| 摘要 |
PROBLEM TO BE SOLVED: To provide a pretreatment agent for an acid hair dye, obtained by targeting improved dye-affinity and fastness, and hardly causing damage of the hair. SOLUTION: The pretreatment agent for the acid hair dye contains urea and benzyl alcohol formulated therewith, and has pH 5.0-11.0. A copolymer composition comprising a dimethyldiallylammonium chloride and acrylamide, and having 2,000-40,000 average molecular weight is preferably compounded therewith in the pretreatment agent for the acid hairdye. COPYRIGHT: (C)2007,JPO&INPIT
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