Process for polymerizing olefins in the presence of an...

Details Process for polymerizing olefins in the presence of an... Process for polymerizing olefins in the presence of an...

2006-08-08

2010-12-14

Wu, David (Department: 1796)

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

Synthetic resins

Polymerizing in two or more physically distinct zones

C526S067000, C526S070000, C526S086000, C526S352000

Reexamination Certificate

active

07851567

ABSTRACT:
The present invention relates to a process for the preparation of multimodal ethylene homo- or copolymers in at least two stages, the process comprising preparation of a first ethylene homo- or copolymer fraction in a loop reactor in slurry phase, preparation of a second ethylene homo- or copolymer fraction in a gas phase reactor, by using a catalyst not containing an inorganic oxide support, and operating the gas phase reactor in such conditions that at least part of the gas is recycled, and that at least a part of the recycled gas is condensed and the (partially) condensed gas is re-introduced into the gas phase reactor.

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