Copolymeric polycarbonate production method
US5484875A · kind A · utility
8Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 1995 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | May 19, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/307
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a method for preparing copolymeric polycarbonates which comprises melt polycondensing a mixture of an aromatic dihydroxy compound containing an amount of 2-90 mol % of hydroquinone or substituted hydroquinones and a diester carbonate in the presence of a catalyst containing an alkali metal compound or an alkaline earth metal compound in an amount of 1.times.10.sup.-8 to 5.times.10.sup.-6 mole per mole of the total amount of the aromatic dihydroxy compound, then adding an acidic compound to the melt polycondensation product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.