Surface-Modified Metal Oxides, Method for Producing Them, and Their Use in Cosmetic Preparations
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Abstract
The present invention relates to surface-modified nanoparticulate metal oxides where the metal is chosen from the group consisting of aluminum, cerium, iron, titanium, zinc and zirconium, wherein the surface modification comprises a coating with a copolymer P of A) 60 to 99 mol % of an N-vinyllactam and B) 1 to 40 mol % of a monomer chosen from the group of
- b1) C8-C30-alkyl esters of monoethylenically unsaturated C3-C8-carboxylic acids
- b2) N-alkyl- or N,N-dialkyl-substituted amides of acrylic acid or of methacrylic acid with C8-C8-alkyl radicals, or
- b3) vinyl esters of aliphatic C8-C30-carboxylic acids, or mixtures of these monomers.
40 Citations
28 Claims
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1-14. -14. (canceled)
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15. A surface-modified nanoparticulate metal oxide, wherein of the metal oxide metal is selected from the group consisting of aluminum, cerium, iron, titanium, zinc and zirconium and wherein the surface modification comprises a coating with a copolymer P wherein copolymer P comprises
A) 60 to 99 mol % of an N-vinyllactam and B) 1 to 40 mol % of a monomer chosen from the group of b1) C8-C30-alkyl esters of monoethylenically unsaturated C3-C8-carboxylic acids b2) N-alkyl- or N,N-dialkyl-substituted amides of acrylic acid or of methacrylic acid with C8-C18-alkyl radicals, or b3) vinyl esters of aliphatic C8-C30-carboxylic acids, or mixtures of these monomers C) 0 to 39 mol % of further copolymerizable monomers.
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19. A process for the preparation of a surface-modified nanoparticulate metal oxide wherein the metal of the metal oxide is selected from the group consisting of aluminum, cerium, iron, titanium, zinc and zirconium, comprising
a. precipitating the metal oxide from an aqueous solution of one of its metal salts, b. separating off the precipitated metal oxide from the aqueous reaction mixture and c. subsequently drying the metal oxide, wherein the precipitation of the metal oxide in process step a. takes place in the presence of a copolymer P wherein copolymer P comprises A) 60 to 99 mol % of an N-vinyllactam and B) 1 to 40 mol % of a monomer chosen from the group of b1) C8-C30-alkyl esters of monoethylenically unsaturated C3-C8-carboxylic acids b2) N-alkyl- or N,N-dialkyl-substituted amides of acrylic acid or of methacrylic acid with C8-C18-alkyl radicals, or b3) vinyl esters of aliphatic C8-C30-carboxylic acids, or mixtures of these monomers.
Specification