Recovery of silver and other valuable constituents from polyeste

Details Recovery of silver and other valuable constituents from polyeste Recovery of silver and other valuable constituents from polyeste

1977-04-05

1978-03-14

Vertiz, O. R.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75118P, 260 23, 134 13, C22B 1100, C08J 1104

Patent

active

040789160

ABSTRACT:
Scrap photographic film comprising at least a four component system involving a polyalkyleneterephthalate film base, an adhesive or subbing layer utilizing a terpolymer consisting chiefly of polyvinylidenechloride and a gelatin layer containing metallic silver or a compound thereof and a variety of contaminants such as causal dirt, dyes and the like is broken down for recovery of the valuable constituents therein including the silver, the polyvinylidenechloride terpolymer, and the polyesters by treating the chopped photographic film at an elevated temperature with a solvent for both the polyester and polyvinylidenechloride values in which solvent both the gelatin and silver values are insoluble, under conditions chosen to insure the quantitative recovery of the silver values.

REFERENCES:
patent: 3696058 (1972-10-01), Teti
patent: 3701741 (1972-10-01), Meyer et al.
patent: 3836486 (1974-09-01), Hafner
patent: 3873314 (1975-03-01), Woo et al.
patent: 3912664 (1975-10-01), Wainer
patent: 3929466 (1975-12-01), Moynahan et al.
patent: 3935169 (1976-01-01), Reen
patent: 4009048 (1977-02-01), Jensen
Kovshak et al., Polyesters, Pargamon Press, N. Y. (1965), pp. 298, 299.
Morton, Laboratory Technique in Organic Chemistry, McGraw-Hill Inc., NY (1938), pp. 147-153.
Roberts et al., An Introduction to Modern Experimental Organic Chemistry, Holt, Rhinehart & Winston, Inc., NY (1969), pp. 35-43.

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