| abstract |
A metallocene catalyst complex of formula (I): **(See formula)** where Mt is Hf or Zr; each X is a sigma ligand, each R1 independently are the same or may be different and are a CH2-R7 group, where R7 is H or a straight or branched C1-6 alkyl group, C3-8 cycloalkyl group, C3-8 aryl group C6-10, each R2 is independently a -CH=, -CY=, -CH2-, -CHY- or -CY2- group, where Y is a C1-10 hydrocarbyl group and where n is 2-6, each R3 and R4 are independently the same or may be different and are hydrogen, a straight or branched C1-C6 alkyl group, an OY group, or a C7-20 arylalkyl group, C7-20 alkylaryl group, or C6-20 aryl group, whereby at least one R3 per phenyl group and at least one R4 is not hydrogen, and optionally, two adjacent R3 or R4 groups may form part of a ring that includes the phenyl carbons to which they are attached, R5 is a group straight or branched C1-C6 alkyl, C7-20 arylalkyl, C7-20 alkylaryl group or C6-C20 aryl group, R6 is a C(R8)3 group, where R8 is a linear C1-C6 alkyl group or branched, each R is independently a C1-C20 hydrocarbyl, C6-C20 aryl, C7-C20 arylalkyl, or C7-C20 alkylaryl. |