PROCESS FOR INCREASING STAIN-RESISTANCE OF CATIONIC-DYEABLE MODIFIED POLYAMIDE FIBERS

摘要

This invention relates to an improved process for dyeing cationic-dyeable po lyamide fibers, especially carpet fibers, with an acid dye to provide stain-resistant fibers. The polyamide fibers contain cationic ally dyeable sulfonate groups along the polymer chain. T he improvement involves adding certain water-soluble salts to a dyebath at a co ncentration of at least 20 % based on the weight of fibe r.