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US 4,648,908 AGranted
Coated pigment and cosmetic materials comprising the same
AssigneePola Chemical Industries Inc.
InventorsYutaka Takasuka, Kunihiko Mohri, Akiko Kawaguchi
Life of this patent
Estimating the term…
Abstract
Pigments coated with metallic soap and containing water easily disperse in the water and yet demonstrate water-repellency. The present pigments will thus obtain cosmetic which will give the user a refreshment and longer lasting and water-repellent make-up.
Claims11
A coated pigment composition readily dispersed in water comprising at least one coated pigment and at least 20% by weight of said composition of of water;
- said pigment selected from the group consisting of titanium dioxide-coated mica, colored titanium dioxide-coated mica and colored bismuth oxychloride, coated on the surfaces thereof with a water-repellent coating of a metallic soap of the formula (RCCO).sub.n M, wherein R is selected from straight chain, branched chain, saturated and unsaturated aliphatic hydrocarbon groups having more than 6 carbon atoms, M is selected from aluminum and zinc, and n is the valency of the metal, said surface coating being prepared by reacting in an aqueous medium an alkaline salt of an aliphatic acid radical (RCOO).sup.- with a mineral acid metal salt where said metal is M as defined above in a theoretical equivalent ratio of 1:4 to 1:10 and said pigments, the ratio by weight of said pigment to said so-formed soap being in the ratio of 1:0.01 to 1:0.1.
Dependencies are inferred from the claim text.