Patent ID: 6018064
Filing Date: 2000-01-25
Classification: C07F,C08F,Y10S

Abstract:
A metallocene compound having a formula I: ##STR9## wherein: Y is halogenM is a transition metal of group 3, 4, 5 or 6 of the periodic table;each L is independently selected from the group consisting of cyclopentadienyl-type groups, including indenyl and fluorenyl, wherein the cyclopentadienyl-type groups are optionally substituted with a substituent or substituents wherein the substituents are equal or different, wherein the L is united to M through a .pi. bond;Z is a group that forms a union bridge between the two L's, wherein Z can have between 0 and 20 carbon atoms and between 0 and 5 oxygen, sulphur, nitrogen, phosphorus, silicon, germanium, tin, or boron atoms;E is a spacer group that unites Z and Y and can have between 0 and 20 carbon atoms and between 0 and 5 oxygen, sulphur, nitrogen, phosphorus, silicon, germanium, tin, or boron atoms, wherein the E has a skeleton with at least one silicon, germanium, or tin atom, and wherein the 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 than 2 and coinciding with the oxidation state of the transition metal;j is a number of value 0 or 1 ; when j is equal to 1 and o is equal to 0, z has at least one silicon, germanium or tin atom, wherein Y is directly united with the silicon, germanium, or tin atom of Z;with a proviso that the compound does not have a general formula of: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 selected from the group consisting of hydrogen, halogen, and 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 L' coordinates to M.sup.1 ; each M.sup.2 is independently selected from the group consisting of silicon, germanium, and 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 R.sup.2 coordinates to M.sup.1 ; each A' is independently a divalent C.sub.1 -C.sub.40 carbon-containing rest; each z' is independently selected from the group consisting of boron, silicon, germanium, and tin; each R.sup.3 is independently selected from the group consisting of hydrogen and a C.sub.1 -C.sub.20 carbon-containing rest; o' is equal to 0, 1, or 2; each Hal is independently selected from the group consisting of halogen atoms; and p' is equal to 1, 2, or 3.