Melt catalytic preparation of copolymeric polycarbonate from hydroquinone
US5324809A · kind A · utility
8Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1992 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Jun 24, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/307
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a method of preparing a copolymeric polycarbonate which comprises melt-polycondensing a mixture of an aromatic dihydroxy compound comprising hydroquinone or substituted hydroquinones and a diester carbonate in the presence of a catalyst containing alkali metal compounds and/or alkaline earth metal compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.