DISPERSANT FOR COSMETIC AND COSMETIC COMPOSITION CONTAINING THE DISPERSANT

摘要

[PROBLEMS] When water-insoluble microparticles of a pigment, ultraviolet protective agent, antibacterial agent, anti-dandruff agent, etc. to be blended in a cosmetic composition are dispersed in a water system, the microparticles agglomerate as primary particles, so that the inherent properties of microparticles would be suppressed. Thus, it is intended to provide a dispersant for cosmetic that excels in the dispersing capability enabling prevention of the primary particle agglomeration and in the effect of lowering the high paste viscosity at the stage of dispersion, and to provide a cosmetic composition containing the dispersant. [MEANS FOR SOLVING PROBLEMS] There is provided a dispersant for cosmetic consisting of an amphoteric copolymer containing a polyamidopolyamine group and a polyalkylene glycol group in each molecule, obtained by copolymerization of (A) polyamidopolyamine alkylene oxide adduct having an unsaturated group, (B) (meth)acrylic acid or its salt and (C) ester of polyalkylene glycol and (meth)acrylic acid used in proportion (A):(B):(C) = 5 to 85:5 to 85:5 to 85 (mass%) provided that the sum thereof is 100 mass%. Further, there is provided a cosmetic composition containing the dispersant.