Abrasive compound for glass hard disk platter
US7578862B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 2003 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Oct 26, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides an abrasive compound suitable for polishing the surface of a glass substrate for an optical disk platter or a magnetic disk platter. More specifically, the present invention provides an abrasive compound for a glass hard disk platter, characterized as comprising a stable slurry having water and, dispersed therein as an abrasive, cerium(IV) oxide particles having an average secondary particle size of 0.1 to 0.5 μm and containing CeO2 in a concentration of 0.2 to 30 wt %. Preferably, the present invention provides the above abrasive compound in which cerium amounts for 95% or more in terms of oxides of the total amount of rare earth elements in the abrasive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.