Patents by Inventor You-Xian Chen

You-Xian Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6635597
    Abstract: A catalyst activator particularly adapted for use in the activation of metal complexes of metals of Group 3-10 for polymerization of ethylenically unsaturated polymerizable monomers, especially olefins, comprising a neutral (Lewis acid) or charge separated (cation/anion pair) comprising a boron ligand containing a fluorinated organic group containing from 10 to 1000 non-hydrogen atoms.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: October 21, 2003
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, Liting Li, You-Xian Chen, Mark H. McAdon, Peter N. Nickias
  • Patent number: 6403733
    Abstract: Organo-Lewis acids of the formula BR′R″2 wherein B is boron, R′ is fluorinated biphenyl, and R″ is a fluorinated phenyl, fluorinated biphenyl, or fluorinated polycyclic fused ring group, and cationic metallocene complexes formed therewith. Such complexes are useful as polymerization catalysts.
    Type: Grant
    Filed: July 5, 2001
    Date of Patent: June 11, 2002
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 6403732
    Abstract: The organo-Lewis acids are novel triarylboranes which are are highly fluorinated. Triarylboranes of one such type contain at least one ring substituent other than fluorine. These organoboranes have a Lewis acid strength essentially equal to or greater than that of the corresponding organoborane in which the substituent is replaced by fluorine, or have greater solubility in organic solvents. Another type of new organoboranes have 1-3 perfluorinated fused ring groups and 2-0 perfluorophenyl groups. When used as a cocatalyst in the formation of novel catalytic complexes with d- or f-block metal compounds having at least one leaving group such as a methyl group, these triorganoboranes, because of their ligand abstracting properties, produce corresponding anions which are capable of only weakly, if at all, coordinating to the metal center, and thus do not interfere in various polymerization processes such as are described.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: June 11, 2002
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 6388114
    Abstract: The (polyfluoroaryl)fluoroanions of aluminum, gallium, and indium are novel weakly coordinating anions which are highly fluorinated. (Polyfluoroaryl)fluoroanions of one such type contain at least one ring substituent other than fluorine. These (polyfluoroaryl)fluoroanions of aluminum, gallium, and indium have greater solubility in organic solvents, or have a coordinative ability essentially equal to or less than that of the corresponding (polyfluoroaryl)fluoroanion of aluminum, gallium, or indium in which the substituent is replaced by fluorine. Another type of new (polyfluoroaryl)fluoroanion of aluminum, gallium, and indium have 1-3 perfluorinated fused ring groups and 2-0 perfluorophenyl groups.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: May 14, 2002
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Publication number: 20020010080
    Abstract: Organo-Lewis acids of the formula BR′R″2 wherein B is boron, R′ is fluorinated biphenyl, and R″ is a fluorinated phenyl, fluorinated biphenyl, or fluorinated polycyclic fused ring group, and cationic metallocene complexes formed therewith. Such complexes are useful as polymerization catalysts.
    Type: Application
    Filed: July 5, 2001
    Publication date: January 24, 2002
    Inventors: Tobin J. Marks, You-Xian Chen
  • Publication number: 20010034424
    Abstract: The organo-Lewis acids are novel triarylboranes which are are highly fluorinated. Triarylboranes of one such type contain at least one ring substituent other than fluorine. These organoboranes have a Lewis acid strength essentially equal to or greater than that of the corresponding organoborane in which the substituent is replaced by fluorine, or have greater solubility in organic solvents. Another type of new organoboranes have 1-3 perfluorinated fused ring groups and 2-0 perfluorophenyl groups. When used as a cocatalyst in the formation of novel catalytic complexes with d- or f-block metal compounds having at least one leaving group such as a methyl group, these triorganoboranes, because of their ligand abstracting properties, produce corresponding anions which are capable of only weakly, if at all, coordinating to the metal center, and thus do not interfere in various polymerization processes such as are described.
