Magnetic recording medium
US4591528A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Aug 1, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium comprising a plastic base film, a magnetic layer formed on one side of the base film and composed of a ferromagnetic alloy powder dispersed in a resin binder, and a backing layer formed on the other side of the base film, characterized in that said ferromagnetic alloy powder has a surface area of at least 48 m.sup.2 /g as measured by BET method, said magnetic layer has a coercive force of at least 1,000 Oe and a surface roughness of at most 0.08 .mu.m, and said backing layer is composed essentially of a thermoset or radiation-cured resin and carbon black dispersed in the resin, and has a surface roughness of from 0.05 to 0.6 .mu.m, said carbon black having an average particle size of from 10 to 60 .mu.m as measured by an electron microscope.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.