Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2001-09-06
2003-11-11
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...
C526S126000, C526S161000, C526S172000, C526S943000, C502S103000, C502S152000, C502S155000, C556S011000, C556S052000
Reexamination Certificate
active
06646071
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a class of metal complexes, the ligands used to prepare these metal complexes and to olefin polymerization catalysts derived therefrom that are particularly suitable for use in a polymerization process for preparing polymers by polymerization of &agr;-olefins and mixtures of &agr;-olefins.
BACKGROUND
Constrained geometry metal complexes and methods for their preparation are disclosed in U.S. Pat. No. 5,703,187; U.S. Pat. No. 5,321,106; U.S. Pat. No. 5,721,185; U.S. Pat. No. 5,374,696; U.S. Pat. No. 5,055,438; U.S. Pat. No. 5,057,475; U.S. Pat. No. 5,096,867; U.S. Pat. No. 5,064,802; U.S. Pat. No. 5,132,380; U.S. Pat. No. 5,470,993, as well as EP-A-514,828, and elsewhere.
U.S. Pat. No. 5,350,817 and U.S. Pat. No. 5,304,614 disclose bridged zirconocene complexes, wherein two indenyl groups are covalently linked together by a bridge containing carbon or silicon, which are useful for the polymerization of propylene.
EP-A-577,581 discloses unsymmetrical bis-Cp metallocenes containing a fluorenyl ligand with heteroatom substituents.
E. Barsties; S. Schaible; M.-H. Prosenc; U. Rief; W. Roll; O. Weyland; B. Dorerer; H.-H. Brintzinger
J. Organometallic Chem
. 1996, 520, 63-68, and H. Plenio; D. Birth
J. Organometallic Chem
. 1996, 519, 269-272 disclose systems in which the cyclopentadienyl ring of the indenyl is substituted with a dimethylamino group in non-bridged and Si-bridged bis-indenyl complexes useful for the formation of isotactic polypropylene and polyethylene.
Disclosure of random heteroatom substitution in mono-Cp metallocenes is found in EP-A-416,815, WO 95/07942, WO 96/13529, and U.S. Pat. No. 5,096,867 and U.S. Pat. No. 5,621,126. Specific heteroatom substitution of the 3- and 2-position of indenyl complexes of group 4 metals was disclosed in WO 98/06727 and WO/98/06728 respectively. The foregoing specifically substituted metal complexes have produced improved catalyst results, however, problems still remain with catalyst efficiency and deactivation of the catalyst under high temperature polymerization conditions. It would be advantageous to be able to produce polyolefins with higher molecular weights. It would also be advantageous to be able to improve other physical characteristics of the polymers produced by altering the substitution around the cyclopentadienyl group of the metallocene complexes used in olefin polymerization catalyst systems.
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Plenio et al., J. Organometallic Chem. 519 (1996) 269-272.*
E. Barsties, S. Schaible, M. H. Prosenc, U. Rief, W. Roll, O. Weyland, B. Dorerer, and H. H. Brintzinger.
J. Organometallic Chem. 1996, 519, 269-272, H. Plenio, and D. Birth Chemical Abstracts vol. 13, No. 11, Abstract #. 144972q, Iwase, K, “Preparation of Ethylen-Stryene Copolymer and Its Polymerization Catalysts Containing Group IVB Metal Complexes” (XP 002139516), 1999.
Journal of Chemical Society. Vol 88, No. 3, 1996 pp. 446-452. Dahl, L. F. et al, Preparation and Structures of Methyl Phenylpropilate-Iron Carbonyl Complexes. A New DICARBON7YL-PI-Cyclopentadienyloxy-Sigma—VI Nyliron Compound.
JACS 88:3 (1996) 446-452.
Klosin Jerzy
Nickias Peter N.
Rabago R.
The Dow Chemical Company
Wu David W.
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