Patent ID: 6303718
Filing Date: 2001-10-16
Classification: C08F,Y10S

Abstract:
An aluminoxane-free catalyst system comprisinga) a fluorine-containing metal complex of formula (I)A.sub.a MF.sub.b L.sub.c (I)whereinM is a metal selected from the group consisting of zirconium, hafnium, vanadium, niobium and tantalum,A denotes an anionic ligand which is optionally singly- or multiply-bridged,F denotes a fluorine atom,L is a nonionic ligand,a is 1 or 2,b is 1, 2 or 3, andc is 0, 1, 2, 3 or 4,wherein a+b=3 or 4 if M is zirconium or hafnium; a+b=3, 4 or 5 if M=vanadium, niobium or tantalum, andb) a compound of formula (II)M'Y.sub.3 (II)whereinM' denotes boron or aluminum, andY denotes entities which are the same or different, and represents hydrogen, a linear or branched C.sub.1 to C.sub.20 alkyl group which is optionally substituted by silyl groups, a linear or branched C.sub.1 to C.sub.10 fluoroalkyl group, a C.sub.6 to C.sub.10 fluoroaryl group, a C.sub.1 to C.sub.10 alkoxy group, a C.sub.6 to C.sub.20 aryl group, a C.sub.6 to C.sub.20 aryloxy group, a C.sub.7 to C.sub.40 arylalkyl group, or a C.sub.7 to C.sub.40 alkylaryl group,wherein M'Y.sub.3 is not trimethylaluminum.