Ethylene polymerization process

Details Ethylene polymerization process Ethylene polymerization process

2006-11-30

2009-10-13

Ryan, Patrick (Department: 1795)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in two or more physically distinct zones

C526S064000, C526S073000, C526S116000, C526S119000, C526S123100, C526S160000, C526S943000, C526S352000, C526S348000, C526S090000, C526S905000, C525S240000, C525S053000

Reexamination Certificate

active

07601787

ABSTRACT:
A process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a Ziegler-Natta catalyst system in two slurry reaction zones. Most of the polyethylene (70-95 wt. %) is produced in one of the zones, while a smaller fraction is produced in the other zone. The ratio of the weight average molecular weight of the smaller fraction to that of the larger fraction is greater than 8:1. The resulting polyethylene blend, which should have both high melt strength and high extrudate swell, will be useful for blow-molding applications.

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