Process for recovering support from photographic film
US5017455A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 11, 1990 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Apr 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C11/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for recovering a support from a photographic film is disclosed. The photographic film comprises the support and an undercoating layer provided thereon. The support is made of cellulose triacetate film base. The undercoating layer contains gelatin and cellulose nitrate. According to the present invention, the process comprises the steps of: (I) treating the photographic film with an aqueous solution of a surfactant; and then (II) treating the photographic film with an aqueous solution of a protease to remove the undercoating layer from the support. The aqueous solution of the protease used at the step of (II) preferably further contains an anionic surfactant. It is also preferred that the process further contains the step of (III) treating the recovered support with an aqueous solution of hydrogen peroxide to bleach the support.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.