Boron-bridged bis-indenyl metallocene catalyst systems and polymers produced therefrom

摘要

Disclosed herein are catalyst compositions containing boron bridged, bis-indenyl metallocene compounds with an alkenyl substituent. These catalyst compositions can be used for the polymerization of olefins. For example, ethylene copolymers produced using these catalyst compositions can be characterized by a density less than 0.92 g/cm3 and a melt index greater than 25 g/10 min.

主权项

1. A catalyst composition comprising a metallocene compound, an activator, and an optional co-catalyst, wherein the metallocene compound has the formula:wherein:
M is Ti, Zr, or Hf; each X independently is a monoanionic ligand; InA is an indenyl group with an alkenyl substituent; InB is an indenyl group; and each R independently is H, a C1 to C36 hydrocarbyl group, or a C1 to C36 hydrocarbylsilyl group.