Patent ID: 8431657

Claim:
A two stage polymerization process comprising: in a first reactor, polymerizing ethylene and optionally an alpha olefin in the presence of an organometallic catalyst and a cocatalyst, the cocatalyst comprising an alkylaluminoxane and an ionic activator, wherein the molar ratio of ionic activator to organometallic catalyst fed to the first reactor is less than 1.0; feeding an effluent stream from the first reactor to a second reactor and in the second reactor polymerizing ethylene optionally with an alpha olefin in the presence of an organometallic catalyst and a cocatalyst, the cocatalyst comprising an alkylaluminoxane and an ionic activator, wherein the molar ratio of ionic activator to organometallic catalyst fed to the second reactor is at least 1.5, not including organometallic catalyst and ionic activator present in the effluent stream fed from the first reactor; further provided that the total molar ratio of ionic activator to organometallic catalyst present over both reactors is at least 0.8.