Patent ID: 6278009
Filing Date: 2001-08-21
Classification: C08F

Abstract:
A catalyst system comprising a metallocene compound in combination with a cocatalyst, wherein the metallocene compound has a formula (I): ##STR12##wherein:Y is halogen;M is a transition metal of group 3, 4, 5, or 6 of the periodic table;each L is independently a cyclopentadienyl-type unity, wherein the cyclopentadienyl-type unity is optionally substituted with substituents, wherein the substituents are equal or different, and wherein each L is united to M through a .pi. bond;Z is a group that forms a union bridge between the two unities L, wherein Z has 0 to 20 carbon atoms and 0 to 5 oxygen, sulfur, nitrogen, phosphorus, silicon, germanium, tin or boron atoms;E is a group having 0 to 20 carbon atoms and 0 to 5 oxygen, sulfur, nitrogen, phosphorus, silicon, germanium, tin or boron atoms, wherein E has a skeleton, and wherein the skeleton has at least one silicon, germanium or tin atom, and wherein Y is united with the silicon, germanium, or tin atom of E;o is a number of value 0 or 1;k is a number of value 1, 2, or 3;m is a number equal to or higher that 2 and coinciding with an oxidation state of the transition metal;j is a number of value 0 or 1;wherein when j is 1 and o is 0 , Z has at least one silicon, germanium or tin atom which Y is directly united to;wherein each ##STR13##group is the same or different, and wherein j is equal to 1 in at least one ##STR14##group;provided that the metallocene compound does not have general formula:X.sub.m, M.sup.1 (L'-M.sup.2 (R.sup.1 R.sup.2)--A'--Z'R.sup.3.sub.o,Hal.sub.p, ).sub.n',wherein M.sup.1 is a metal of group 4, 5, or 6 of the periodic table, each x is independently hydrogen, halogen or a C.sub.1 -C.sub.40 carbon-containing rest; m' is equal to 1, 2 or 3; n' is equal to 1 or 2; each L' is independently a pi ligand, wherein each L' coordinates to central atom M.sup.1 ; each M.sup.2 is independently silicon, germanium or tin; R.sup.1 is a C.sub.1 -C.sub.20 carbon-containing group; R.sup.2 is a C.sub.1 -C.sub.20 carbon-containing group or a pi ligand, wherein each R.sup.2 coordinates to central atom M.sup.1 ; each A' is independently a divalent C.sub.1 -C.sub.0 carbon-containing rest; each Z' is independently boron, silicon, germanium or tin; each R.sup.3 is independently hydrogen or a C.sub.1 -C.sub.20 carbon-containing rest; o' is equal to 0, 1 or 2; each Hal is independently a halogen atom; and p' is equal to 1, 2 or 3.