Basf Aktiengesellschaft

Centre National De La Recherche Scientifique

Bp Chemicals Limited

Signa Chemistry, Inc.

Ecp-enichem Polymeres France S.a.

Laboratoire De Chimie Des Polymeres Organiques

Laboratoire De Chimie Des Polymeres Organiques, Enscpb-cnrs

Alain Deffieux

Christian Schade

Philippe Desbois

Michel Fontanille

Volker Warzelhan

Wolfgang Fischer

Hermann Gausepohl

Konrad Knoll

Henri Cramail

Stephane Menoret

Michael Lefenfeld

Sergio Mastroianni

Karel Bujadoux

Wolfgang Loth

Michael Ishaque

Eric Cloutet

Jürgen Demeter

Daniel Taton

Stephan J&uuml;ngling

Rainer Klostermann

Stéphane Carlotti

Emmanuel Adisson

Stefan L&auml;tsch

Mana Ito

Cedric Dever

Cécile Bouilhac

Stephane Carlotti

The present invention relates to a catalyst system, to a method of manufacturing this system, and also to uses of this system. The catalyst system of the invention is characterized in that it comprises molecules of a polymer having, at one of its ends or along the chain, one or more polar functional groups; a solvent, said solvent, due to the fact of said polar functional group of said polymer, provoking and maintaining, when said molecules of the polymer are introduced thereinto, an organization of said molecules of the polymer into aggregates, micelles or vesicles so that the polar functional groups of said polymer are located inside the aggregates, micelles or vesicles formed; and a catalyst activator and a catalyst trapped in said aggregates, micelles or vesicles of said polymer. The catalyst system of the present invention may be used, for example, for catalyzing a (co)polymerization of olefins.

Catalyst system, method of manufacture and use

Stage I Group 1 metal/porous metal oxide compositions or Stage II Group 1 metal/porous metal oxide compositions are shown to be useful to remove impurities and act as drying agents for various types of solvents and for olefinic monomers used in anionic polymerizations. One important advantage of these compositions is their ability to dry simultaneously solvent and monomers, without inducing a significant polymerization of the latter. Another important characteristic is the capacity of the compositions to be totally inactive toward conventional anionic polymerization which allows them to be left in situ during the polymerization itself.

Use of alkali metal-silica gel (M-SG) materials in solvent and monomer drying and purification for their use in anionic polymerization

A process for the preparation of a silicon containing transition metal compound that includes the steps of (a) non-hydrolytic sol-gel condensation of a silane of formula LSiQwherein L is a &#x3c3;-bonded ligand, Q is an anionic ligand, and x+n=4 with a halogenated silane (or siloxane) and an alkoxysilane, (b) optionally alkylation, (c) deprotonation and (d) addition of a transition metal compound. The process allows for the preparation of transition metal compounds which may suitably be used with cocatalysts for the polymerization of olefins, in particular for such processes carried out in the gas phase.

Silica-supported polymerization catalyst

The invention relates to an initiator composition for anionic polymerization, comprising at least one alkali metal hydride selected from LiH, NaH, and KH, and at least one organylaluminum compound, and to a process for the anionic polymerization of styrene monomers or of diene monomers using the initiator composition.

Initiator composition and method for anionic polymerisation

Process for preparing homopolymers of &#x3b1;-methylstyrene, or copolymers of &#x3b1;-methylstyrene and comonomers, by anionic polymerization in the presence of an initiator composition, which comprises using an initiator composition in which potassium hydride and at least one organylaluminum compound are present.

Method for anionic polymerization of &#x3b1;-methylstyrene

In a process for the anionic polymerization of vinylaromatic monomers or dienes in the presence of a lithium organyl or lithium alcoholate and a magnesium and/or an aluminum compound, a sterically hindered phenol or amine is added.

Method for carrying out the anionic polymerization of vinylaromatic monomers

Anionic polymerization process

In a process for the homopolymerization of vinylaromatic monomers or the copolymerization of vinylaromatic monomers and dienes, the monomers are polymerized in the presence of at least one alkali metal organyl, at least one magnesium organyl and at least one aluminum organyl. The invention also provides an initiator composition for carrying out the process.

Method for retarded anionic polymerization

Disclosed are a process for the preparation of an initiator composition comprising an alkali metal organyl and an aluminum organyl and a process for the polymerization of anionically polymerizable monomers.

Method for the production of an initiator composition for retarded anionic polymerization

This catalyst has the general formula VX.sub.3, mAIX.sub.3, nZ, wherein X is a halogen atom, Z is at least one at least partially halogenated, branched or unbranched, saturated hydrocarbon, m is between 0.1 and 10, and n is between 1 and 300. To prepare it, a vanadium halide VX.sub.2 and/or VX.sub.3 is coground with an aluminum halide AlX.sub.3, and then at least one halogenated hydrocarbon Z is added to the mixture obtained in proportions corresponding to the chosen values of m and n. The invention also relates to the (co)polymerization of alpha-olefins at 20.degree.-350.degree. C. in the presence of a catalyst system comprising at least one catalyst as defined above and at least one organometallic activator.

Catalyst for the (co)polymerization of alpha-olefins, a process for its

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Bordeaux, France

Alain Deffieux