PROBLEM TO BE SOLVED: To provide a hair profile control agents first agent attaining uniform hair profile control effect regardless of the time of reducing the hair, the amount of its application to the hair and the damaged conditions of the hair.SOLUTION: The hair profile control agents first agent comprises (A) a thiol group-bearing hair-reducing substance and (B) an &alpha,&omega-dicarboxylic acid of general formula (1) (wherein, R1 is a 3-8C alkylene group) or a salt thereof, wherein the ratio of the content (b mass%) of the component B to the content ((a) mass%) of the component A where the thiol group is in a dissociated state, i.e. b/a, stands at 5-25.COPYRIGHT: (C)2009,JPO&INPIT【課題】髪を還元する時間、毛髪への塗布量、頭髪の損傷状態に拠らず均一な毛髪形状制御効果を得ることの可能な毛髪形状制御剤第1剤を提供すること。【解決手段】次の成分(A)及び(B):(A)チオール基を有する毛髪還元性物質(B)一般式(1)で表されるα,ω-ジカルボン酸又はその塩〔式中、R1は炭素数3~8のアルキレン基を示す。〕を含有し、かつチオール基が解離状態にある成分(A)の含有量(a質量%)に対する成分(B)の含有量(b質量%)の比b/aが5~25の範囲である毛髪形状制御剤第1剤組成物。【選択図】なし
