Patent ID: 7273913
Filing Date: 2007-09-25
Classification: C07F,C08F,Y10S

Abstract:
1. A process for the preparation of ethylene copolymers having a M w /M n ratio of at least about 3.7, wherein the process is carried out in the presence of meso- and rac-stereoisomeric mixtures of metallocene compounds having general formula (I): wherein M is selected from the group consisting of titanium, zirconium, and hafnium; X A′ and A″, the same or different, are a radical of the η wherein the groups R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , the same or different, are selected from the group consisting of hydrogen, a C 1 -C 8 aliphatic radical, a C 5 -C 12 cycloaliphatic radical, and a C 6 -C 14 aryl radical; the groups R 1 , R 2 , R 3 , R 4 , the same or different, are selected from the group consisting of hydrogen, a C 1 -C 8 aliphatic radical, a C 5 -C 12 cycloaliphatic radical, a C 6 -C 14 aryl radical, and halogen, wherein the stereoisomeric mixture has a content of meso-compound ranging from 20 to 80%, the complement to 100 consisting of rac-compound.