Magnetic recording medium
US4621008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1984 |
| Grant date | Nov 4, 1986 |
| Priority date | — |
| Expiry date | Oct 18, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2969
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium for use in video and other applications is presented which comprises a substrate, a continuous thin magnetic layer of cobalt and at least one selected from nickel, chromium, and oxygen, preferably obliquely evaporated on the substrate, and a topcoat formed over the magnetic layer and made of a phosphate compound having the formula: ##STR1## where R is selected from the group consisting of substituted or unsubstituted alkyl radicals having 10 to 22 carbon atoms which may be saturated or have an unsaturated double bond in their backbone, and substituted or unsubstituted aryl, alkaryl, aralkyl and alkylarylalkyl radicals having 6 to 20 carbon atoms, and PA1 Y.sup.1 and Y.sup.2 may be the same or different and selected from the group consisting of hydrogen atom, cations, and substituted or unsubstituted alkyl and aryl radicals, the alkyl radicals being saturated or having an unsaturated double bond in their backbone, and Y.sup.1 and Y.sup.2 may together represent a divalent cation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.