SURFACE-MODIFIED ZINC OXIDE PARTICLES, LIQUID DISPERSION, AND COSMETIC

    公开(公告)号:US20230218488A1

    公开(公告)日:2023-07-13

    申请号:US17997348

    申请日:2020-04-30

    IPC分类号: A61K8/02 A61Q17/04

    摘要: Surface-modified zinc oxide particles which have a silane coupling agent having an alkoxy group on surfaces thereof, in which d50 when measured with a laser diffraction/scattering type particle size distribution-measuring instrument by the following measurement method is 4 μm or less. (Measurement method) 10 g of the surface-modified zinc oxide particles, 88 g of cyclopentasiloxane, and 2 g of polyglyceryl-3 polydimethylsiloxyethyl dimethicone are mixed to obtain a liquid mixture, a dispersion treatment is performed on the obtained liquid mixture at 9,500 rpm for 5 minutes using a homogenizer to obtain a liquid dispersion, the liquid dispersion is diluted with cyclopentasiloxane so that a content of the surface-modified zinc oxide particles in the obtained liquid dispersion is 0.01% by mass to produce a measurement solution, and d50 is measured with the laser diffraction/scattering type particle size distribution-measuring instrument using the obtained measurement solution.