Solvay Polyolefins Europe-belgium (societe Anonyme)

Solvay Polyolefins Europe-belgium

Solvay (societe Anonyme)

Solvay Deutschland Gmbh

Philippe Francois

Jean-Louis Costa

Dirk Vercammen

Vincent Laurent

Serge Bettonville

Dominique Marchand

Helmut Derleth

Fabian Siberdt

Karl-Heinz Bretz

Heinz-Helmer Rasche

Federica Martina Benvenuti

St&eacute;phane Paye

Catalytic complexes and their use for polymerizing alpha-olefins

Catalyst support containing an &agr;-olefin polymer which is in the form of particles of mean size from 5 to 350 &mgr;m in which the pore volume generated by the pores of radius from 1,000 to 75,000 &angst; is at least 0.2 cm /g. Catalyst usable for the polymerization of &agr;-olefins, including a compound containing at least one transition metal belonging to groups IIIb, IVb, IVb and VIb of the Periodic Table, bound in or on this support.

Catalyst support and catalyst for the polymerization of &agr;-olefins

Process for polymerizing alpha-olefins

Process for the preparation of a catalyst for the polymerization of alpha-olefins involves contacting a porous polyolefin support with a solution containing an activator (ii) to form a suspension. The suspension is evaporated in a reactor fitted with a stirrer comprising a scraping element. The scraping element follows the walls of the reactor at a distance from 2 to 200 times the mean particle diameter of the support. The catalyst includes a compound of a transition metal (i) from Groups 4 to 6 of the Periodic Table and at least one optionally substituted cyclopentadiene ligand and an aluminoxane activator (ii). The aluminoxane activator (ii) and transition metal compound are supported on the porous polyethylene support (iii). The walls of the reactor show no traces of crusting.

Process for the preparation of a catalyst for the polymerization of alpha-olefins, catalyst obtained and polymerization process using such a catalyst

Disclosed is for the preparation of a catalytic composition for the polymerization of alpha-olefins. The catalyst comprises a compound of a transition metal (i) of Groups 4 to 6 of the Periodic Table, containing at least one possibly substituted cyclopentadiene ligand, and an activator (ii) chosen from aluminoxanes and ionizing agents supported on a support (iii) consisting of porous particles of polyolefin(s). Preparation includes a preliminary polymerization which includes contact with an alpha-olefin, under polymerizing conditions, in a diluent whose kinematic viscosity, measured at 20&deg; C., is from 3 to 3000 cSt (centistokes) from 3 to 3000 mm /s, such as mineral oil which may be derived from coal tars and petroleum fractions, to form from 0.01 to 50 g of polyolefin per g of catalyst containing compounds (i), (ii) and (iii).

Process for the preparation of a catalytic composition for the polymerization of alpha-olefins, catalytic composition obtained and polymerization process using such a catalytic composition

A process for producing porous polymer beads in which polymers, preferably polyolefins or polyvinyl chloride, are dissolved in a solvent, preferably halogenated hydrocarbons or alkyl esters, at temperatures close to the boiling point of the solvent. The hot polymer solution is cooled, and the polymer beads formed during the cooling process are separated, washed and dried. The porous polymer beads are useful, for example, as catalyst carriers or as adsorption agents.

Process for producing porous polymer globules

The invention comprises a catalyst support containing an &agr;-olefin polymer which is in the form of particles of mean size from 5 to 350 &mgr;m in which the pore volume generated by the pores of radius from 1,000 to 75,000 &angst; is at least 0.2 cm,/g. A catalyst usable for the polymerization of &agr;-olefins, including a compound containing at least one transition metal belonging to groups IIIb, IVb, IVb and VIb of the Periodic Table, bound in or on this support, is also described.

Catalyst support containing an .alpha.-olefin polymer which is in the form of particles of mean size from 5 to 350 .mu.m in which the pore volume generated by the pores of radius from 1,000 to 75,000 .ANG. is at least 0.2 cm.sup.3 /g. Catalyst usable for the polymerization of .alpha.-olefins, including a compound containing at least one transition metal belonging to groups IIIb, IVb, IVb and VIb of the Periodic Table, bound in or on this support.

Catalyst support and catalyst for the polymerization of .alpha.-olefins;

Catalyst support and catalyst for the polymerization of alpha-olefins;

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Court-Saint-Etienne, Belgium

Philippe Francois