Loading patent…
AssigneeShowa Denko K.K.
InventorsKoichi Wada, Nobuaki Ishii, Mitsuharu Irie, Kazuo Sekiguchi, Michihiro Takama
Estimating the term…
The invention relates to (1) a cosmetic material comprising silica-coated metal oxide particles further surface-treated with a hydrophobicizing agent, and (2) metal oxide particles having a specified infrared absorption spectrum intensity ratio and refractive index which are further treated with a hydrophobicizing agent, and to a process for their production. The invention further relates to a silica-coated metal oxide sol which gives such particles, and to a process for its production. The invention can give ultraviolet-screening cosmetic materials with an excellent transparent feel, wherein the particles are satisfactorily dispersed.
A cosmetic material comprising silica-coated metal oxide particles coated with a hydrophobicizing agent in an amount sufficient to completely coat the surface of the silica-coated metal oxide particles and no more than 30 wt %,
A cosmetic material characterized by comprising a silica-coated metal oxide sol obtained by a process for production of a silica-coated metal oxide sol characterized by adding a) silicic acid or a silicic acid-producing precursor, b) an alkali, c) an organic solvent and if necessary, d) water, irrespective of order, to a metal oxide sol produced by hydrolysis, for a water/organic solvent ratio in the range of 0.1-10 and a silicon content in the range of 0.0001-5 moles/liter after combining, and depositing silica on the surface of the metal oxide sol particles to form a silica film, and/or a surface-hydrophobicized silica-coated metal oxide sol obtained by a process for production of a surface-hydrophobicized silica-coated metal oxide sol characterized by adding a) silicic acid or a silicic acid-producing precursor, b) an alkali, c) an organic solvent and if necessary, d) water, irrespective of order, to a metal oxide sol produced by hydrolysis, for a water/organic solvent ratio in the range of 0.1-10 and a silicon content in the range of 0.0001-5 moles/liter after combining, and depositing silica on the surface of the metal oxide sol particles to form a silica film, thereby fabricating a silica-coated metal oxide sol, and then further surface treating the silica-coated metal oxide particles with a hydrophobicizing agent.
A cosmetic material characterized by comprising silica-coated metal oxide particles obtained by solid/liquid separation, drying and, if necessary, pulverization of a silica-coated metal oxide sol obtained by a process for production of a silica-coated metal oxide sol characterized by adding a) silicic acid or a silicic acid-producing precursor, b) an alkali, c) an organic solvent and if necessary, d) water, irrespective of order, to a metal oxide sol produced by hydrolysis, for a water/organic solvent ratio in the range of.0.11-10 and a silicon content in the range of 0.0001-5 moles/liter after combining, and depositing silica on the surface of the metal oxide sol particles to form a silica film, and surface-hydrophobicized silica-coated metal oxide particles obtained by solid/liquid separation, drying and if necessary pulverization of a surface-hydrophobicized silica-coated metal oxide sol obtained by a process for production of a surface-hydrophobicized silica-coated metal oxide sol characterized by adding a) silicic acid or a silicic acid-producing precursor, b) an alkali, c) an organic solvent and if necessary, d) water, irrespective of order, to a metal oxide sol produced by hydrolysis, for a water/organic solvent ratio in the range of 0.1-10 and a silicon content in the range of 0.0001-5 moles/liter after combining, and depositing silica on the surface of the metal oxide sol particles to form a silica film, thereby fabricating a silica-coated metal oxide sol, and then further surface treating the silica-coated metal oxide particles with a hydrophobicizing agent in an amount sufficient to completely coat the surface of the silica-coated metal oxide particles and no more than 30 wt %.
A cosmetic material characterized by comprising surface-hydrophobicized silica-coated metal oxide particles obtained by solid/liquid separation, drying and if necessary pulverization of a surface-hydrophobicized silica-coated metal oxide sol obtained by a process for production of a surface-hydrophobicized silica-coated metal oxide sol characterized by adding a) silicic acid or a silicic acid-producing precursor, b) an alkali, c) an organic solvent and if necessary, d) water, irrespective of order, to a metal oxide sol produced by hydrolysis, for a water organic solvent ratio in the range of 0.1-10 and a silicon content in the range of 0.0001-5 moles/liter after combining, and depositing silica on the surface of the metal oxide sol particles to form a silica film, thereby fabricating a silica-coated metal oxide sol, and then further surface treating the silica-coating metal oxide particles with a hydrophobicizing agent in an amount sufficient to completely coat the surface of the silica-coated metal oxide particles and no more than 30 wt %.
Dependencies are inferred from the claim text.