Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Reexamination Certificate
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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Andtsjoe Henrik
Bergstra Michiel
Karlsson Ralf
Nyfors Klaus
Thorngren Urban
Borealis Technology Oy
Eng Elizabeth
Roberts Mlotkoski Safran & Cole, P.C.
Wu David
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