Method for quenching of catalyst in the production of low molecular weight polycarbonates
US6177536A · kind A · utility
29Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1999 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | Feb 22, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/406
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Improved performance in high temperature, high vacuum reactors is obtained by quenching alkaline catalyst present in the product a melt polycondensation reaction using a sulfonic acid ester quencher in a carrier. The carrier if formed from a first carrier component effective to solubilize the quencher and having a lower boiling point than the quencher, and a second carrier component soluble in the first carrier component and having a higher boiling point than the quencher. An exemplary carrier composition contains equal parts of diphenylcarbonate and toluene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.