Patent ID: 7250478
Filing Date: 2007-07-31
Classification: C07F,C08F,Y10S

Abstract:
1. A metallocene catalyst component for producing polyolefins according to formula (I): or according to formula (II): wherein: each Cp is a substituted or unsubstituted cyclopentadienyl ring with a bridge-head position of at least one of the cyclopentadienyl rings being occupied by a silicon atom; each R is the same or different and is hydrogen or a hydrocarbyl radical containing from 1 to 20 carbon atoms or two carbon atoms are joined together to form a C R″ is a structural bridge between two Cp rings or between a Cp ring and a heteroatom ligand X; M is a group IIIB, IVB, VB or VIB metal from the Periodic Table of Elements; Q is a hydrocarbyl radical having from 1 to 20 carbon atoms, a hydrocarboxy radical having from 1 to 20 carbon atoms or a halogen and can be the same or different from each other; n is an integer from 0 to 4; g is 1 or 2; and X is a heteroatom ligand with one or two lone pair electrons and selected from the elements in group VA or VIA from the Periodic Table of Elements.