Method for producing formaldehyde/CO2 copolymers
AssigneeCovestro Deutschland AG
InventorsThomas Ernst Müller, Christoph Gürtler, Henning Vogt, Mario Krautschick, Walter Leitner
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Abstract
The invention relates to a method for producing non-alternating formaldehyde/CO2 copolymers, said method comprising the step of reacting formaldehyde or a compound that releases formaldehyde with carbon dioxide in the presence of a catalyst system. Said method is characterized in that the catalyst system comprises a Lewis acid component and a basic component, the Lewis acid component being at least temporarily coordinatively unsaturated under reaction conditions and the basic component having a pKb value of >=0.
Claims18
A process for preparing nonalternating formaldehyde/CO2 copolymers, the process comprising the step of reacting formaldehyde or a formaldehyde-releasing compound with carbon dioxide in the presence of a catalyst system, wherein the catalyst system comprises a Lewis-acidic metal component selected from the group consisting of boron, tin, zinc, copper, bismuth, molybdenum, tungsten, vanadium, and combinations thereof, and a basic component with a pKb of ≧0, wherein the catalyst system takes the form of a frustrated Lewis pair, and the Lewis-acidic component under reaction conditions is at least intermittently coordinatively unsaturated.
A process for preparing nonalternating formaldehyde/CO2 copolymers, the process comprising reacting formaldehyde or a formaldehyde-releasing compound with carbon dioxide in the presence of a catalyst system, wherein
- the catalyst system comprises a Lewis-acidic component, and a basic component with a pKb of ≧0, wherein the catalyst system takes the form of a frustrated Lewis pair, and the formaldehyde/CO2 copolymer has a molar ratio of formaldehyde units to CO2 units between >1:1 and 30:1, and a number-average molecular weight of 400 to 5000 g/mol.
Dependencies are inferred from the claim text.