Magnetic recording medium
US5789063A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Aug 9, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium comprising a support and a magnetic layer comprising a ferromagnetic metal powder and a binder formed on said support, wherein the magnetic layer has a surface roughness of 10 nm or smaller, a coercive force of 1,580 Oe or greater and a decreasing ratio .DELTA.Bs of a saturation flux density (a change rate of saturation flux density Bs' of the magnetic layer realized after the magnetic recording medium has been allowed to stand in an environment, the temperature of which is 60.degree. C. and the relative humidity of which is 90% for 30 days, as compared with saturation flux density Bs of the magnetic layer before the magnetic recording medium is allowed to stand, the change rate being a value expressed by an equation .DELTA.Bs=(1-Bs'/Bs).times.100) of 10% or lower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.