Continuity Additive for Polyolefin Polymerization Processes

A process for copolymerizing ethylene and an alpha olefin in a gas phase reactor utilizing a metallocene catalyst, activator and support, comprising:

• combining reactants comprising ethylene and a monomer selected from the group consisting of 1-butene, 1-hexene, 4-methylpent-1-ene, 1-octene, and any combination thereof in the presence of a metallocene catalyst, an activator and a support;
• monitoring static in the gas phase reactor by a probe selected from the group consisting of a recycle line static probe, an upper bed static probe, an annular disk static probe, a distributor plate static probe, and any combination thereof;
• maintaining the static at a desired level by use of a hindered amine light stabilizer, the hindered amine light stabilizer present in the gas phase reactor in the range from about 0.01 ppmw to about 500 ppmw, based on the weight of polymer produced in the process.

A catalyst system comprising:

• a polymerization catalyst comprising a mixed catalyst, the mixed catalyst comprising at least one metallocene component and at least one non-metallocene catalyst component;
• and
• a hindered amine light stabilizer.