abstract |
A catalyst active in the polymerization of ethylene or the copolymerization of ethylene with unsaturated monomers consists of a nickel complex catalyst bonded to a polystyrene substrate, and definable by the general formula (I): ##STR1## where R, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 have the meanings given in the description. n The preparation is described of the catalyst and its use in the polymerization of ethylene and the copolymerization of ethylene with other unsaturated monomers. |