Patent attributes
Catalyst compositions and methods useful in polymerization processes utilizing at least two metal compounds are disclosed. At least one of the metal compounds is a Group 15 containing metal compound and the other metal compound is preferably a bulky ligand metallocene-type catalyst. The invention also discloses a new polyolefin, generally polyethylene, particularly a multimodal polymer and more specifically, a bimodal polymer, and its use in various end-use applications such as film, molding and pipe. The Group 15 containing metal compound is represented in one embodiment by the formulae:wherein M is a Group 4, 5, or 6 metal;each X is independently a leaving group;y is 0 or 1;n is the oxidation state of M;m is the formal change of the ligand comprising the YZL or YZL′ groups;L is a Group 15 or 16 element;L′ is a Group 15 or 16 element or Group 14 containing group;Y is a Group 15 element;Z is a Group 15 element;and the other groups are as defined herein.
