Patent ID: 8426351

Claim:
A liquid softener composition, having pH 2 to 5 at 20° C. and comprising the following components (a1), (b1) and (c1), the content of the component (a1) being 0.1 to 5.0% by mass, the content of the component (b1) being 4 to 25% by mass, the content of the component (c1) being 20 to 95% by mass: component (a1): a polymer compound having a weight-average molecular weight of 2,000 to 90,000 and comprising a monomer unit (A1) derived from a compound represented by the following formula (1-1) or derived from an acid salt thereof and a monomer unit (B1) derived from alkyl (C8 to C18) acrylates or alkyl (C8 to C18) methacrylates at an (A1)/(B1) molar ratio of from 55/45 to 98/2: wherein R 1 and R 2 independently represent a hydrogen atom or a methyl group, R 3 represents a hydrogen atom or —COOM wherein M is a hydrogen atom or an alkali metal atom; X represents —COO—R 6 —, —CONR 7 —R 8 —, or —CH 2 —; when X is —CH 2 —, R 4 represents a group represented by the formula (1-3): when X is other than —CH 2 —, R 4 represents a methyl group or a hydroxyalkyl group having 1 to 3 carbon atoms; R 5 represents a methyl group, a hydroxyalkyl group having 1 to 3 carbon atoms, or a hydrogen atom; R 6 and R 8 independently represent an alkyl group having 2 to 3 carbon atoms; and R 7 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, component (b1): at least one compound selected from the group consisting of compounds represented by the following formulae (1-4) and (1-5): in formulae (1-4) and (1-5), R 21 , R 22 and R 23 independently represent a hydrocarbon group having 14 to 26 carbon atoms in total which is interrupted by an ester group and/or an amide group, a hydroxyalkyl group having 1 to 3 carbon atoms, or an alkyl group having 1 to 3 carbon atoms, at least one of which is a hydrocarbon group having 14 to 26 carbon atoms in total which is interrupted by an ester group and/or an amide group; R 24 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; and X − represents an anionic group; and component (c1): at least one compound selected from the group consisting water and solvents having a Clog P value of 2 or less.