Catalyst for the copolymerization of epoxides with CO.sub.2
AssigneesAir Products and Chemicals, Inc., Arco Chemical Company, Mitsui Petrochemical Industries, Ltd.
InventorsStephen A. Motika, Timothy L. Pickering, Andrzej Rokicki, Beatrice K. Stein
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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.
Claims11
A zinc carboxylate catalyst for the copolymerization of carbon dioxide and epoxides to form poly (alkylene carbonates) prepared by reacting zinc oxide with a dicarboxylic acid selected from the group consisting of glutaric acid and adipic acid in an aprotic reaction solvent.
A process for the preparation of a zinc carboxylate catalyst for the copolymerization of carbon dioxide and epoxides to form poly (alkylene carbonates) comprising reacting zinc oxide with a dicarboxylic acid selected from the group consisting of glutaric acid and adipic acid in an aprotic reaction solvent.
A process for the preparation of a zinc carboxylate catalyst for the copolymerization of carbon dioxide and epoxides to form poly (alkylene carbonates) comprising reacting a stoichiometric excess of zinc oxide with a dicarboxylic acid selected from the group consisting of glutaric acid and adipic acid in a reaction solvent selected from the group consisting of toluene, dibutyl ether, anisole and ethyl benzoate, separating the zinc carboxylate from the reaction solvent, and drying the zinc carboxylate catalyst.
Dependencies are inferred from the claim text.