Polyester polymer recovery from dyed polyester fibers

Details Polyester polymer recovery from dyed polyester fibers Polyester polymer recovery from dyed polyester fibers

1977-04-07

1979-01-30

Briggs, Sr., Wilbert J.

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

Synthetic resins

Treating polymer containing material or treating a solid...

260 23, 528492, 528493, 528494, 528495, 528272, 528308, C08J 300, C08G 6316, C08J 702

Patent

active

041373936

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 by the process of stripping the dye from the dyed polyester fibers and dissolving the polyester fibers in a solvent in a separate but functionally interrelated (with the dye stripping step) step; separating the dissolved fibers from any undissolved impurities, and thereafter separating the solvent from the polyester without precipitating the polyester by evaporating the solvent.

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patent: 3701741 (1972-10-01), Meyer, Jr. et al.
patent: 3873314 (1975-03-01), Woo et al.
patent: 3935169 (1976-01-01), Reen

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