Hair dye composition having a particular buffer capacity and containing an alkylene carbonate
AssigneeKao Corporation
InventorsAtsushi Nakashimada, Nozomi Nagashima, Masahiko Sakai, Hajime Miyabe, Yutaka Shibata
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Abstract
The invention relates to a hair dye composition comprising (A) an acid dye and (B) an alkylene carbonate having 3-5 carbon atoms in total, said composition exhibiting a pH of 2-6, and having a buffer capacity of 0.007-0.5 gram equivalent/L, and to a method of dyeing hair using the hair dye composition. The hair dye composition is excellent in hair-dyeing ability without coloring the scalp and skin and has good fastness to shampoo and the like.
Claims16
A hair dye composition which comprises (A) an acid dye and (B) an alkylene carbonate having 3-5 carbon atoms in total, said composition exhibiting a pH of 2-6, and having a buffer capacity of 0.007-0.5 gram equivalent/L.
A method of dyeing hair which comprises applying to hair a hair dye composition comprising (A) an acid dye and (B) an alkylene carbonate having 3-5 carbon atoms in total, said composition exhibiting a pH of 2-6, and having a buffer capacity of 0.007-0.5 gram equivalent/L;
- subsequently allowing the hair to stand;
- and washing the hair by use of a shampoo.
Dependencies are inferred from the claim text.