Patent ID: 8492489
Filing Date: 2013-07-23
Classification: B01J,C08F,Y10S,Y10T

Abstract:
1. A method for the copolymerization of ethylene and a C 3+ olefin comonomer in a loop reactor system comprising: a) introducing an ethylene monomer, a C b) supplying at least one polymerization catalyst system to said reactor system; c) circulating said diluent liquid, ethylene monomer, and alpha olefin copolymer through said loop reactor while copolymerizing said ethylene and said alpha olefin monomer in the presence of said catalyst system to produce a slurry of polymer fluff particles in said diluent carrier liquid; d) discharging a portion of said slurry of polymer fluff particles from said reactor system; and e) introducing an ethylene monomer co-feed into said loop reactor at least two spaced locations downstream of the point of introduction of ethylene comonomer and diluent in subparagraph a), wherein the locations are chosen to reduce the variation in the comonomer/monomer ratio in the loop reactor to less than 40% wherein said loop reactor system comprises at least two series connected loop reactors and wherein subparagraphs a), b), c) and e) are carried out in at least one of said loop reactors.