Basell Polyolefine Gmbh

Equistar Chemicals, LP

Lenka Lukesova

Shahram Mihan

Sandor M Nagy

Ilya Nifant'ev

Pavel V Ivchenko

Reynald Chevalier

Linda N Winslow

Gerhardus Meier

Dieter Lilge

Michael W Lynch

Iakovos Vittorias

Gerd Mannebach

Eleonora Ciaccia

Karen L Neal-Hawkins

Lars Kölling

Maclovio Herrera Salinas

Katrin Schuhen

Maclovio Herrara Salinas

A novel UHMW polyethylene material, which is displaying excellent abrasion resistance amongst other properties, is devised.

Ultra-high molecular weight polyethylene

New ethylene polymers having broad molecular weight distribution and long-chain branching, above all at high molecular weight fractions; the polymers have strain hardening equal or higher than 1.4 (at constant elongational rate of 0.5 s, at 150&#xb0; C.), branching index g' equal or lower than 0.9 (at Mw of 2&#xb7;10g/mol). The polymers are prepared by using a mixed catalyst system comprising a polymerization catalyst based on a late transition metal component having a tridentate ligand, and a Ziegler polymerization catalyst annealed at a temperature higher than 100&#xb0; C., for a time of at least 10 minutes.

Process for the polymerization of ethylene, and ethylene polymers having broad molecular weight distribution and long-chain branching

Process for the preparation of an ethylene copolymer composition having a polydispersity index M/Mof from 3 to 100, comprising a) feeding ethylene to at least one polymerization reactor; b) performing in the at least one polymerization reactor an oligomerization of ethylene in the presence of an oligomerization catalyst component (C) to produce comonomer; c) performing simultaneously in the at least one polymerization reactor polymerization reactions in the presence of catalyst components (A) and (B) producing, respectively, a first and a second polyethylene fraction, wherein the weight average molecular weight Mof the first polyethylene fraction produced by catalyst component (A) is less than the Mof the second polyethylene fraction produced by catalyst component (B) and the comonomer incorporation ability of catalyst component (B) is higher than the comonomer incorporation ability of catalyst component (A); and d) withdrawing the ethylene copolymer composition from the polymerization reactor.

Process for the preparation of ethylene copolymer compositions in the presence of an oligomerization catalyst

Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 metal complex that incorporates a dianionic, tridentate 2-(2-aryloxy)quinoline or 2-(2-aryloxy)dihydroquinoline ligand. In one aspect, supported catalysts are prepared by first combining a boron compound having Lewis acidity with excess alumoxane to produce an activator mixture, followed by combining the activator mixture with a support and the tridentate, dianionic Group 4 metal complex. The catalysts are easy to synthesize, support, and activate, and they enable facile production of high-molecular-weight polyolefins.

Catalysts based on 2-(2-aryloxy)quinoline or 2-(2-aryloxy)dihydroquinoline ligands

A method of preparing supported catalysts useful for olefin polymerization is described. The catalysts comprise a Group 4 metal complex that incorporates a tridentate dianionic ligand. An activator mixture is first made from a boron compound having Lewis acidity and an excess of an alumoxane. The activator mixture is then combined with a support and the Group 4 metal complex to give a supported catalyst. The method provides an active, supported catalyst capable of making high-molecular-weight polyolefins.

Method for preparing non-metallocene catalysts

Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 metal complex that incorporates a dianionic, tridentate 2-aryl-8-anilinoquinoline ligand. In one aspect, supported catalysts are prepared by first combining a boron compound having Lewis acidity with excess alumoxane to produce an activator mixture, followed by combining the activator mixture with a support and the tridentate, dianionic Group 4 metal complex. The catalysts are easy to synthesize, support, and activate, and they enable facile production of high-molecular-weight polyolefins.

Catalysts based on 2-aryl-8-anilinoquinoline ligands

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Frankfurt-am-Main, Germany

Lenka Lukesova