Process for the preparation of a polycarbonate with piperidinyl pyridine catalyst
US5168112A · kind A · utility
4Cited by
1References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1991 |
| Grant date | Dec 1, 1992 |
| Priority date | — |
| Expiry date | Jan 8, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/307
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polycarbonate is produced by melt-polycondensing a dihydric hydroxy compound and a bisarylcarbonate in the presence of 4-(4-methyl-1-piperidinyl)-pyridine, or a salt thereof, as a catalyst. The process of the invention eliminates the use of poisonous phosgene, prevents chloride ions from being incorporated into the product polycarbonate and remains in the reaction system longer to enable the preparation of high-molecular weight polycarbonates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.