Patent ID: 6268448
Filing Date: 2001-07-31
Classification: C08F,Y10S

Abstract:
A process for the polymerization of one or more olefins in the presence of a catalyst precursor having an empirical structure of the formula: ##STR10##wherein A is selected from a phosphorus atom and an arsenic atom; each B is independently selected from the group consisting of an oxygen atom and a radical of the formula NR.sup.2, wherein each R.sup.2 is independently selected from the group consisting of a hydrogen atom, a C.sub.1-10 alkyl radical which is unsubstituted or up to fully substituted by one or more halogen atoms, a C.sub.6-10 aryl radical which is unsubstituted or up to fully subsituted by one or more halogen atoms, and trialkyl silyl radicals of the formula --Si(R.sup.5).sub.3 wherein each R.sup.5 is independently selected from the group consisting of a hydrogen atom and a C.sub.1-4 alkyl radical; each R.sup.1 is independently selected from the group consisitng of a hydrogen atom, a C.sub.1-10 alkyl radical which is unsubstituted or up to fully substituted by one or more halogen atoms, and a C.sub.6-10 aryl radical which is unsubstituted or up to fully subsituted by one or more halogen atoms; R.sup.3 and R.sup.4 are independently selected from the group consisting of a hydrogen atom, a halogen atom, a C.sub.1-8 alkyl radical, and a C.sub.6-10 aryl radical; M is a transition metal selected from the group consisiting of Ti, Zr, Hf and V; n is 1 or 2; m is 0 or 1 provided that the sum of n+m=2 and Cp is C.sub.5-13 ligand containing a 5-member carbon ring having delocalized bonding within the ring and typically being bound to the transition metal M through covalent 5 bonds which is unsubstituted or up to fully substituted by one or more substituents selected from the group consisting of a halogen atom, a C.sub.1-4 alkyl radical, and an amido radical which is unsubstituted or substituted by up to two C.sub.1-4 alkyl radicals; and an activator.