Photographic element having a transparent magnetic recording layer
US5434037A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Jun 1, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/72
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A photographic element comprising a support having provided thereon a light-sensitive layer, a transparent magnetic recording layer, and a transparent abrasive layer coated over the transparent magentic recording layer, the transparent magnetic recording layer comprising a transparent polymeric binder and ferro-magnetic particles having a surface area greater than 30 m.sup.2 /gm and a coverage of from about 1.times.10.sup.-11 mg/.mu.m.sup.3 to about 3.times.10.sup.-10 mg/.mu.m.sup.3, the abrasive layer comprising a transparent polymeric binder and abrasive particles having a median diameter of from about 0.2 to about 0.4 .mu.m, a specific surface area greater than 5 m.sup.2 /gm, a Mobs hardness of at least 6 and being present in an amount of at least about 5.times.10.sup.-12 mg/.mu.m.sup.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.