Patent ID: 8258246
Filing Date: 2012-09-04
Classification: C08F

Abstract:
1. A method for the polymerization of ethylene to provide an ethylene polymer comprising: (a) forming a supported chromium-based polymerization catalyst by (b) providing the supported chromium-based polymerization catalyst to a polymerization reactor zone; (c) supplying a feed stream comprising an inert hydrocarbon diluent containing a minor amount of ethylene to the polymerization reaction zone; (d) incorporating said chromium-based polymerization catalyst into said feed stream within the polymerization reaction zone; (e) operating said reaction zone under polymerization conditions to produce a polyethylene polymer fluff by polymerization of said ethylene monomer; (f) withdrawing said polyethylene polymer fluff from said reaction zone; and (g) heating said polyethylene polymer fluff to a temperature sufficient to melt said fluff and thereafter extruding said heated polymer fluff to produce pellets of said polyethylene polymer.