Olefin polymerization catalysts, their production and use

A process for polymerizing olefins comprising combining ones or more olefins with a catalyst system comprising the reaction product of one or more activators selected from alumoxanes, modified alumoxanes or ionizing activators, and one or more heteroatom substituted phenoxide Group 4 to 10 transition metal or lanthanide metal compounds wherein the metal is bound to the oxygen of the phenoxide group and provided that:

• a) if more than one heteroatom substituted phenoxide is present it is not bridged to the other heteroatom substituted phenoxide,
• b) if the metal is a Group 4 metal then the carbon ortho to the carbon bound to the oxygen of the phenoxide is not bound to an aldehyde or an ester,
• c) the carbon ortho to the carbon bound to the oxygen of the phenoxide is not bound to the C1 carbon in a group represented by the formula:
• d) if the metal is a Group 4 metal then the ortho and meta carbons do not form a pyridine ring, and
• e) the heteroatom substituted phenoxide group contains one or more heteroatom(s) wherein the heteroatom(s) is selected from the group consisting of boron, aluminum, silicon, nitrogen, phosphorus, arsenic, tin, lead, antimony, oxygen, selenium and tellurium,
• wherein R6 and R7 are independently hydrogen, halogen, a hydrocarbon group, a heterocyclic compound residue, an oxygen containing group, a nitrogen containing group, a boron containing group, a sulfur containing group, a phosphorus containing group, a silicon containing group, a germanium containing group, or a tin containing group, and R6 and R7 may be bonded to each other to form a ring.