Recovery of polyester from spent film

Details Recovery of polyester from spent film Recovery of polyester from spent film

1992-09-16

1996-06-04

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

521 485, 524360, 524518, C08J 1104, C08K 507

Patent

active

055233295

ABSTRACT:
Spent photographic film having at least a polyester base, blue dye, and a polyvinylidene binder layer, and from which the photographic emulsion has been removed, is treated to recover usable polyester. The spent photographic film is heated in cyclohexanone at a temperature sufficient and for a time sufficient to remove both polyvinylidene and dye compounds from the polyester base. The recovered polyester may then be mixed with virgin polyester and extruded to produce a polyester product comprising in part recovered polyester and in part virgin polyester.

REFERENCES:
patent: 3503904 (1970-03-01), Dietz et al.
patent: 3873314 (1975-03-01), Woo et al.
patent: 4078916 (1978-03-01), Gerber et al.

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