Magnetic recording medium
US4849305A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1986 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Sep 26, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Herein disclosed is an improved magnetic recording medium which comprises a substrate, a magnetic recording layer, if necessary, a protective layer, an adhesion promoting layer and a lubricant layer, respectively applied or deposited on the substrate in the recited order. The magnetic recording medium is characterized in that the difference T.sub.a -T.sub.1) between the specific surface tension T.sub.a of the adhesion promoting layer and the specific surface tension T.sub.1 of the lubricant layer is adjusted to -5 to 30 dyne/cm. The magnetic recording layer according to the present invention is improved in that the lubricant layer is adhered strongly to the adhesion promoting layer so that the lubricant is hardly dissipated at the time of rotation of the magnetic recording medium. Thus the loss in the volume of the lubricant layer decreases. As a result, the properties of the magnetic recording medium such as durability and abrasion resistance are improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.