Elf Atochem S.a.

Atofina

Atochem

Arkema Inc.

Total Petrochemicals France

Jean Malinge

Roger Spitz

Thierry Saudemont

Claude Brun

Jean-Loup Lacombe

Jean-Pierre Broyer

Nathalie Verdel

Jean-Michel Brusson

Daniel Cochard

Philippe Coutrot

Claude Grison

Corinne Meynard

Jean-Francois Joly

Valerie Barthel

Henri Violle

Delphine Batt-Coutrot

Francois Mathey

Laurent Duranel

Hajime Yasuda

Maryse Patin

Veronique Pasquet

Bernard Deschamps

Guillaume Desurmont

Francois-Xavier Buzin

Marie-Laure Bousque

Francois Nief

Jerome Dupuy

Eliane Deschamps

The invention relates to alkoxysilacycloalkanes, to the process of their preparation and to their use in the polymerization of olefins. The introduction of these alkoxysilacycloalkanes into the olefin polymerization environment makes it possible to raise the heptane-insolubles content of the polymer finally formed.

Alkoxysilacycloalkanes, process for their preparation and their use for the polymerization of olefins

The present invention relates to a catalytic component for the polymerization of olefins combining a number of catalytic components for the polymerization of olefins and to a process for preparing it. The catalytic component according to the invention is obtained by impregnation of a prepolymer with a solution of a catalytic component for the polymerization of olefins. The invention brings about control of the combination of different catalytic components and provides for improvement in the control of the quality of the polymers manufactured by virtue of the catalytic action of the combined catalytic components. Another advantage of the invention is to be able to control the morphology and the particle size distribution of the polymers by choosing the morphology of a single catalytic component. The prepolymer and the polymer obtained from the catalytic component according to the invention are also subjects of the present invention.

Catalytic component for the polymerization of olefins obtained by impregnation of a prepolymer with a solution of a catalytic component, prepolymer obtained from the catalytic component and polymerization process using said catalytic component

The invention relates to novel bridged biphosphole ligands according to the general formula:where R, R, Rare chosen from hydrogen, alkyl, aryl or silyl, Ris chosen from hydrogen, alkyl, aryl or halogen, Rpossibly being replaced with a direct bond between the two phosphorus atoms and T is a divalent group. The invention also relates to metallocenes obtained from these ligands. These metallocenes are useful as catalytic components for the polymerization of olefins.

Bridged biphospholes and metallocenes prepared therefrom

A process is provided for preparing a catalyst support for polymerizing &agr;-olefins comprising the steps of: (i) reacting, in the presence of a first electron donor, a chlorine-containing organic compound and a prior mixture of an alkylmagnesien and an aluminoxane and/or aluminosiloxane and/or alkylaluminum and, optionally, a second electron donor; and (ii) activating a product from step (i) in suspension in an inert liquid by means of an activation electron donor, together with the support thus obtained, a catalyst for polymerizing &agr;-olefins, comprising this catalyst support and a group IV transition metal halide, and a process for polymerizing &agr;-olefins, particularly propylene, comprising contacting the &agr;-olefin with the catalyst.

Process for preparing a catalyst support for polymerization of &agr;-olefins, and support thus obtained

Activator solid support for metallocene catalysts in the polymerization of olefins, a process for preparing such a support, and the corresponding catalytic system and polymerization process

The invention concerns a method for preparing block copolymers comprising steps which consist in: polymerising a first monomer using an organolanthanide catalyst wherein said catalyst in the form of a hydride complex of a trivalent metal from the group of rare earths; then in polymerising at least a second monomer. The invention also concerns block copolymers whereof the blocks are polyolefins.

Method for copolymerization and resulting copolymers

A copolymer of ethylene and an alpha-olefin contains from 3 to 12 carbon atoms, wherein 0.1 to 1.5 mol % of the units originate from the alpha-olefin. The copolymer has a relative density ranging from 0.960 to 0.940, a transition metal content lower than 6 ppm, an Mw/Mn ratio higher than 7, an Mz/Mw ratio higher than 3.3 and an Mz higher than 300,000. The copolymer is prepared from the polymerization or co-polymerization of at least one olefin in the presence of a solid catalytic component or a prepolymerized catalyst.

Olefin polymer or copolymer formed using a solid catalytic component

The present invention relates to a catalytic composition for the polymerization of olefins combining a number of catalytic components for the polymerization of olefins and to a process for preparing it. The catalytic component according to the invention is obtained by impregnation of a prepolymer with a solution of a catalytic component for the polymerization of olefins. The invention brings about control of the combination of different catalytic components and provides for improvement in the control of the quality of the polymers manufactured by virtue of the catalytic action of the combined catalytic components.

Catalytic component for the polymerization of olefins obtained by impregnation of a prepolymer with a solution of a catalytic component, and the prepolymer obtained from the catalytic component

Process for preparing a catalyst support for polymerization of alpha-olefins, and support thus obtained

Catalytic component and its use in olefin polymerization

Activator solid support for metallocenes as catalysts in the polymerization of olefins, characterized in that it consists of a group of support particles for a solid catalytic component, which are formed from at least one porous mineral oxide, the said particles having been modified in order to carry, on the surface, aluminium and/or magnesium Lewis-acid sites of formula:

The invention relates to a process for the preparation of a solid catalytic component of metallocene type for the polymerization of olefins comprising a stage of reaction between a support and a derivative of formula R.sup.1 M.sup.1 X.sup.1.sub.3, in which R.sup.1 represents a hydrocarbon radical, M.sup.1 represents a silicon, germanium or tin atom and X.sup.1 represents a halogen atom. The solid catalytic component according to the invention exhibits a high activity in the polymerization or copolymerization of olefins and can lead to polymers or copolymers of high molecular mass and of low polydispersity, for example less than 2.5.

Solid catalytic component for the polymerization of olefins

The present invention relates to a prepolymer for the polymerization of olefins, the said prepolymer achieving a combination of a number of solid catalytic components for the polymerization of olefins. The combination of catalytic components makes it possible to combine two properties within the same polymer, one of the properties being contributed by one of the catalytic components and the other property being contributed by the other catalytic component.

Prepolymer for the polymerization of olefins combining a number of solid

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Loubieng, France

Jean Malinge