Polyester polymer recovery from dyed polyester fabrics

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

C - Chemistry, Metallurgy

08

J

403/8

C08J 11/04 (2006.01) C08G 63/00 (2006.01) C08J 11/08 (2006.01)

Patent

CA 1039895

POLYESTER POLYMER RECOVERY FROM DYED POLYESTER FABRICS ABSTRACT OF THE DISCLOSURE 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 at which the crystalline lattice of the polyester fiber swells so as to release the dye, said temperature being below the temperature at which the fibers dissolve in the solvent; 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. - 1 -

246316

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