    Type: Application
    Filed: May 23, 2001
    Publication date: October 25, 2001
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 6291695
    Abstract: The organo-Lewis acids are novel triarylboranes which are highly fluorinated. Triarylboranes of one such type contain at least one ring substituent other than fluorine. These organoboranes have a Lewis acid strength essentially equal to or greater than that of the corresponding organoborane in which the substituent is replaced by fluorine, or have greater solubility in organic solvents. Another type of new organoboranes have 1-3 perfluorinated fused ring groups and 2-0 perfluorophenyl groups. When used as a cocatalyst in the formation of novel catalytic complexes with d- or f-block metal compounds having at least one leaving group such as a methyl group, these triorganoboranes, because of their ligand abstracting properties, produce corresponding anions which are capable of only weakly, if at all, coordinating to the metal center, and thus do not interfere in various polymerization processes such as are described.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: September 18, 2001
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 6274752
    Abstract: Organo-Lewis acids of the formula BR′R″2 wherein B is boron, R′ is fluorinated biphenyl, and R″ is a fluorinated phenyl, fluorinated biphenyl, or fluorinated polycyclic fused ring group, and cationic metallocene complexes formed therewith. Such complexes are useful as polymerization catalysts.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: August 14, 2001
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 6262200
    Abstract: The (polyfluoroaryl)fluoroanions of aluminum, gallium, and indium are novel weakly coordinating anions which are are highly fluorinated. (Polyfluoroaryl)fluoroanions of one such type contain at least one ring substituent other than fluorine. These (polyfluoroaryl)fluoroanions of aluminum, gallium, and indium have greater solubility in organic solvents, or have a coordinative ability essentially equal to or less than that of the corresponding (polyfluoroaryl)fluoroanion of aluminum, gallium, or indium in which the substituent is replaced by fluorine. Another type of new (polyfluoroaryl)fluoroanion of aluminum, gallium, and indium have 1-3 perfluorinated fused ring groups and 2-0 perfluorophenyl groups.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: July 17, 2001
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 6229034
    Abstract: A trityl perfluorophenyl alumninate such as tris(2,2′,2″-nonafluorobiphenyl)-fluoroaluminate (PBA⊖) and its role as a cocatalyst in metallocene-mediated olefin polymerization is disclosed. Gallium and indium analogs are also disclosed, as are analogs with different anyl groups or different numbers of flourine atoms thereon.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: May 8, 2001
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 6218332
    Abstract: The (polyfluoroaryl)fluoroanions of aluminum, gallium, and indium are novel weakly coordinating anions which are highly fluorinated. (Polyfluoroaryl)fluoroanions of one such type contain at least one ring substituent other than fluorine. These (polyfluoroaryl)fluoroanions of aluminum, gallium, and indium have greater solubility in organic solvents, or have a coordinative ability essentially equal to or less than that of the corresponding (polyfluoroaryl)fluoroanion of aluminum, gallium, or indium in which the substituent is replaced by fluorine. Another type of new (polyfluoroaryl)fluoroanion of aluminum, gallium, and indium have 1-3 perfluorinated fused ring groups and 2-0 perfluorophenyl groups.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: April 17, 2001
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 6130302
    Abstract: Salts of (polyfluoroaryl)fluoroanions of aluminum, gallium, and indium are described. The (polyfluoroaryl)fluoroanions have the formula [ER'R"R'"F].sup..crclbar. wherein E is aluminum, gallium, or indium, wherein F is fluorine, and wherein R', R", and R'" is each a fluorinated phenyl, fluorinated biphenyl, or fluorinated polycyclic group.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: October 10, 2000
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 6087460
    Abstract: The synthesis of the organo-Lewis acid perfluorobiphenylborane (PBB) and the activation of metallocenes for the formation of a variety of highly active homogeneous Ziegler-Natta metallocene olefin polymerization, copolymerization and ring-opening polymerization catalysts is described.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: July 11, 2000
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 5856256
    Abstract: A cationic metallocene complex with trisperfluorobiphenyl borate for use as a polymerization catalyst.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: January 5, 1999
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 5856258
    Abstract: The subject invention involves a method of preparing and the constrained geometry catalyst thereby prepared of the general formula Ar'R4(O)Ar"R'.sub.4 M(CH.sub.2 Ph).sub.2 where Ar' is a phenyl or naphthyl group; Ar" is a cyclopentadienyl or indenyl group, R and R' are H or alkyl substituents (C.ltoreq.10) and M is Ti, Zr or Hf. The synthetic method involves a simple alkane elimination approach which permits a "one-pot" procedure. The catalyst, when combined with a cocatalyst such as Pb.sub.3 C.sup.+ B(Ar.sub.3.sup.F).sub.4 BAr.sub.3.sup.F or methyl alumoxane where Ar.sup.F is a fluoroaryl group, is an effective catalyst for the polymerization of .alpha.-olefins such as ethylene, propylene and styrene.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: January 5, 1999
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen
  • Patent number: 5854166
    Abstract: A trityl perfluorophenyl alumninate such as tris(2,2',2"-nonafluorobiphenyl) fluoroaluminate (PBA.sup.-) and its role as a cocatalyst in metallocene-mediated olefin polymerization is disclosed.
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: December 29, 1998
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, You-Xian Chen