Borealis Ag

Borealis Technology Oy

Jari Hatonen

Markku Vahteri

Siw Bodil Fredriksen

Petri Rekonen

Thomas Garoff

Klaus Nyfors

Bill Gustafsson

Arild Follestad

Virginie Eriksson

Jari Aarila

Irene Helland

Henrik Andtsjo

Mikko Lylykangas

Katrin Nord-Varhaug

Jorunn Nilsen

Marit Seim

Eira Johansson

Karl Isak Skau

Process and apparatus for recovering polymer from a gas phase reactor having a distribution plate via an outlet vessel comprising at least one apparatus for the breakup of polymeric agglomerates, the apparatus further comprising a feed pipe connecting the gas phase reactor and the outlet vessel a return gas line connecting the gas phase reactor and the outlet vessel, means for varying the flow rate through the return gas line from the outlet vessel to the gas phase reactor, and means for varying the outlet rate of polymer product from the outlet vessel.

Method for recovering polymer and apparatus therefor

A multimodal linear low density polyethylene polymer having a final density of 900 to 940 kg/m, and containing at least one &#x3b1;-olefin comonomer in addition to ethylene comprising: (A) 30 to 60 wt % of a lower molecular weight component being an ethylene homopolymer or a copolymer of ethylene and at least one &#x3b1;-olefin; and (B) 70 to 40 wt % of a higher molecular weight component being a copolymer of ethylene and at least one &#x3b1;-olefin, said &#x3b1;-olefin being the same or different from any &#x3b1;-olefin used in component (A) but with the proviso that both components (A) and (B) are not polymers of ethylene and butane alone; wherein the multimodal LLDPE has a dart drop of at least 700 g; and wherein components (A) and (B) are obtainable using a Ziegler-Natta catalyst.

Multi-stage process for producing multimodal linear low density polyethylene polymers

The present inventions relates to a process for producing polyethylene compositions comprising polymerizing polyethylene resins in a cascaded multi-stage reaction in which the reaction steps are performed in at least two slurry phase reactors (A) and (B) and at least one gas phase reactor (C) which are arranged in series in any order wherein in reactor (A) a low molecular weight ethylene homo- or copolymer fraction having a MFRof 100 to 2000 g/10 min, in reactor (B) a low molecular weight ethylene homo- or copolymer fraction having an MFRof 100 to 2000 g/10 min, and in reactor (C) a high molecular weight ethylene copolymer fraction are polymerized, and further comprising a compounding step after polymerization, wherein the final polyethylene composition has a MFRof 3 to 50 g/10 min, the melt flow rates being determined according to ISO 1133.

Multi-stage process for producing polyethylene with lowered gel formation

Growing community of inventors

Porvoo, Finland

Jari Hatonen