Magnetic recording medium
US5045390A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1989 |
| Grant date | Sep 3, 1991 |
| Priority date | — |
| Expiry date | Apr 17, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/257
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium is disclosed. The magnetic recording medium is capable of high density recording; has excellent electromagnetic conversion properties including S/N ratio; whose magnetic powder has good dispersibility and good corrosion resistance; and that has good durability. The magnetic recording medium comprises a binder and magnetic metal powder dispersed in the binder and the magnetic metal powder has a specific surface area of not less than 45 m.sup.2 /g, and comprises comprise iron atoms and aluminum atoms in an abundance ratio of from 100:1 to 100:20 in terms of the number of atoms, and abundance ratio of iron atoms to aluminum atoms in the superficial portion of individual particles of the magnetic powder is from 30:70 to 70:30 in terms of the number of atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.