Abstract: A catalyst system having the following formula is described herein. wherein M is a metal; each X is an atom or group banded to M and may be the same or different; R1 and R2 may be the same or each may be different and are substituted or unsubstituted cyclopentadienyl or aromatic groups; RB is a structural bridge between R1 and R2 imparting stereorigidity thereto and including at least one heteroatom bonded to M, with each of R1 and R2 bonded to the same or different heteroatom of RB which heteroatom is also bonded to M; Z is the coordination number of M and is greater than or equal to 4 and m is the number of bonds between M and heteroatoms of RB.

Abstract: Bridged catalyst component in which a bridge spans two cylcopentadienyl or aromatic groups. The Cp or aromatic groups are attached to the same or different heteroatoms of the bridge, which heteroatoms are also bonded to a metal. A catalyst system can be made by contacting the bridged component with a cocatalyst. Polymerization of olefins can be catalyzed by the system.

Abstract: Bridged metallocene catalyst component in which a bridge spans two cyclopentadienyl groups, which Cp groups are attached to same or different heteroatoms of the bridge, which heteroatoms are also bonded to the metal. A catalyst systems is made by contacting the bridged component with a cocatalyst. Polymerization of olefins in catalyzed by the system.