Polyester polymer recovery from dyed polyester fabrics

Details Polyester polymer recovery from dyed polyester fabrics Polyester polymer recovery from dyed polyester fabrics

1975-02-24

1977-01-18

Phynes, Lucille M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

264 37, 264 49, 264344, D06M 900, C08G 6370

Patent

active

040038815

ABSTRACT:
Polyester polymer is recovered from polyester fibers (in the form of filaments, yarns or fabrics and the like, both dyed and undyed), and used in the production of new undyed fibers, films, and other polymer products through the process of: stripping the dye from the dyed polyester fibers by contacting the fibers with a dye-stripping solvent for polyester polymer 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 and fabrics; then contacting the wet solvent-laden fibers, possibly containing residual dye, with sufficient addition of a dissolution solvent under dissolution conditions for polyester fibers; thereafter precipitating the polyester out of; and, separating the polyester from the solution.

REFERENCES:
patent: 2938811 (1960-05-01), Hermes
patent: 3159964 (1964-12-01), Kretsch
patent: 3716614 (1973-02-01), Okamoto et al.
patent: 3943105 (1976-03-01), Hermes

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