Reclamation of polymers, that contain styrene in the polymeric backbone, using a water soluble solvent based reclamation process
US5594035A · kind A · utility
21Cited by
6References
10Claims
0Family size
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Key dates
| Filing date | Nov 13, 1995 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Nov 13, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the reclamation of polystyrene and other styrene containing polymers, by dissolving said polystyrene polymer into a water soluble solvent, such as NMP, and then precipitating said polymer away from the water soluble solvent through the addition of the water soluble solvent/styrene polymer solution into water. The particles of the polymer that precipitate out and float to the surface of the water can be collected and dried at temperatures that do not give added heat history to the polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.