Olefin polymerization catalyst

A process to polymerize olefins comprising contacting an olefin with a composition comprising the product of the combination of an activator and a transition metal compound which is represented by the formulae:

• ((Z)XAt(YJ))qMQnTs (I)
• or
• ((R′mZ)XAt(YJR″p))qMQn (II)
• wherein M is a metal selected from a group consisting of Group 3 to 13 transition metal and lanthanide and actinide series of the Periodic Table of Elements;
• T is bonded to M and is an element from Group 13 to 16 and T may also be bound to one or more C1 to C50 groups;
• Q is bonded to M and each Q is a monovalent, bivalent or trivalent anion;
• X and Y are bonded to M;
• X and Y are independently C or a heteroatom, provided that at least one of X and Y is a heteroatom and Y is contained in a heterocyclic ring J, wherein J comprises from 2 to 50 non-hydrogen atoms;
• Z is bonded to X, wherein Z comprises 1 to 50 non-hydrogen atoms;
• t is 0 or 1;
• when t is 1, A is a bridging group joining X and J;
• q is 1 or 2;
• n is (the oxidation state of M -q-s)/2, if Q is a bivalent anion, or n is (the oxidation state of M q-s)/3 if Q is a trivalent anion, s is 1,2 or 3;
• R″ groups are independently selected from the group consisting of hydrogen or linear, branched, cyclic, alkyl radicals, or alkenyl, alkynyl, alkoxy, aryl or aryloxy radicals and two or more R″ groups may be joined to form a cyclic moiety, optionally, an R″ may be joined to A;
• R′ groups that are independently selected from a group consisting of hydrogen or linear, branched, alkyl radicals or cyclic alkyl, alkenyl, alkynyl or aryl radicals, two or more R′ groups may be joined to form a cyclic moiety, optionally, an R′ group may be joined to A;
• m p are independently an integer from 0 to 5;
• and when q is 2, the two ((R′mZ)XAt(YJR″p)) of formula (II) are bridged to each other via a bridging group,
• provided that if the process occurs in the slurry phase then the activator and the transition metal compound are allowed to react for at least fifteen minutes before being contacted with the olefin.