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Title
Verfahren zur Wiedergewinnung von loeslichen Polymeren oder Polymerengemischen aus kunststoffhaltigen Materialien
Date Issued
2005
Author(s)
Luck, T.
Knauf, U.
Maeurer, A.
Waesche, A.
Holley, W.
Patent No
1997-19732673
Abstract
A process for the reclamation of soluble polymer or polymer mixtures from polymeric materials is characterised by: (i) the target polymer of polymer mixture is selectively dissolved from the polymeric material; (ii) unwanted insoluble components are optionally removed from the resulting solution; (iii) unwanted soluble components are optionally removed from solution; (iv) the target polymer or polymer mixture is selectively precipitated by means of turbulent mixing with a precipitating agent in the presence of a gas or gas mixture; (v) separation of the precipitated polymer or polymer mixture from the liquid phase; and (vi) optionally drying the target polymer or polymer mixture. Preferably further soluble target polymer or mixture is dissolved from the separated insoluble components after separation from the resulting suspension and/or the insoluble components undergo a final water washing step. The polymer solution undergoes a chromatographic, preferably a gel permeation chromatograp hy and/or solid phase extraction, preferably with carbon and/or a liquid-liquid extraction step. USE - The process is useful for the recovery of soluble polymers from a mixture. ADVANTAGE - The process uses halogen free solvent and does not result in oxidative crosslinking of the reclaimed polymer which is recovered with high purity and has good thermal and mechanical properties.
Language
de
Patenprio
DE 1997-19732673 A: 19970729