Process for homo-or copolymerization of conjugated olefines

A metal complex catalyst, which is a reaction product of:

• A) at least one metal complex represented by Formula 2:
• wherein:
• MI is lanthanum, cerium, praseodymium, neodymium, or promethium;
• N is nitrogen;
• X, independently each occurrence, is fluoride, chloride, bromide or iodide or an —OR group, wherein R, independently each occurrence, is hydrogen, or a group having 1 to 80 atoms (not counting hydrogen), selected from hydrocarbyl, hydrocarbylsilyl, halo-substituted hydrocarbyl, hydrocarbyloxy-substituted hydrocarbyl, acyl-substituted hydrocarbyl, arylcarbonyl-substituted hydrocarbyl, hydrocarbylamino-substituted hydrocarbyl, hydrocarbylsilyl-substituted hydrocarbyl, acyl or arylcarbonyl;
• D is THF, 1,2-dimethoxyethane, triethylamine, tetramethylethylenediamine, or Et2O or;
• y is the number 1, 2, 3, 4, 5, or 6;
• t is the number 0, 1, 2 or 3;
• RA and RB, independently each occurrence, are each a group having from 1 to 80 atoms (not counting hydrogen), selected from hydrocarbyloxy-substituted hydrocarbyl, hydrocarbylamino-substituted hydrocarbyl, or hydrocarbylsilyl-substituted hydrocarbyl;
• and
• wherein the two ligands (RA)(RB)N are only linked via MI;
• and
• B) at least one activator selected from:
• a) C1-30 organoboron or organoaluminum compounds,
• b) polymeric or oligomeric alumoxanes,
• c) non-polymeric compatible, non-coordinating, ion-forming compounds, and
• d) hydrocarbyl sodium, hydrocarbyl lithium, hydrocarbyl zinc, hydrocarbyl magnesium halide, and dihydrocarbyl magnesium;
• and
• wherein A) and B) are brought together in a reaction medium at a temperature from −78° C. to 250° C.