Basell Poliolefine Italia, S.p.a.

Basell Polypropylen Gmbh

Eduardo Chicote Carrion

Volker Dolle

Gianni Collina

Ofelia Fusco

Herbert Terwyen

Horst Klassen

Karl-Heinz Kagerbauer

Alberto Gil

Process for the polymerization of olefins CH&#x2550;CHR, in which R is hydrogen or a hydrocarbon radical with 1&#x2013;12 carbon atoms, carried out in the presence of a catalyst component (A) comprising Mg, Ti and halogen as essential elements and of a catalyst component (B) capable to produce, under the same polymerization conditions, a polymer with an average particle size lower than that obtainable with the said catalyst component A. The said process provides polymers with increased bulk density.

Process for the polymerization of olefins

The invention relates to a high-molecular-weight copolymer comprising ethylene and propylene units which has an ethylene content in the range from 1 to 10% by weight, a melt flow rate MFR (230/5) of <5 dg/min and a molecular-weight distribution M /M in the range from 6 to 20. The invention also relates to a process for the preparation of the copolymer in the presence of a catalyst, an organoaluminum compound (B) and an organosilicon compound (C), in which the polymerization is carried out in two reaction steps, where the suspension medium in the first step is simultaneously the monomer, and a polypropylene having a viscosity of from 500 to 1400 ml/g which makes up a proportion of from 20 to 80% of the total polymer is prepared in the first reaction step.

High-molecular-weight polypropylene having a broad molecular-weight distribution

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Bayreuth, Germany

Eduardo Chicote Carrion