Abstract: Hard-to-coat color lakes and other powders useful in cosmetics and other industries are coated with a duplex coating system comprising basic and nonbasic functionalized coating components, for example a basic functionalized aminopolysiloxane and a nonbasic alkoxypolysiloxane. Control of bleeding of a color lake into aqueous media is possible. A novel duplex coating system, treatment process, treated powder and cosmetic formulation containing same are disclosed.

Abstract: A hybrid coating material and process for pigments and other powders, for example cosmetic powders employs an organometallate, for example a titanate, and a functionalized silicon compound, for example a trialkoxysilane or a functionalized polysiloxane, which covalently bond to each other and to the substrate powder. The coated powders can exhibit excellent hydrophobicity coupled with lipophilicity. Employment of fluorinated silicon compounds may provide hydrophobicity and lipophobicity. Examples show good dispersibility of coated pigments in aqueous, oil and silicone fluids.

Abstract: Novel organosilicon-treated cosmetic powders, for example, a pigment, extender pigment or filler are free from residual hydrogen, have a smooth feel, good skin adhesion, good color and spreadability and resistance to acids and alkalis. The treated powders are useful in cosmetics such as powder formulations, oil-in-water and water-in-oil emulsions, anhydrous make-up and lipstick. Treatment can be effected with a linear reactive alkylpolysiloxane having substituted in repeating units in the backbone of the molecule both cationic and anionic groups, for example aminoethylaminopropyl and alkoxy groups. The organosilicon compound can be adsorbed and chemically bonded to the surface of the powder by heat treatment. The alkylpolysiloxane compound can have a degree of polymerization of from 5 to 100, preferably 10-15. A process for producing the treated pigment is also disclosed as are cosmetic formulations made with the treated pigment.