PROBLEM TO BE SOLVED: To provide a hair cosmetic which excels in an effect of imparting smoothness to the hair and its durability, is free of stickiness on application, and furthermore excels in storage stability as well.SOLUTION: The hair cosmetic includes component (A) of a branched fatty acid represented by formula (1) or its salt and component (B) of an organopolysiloxane in which a poly(N-acylalkyleneimine) composed of a repeating unit represented by formula (2) is bonded to at least one silicon atom of an organopolysiloxane segment through an alkylene group having a heteroatom, the organopolysiloxane having a mass ratio of the organopolysiloxane segment to the poly(N-acylalkyleneimine) segment of 98/2 to 40/60 and a mass-average molecular weight of 50,000-500,000.COPYRIGHT: (C)2009,JPO&INPIT【課題】毛髪に対する滑らかさの付与効果及びその持続性に優れ、塗布時にべたつかず、しかも保存安定性にも優れる毛髪化粧料の提供。【解決手段】成分(A)及び(B)を含有する毛髪化粧料。(A)一般式(1)で表される分岐脂肪酸又はその塩(B)オルガノポリシロキサンセグメントのケイ素原子の少なくとも1個に、ヘテロ原子を含むアルキレン基を介して、下記一般式(2)で表される繰り返し単位からなるポリ(N-アシルアルキレンイミン)が結合してなり、該オルガノポリシロキサンセグメントと該ポリ(N-アシルアルキレンイミン)セグメントとの質量比が98/2~40/60であり、質量平均分子量が50,000~500,000であるオルガノポリシロキサン【選択図】なし
