Abstract: A leave-on hair cosmetic composition, which contains the following components (A), (B) and (C): (A) an organic C2-8 dicarboxylic acid or salt thereof selected from the group consisting of malonic acid, succinic acid, malic acid, or salts thereof, (B) at least one or more of an organic solvent selected from the group consisting of aromatic alcohols, wherein the organic solvent has a ClogP of from ?2 to 3, and (C) an edetic acid or a salt thereof, wherein the cosmetic composition has a pH of from 2 to 5 at 25° C. when diluted to 20 times the weight with water. The present invention also relates to a hair quality improving method which includes treating the hair with the hair cosmetic composition. The hair cosmetic composition of the present invention can provide benefits such as luster, manageability, pliability and elasticity to the hair which is apt to be dry, having lost water therefrom owing to damage by coloring, permanent waving, or repetitive excessive blow drying.

Abstract: Provided is a leave-on hair cosmetic composition, which contains the following components (A), (B) and (C): (A) an organic C2-8 dicarboxylic acid or salt thereof, (B) at least one or more of an organic solvent selected from the group consisting of aromatic alcohols, N-alkylpyrrolidones, alkylene carbonates, polypropylene glycols, lactones and cyclic ketones, wherein the organic solvent has a ClogP of from ?2 to 3, and (C) an edetic acid or a salt thereof, wherein the cosmetic composition has a pH of from 2 to 5 at 25° C. when diluted to 20 times the weight with water. The present invention also relates to a hair quality improving method which includes treating the hair with the hair cosmetic composition. The hair cosmetic composition of the present invention can provide benefits such as luster, manageability, pliability and elasticity to the hair which is apt to be dry, having lost water therefrom owing to damage by coloring, permanent waving, or repetitive excessive blow drying.

Abstract: Provided is a leave-on hair cosmetic composition, which contains the following components (A), (B) and (C): (A) an organic C2-8 dicarboxylic acid or salt thereof, (B) at least one or more of an organic solvent selected from the group consisting of aromatic alcohols, N-alkylpyrrolidones, alkylene carbonates, polypropylene glycols, lactones and cyclic ketones, wherein the organic solvent has a ClogP of from ?2 to 3, and (C) at least one or more of a compound selected from the group consisting of benzophenones, para-aminobenzoic acids, para-methoxycinnamic acids, salicylic acids, rutin and 4-tert-butyl-4?-methoxybenzoylmethane; wherein the cosmetic composition has a pH of from 2 to 5 at 25° C. when diluted to 20 times the weight with water. The present invention also relates to a hair quality improving method which includes treating the hair with the hair cosmetic composition.

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.