Photographic element containing thinb transparent magnetic recording layer and method for the preparation thereof
US5254449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1991 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Dec 13, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/136
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic element comprising a photosensitive layer, a flexible cellulose organic ester support film, and a substantially transparent magnetic recording layer having a dried thickness of less than about 1.5 micron exhibits improved magnetic and photographic performance and is particularly valuable as a color or black and white negative or reversal film. A method of preparing the above-described element comprises the steps of PA0 continuously extruding a layer of a cellulose organic acid ester solution from a hopper toward a polished casting surface which is moving relative to the hopper; PA0 continuously extruding simultaneously a layer of a magnetic dispersion from the same hopper onto the extruded layer of cellulose organic acid ester; PA0 depositing the combined layers onto the casting surface with the cellulose organic acid ester layer engaging the polished surface; and PA0 stripping the combined support film and magnetic recording layer from the casting surface when the layers are sufficiently set to be self-supporting and to allow such stripping. The method is more efficient and less costly than prior art processes and avoids the need for large quantities of solvents and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.