Magnetic dispersion
US4990276A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1990 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Feb 1, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/7013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A dispersion consisting essentially of magnetic particles, a dialkylester of phthalic acid which functions as a dispersing medium, and optionally, a dispersing agent is particularly useful as a precursor to a composition suitable for casting onto a cellulose acid ester support film to form a transparent magnetic recording layer for use in photographic films. The dispersion provides magnetic recording layers exhibiting fewer particle agglomerations and reduced light scattering and photographic prints prepared from films containing such magnetic layers exhibit virtually no increase in graininess attributable to the magnetic recording layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.