Disk type magnetic recording medium and process of manufacturing the same
US5635294A · kind A · utility
1Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 10, 1993 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | May 10, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/258
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium and a manufacturing process thereof are disclosed. The medium comprises a magnetic layer containing a binder, chromium oxide having an average particle size within the range of 0.3 to 0.5 .mu.m and a metal magnetic powder, wherein the binder comprises a polyurethane resin having a polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM, --PO (OM), and --OPO(OM).sub.2 wherein M represents a hydrogen atom or an alkali metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.