MOISTURE ABSORBING FIBER DYEABLE WITH CATIONIC DYE, AND METHOD FOR PRODUCING SAME

摘要

Disclosed is a low-cost moisture absorbing fiber which can be practically dyed with a cationic dye and can sufficiently develop a color with the cationic dye, while maintaining the characteristics of a crosslinked acrylic acid-based fiber. Specifically disclosed is a moisture absorbing fiber dyeable with a cationic dye, which is obtained by crosslinking and hydrolyzing an acrylonitrile fiber that contains not less than 0.03 mmol/g of sulfonic acid groups relative to the weight of the fiber. The moisture absorbing fiber dyeable with a cationic dye is characterized in that the fiber is composed of a region of a crosslinked acrylic acid polymer having a carboxyl group and a crosslinked structure, and a region of an acrylonitrile polymer having a sulfonic acid group. The moisture absorbing fiber dyeable with a cationic dye is also characterized in that the region of the acrylonitrile polymer is within the range of 20-80%.