Catalyst for the copolymerization of epoxides with CO.sub.2
US5026676A · kind A · utility
14Cited by
8References
11Claims
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Key dates
| Filing date | Apr 20, 1990 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Apr 20, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Zinc carboxylate catalysts for the copolymerization of carbon dioxide and epoxides are prepared by the reaction of zinc oxide with glutaric or adipic acid in an aprotic reaction solvent. Azeotropic distillation may be used to separate the water-solvent phase from the reaction mixture, or the catalyst may be separated from the reaction mixture by filtration and drying, generally without the need for repeated washings to remove active hydrogen atom sources. Examples of aprotic reaction solvents are toluene, dibutyl ether, anisole and ethyl benzoate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.