Class of metallocenes and method of producing polyethylene

Details Class of metallocenes and method of producing polyethylene Class of metallocenes and method of producing polyethylene

2005-06-28

2005-06-28

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...

C526S160000, C526S348500, C526S943000, C526S901000

Reexamination Certificate

active

06911508

ABSTRACT:
The invention provides a catalyst system and a method of making polyethylene using the catalyst system, the method comprising combining ethylene; an activator; and a metallocene catalyst compound; wherein in one embodiment the metallocene catalyst compound is selected from:wherein M is a Group 4 atom; X is a leaving group; n is an integer from 0 to 3; and R1to R12are independently selected from hydrides, halogens, hydroxy, C1to C6alkoxys, C1to C6alkenyls, and C1to C10alkyls; characterized in that when the comonomer is 1-hexene, and the mole ratio of 1-hexene to ethylene combined is varied between 0.015 to 0.05, the density of the resultant polyethylene changes by less than 5% and the I21/I2varies from 10 to 150.

REFERENCES:
patent: 6180736 (2001-01-01), Muhle et al.
patent: 6207606 (2001-03-01), Lue et al.
patent: 6339134 (2002-01-01), Crowther et al.
patent: 6388115 (2002-05-01), Crowther et al.
patent: 6410659 (2002-06-01), Maddox et al.
patent: 6489413 (2002-12-01), Floyd et al.
patent: 6642400 (2003-11-01), Holtcamp et al.
patent: 2001/0034298 (2001-10-01), Isobe et al.
patent: WO 94/03506 (1994-02-01), None
patent: WO 98/28350 (1998-07-01), None
patent: WO 03/008465 (2003-01-01), None
patent: WO 03/008468 (2003-01-01), None
patent: WO 03/037938 (2003-05-01), None
Chirik, Paul J., et al.,“Preparation and Characterization of Monomeric and Dimeric Group IV Metallocene Dihyrides Having Alkyl-Substituted Cyclopentadienyl Ligands,”Organometallics 18, 1873-1881 (1999).
Lofthus, Owen W., et al.,“Electrophile-Functionalized Metallocene Intermediates. Application in the Diastereoselective Synthesis of a Tetramethyldisiloxane-Bridged C2-Symmetric ansa-Zirconocene Dibromide,”Organometallics 18, 3702-3708 (1999).
Lehtinen, Christel et al.“A Comparison of(η-butCp)2ZrCi2and Other Simple Metallocenes with Bridged Et(Ind)2ZrCl2and Me2Si(Ind)2ZrCl2in Ethene/Propene Copolymerization,”European Polymer Journal 33(1), 115-120 (1997).
Suhm, J.,“Influence of metallocene structures on ethene copolymerization with 1-butene and 1-octene,”Journal of Molecular Catalysis A: Chemical 128(1-3) 215-227 (1998).
Löfgren, B.,“New olefin copolymers synthesized by metallocenes,”Recent Res. Devel. in Macromol. Res., 3, 117-131 (1998).
Suhm, J., et al.,“Temperature Dependence of Copolymerization Parameters in Ethene/1-Octene Copolymerization Using Homogeneous rac-Me2Si(2-MeBenz[e]Ind)2ZrCl2/MAO Catalyst,”Journal of Polymer Science, Part A: Polymer Chemistry 35, 735-740 (1997).
Schneider, M.J., et al.“Influence of Indenyl Ligand Substitution Pattern on Metallocene-Catalyzed Ethene Copolymerization with 1-Octene,”Macromolecules 30, 3164-3168 (1997).
Karol, Frederick J., et al.,“Features of Cyclopentadienyl Metal Catalysts for Ethylene Copolymerization in Gas and Liquid Phase” Metalorganic Catalysts for Synthesis and Polymerization629-642, (Walter Kaminsky, Ed., Springer 1999).
Bruaseth, Ingvild et al.“Dual Site Ethene/1-Hexene Copolymerization with MAO Activated(1,2,4-Me3Cp)2ZrCl2and(Me5Cp)2ZrC12 Catalysts. Possible Transfer of Polymer Chains between the Sites,”Macromolecules 36(9), 3026-3034 (2003).
Möhring, Petra C.,“Homogeneous Group 4 metallocene Ziegler-Natta catalysts: the influence of cyclopentadienyl-ring substituents,”Journal of Organometallic Chemistry 479, 1-29 (1994).
Brintzinger, Hans H.,“Stereospecific Olefin Polymerization with Chiral Metallocene Catalysts,”Angew. Chem. Int. Ed. Engl., 34, 1143-1170 (1995).
Galland, G.B., et al.,“Linear low-density polyethylene synthesis promoted by homogeneous and supported catalysts,”Polymer International 48, 660-664 (1999).
Wigum, Hanne, et al.,“Structure-Property Transition-State Model for the Copolymerization of Ethene and 1-Hexene with Experimental and Theoretical Applications to Novel Disilylene-Bridge Zirconocenes,”Journal of Polymer Science, Part A: Polymer Chemistry 41(11), 1622-1631 (2003).

Affiliated with

Also associated with

Rating

Class of metallocenes and method of producing polyethylene does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Class of metallocenes and method of producing polyethylene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Class of metallocenes and method of producing polyethylene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3479369