Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2005-05-17
2005-05-17
Bell, Mark L. (Department: 1755)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S114000, C526S116000, C526S117000, C526S118000, C526S119000, C526S161000, C526S171000, C526S943000
Reexamination Certificate
active
06894128
ABSTRACT:
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.
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Erickson Kersten Anne
Karol Frederick J.
Kwack Tae Hoon
Loveday Donald R.
Mawson Simon
Bell Mark L.
Faulkner Kevin M.
Pasterczyk J.
Univation Technologies LLC
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