Polishing composition for a substrate for a magnetic disk and polishing method employing it
US6811583B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 2002 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Dec 24, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09G1/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A polishing composition for a substrate for a magnetic disk, which comprises:(a) a polishing accelerator composed of at least one compound selected from the group consisting of malic acid, glycolic acid, succinic acid, citric acid, maleic acid, itaconic acid, malonic acid, iminodiacetic acid, gluconic acid, lactic acid, mandelic acid, crotonic acid, nicotinic acid, aluminum nitrate, aluminum sulfate and iron(III) nitrate,(b) an edge sagging preventive agent composed of at least one compound selected from the group consisting of a polyvinylpyrrolidone, a polyoxyethylene sorbitan fatty acid ester and a polyoxyethylene sorbit fatty acid ester,(c) at least one abrasive selected from the group consisting of aluminum oxide, silicon dioxide, cerium oxide, zirconium oxide, titanium oxide and silicon carbide, and(d) water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.