PROBLEM TO BE SOLVED: To provide a pretreatment agent for foamy oxidation hair dyeing which can generate foam having elasticity and excellent malleability without using a surfactant, can easily and homogeneously dye in a short time the hair having a significantly different brightness between a new part to be dyed and a dyed part, as well as can greatly improve washing-proof properties on long-lasting color agent.SOLUTION: The invention relates to a pretreatment agent for foamy oxidation hair dyeing containing the following components (A) and (B): (A) (PEG-240/decyltetradeceth-20/hexamethylene di-isocyanate) copolymer and (B) one or more kinds selected from the group consisting of a basic dye, an HC dye, and tar dye.COPYRIGHT: (C)2015,JPO&INPIT【課題】本発明は、界面活性剤を用いることなく弾力性を有し展性に優れた泡状に生成せしめることが出来るものであって、新生部と既染部との明度差の大きい毛髪を簡単に短時間で均一に染毛施術することが出来るのみならず、ヘアカラ-の色持ちに関する耐洗性を著しく向上せしめることが出来る、泡状酸化染毛用前処理剤に関する。【解決手段】本発明は下記の成分(A)及び(B)を含有することを特徴とする泡状酸化染毛用前処理剤。(A)(PEG-240/デシルテトラデセス-20/ヘキサメチレンジイソシアネ-ト)コポリマ-(B)塩基性染料、HC染料、タ-ル色素からなる群から選択される1種又は2種以上【選択図】なし
