Catalyst for the copolymerization of epoxides with CO.sub.2
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United States of America Patent
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Jun 25, 1991
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app pub date -
Apr 20, 1990
filing date -
Jun 7, 1989
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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.
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