Recovery of polyester from spent film
AssigneeWellman, Inc.
InventorsTony C. Moore, Carl S. Nichols, Joseph C. Tucker
Life of this patent
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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.
Claims3
A polyester fiber comprising;
- polyester;
- cyclohexanone present in an amount greater than 0% up to about 0.06% by weight based on the weight of the polyester;
- blue dye present in an amount greater than 0% up to 0.5% by weight based on the weight of the polyester;
- and
- polyvinylidene chloride present in an amount greater than 0% up to about 15 ppm by weight based on the weight of the polyester.
A polyester product comprising:
- polyester;
- cyclohexanone present in an amount greater than 0% up to about 0.22% by weight based on the weight of the polyester;
- blue dye present in an amount greater than 0% up to about 2% by weight based on the weight of the polyester;
- and
- polyvinylidene chloride present in an amount greater than 0% up to about 60 ppm by weight based on the weight of the polyester.
Dependencies are inferred from the claim text.