Patent ID: 6262201
Filing Date: 2001-07-17
Classification: C07F,C08F,Y10S

Abstract:
An unbridged sandwich bonded metallocene selected from the unbridged bis metallocenes in which each ligand has the formulaCp-Si(R).sub.2 --(C--(R').sub.2).sub.n -Awherein Cp is selected from cyclopentadienyl, 3-methylcyclopentadienyl, and 1-indenyl, each R can be the same or different and is an alkyl radical having 1 to 6 carbon atoms, each R' can be the same or different and is selected from hydrogen and alkyl radicals having 1 to 6 carbon atom, A is an aryl radical, and n is 0 to 5 orCp-(C(R').sub.2).sub.n -Awherein Cp is selected from cyclopentadienyl, 3-methylcyclopentadienyl, 1 -indenyl, A is an aryl radical, n is 1 to 5, and R' is as defined above, except when Cp is cyclopentadienyl and A is phenyl then R' is not methylene, dimethyl methylene or 2-methyl ethylene which is connected such that the phenyl is also bonded to the 2 carbon of the 2-methyl ethylene, andunbridged sandwich bonded metallocenes in which the two cyclodienyl ligands differ and wherein one of the cyclodienyl ligands is selected from those having the formulaCp-Si(R).sub.2 --(C(R').sub.2).sub.n -Awherein Cp is selected from cyclopentadienyl, 3-methylcyclopentadienyl, and 1-indenyl, each R can be the same or different and is an alkyl radical having 1 to 6 carbon atoms, each R' can be the same or different and is selected from hydrogen and alkyl radicals having 1 to 6 carbon atom, A is a cyclic compound having conjugated unsaturation, and n is 0 to 5 orCp-(C(R').sub.2).sub.n -Awherein Cp is selected from cyclopentadienyl, 3-methylcyclopentadienyl, 1-indenyl, A is an aryl radical, each R' can be the same or different and is selected from hydrogen and alkyl radicals having 1 to 6 carbon atoms, and n is 1 to 5.