Patent ID: 6864209

Claim:
A catalytic composition comprising a mixture of: at least one nickel complex containing at least one phosphonite ligand having the general formula LN 1 X 2 in which L is a bidentare or trideniate phosphonite ligand with general formula: in which R represents a monovalent hydrocarbon radical containing up to 12 carbon atoms, and radicals A 1 —O— and A 2 —O—, which are identical or different, are alkoxy radicals carrying a nitrogen-containing heterocycle, and X is a halide anion, an acerylacetonate anion or a carboxylate anion; with at least one hydrocarbylaluminum compound selected from the group consisting of tris(hydrocarbyl)aluminum compounds, chlorinated and brominated hydrocarbylaluminum compounds with general formula AlR″ m Y 3-m in which R″ is a hydcocarbyl radical containing 1 to 6 carbon atoms, Y is a chlorine or bromine atom and m is a number from 1 in 3, and aluminoxanes; in an Al/Ni mole ratio of 8/l or less.