Bayer Aktiengesellschaft

Bayeraktiengesellschaft

Heike Windisch

Gerd Sylvester

Werner Obrecht

Norbert Steinhauser

Steffen Maiwald

Rudolf Taube

Gisbert Michels

Sigurd Becke

Thomas Scholl

Oskar Nuyken

Michael Mager

J&uuml;rgen Trimbach

Peter Schertl

Uwe Denninger

R&uuml;diger Engehausen

Ellen Giebeler

Cristina Stere

Mario Vierle

Lars Friebe

Steffen Kahlert

Joachim Scholz

J&uuml;rgen Giesemann

Jurgen Giesemann

Thomas Rosenstock

Thomas Ruhmer

The block copolymers according to the invention which are based on conjugated diolefins and polar monomers and are prepared in the presence of catalysts based on the rare earth metals have a high cis-1,4 content in the polydiene block and, because of their polar polymer part and their non-polar diene polymer part, can be used as agents which impart compatibility in the preparation of vulcanizates with a filler content for the production of tires and tire component in the preparation of thermoplastic elastomers or in the modification of thermoplastics.

Block copolymer based on conjugated diolefins and polar monomers

The present invention relates to a process for the copolymerization of conjugated diolefins with non-conjugated olefins in the presence of rare earth metal catalysts. The advantages of the process according to the invention are in particular the high selectivity, good space-time yield and the possibility of being able to vary the reaction conditions within a wide range.

Copolymerization of conjugated dienes with non-conjugated olefins by means of rare earth catalysts

The present invention relates to a novel dendrimic compounds, to a method for the production thereof and to the use thereof as catalysts for the production of polymers, in particular to the use thereof as co-catalysts for metallocenes for polymerizing unsaturated compounds.

Dendrimer compounds, method for the production thereof, use thereof as catalysts

Conjugated diolefins, optionally in combination with other unsaturated compounds which may be copolymerized with the diolefins, are polymerized by performing the polymerization of the diolefins in the presence of catalysts based on monocyclopentadienyl compounds of vanadium and alumoxanes in the presence of aromatic vinyl compounds as the solvent at temperatures of &minus;30 C. to &plus;80 C. By means of the process according to the invention, it is possible to straightforwardly produce solutions of polydiolefins, such as polybutadiene, having 1,2 unit contents of 10 to 30% in aromatic vinyl compounds, which solutions may then, for example, be further processed to yield ABS or HIPS.

Method for polymerizing conjugated diolefins (dienes) with catalysts based on vanadium compounds in the presence of vinylaromatic solvents

The present invention concerns a method for the copolymerization of conjugated diolefins and vinyl-aromatic monomers in the presence of rare-earth catalysts and the use of the copolymers in rubber mixtures for tire applications.

Method for the copolymerization of conjugated diolefins (dienes) and vinyl-aromatic monomers with rare-earth catalysts and use of the copolymers in rubber mixtures for tire applications

The invention relates to new catalysts based on compounds of the rare earth metals containing a compound of the rare earth metals, a cyclopentadiene, and an alumoxane, as well as the use of new catalysts for the polymerisation of unsaturated compounds, particularly conjugated dienes. With the new catalyst system it is possible in the polymerisation of conjugated dienes to obtain a substantially higher proportion of laterally bound vinyl groups in the polymers.

Catalyst with a base consisting of compounds of the rare earth metals for polymerizing unsaturated organic compounds

Two-component supported catalysts and their use for gas-phase polymerization

Conjugated diolefins, optionally in combination with other unsaturated compounds which may be copolymerized with the diolefins, are polymerized by performing the polymerization of the diolefins in the presence of catalysts based on cobalt compounds, organoaluminum compounds and modifiers in the presence of aromatic vinyl compounds at temperatures of &minus;30&deg; C. to &plus;80&deg; C. By means of the process according to the invention, it is possible straightforwardly to produce solutions of polydiolefins, such as polybutadiene, having different 1,2 unit contents in aromatic vinyl compounds, which solutions may then, for example, be further processed to yield ABS or HIPS.

Method for polymerizing conjugated diolefins (dienes) with catalysts based on cobalt compounds in the presence of vinylaromatic solvents

Compounds of the rare earths and their use as polymerization catalysts for unsaturated compounds

The present invention relates to a supported cobalt catalyst consisting of

Supported cobalt catalyst, production thereof and use thereof for the

The present invention relates to a catalyst system based on monoazadiene metal complexes of the formula ##STR1## and a co-catalyst suitable for activating the metal complex, and to the use of the catalyst system for the polymerization of unsaturated compounds, especially for the polymerization and copolymerization of olefins and/or dienes. The novel catalyst system is characterised in particular by its ease of access, its lack of sensitivity to external influences and its ease of handling.

Catalyst system based on monoazadiene metal complexes

Gas-phase polymerisation of conjugated dienes in the presence of rare

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Leverkusen, Germany

Heike Windisch