Patents

Kao Patents Anhydrous Dyeing Composition

US Patent No. 9,776,02 B2; Kao Germany GMBH has patented an anhydrous dyeing composition for hair that is comprised of one or more oxidative dye precursors, one or more oils which is liquid at 20°C, at least one anionic surfactant, at least one nonionic surfactant, and a surface active block polymer of the general structure.

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