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AssigneeMonsanto Company
InventorsNorman C. Sidebotham, Paul D. Shoemaker, Clarence W. Young, III
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Polyester polymer is recovered from mixed collections of fibers in the form of fibers, filaments, or fabrics (including dyed or undyed fibers other than polyester fibers as well as dyed polyester fibers) and used in the production of new undyed fibers, films and other polymer products through the process of stripping the dye from the polyester fibers by contacting the fabrics with a dye stripping solvent for polyester polymer which is preferably not a solvent for fibers other than polyester fibers at a temperature below which the polyester fibers dissolve and above which the crystalline lattice of the polyester fibers swell so as to release the dye; then removing essentially all of the dye-containing dye-stripping solvent which is not absorbed by the fibers; then contacting the solvent-laden fibers (which may contain residual dye) with sufficient additional solvent under selective dissolution conditions for polyester fibers; then removing the undissolved fibers and any other undissolved impurities from the solution; thereafter precipitating the polyester out of; and, separating the polyester from the solution.
A process for separation, recovery and reuse in production, of polyester polymer from collections of fibers comprising a first polyester fiber component comprising polyester fibers selected from the group consisting of dyed fibers and undyed fibers and a second component consisting of fibers other than polyester fibers, said process comprising:
Dependencies are inferred from the claim text.