Method for producing silica particles and their use in cosmetic compositions
AssigneeMomentive Performance Materials Japan LLC
InventorsHorie Yutaka, Benjamin Falk, Qinghua Li, Amar Pawar, Koji Suenaga
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to silica particles comprising repeating units of (SiO4/2) that are spherical in shape, which has the benefit of compatibility with personal care components and the resulting personal care applications. The present disclosure also relates to methods of preparing silica particles.
Claims21
Silica particles comprising repeating units of (SiO4/2), wherein the silica particles are prepared by heating polymethylsilsesquioxane fine particles at a temperature of 500° C. or less in an atmosphere comprising from about 5% to about 15% oxygen, wherein the silica particles have a D90/D10 particle size distribution of about 1.3 or less as measured by particle size analyzer utilizing laser diffraction particle size analysis, wherein the silica particles are spherical and have a sphericity of 0.9 or more, as defined by minor axis/major axis, and wherein the silica particles have a BET surface area from about 0.1 m2/g to about 5 m2/g, and wherein the silica particles are suitable for a personal care formulation.
Silica particles comprising repeating units of (SiO4/2), wherein the silica particles are prepared by heating polymethylsilsesquioxane fine particles at a temperature of less than 500° C. in an atmosphere comprising from about 10% to about 15% oxygen and for a time of from about 10 minutes to about 1 hour, wherein the silica particles have a D90/D10 particle size distribution of about 1.3 or less as measured by particle size analyzer utilizing laser diffraction particle size analysis, wherein the silica particles are spherical and have a sphericity of 0.9 or more, and wherein the silica particles have a BET surface area from about 0.1 m2/g to about 5 m2/g.
Dependencies are inferred from the claim text.