Patent ID: 7342078
Filing Date: 2008-03-11
Classification: C07F,C08F,Y10S

Abstract:
1. A metallocene of the formula (I) where M is a metal of group IVb of the Periodic Table of the Elements, R are identical or different and are each a hydrogen atom, a C R are identical or different and are each a hydrogen atom or a hydrocarbon group which may be halogenated, linear, cyclic or branched, R is a hydrocarbon group which is unbranched in the α position and may be halogenated, R is a hydrocarbon group which is cyclized in the α position or branched in the α position and may be halogenated, R are identical or different and are each a C R is a bridge where R can be identical or different, even when they have the same index, and are each a hydrogen atom, a halogen atom or a C x is an integer from zero to 18, M is silicon, germanium or tin, and R R is a C R is hydrogen or is as defined for R R are each C