Additive for Polyolefin Polymerization Processes

The process according to any of the previous claims, wherein the polymerization reactor comprising a fluidized bed reactor, an entrainment zone, a catalyst feed for introducing a catalyst system capable of producing the polymer, at least one ethyleneimine additive feed for the feeding of the at least one ethyleneimine additive independently of the catalyst mixture, the process comprising:

• (a) contacting the at least one olefin with the catalyst system under polymerization conditions in the fluidized bed reactor;
• and (b) introducing the at least one ethyleneimine additive into the reactor system at anytime before, during, or after start of the polymerization reaction.

The polymerization process of any preceding claim, wherein the polymerizing comprises feeding a metallocene catalyst, a Ziegler-Natta catalyst, a chromium based catalyst, or a mixed catalyst system to the polymerization reactor.

A process for copolymerizing ethylene and one or more alpha olefins in a gas phase reactor utilizing a metallocene catalyst, activator and support, comprising:

• combining ethylene and one or more of 1-butene, 1-hexene, 4-methylpent-1-ene, or 1-octene in the presence of a metallocene catalyst, an activator and a support;
• monitoring static in said reactor by at least one recycle line static probe, at least one upper bed static probe, at least one annular disk static probe, or at least one distributor plate static probe;
• maintaining the static at a desired level by use of at least one ethyleneimine additive comprising a polyethyleneimine, an ethyleneimine copolymer, or a mixture thereof, the at least one ethyleneimine additive present in said reactor in the range from about 0.1 to about 50 ppm, based on the weight of polymer produced by said combining.

A method for treating at least one interior surface of a fluidized bed polymerization reactor system, comprising:

• contacting at least one of a bed wall, a distributor plate, and a gas recycle line with a ethyleneimine additive comprising a polyethyleneimine, an ethyleneimine copolymer, or a mixture thereof to form a coating comprising the ethyleneimine additive thereupon;
• performing a polymerization reaction in the fluidized bed polymerization reactor system comprising the coating.

A method for screening continuity additives for use in a polymerization reactor, comprising:

• combining at least one continuity additive with a polymerization catalyst system;
• and
• measuring any exotherm resulting from the admixing.

A catalyst system comprising:

• at least one polymerization catalyst;
• and
• a polyethyleneimine or an ethyleneimine copolymer.