic monomers comprising acrylonitrile and an unsaturated carboxylic acid to form an acrylic polymer;forming a solution of said acrylic polymer;wet-spinning said solution to form gel-state acrylic fiber;forming gel-state acrylic staple fiber from said gel-state acrylic fiber;mechanically fibrillating said gel-state acrylic staple fiber to form gel-state fibrillated acrylic staple fiber;drying said gel-state fibrillated acrylic staple fiber to form dried fibrillated acrylic staple fiber; andforming said oxidized fibrillated acrylic fiber by oxidizing said dried fibrillated acrylic staple fiber to an extent such that the oxidized fibrillated acrylic fiber contains about 8% by weight of added oxygen.