Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
1998-12-18
2001-11-20
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S161000, C526S172000, C526S348500, C526S348600, C526S352000, C526S901000, C502S153000, C502S167000
Reexamination Certificate
active
06320002
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a process to produce bimodal polyolefin using an olefin polymerization catalysts based upon a transition metal compound comprising bidentate ligands containing pyridine or quinoline moieties.
BACKGROUND OF THE INVENTION
The intense commercialization of metallocene polyolefin catalysts has led to widespread interest in the design of non-metallocene, homogeneous catalysts. This field is more than an academic curiosity as new, non-metallocene catalysts may provide an easier pathway to currently available products and may also provide product and process opportunities which are beyond the capability of metallocene catalysts. In addition, certain non-cyclopentadienyl ligands may be more economical due to the relative ease of synthesis of a variety of substituted analogs.
Thus there is a need in the art for new novel olefin polymerization catalysts. U.S. Ser. No. 09/103,620 now U.S. Pat. No. 6,103,657 discloses the use of transition metal compounds comprising bidentate ligands containing pyridine or quinoline moieties and mixtures thereof with activators to polymerize olefins. We have found that the systems in U.S. Ser. No. 09/103,620 now U.S. Pat. No. 6,103,657 can be modified by the direct addition of an additive to produce bimodal products from a single catalyst.
SUMMARY OF THE INVENTION
This invention relates to process for polymerizing olefins comprising contacting an olefin with an olefin polymerization catalyst system comprising the product of the combination of an activator and a transition metal compound based on bidentate ligands containing pyridine or quinoline moieties, such as those described in U.S. application Ser. No. 09/103,620 filed Jun. 23, 1998, now U.S. Pat. No. 6,103,657 which is herein incorporated by reference.
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Mawson Simon
Murray Rex E.
Schreck James D.
Williams Clark C.
Bell Catherine L.
Harlan R.
Jones Lisa Kimes
Sher Jaimes
Univation Technologies LLC
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