Catalyst

A metallocene complex represented by formula (I): each X is a sigma-ligand; in the R2Si-group, at least one R is methyl or ethyl and the other R is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl or isobutyl, pentyl, hexyl, cyclohexyl and phenyl; each R1 is independently the same or may be different and is a CH2-R7 group, wherein R7 is H or a linear or branched C1-6 alkyl group, C3-8 cycloalkyl group, or C6-10 aryl group; each R2 is independently a-CH =,-CY =,-CH2-,-CHY-or-CY2-group wherein Y is a C1-6 hydrocarbyl group and wherein n is from 2 to 6; each R3 and R4 are independently the same or may be different and are hydrogen, a linear or branched C1-6 alkyl group, a C7-20 aralkyl group, a C7-20 alkylaryl group, a C6-20 aryl group or a-OY group, wherein Y is a C1-6 hydrocarbyl group; r5 is a straight chain or branched chain C1-6 alkyl group, a C7-20 aralkyl group, a C7-20 alkylaryl group or a C6-20 aryl group; and R6 is a C (R8) 3 group, R8 is a linear or branched C1-6 alkyl