Magnetic recording medium
US4420531A · kind A · utility
26Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1981 |
| Grant date | Dec 13, 1983 |
| Priority date | — |
| Expiry date | Sep 17, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium is composed of a base and a magnetic coating which comprises a binder and a magnetic powder dispersed therein. The magnetic powder, in turn, contains a nonmagnetic powder having an average particle size of not more than 2 .mu.m and a hardness of at least 6 on Mohs scale, in an amount of 1-20% on the basis of the weight of the magnetic powder, and the binder contains a resin such as polyester resin having a group expressed by the formula --SO.sub.3 M where M is monovalent metal such as Na.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.