Bridged metal complexes for gas phase polymerizations

(New) an olefin polymerization process comprising contacting one or more olefin monomers under gas phase polymerization conditions with a catalyst composition comprising a metal complex corresponding to the following formula:

• 22
• wherein:
• M is titanium, zirconium, or hafnium in the +4, +3, or +2 oxidation state;
• Y1 and Y2 are independently an anionic, cyclic or non-cyclic, π-bonded group, NR1, PR1;
• NR12 or PR12;
• Z is boron or aluminum;
• Q is a neutral, anionic or dianionic ligand group depending on the oxidation state of M;
• j is 1, 2 or 3 depending on the oxidation state of M and the electronic nature of Q;
• T independently each occurrence is:
• 23
• wherein R1 is independently each occurrence hydrogen, a hydrocarbyl group, a tri(hydrocarbyl)silyl group, or a tri(hydrocarbyl)silylhydrocarbyl group, said R1 groups containing up to 20 atoms not counting hydrogen;
• R5 is R1 or N(R1)2;
• and
• two R1 groups together or one or more R1 groups together with R5 may optionally be joined to form a ring structure.