Magnetic recording medium and process for producing the same
US4693927A · kind A · utility
32Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1985 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Mar 15, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31699
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium has an improved protective film covering a thin magnetic metal thin film provided on a non-magnetic support. The protective film consists of a plurality of layers formed by plasma polymerization, the base layer of which has a density of 0.7 to 1.5 g/cm.sup.3 and the surface layer of which has a density of not less than 1.2 g/cm.sup.3. This magnetic recording medium has good scratch resistance, weather resistance and abrasion resistance in addition to extremely small spacing loss. The magnetic recording medium can be produced by plasma polymerization of a wide variety of monomeric compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.