Low shear process for polycarbonate purification
US9617381B2 · kind B2 · utility
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8References
20Claims
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Key dates
| Filing date | Jul 25, 2014 |
| Grant date | Apr 11, 2017 |
| Priority date | — |
| Expiry date | Jul 25, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In another embodiment, a process of purifying an interfacially polymerized polycarbonate from a feed comprising an aqueous phase and an organic phase comprising an organic solvent, the interfacially polymerized polycarbonate, a catalyst, and ions, can comprise: separating the aqueous phase and the organic phase from the feed, wherein during the separating the feed is subjected to at least one of: energy of less than or equal to 0.5 kJ/kg of feed, a shear rate of less than 150,000 S−1, and centrifugal forces of 100 to 2,000 g-force; to form a purified aqueous phase and a purified organic phase comprising a purified polycarbonate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.