Liquid suspensions and powders of cerium oxide particles and polishing applications thereof
US8317888B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2007 |
| Grant date | Nov 27, 2012 |
| Priority date | — |
| Expiry date | Mar 20, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Suspensions of cerium oxide particles in which the particles (secondary particles) have an average size not exceeding 200 nm, such secondary particles being comprised of primary particles having an average size not exceeding 100 nm with a standard deviation having a value not exceeding 30% of the value of this average size, are prepared from a solution of a cerium-III salt, including cerium IV or hydrogen peroxide, which is contacted with a base in the presence of nitrate ions and in an inert atmosphere; the medium thus obtained is subjected to a thermal processing in an inert atmosphere, then acidified and scrubbed and the powder is obtained by drying and calcining of the suspension, which suspension and powder are useful for polishing applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.