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Abstract

A process for the preparation of a solution of a catalyst system, suitable for use in a process for copolymerizing carbon monoxide and one or more ethylenically unsaturated compounds, which comprises (a) combining a palladium compound, a bisphosphine of the general formula R.sup.1 R.sup.2 P-R-PR.sup.3 R.sup.4 (I) wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represents an aromatic hydrocarbyl group which is substituted with an alkoxy group and R represents a bivalent bridging group containing at least two carbon atoms in the bridge, and a lower alcohol as solvent, and (b) admixing the obtained combination after a generation period G, during which a temperature T in the range of 0.degree.-70.degree. C. is maintained, with an acid having a pKa of less than 2, whereby the said generation period G is selected such that the value for G (in hours) and the temperature T (in .degree.C.) are related as ##EQU1##

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