Magnetic particles for magnetic recording medium and process for producing the same
US5543069A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1995 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Jul 31, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed herein magnetic particles for magnetic recording which comprise acicular or plate-like magnetic particles and not less than 0.01 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2 and based on the acicular or plate-like magnetic particles) of an oxide or hydroxide containing Al, Si or both Al and Si and adhered to the surfaces of the acicular or plate-like magnetic particles, and which have not less than 0.50 of a molecular-weight-dependent parameter .alpha. represented by the following formula (I): EQU As=K.sub.1 .multidot.M.sup..alpha. (I) wherein M represents a number-average molecular weight of a binder, As represents a saturation adsorption of said binder, and K.sub.1 represents a constant dependent on the binder and a solvent used for measuring As.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.