Magnetic recording medium comprising a magnetic layer containing ferromagnetic metallic powder, binder, and aliphatic acid
US5670245A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 11, 1994 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Jul 11, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a magnetic recording medium which comprises a non-magnetic support and a magnetic layer formed thereon and containing at least ferromagnetic metallic powder, and the medium contains an aliphatic acid, wherein average existence ratios of elements in terms of the number of atoms forming the surface of the ferromagnetic metallic powder which is being subjected to orientation treatment in the magnetic layer, are less than 1 of sodium (Na), 40 or less of alkaline earth elements, and 1 to 50 of rare earth elements based on the number of iron (Fe) atom as 100, and the number of carbon atoms of the aliphatic acid being 12 to 24.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.