PROBLEM TO BE SOLVED: To provide a copolymer capable of forming detergent compositions which are excellent in the smoothness in passing fingers through the hair in rinsing after washing and in the smoothness, nongreasiness, and nonstiffness of the hair after drying, and to provide detergent compositions containing the copolymer.SOLUTION: The invention relates to the copolymer comprising constituent units of a cationic vinyl monomer (A) and constituent units of a specific vinyl monomer (B) having a hydroxyl group or an amide linkage, wherein the content of the constituent units of the monomer (A) is 25 to 45% by mole based on the whole of the constituent units of the copolymer, and the invention relates to the detergent compositions containing the copolymer.COPYRIGHT: (C)2007,JPO&INPIT【課題】洗浄剤組成物に配合すると洗浄後の濯ぎの際の指通り、乾燥後のなめらかさ及びサラサラ感、ゴワツキの無さなどに優れる共重合体、及び洗浄剤組成物を提供する。【解決手段】カチオン性ビニル系単量体(A)に相当する構成単位と、水酸基又はアミド結合を有する特定のビニル系単量体(B)に相当する構成単位とを含む共重合体であって、共重合体を構成する全構成単位におけるカチオン性ビニル系単量体(A)に相当する構成単位の割合が25~45モル%である共重合体、及びこれを含有する洗浄剤組成物。【選択図】 なし
