Patent ID: 7612000

Claim:
A modacrylic shrinkable fiber manufactured from a spinning solution comprising a polymer composition obtained by mixing 50 to 99 parts by weight of a polymer (A) comprising 40 wt % to 80 wt % of acrylonitrile, 20 wt % to 60 wt % of a halogen-containing monomer and 0 wt % to 5 wt % of a sulfonic-acid-containing monomer, and 1 to 50 parts by weight of a polymer (B) comprising 5 wt % to 70 wt % of acrylonitrile, 20 wt % to 94 wt % of an acrylic ester and 16 wt % to 40 wt % of a sulfonic-acid-containing monomer comprising a methallylsulfonic acid or metal salts thereof or amine salts thereof, and no halogen-containing monomer; a total amount of the polymer (A) and the polymer (B) being 100 parts by weight; wherein the modacrylic shrinkable fiber is capable of being dyed in deep colors at a temperature equal to or lower than 80° C. and achieving a post-dyeing shrinkage ratio treated in dry heat at 130° C. for 5 minutes of equal to or larger than 20%.