Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-03-27
2007-03-27
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...
C526S113000, C526S116000, C526S172000, C526S161000
Reexamination Certificate
active
11172730
ABSTRACT:
Ethylene and optional comonomers are polymerized in the presence of an organozinc compound and a catalyst system to produce an ethylene polymer. The catalyst system comprises a bridged indenoindolyl Group 3-10 transition metal complex and an activator. The organozinc compound is used in an amount effective to increase the polymer bulk density compared with that observed in the absence of the organozinc compound. The organozinc compound can also narrow the particle size distribution of the polymer and the wt. % of polyolefin chunks produced. The operability of processes utilizing bridged indenoindolyl metal complexes is enhanced while maintaining desirably high polyolefin molecular weights.
REFERENCES:
patent: 5153157 (1992-10-01), Hlatky et al.
patent: 5198401 (1993-03-01), Turner et al.
patent: 5241025 (1993-08-01), Hlatky et al.
patent: 5414180 (1995-05-01), Geerts et al.
patent: 5648440 (1997-07-01), Sugano et al.
patent: 6232260 (2001-05-01), Nagy et al.
patent: 6451724 (2002-09-01), Nifant'ev et al.
patent: 6559251 (2003-05-01), Wang et al.
patent: 6693155 (2004-02-01), Meverden et al.
patent: 6794468 (2004-09-01), Wang
patent: 6818713 (2004-11-01), Wang et al.
patent: 6838410 (2005-01-01), Wang et al.
patent: 6908972 (2005-06-01), Tsuie et al.
patent: 6933353 (2005-08-01), Wang
patent: WO 99/24446 (1999-05-01), None
patent: WO 01/53360 (2001-07-01), None
Jüngling et al., “Cooperative effects in binuclear zirconocenes: their synthesis and use as catalyst in propene polymerization”,Journal of Organometallic Chemistry, 460 (1993) 191-195.
Noh et al., “Synthesis, characterization, and reactivities of the polysiloxane-bridged binuclear metallocenes tetramethyldisiloxanediylbis(cyclopentadienyltitanium trichloride) and hexamethyltrisiloxanediylbis (cyclopentadienyltitanium trichoride)”,Journal of Organometallic Chemistry, 518 (1996) 1-6.
Noh et al., “Syntheses of polymethylene bridged dinuclear zirconocenes and investigation of their polymerization activities”,Journal of Organometallic Chemistry, 580 (1999) 90-97.
Klug Kenneth J.
Wang Shaotian
Equistar Chemicals LP
Lee Rip A.
Schuchardt Jonathan L.
Wu David W.
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