Elf Atochem S.a.

Atofina

Other

Arkema Inc.

Thierry Saudemont

Jean Malinge

Roger Spitz

Jean-Pierre Broyer

Nathalie Verdel

Claude Brun

Jean-Michel Brusson

Jean-Loup Lacombe

Philippe Coutrot

Daniel Cochard

Claude Grison

Corinne Meynard

Valerie Barthel

Delphine Batt-Coutrot

Atanas Tomov

Henri Violle

Xavier Francois Drujon

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

Method for polymerizing olefins in the presence of nickel complexes and corresponding catalytic system

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 polymerising at least one olefin in the presence of at least a catalyst comprising a sequence E&mdash;M&mdash;X wherein E represents an oxygen or sulphur atom; M represents a nickel or palladium or platinum atom; X represents a phosphorus, arsenic or antimony atom in a medium comprising a continuous liquid phase containing more than 30 wt. % of water. The method can result in a polymer latex of at least one olefin.

Method for polymerising olefins in the presence of water

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

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

Growing community of inventors

Jurancon, France

Thierry Saudemont