Process for recovering support from photographic film

Details Process for recovering support from photographic film Process for recovering support from photographic film

1990-04-11

1991-05-21

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Stripping process or element

430262, 430329, 430347, 430432, 430531, 430539, G03C 1112

Patent

active

050174550

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.

REFERENCES:
patent: 2850411 (1958-09-01), Bratring
patent: 3291610 (1966-12-01), Abbott et al.
patent: 3620737 (1971-11-01), Etter

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