Process for gas phase polymerization of olefins

A process of polymerizing olefins comprising polymerizing at least one olefin monomer under gas phase polymerization conditions in the presence of a catalyst system that includes a solid catalyst component, said solid catalyst component including a transition metal, said transition metal being a metal of Group 4 of the Periodic Table, a metal of Group 5 of the Periodic Table, chromium or mixtures thereof, and a cocatalyst component which is an organometallic compound of a metal of Group 1, 2, 12 or 13 of the Periodic Table, wherein said metal of said organometallic compound and said transition metal of said solid catalyst component are present in said catalyst system in a molar ratio of between about 30:1 to about 40:1, said solid catalyst component introduced into a cylindrical section of a vertically disposed reactor in a first stream and said cocatalyst component introduced into said cylindrical section of said vertically disposed reactor in a second stream, said second stream optionally including at least one olefin monomer, said first and said second streams simultaneously separately introduced into said reactor by a linear distance of no more than about 10% of the inside diameter of said cylindrical section of said vertically disposed reactor.