SOIL RELEASING AGENT FOR FIBER

摘要

The invention provides a soil releasing agent for fiber, including a polymer having a weight-average molecular weight in a range from 2,000 to 30,000, and containing a structural unit (A) and a structural unit (B), the content of the structural unit (A) in the polymer being 50 to 99 percent by weight, and the content of the structural unit (B) in the polymer being 1 to 50 percent by weight: (A) a structural unit derived from a monomer which has an unsaturated bond and at least one amino group selected from a primary amino group, a secondary amino group and a tertiary amino group; (B) a structural unit derived from a monomer which has an unsaturated bond and at least one hydrophobic group selected from the group consisting of an alkyl or alkenyl group, each having 4 to 22 carbon atoms, being straight, branched or cyclic, an arylalkyl group having 1 to 22 carbon atoms in the alkyl group and an aryl group, and which monomer has no primary to tertiary amino group and then a method for treating fiber is conducted in an aqueous solution which contains the soil release agent and is adjusted to pH 2 to 9.