Patent ID: 6300438
Filing Date: 2001-10-09
Classification: C08F

Abstract:
A process for polymerizing olefin(s) in the presence of a catalyst system comprising a Group 15 containing hafnium catalyst compound, wherein the process is conducted at a temperature from between 50.degree. C. to 200.degree. C., and wherein the Group 15 containing hafnium compound is represented by the formulae: ##STR5##whereinM is hafnium;each X is independently a leaving group;y is 0 or 1;n is the oxidation state of M;m is the formal charge of Y, Z and L or of Y, Z and L';L is a Group 15 element;L' is a Group 15 element or Group 14 containing group;Y is a Group 15 element;Z is a Group 15 element;R.sup.1 and R.sup.2 are independently a C.sub.1 to C.sub.20 hydrocarbon group, a heteroatom containing group having up to twenty carbon atoms, silicon, germanium, tin, lead, or phosphorus;R.sup.3 is absent, a hydrocarbon group, hydrogen, a halogen, or a heteroatom containing group;R.sup.4 and R.sup.5 are independently an alkyl group, an aryl group, a substituted aryl group, a cyclic alkyl group, a substituted cyclic alkyl group, a cyclic arylalkyl group, a substituted cyclic arylalkyl group or a multiple ring system;R.sup.1 and R.sup.2 may be interconnected to each other, and/or R.sup.4 and R.sup.5 may be interconnected to each other;R.sup.6 and R.sup.7 are independently absent, hydrogen, an alkyl group, halogen, heteroatom or a hydrocarbyl group; andR* is absent, hydrogen, a Group 14 atom containing group, a halogen, or a heteroatom containing group.