ANTI-PILL ACRYLIC FIBER HAVING V-SHAPED CROSS SECTION AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an anti-pill acrylic fiber having a v-shaped cross section that has a fine fineness and an excellent feeling and water absorption property, and method for producing the same.;SOLUTION: There is provided an anti-pill acrylic fiber that is made from an acrylonitrile-based polymer including at least 92 mass% of acrylonitrile, 2.8 to 7.0 mass% of an ethylenic vinyl monomer copolymerizable with the acrylonitrile, and 1 to 5.2 mass% of sulfonic acid-containing vinyl monomer. In the anti-pill acrylic fiber having a v-shaped cross section, the single fiber fineness is 0.3 to 1.0 dtex, a fiber cross section is a v-shaped cross section, the inner angle of the v-shape is 60 to 100°, and the anti-pill is 3.5 grades or more. The anti-pill acrylic fiber having the v-shaped cross section can be obtained by wet spinning a fiber under a condition of a spinning draft of 1.7 to 2.2, drawing the fiber at a draw rate of 3.5 to 5 times, and then, drying and densifying the drawn fiber at a shrinkage ratio of 5% or less during the process, and then subjecting the densified fiber to tensional thermal treatment at a temperature of at least 165°C or higher.;COPYRIGHT: (C)2013,JPO&INPIT