MULTIFUNCTIONAL COATED POWDERS AND HIGH SOLIDS DISPERSIONS

The invention relates to the technical field of coated particles and methods for making coated powders. Embodiments include coated powders of TiO2 and other selected metal oxides, for use in UV protective topical skin compositions, and other UV protective coatings, wherein the coated powders (a) are...

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Bibliographische Detailangaben
Hauptverfasser:	SHAH, KUSHAL, SARKAS, HARRY W, MURRY, PATRICK G
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADHESIVES CHEMISTRY DYES HUMAN NECESSITIES HYGIENE MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE MEDICAL OR VETERINARY SCIENCE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS POLISHES PREPARATION OF CARBON BLACK PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES
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Beschreibung
Zusammenfassung:	The invention relates to the technical field of coated particles and methods for making coated powders. Embodiments include coated powders of TiO2 and other selected metal oxides, for use in UV protective topical skin compositions, and other UV protective coatings, wherein the coated powders (a) are photostable, in that they do not significantly change color under exposure to UV light; (b) are not chemically reactive, in that they minimally react with, or discolor, compositions during storage; and (c) may be formed into high weight loading dispersions. Coated powder embodiments comprise (a) nanoparticles, and (b) a coating on the surface of the nanoparticles, including silica moieties, organo oxysilane moieties selected from the group consisting of mono-organo oxysilane moieties, bi-organo oxysilane moieties and tri-organo oxysilane moieties, and poly(dialkyl)siloxane moieties. L'invention concerne une poudre revêtue comprenant (a) des nanoparticules, et (b) un revêtement, sur la surface des nanoparticules. Le revêtement comprend (1) des fractions de silice, (2) des fractions organo-oxysilane choisies dans le groupe constitué de fractions mono-organo-oxysilane, de fractions bi-organo oxysilane et de fractions tri-organo oxysilane, et (3) des fractions poly(dialkyl)siloxane.