Chevron Phillips Chemical Company LP

Borealis Ag

Chevron Phillips Company, L.p.

Kumudini Jayaratne

Qing R Yang

Rex E Murray

Joel L Martin

Gary L Glass

Michael D Jensen

Ted H Cymbaluk

Errun Ding

Albert P Masino

William B Beaulieu

Alan L Solenberger

Steve J Secora

Tony R Crain

Matthew G Thorn

Max P McDaniel

Timo Leinonen

Peter Denifl

Jerry T Lanier

Kalle Kallio

Vasileios Kanellopoulos

Pascal Castro

Apostolos Krallis

Hanna-Leena Rönkkö

Elina Hamalainen

Vuokko Ojanperä

Elina Hämäläinen

The present invention is concerned with a process for polymerizing ethylene or copolymerizing ethylene and at least one alpha-olefin comonomer in the presence of a supported polymerization catalyst in a multi-stage process in which the last polymerization stage is a gas phase reactor, the use of said process for reducing particle carry-over in the last polymerization stage and the use of a supported polymerization catalyst with a certain median particle size to polymerize an ethylene homo- or copolymer in said multi-stage process with a span of its particle size distribution which can be predicted from the median particle size of the catalyst.

Process for polymerizing ethylene in a multi-stage polymerization process

The present invention relates to A Ziegler-Natta catalyst component in the form of solid particles having a median a particle size (D50) of 5 to 200 &#x3bc;m and comprising i) a compound of Group 1 to 3, preferably of Group 2 metal, IUPAC, Nomenclature of Inorganic Chemistry, 1989 ii) a compound of a transition metal of Group 4 to 10, or of a lanthanide or actinide, preferably a transition metal of Group 4 to 6, IUPAC, Nomenclature of Inorganic Chemistry, 1989 and iii) an internal electron donor, wherein the solid particles a have a numerical SPAN of 0.80 or below and a ratio of numerical mode to volumetric mode (Mode/Mode) of 0.60 or more and we Wherein Mode&#x3c;Mode. The invention also relates to a process for producing said catalyst component and use thereof producing Cto C&#x3b1;-olefin polymers, especially propylene or ethylene polymers or copolymers thereof with &#x3b1;-olefins of 2 to 12 C-atoms.

Catalysts

Supported Ziegler-Natta ethylene polymerization procatalyst comprising special bi-(oxygen containing ring) compounds as internal donor, as well as a process for preparing the same and use of such a procatalyst for preparing a catalyst system used in the polymerization of ethylene for producing high molecular weight polyethylenes.

Supported Ziegler Natta procatalyst for ethylene polymerisation

Process for the preparation of a particulate Group 2 metal/transition metal polymerization catalyst component for ethylene polymerization comprising a special bi-(oxygen containing ring) compound as internal donor, and to the use of such a catalyst component for preparing a catalyst used in the polymerization of ethylene.

Process for producing a Ziegler Natta procatalyst for ethylene polymerisation

The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.

Dual metallocene catalyst systems for decreasing melt index and increasing polymer production rates

The present invention provides polymerization catalyst compositions employing novel dinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.

Nano-linked metallocene catalyst compositions and their polymer products

The present invention provides polymerization catalyst compositions employing novel heterodinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization of olefins are also provided.

Nano-linked heteronuclear metallocene catalyst compositions and their polymer products

Catalyst compositions comprising a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound are provided. An improved method for preparing cyclopentadienyl complexes used to produce polyolefins is also provided.

Polymerization process for producing bimodal polymers

This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging &#x3b7;-cyclopentadienyl-type ligands, in combination with at least one second Group 4 metallocene with non-bridging &#x3b7;-cyclopentadienyl-type ligands, typically in combination with at least one cocatalyst, and at least one activator. The compositions and methods disclosed herein provide ethylene polymers with a bimodal molecular weight distribution.

Dual metallocene catalysts for polymerization of bimodal polymers

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Helsinki, Finland

Kumudini Jayaratne