Process for the preparation of carbonic acid esters
US4331610A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1980 |
| Grant date | May 25, 1982 |
| Priority date | — |
| Expiry date | Jan 17, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of carbonic acid esters of mono- or polyalcohols, which is characterized in that urethanes are reacted with monoalcohols or with polyalcohols in a molar ratio of alcohol to urethane group of at least 1 to 1, in the presence of a catalyst, at reaction temperatures of between 120.degree. C. and 270.degree. C. The present invention thus also relates to a process for the preparation of oligocarbonates and of polycarbonates, which is characterized in that monourethanes or bisurethanes are reacted with primary dialcohols in a molar ratio of about 1.5:1 to about 1:1.5, together with monoalcohols, in the presence of catalysts, at reaction temperatures of between 120.degree. C. and 270.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.