Method for quenching of polycarbonate
US6124422A · kind A · utility
5Cited by
5References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1999 |
| Grant date | Sep 26, 2000 |
| Priority date | — |
| Expiry date | Mar 22, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/307
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polycarbonate produced by reaction in a melt of a diaryl carbonate and a dihydric phenol in the presence of a basic catalyst is quenched to reduce the level of residual catalyst by combining the polycarbonate with a powder-free quenching composition. The quenching composition contains an acidic quencher, such as an alkyl tosylate, in a non-powder carrier. The non-powder carrier may be a liquid or a solid, for example in the form of pellets containing or coated with the quencher.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.