PROBLEM TO BE SOLVED: To provide a copolymer for a detergent composition which has good foaming during washing, excellent foam quality, excellent finger combing and sliding properties during washing and softens the hair from the time of rinsing a shampoo to after drying.SOLUTION: There is provided a copolymer for a detergent composition composed of a copolymer (D) having a structural unit (a) represented by the general formula (1), a structural unit (b) represented by the general formula (2) and the other structural unit (c) derived from an ethylenically unsaturated monomer (C), where the molar fractions of (a), (b) and (c) are 2 to 60 mol%, 0.01 to 10 mol% and 30 to 97.99 mol%, respectively, based on the total molar number of (a), (b) and (c).COPYRIGHT: (C)2016,JPO&INPIT【課題】洗浄時の泡立ちがよく、泡質にも優れ、洗浄時やすすぎ時の指通り性、滑り性に優れ、シャンプーすすぎ時から乾燥後までの毛髪が柔らかくなる洗浄剤組成物用共重合体を提供することを目的とする。【解決手段】一般式（１）で表される構成単位（ａ）、一般式（２）で表される構成単位（ｂ）及びその他のエチレン性不飽和単量体（Ｃ）由来の構成単位（ｃ）とを有する共重合体（Ｄ）からなる洗浄剤組成物用共重合体であって、（ａ）、（ｂ）及び（ｃ）のモル分率が、（ａ）、（ｂ）及び（ｃ）の合計モル数を基準として、（ａ）が２～６０モル％、（ｂ）が０．０１～１０モル％、（ｃ）が３０～９７．９９モル％である洗浄剤組成物用共重合体。【選択図】なし
