Magnetic recording medium
US4598014A · kind A · utility
9Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1984 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | Nov 16, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium is disclosed. The medium comprises a non-magnetic support having provided on opposite surfaces a magnetic recording layer and a backing layer containing two types of carbon black and a binder and having a thickness of 2 .mu.m or less, one of said carbon black being fine carbon black having an average particle size of 30 to 100 m.mu. and the other of said carbon black being coarse carbon black having an average particle size of 150 to 500 m.mu., and the mixing weight ratio of said carbon black and the binder being 1:1.5 to 1:3.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.