Method for preparing polycarbonate of controlled molecular weight from aromatic bischloroformate
US4743676A · kind A · utility
14Cited by
1References
20Claims
0Family size
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Key dates
| Filing date | May 7, 1987 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | May 7, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Linear polycarbonates of controlled molecular weight are prepared by first reacting a bischloroformate composition with a monohydroxyaromatic compound in a system comprising water, a base and a suitable organic liquid, and then converting the resulting partially capped bischloroformate composition to linear polycarbonate by contact with an interfacial polycarbonate formation catalyst in an alkaline medium. By this method, the efficiency of the capping agent is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.