COPOLYMER, COSMETIC COMPOSITION, AND HAIR COSMETIC

摘要

PROBLEM TO BE SOLVED: To provide a copolymer which is excellent in the adsorption amount of a cationic surfactant and also excellent in the viscosity or smooth sensation upon application when used as a hair cosmetic, and a cosmetic composition and a hair cosmetic which contain the copolymer.

SOLUTION: The present invention relates to a copolymer having a constituent unit corresponding to a vinyl monomer (A) having a carboxyl group in the structure thereof and a constituent unit corresponding to a vinyl monomer (B) represented by formula (1), and in which the ratio of the constituent unit corresponding to the vinyl monomer (A) to the total mass of the copolymer is 15 to 60 mass%: CH2=C(R1)-CO-X-(Q-O)r-R2...(1); wherein, R1represents a hydrogen atom or a methyl group; R2represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms; Q represents an alkylene group having 2 to 4 carbon atoms which may have a substituent; r represents 2 to 15; and X represents an oxygen atom or NH, wherein the number of atoms are bound linearly in the structure-(Q-O)r-R2is 70 or less.

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