Magnetic recording medium
US10068603B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2008 |
| Grant date | Sep 4, 2018 |
| Priority date | — |
| Expiry date | Sep 7, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2050/023
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A magnetic recording medium includes a nonmagnetic substrate and at least a magnetic layer, a protective layer, and a lubricating layer provided on the nonmagnetic substrate. The magnetic recording medium is characterized in that the lubricating layer is formed of a lubricating agent represented by general formulas (1), (2) or (3), in which substituents R1, R2, R3, and R4 in the lubricating agent represent organic groups, at least one of the substituents R1 and R2 at the end part of the lubricating agent and the substituents R3 and R4 contain a plurality of functional groups, and the shortest distance between the functional groups is a distance of three or more atoms, preferably five atoms. The magnetic recording medium may be used for a heat assisted recording method in which the temperature of the magnetic layer reaches 150° C. to 200° C. The magnetic recording medium is characterized in that the amount of the lubricating agent volatilized in the lubricating layer is less than 10% of the initial layer thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.