Method of preparing core-shell zinc oxide particles
US10465075B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2018 |
| Grant date | Nov 5, 2019 |
| Priority date | — |
| Expiry date | Aug 14, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/61
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method of preparing core-shell zinc oxide particles, includes: mixing a calcium-containing material with a first zinc ammonia complex salt solution; heating the thus obtained first mixture to remove ammonia, thereby obtaining a first intermediate product; mixing the first intermediate product with a second zinc ammonia complex salt solution to obtain a second mixture; heating the second mixture to remove ammonia, followed by conducting a drying process to obtain a second intermediate product; and calcining the second intermediate product to obtain the core-shell zinc oxide particles. A core-shell zinc oxide particle is prepared by the aforementioned method, and a composition for shielding ultraviolet light includes the core-shell zinc oxide particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.