Patent ID: 8158115

Claim:
A detergent composition, comprising: at least one copolymer; and at least one surfactant; wherein, the at least one copolymer comprises as constituting units: a cationic vinyl monomer (A); and a vinyl monomer (B); wherein the cationic vinyl monomer (A), comprises: a monomer (A2) of formula (3) wherein c is 0, and optionally a monomer (A1) of formula (3) wherein c is 1, CH 2 ═C(R 5 )—CO—(O) c —(NH) 1-c —(CH 2 ) d —N + R 6 R 7 R 8 .X − (3) wherein R 5 is a hydrogen atom or a methyl group, each of R 6 and R 7 which are independent of each other, is a C 1-24 alkyl group, an aryl group or an aralkyl group, R 8 is a hydrogen atom, a C 1-24 alkyl group, an aryl group, an aralkyl group or —CH 2 —CH(OH)—CH 2 —N + R 9 R 10 R 11 .Y—, each of R 9 to R 11 which are independent of one another, is a C 1-24 alkyl group, an aryl group or an aralkyl group, each of X − and Y − which are independent of each other, is an anion, c is 0 or 1, and d is an integer of from 1 to 10, the vinyl monomer (B), comprises: a monomer of formula (I) CH 2 ═C(R 1 )—CO—NR 2 R 3 (1) wherein R 1 is a hydrogen atom or a methyl group, and each of R 2 and R 3 which are independent of each other, is a hydrogen atom or a C 1-3 alkyl group, provided that the sum of carbon numbers of R 2 and R 3 is from 1 to 4, or 2,3-dihydroxypropyl(meth)acrylate, and wherein a proportion of the cationic vinyl monomer (A) is from 25 to 45 mol % based on the entire copolymer, and the copolymer comprises no cross-linking agent as a component.