POLYSILOXANE-COATED METAL OXIDE PARTICLES, DISPERSION LIQUID, COMPOSITION, COSMETIC, AND METHOD FOR PRODUCING POLYSILOXANE-COATED METAL OXIDE PARTICLES

WIPO Patent Application WO/2024/080367

A1

The present invention addresses the problem of providing dimethylpolysiloxane-coated metal oxide particles having excellent hydrophobicity. The present invention also addresses the problem of providing a dispersion liquid, a composition and a cosmetic each containing the dimethylpolysiloxane-coated metal oxide particles. The present invention also addresses the problem of providing a method for producing the dimethylpolysiloxane-coated metal oxide particles.　The present invention relates to: polysiloxane-coated metal oxide particles, in which the surfaces of metal oxide particles are coated with dimethylpolysiloxane, and which have a hydroxyl group detection ratio of 10% or less; and a method for producing polysiloxane-coated metal oxide particles, the method comprising a surface treatment step for mixing metal oxide particles with dimethylpolysiloxane having a kinematic viscosity of 500 mm2/s to 4000 mm2/s inclusive at 25°C, without using a solvent, to coat the surfaces of the metal oxide particles with the dimethylpolysiloxane and a step for subjecting the dimethylpolysiloxane-coated metal oxide particles to a heat treatment at 250°C to 380°C inclusive.

MATSUSHITA HIROKAZU (JP)
ITO TOMOMI (JP)

PCT/JP2023/037244

April 18, 2024

October 13, 2023

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SUMITOMO OSAKA CEMENT CO LTD (JP)

C01G9/02; A61K8/27; A61Q1/00; C09C3/10; C09D17/00

WO2019225491A1

2019-11-28

JP2019178124A

2019-10-17

NISHIZAWA Kazuyoshi et al. (JP)

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