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US 5,849,804 AGranted
Recovery of polyamides from composite articles
AssigneeBASF SE
InventorsArlen K. Sarian, Alan C. Handermann, Simon Jones, Edward Alan Davis, Atish Adhya
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Abstract
A process for recovering polyamide from composite articles that contain polyamide involves (a) subjecting at substantially nondepolymerizing conditions the composite article to a solvent for polyamide for a time sufficient to dissolve substantially all of the polyamide and leaving an insoluble fraction; (b) separating insoluble fraction of the composite article from the dissolved polyamide; and (c) precipitating the dissolved polyamide with appropriate precipitants.
Claims6
A process for recovering polyamide from composite articles that contain polyamide comprising:
- (a) subjecting, at up to about 100.degree. C., the composite article to a solvent selected from the group consisting of:
- organic acids;
- inorganic acids;
- phenols;
- cresols;
- alcoholic solutions of alkaline earth halides;
- aromatic alcohols;
- glycols;
- lactams;
- lactones and combinations thereof for between about 2 to about 30 minutes as sufficient to dissolve substantially all of the polyamide and leave an insoluble fraction;
- (b) separating the insoluble fraction from the dissolved polyamide;
- and
- (c) precipitating the dissolved polyamide with a precipitant selected from the group consisting of water and dilute acid solutions.
10 more elements
Dependencies are inferred from the claim text.