Rare earth polishing compositions
US4942697A · kind A · utility
13Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1987 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | Jun 25, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K3/1454
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Rare earth glass-polishing compositions of improved homogeneity and reproducibility are prepared by (a) simultaneously continuously admixing a cerium salt solution, a basic solution and a solution of at least one acid and/or one salt, the anion or anions of which being adopted to form insoluble rare earth compounds, the number of equivalents of base being equal to or greater than the number of equivalents of cerium, and the pH of the reaction medium being greater than about 6; (b) filtering the precipitate which results from the reaction medium; (c) drying said recovered precipitate; and (d) calcining said dried precipitate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.