| abstract |
A process for the preparation of an acrylic or methacrylic acid ester comprises transesterifying an acrylic or methacrylic acid ester of a C1-4 alcohol with a monohydric alcohol different from that esterified in the starting material in the presence of a catalyst system comprising a combination of compounds A and B wherein A represents the compound Lin Y, wherein Y represents halide or chlorate or carbonate or the salt of a carboxylic acid with 1 to 6 carbon atoms or an alkoxide with 1 to 4 carbon atoms, hydroxide or oxygen and n represents 1 or 2, depending on the valency of Y, and X represents the compound CaXq wherein X represents oxygen or chloride and q represents 1 or 2, depending on the valency of X, with the proviso that at least one of the two anionic components X and Y should contain oxygen. |