Hoechst Aktiengesellschaft

Targor Gmbh

Basell Polyolefine Gmbh

Hoechst Gmbh

Tangor Gmbh

Clarian & Gmbh

Walter Spaleck

Andreas Winter

Volker Dolle

Martin Antberg

Jurgen Rohrmann

Bernd Bachmann

Frank Kuber

Michael Aulbach

Hans-Friedrich Herrmann

J&uuml;rgen Rohrmann

Wolfgang Anton Herrmann

Christian Kohlpaintner

Herbert Riepl

Robert Klein

Juergen Rohrmann

Frank K Uber

Thomas Dries

Ludwig Bohm

Frank K&uuml;ber

Jürgen Rohrmann

Klaus K Uhlein

Gunter Schloegl

Gerd Hohner

Klaus Kuhlein

Cornelia Fritze

Frank Kueber

Roland Zenk

Hartmut Voigt

Michael-Joachim Brekner

Michael Schreck

Hartmut Luker

J Urgen Rohrmann

Reiner Hess

Hartmut Kondoch

Bernhard Hierholzer

Frank Küber

The novel metallocenes of the formula Iin which, preferably, Mis Zr or Hf, Rand Rare alkyl or halogen, Rand Rare hydrogen, Rand Rare alkyl or haloalkyl, &#x2014;(CRR)&#x2014;R&#x2014;(CRR)&#x2014; is a single- or multi-membered chain in which Rmay also be a (substituted) hetero atom, m+n is zero or 1, and Ris hydrogen, form, together with aluminoxanes as cocatalysts, a very effective catalyst system for the preparation of polyolefins of high stereospecificity and high melting point.

Metallocenes containing ligands of 2-substituted indenyl derivatives, process for their preparation, and their use as catalysts

A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R&#x2014;CH&#x2550;CH&#x2014;R, in which Rand Rare identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms or Rand R, together with the atoms connecting them, can form a ring, at a temperature of from &#x2212;60&#xb0; to 200&#xb0; C., at a pressure of from 0.5 to 100 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst formed from a metallocene in the meso-form or a meso:rac mixture, with meso:rac&#x3e;1:99, as transition-metal compound and a cocatalyst, wherein the metallocene is a compound of the formula I,in which Mis Zr or Hf, Rand Rare identical or different and are methyl or chlorine, Rand Rare identical or different and are methyl, isopropyl, phenyl, ethyl or trifluoromethyl, Rand Rare hydrogen or as defined for Rand R, or Rforms an aliphatic or aromatic ring with R, or adjacent radicals Rform a ring of this type, and Ris aradical, and m plus n is zero or 1.

Process for the preparation of polyolefins

Metallocene capable of being used for the process for the preparation of a syndiotactic polyolefin

The disclosed heat-sealable, layered film comprises a polyolefinic base layer and at least one outer layer. The outer layer comprises a propylene-olefin copolymer prepared by means of a metallocene catalyst. The film is prepared by coextruding melts corresponding to the individual layers of the film, taking off the coextruded film over a take-off roll whose temperature is between 10 and 90&deg; C., biaxially stretching and then heat-setting the resulting film, and optionally corona- or flame-treating the film, then winding it up in a wind-up unit.

Heat-sealable, polyolefinic multilayer film, process for the production thereof, and the use thereof

Process for the preparation of a polyolefin

2-substituted disindenylmetallocenes, process for their preparation, and their use as catalysts in the polymerization of olefins

A very effective catalyst system for the polymerization or copolymerization of olefins comprises a cocatalyst, preferably an aluminoxane or a supported aluminoxane, and a metallocene of the formula I

Metallocenes containing aryl-substituted indenyl derivatives as ligands, process for their preparation, and their use as catalysts

Metallocenes containing aryl-substituted indenyl ligands and their use as catalysts

Polyolefins prepared with metallocene catalysts having 2-substituted indenyl type ligands

In the case of Ziegler catalysts based on a metallocene as the transition metal component and an aluminoxane as the activator, preactivation of the metallocene with the aluminoxane results in a considerable increase in the activity of the catalyst system. Furthermore, 1-olefin polymers of a high degree of isotacticity and having compact, spherical particles, a very narrow particle size distribution and a high bulk density are obtained by means of a catalyst system of this type.

Process for the preparation of 1-olefin polymers

Polyolefins with a molecular weight distribution M.sub.w /M.sub.n .gtoreq.3.0, which may be monomodal, bimodal or multimodal, can be obtained by polymerization or copolymerization of olefins with a catalyst system consisting of an aluminoxane and a transition metal component (metallocene), in which the transition metal component consists of at least one zirconocene of the formula I and at least one zirconocene of the formula Ia ##STR1## or alternatively of at least 2 zirconocenes of the formula I.

Metallocene compound and its use as catalyst component The present invention relates to a multinuclear metallocene compound of the formula I, ##STR1## where M.sup.1 is a tetravalent metal, L.sup.1 are, independently of one another, identical or different and are each a substituted cyclopentadienyl group, L.sup.2 and L.sup.3 are, independently of one another, identical or different and are each a .pi. ligand, B are, independently of one another, identical or different and are each a divalent bridging unit, X are, independently of one another, identical or different and are each a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.10 -fluorocarbon radical or a hydrocarbon-containing radical having 1-40 carbon atoms, and k is an integer from 0 to 10. The metallocene compound of the present invention is suitable as a catalyst component for preparing olefin polymers.

Metallocene compound and its use as catalyst component

Growing community of inventors

Liederbach, Germany

Walter Spaleck