Method for preparing linear polycarbonate from cyclic oligomer with aryl carbanion generating catalyst
US4605731A · kind A · utility
59Cited by
4References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 16, 1985 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Apr 16, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Cyclic polycarbonate oligomers are converted to linear polycarbonate resins by heating with a polycarbonate formation catalyst which generates aryl carbanions at temperatures up to about 300.degree. C. The preferred catalysts are tetraarylborates such as tetramethylammonium tetraphenylborate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.