Process for the preparation of polymers of carbon monoxide...

Details Process for the preparation of polymers of carbon monoxide... Process for the preparation of polymers of carbon monoxide...

C - Chemistry, Metallurgy

08

G

402/7.1

C08G 67/02 (2006.01) B01J 31/04 (2006.01) B01J 31/24 (2006.01)

Patent

CA 1338578

Process for the preparation of polymers, characterized in that a mixture of carbon monoxide with one or more olefinically unsaturated compounds is polymerized by contacting the mixture at an elevated temperature and pressure with a solution of a catalyst composition in a diluent in which the polymers are insoluble or virtually insoluble, and which catalyst composition is based upon a) a palladium compound, b) an acid with a pKa of less than 2, and c) a diphosphine of the general formula R1R2P-R-PR3R4, wherein R1-R4 represent the same or different optionally polar-substituted hydrocarbyl groups and R is a bivalent organic bridging group containing at least two carbon atoms in the bridge, in which process the catalyst composition that is used at the outset of polymerization comprises a halogen monocarboxylic acid as component b) in a concentration of less than 6 equivalents per mol of palladium and in which process the acid concentration of the catalyst composition is increased after the polymer con- centration has reached a value of at least 0.2 g per 100 g of polymer suspension, the latter increase being effected either by adding a halogen monocarboxylic acid in such a quantity that the overall concentration of halogen monocarboxylic acid is at least 7 equivalents per mol of palladium or by adding an acid other than a halogen monocarboxylic acid in a quantity of at least 1 equivalent per mol of palladium.

597084

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