Abstract: A catalyst system in which the ratio of rac isomer to meso isomer of the metallocene is from 1:10 to 2:1 can be used for the polymerization of olefins.
Type:
Grant
Filed:
August 16, 2000
Date of Patent:
February 26, 2002
Assignee:
Tagor GmbH
Inventors:
Markus Göres, Carsten Bingel, Cornelia Fritze
Abstract: a) from 50 to 85% by weight of a copolymer of propylene (A) with 1-alkenes comprising from 20 to 80% by weight of a high molecular weight copolymer of propylene (I) containing from 2.0 to 7.0% by weight of copolymerized 1-alkene and having a viscosity of from 500 to 1200 ml/g and from 20 to 80% by weight of a low molecular weight copolymer of propylene (II) containing from 4.0 to 10.0% by weight of copolymerized 1-alkene and having a viscosity of from 200 to 450 ml/g,
b) from 5 to 10% by weight of a polymer of ethylene (B) and
c) from 10 to 40% by weight of a rubber-like copolymer of propylene and a 1-alkene (C) containing from 30 to 70% by weight of copolymerized 1-alkene
have a melt flow index (MFI) at 230° C. under a weight of 5 kg of from 0.1 to 5 g/10 min, a molecular weight distribution (Mw/Mn) of from 6 to 20 and a total 1-alkene content of from 4 to 15% by weight.