Patents Represented by Attorney Wallace L. Oliver
  • Patent number: 7019165
    Abstract: An active and selective hydrocarbon partial oxidation catalyst comprises an activated partially-reduced polyoxometallate, preferably niobium polyoxomolybdate, that is prepared from a suitable polyoxoanion, which has been exchanged with a suitable cation and activated by heating to an activation effective temperature in the presence of a suitable reducing agent such as pyridinium. C3 and C4 hydrocarbons may be partially oxidized selectively to acrylic acid and maleic acid.
    Type: Grant
    Filed: April 11, 2005
    Date of Patent: March 28, 2006
    Assignee: California Institute of Technology
    Inventors: Mark E. Davis, Christopher J. Dillon, Joseph H. Holles, Jay A. Labinger, Axel Brait
  • Patent number: 6926512
    Abstract: A coat hanger extrusion die wherein the aperture of the die land widens along the extrusion axis of the die to the die exit opening, thereby forming an expansion zone.
    Type: Grant
    Filed: December 31, 2001
    Date of Patent: August 9, 2005
    Assignee: BP Corporation North America Inc.
    Inventors: Jesse Wu, James H. Han
  • Patent number: 6914029
    Abstract: An active and selective hydrocarbon partial oxidation catalyst comprises an activated partially-reduced polyoxometallate, preferably niobium polyoxomolybdate, that is prepared from a suitable polyoxoanion, which has been exchanged with a suitable cation and activated by heating to an activation effective temperature in the presence of a suitable reducing agent such as pyridinium. C3 and C4 hydrocarbons may be partially oxidized selectively to acrylic acid and maleic acid.
    Type: Grant
    Filed: November 1, 2002
    Date of Patent: July 5, 2005
    Assignee: California Institute of Technology
    Inventors: Mark E. Davis, Christopher J. Dillon, Joseph H. Holles, Jay A. Labinger, Axel Brait
  • Patent number: 6914085
    Abstract: Expanded granules or a moulded article made therefrom, based on semicrystalline propylene polymer comprising, per 100 parts by weight, less than 0.035 parts by weight of volatile compounds and processes for its preparation.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: July 5, 2005
    Assignee: BP Belgium N.V.
    Inventors: Emmanuel Michel Delaite, Herve Joseph Gislain Cuypers
  • Patent number: 6803339
    Abstract: A metallocene catalyst may be temporarily and reversibly passivated by contact with an effective amount of an unsaturated hydrocarbon passivating compound.
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: October 12, 2004
    Assignee: BP Corporation North America Inc.
    Inventors: Richard A. Hall, Jerome A. Streeky, Roger Uhrhammer
  • Patent number: 6747112
    Abstract: A catalyst system useful to polymerize and co-polymerize polar and non-polar olefin monomers is formed by in situ reduction with a reducing agent of a catalyst precursor comprising {Cp*MRR′n}+{A}− wherein Cp* is a cyclopentadienyl or substituted cyclopentadienyl moiety; M is an early transition metal; R is a C1-C20 hydrocarbyl; R′ are independently selected from hydride, C1-C20 hydrocarbyl, SiR″3, NR″2, OR″, SR″, GeR″3, SnR″3, and C═C-containing groups (R″=C1-C10 hydrocarbyl); n is an integer selected to balance the oxidation state of M; and A is a suitable non-coordinating anionic cocatalyst or precursor. This catalyst system may form stereoregular olefin polymers including syndiotactic polymers of styrene and methylmethacrylate and isotactic copolymers of polar and nonpolar olefin monomers such as methylmethacrylate and styrene.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: June 8, 2004
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, Lubin Luo, Sung Cheol Yoon
  • Patent number: 6670299
    Abstract: A catalyst system useful to polymerize and co-polymerize polar and non-polar olefin monomers is formed by in situ reduction with a reducing agent of a catalyst precursor comprising {CP* MRR′n}+{A}− wherein Cp* is a cyclopentadienyl or substituted cyclopentadienyl moiety; M is an early transition metal; R is a C1-C20 hydrocarbyl; R′ are independently selected from hydride, C1-C20 hydrocarbyl, SiR″3, NR″2, OR″, SR″, GeR″3, SnR″3, and C═C containing groups (R″═C1-C10 hydrocarbyl); n is an integer selected to balance the oxidation state of M; and A is a suitable non-coordinating anionic cocatalyst or precursor. This catalyst system may form stereoregular olefin polymers including syndiotactic polymers of styrene and methylmethacrylate and isotactic copolymers of polar and nonpolar olefin monomers such as methylmethacrylate and styrene.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: December 30, 2003
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, Lubin Luo, Sung Cheol Yoon
  • Patent number: 6642317
    Abstract: The present invention provides a composition, which includes: (a) from 10 to 55 parts by weight of a propylene polymer (A) which includes up to 2% by weight of ethylene and having a melt flow index MFI(A) of 0.1 to 30 g/10 minutes, measured according to ASTM D 1238 (1986) under a load of 2.16 kg at 230° C.; and (b) from 90 to 45 parts by weight of a polymer (B), which is a statistical copolymer of propylene which includes from 1 to 10% by weight of ethylene and having a melt flow index MFI(B) of 0.1 to 30 g/10 minutes; wherein the ethylene concentration of polymer (B) is greater than that of polymer (A). Another embodiment of the invention provides an article, which includes the above-described composition. Another embodiment of the invention provides a process for preparing the above-described composition, which includes two successive polymerization stages, wherein 10 to 55 parts by weight of polymer (A) and from 90 to 45 parts by weight of polymer (B) are respectively prepared.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: November 4, 2003
    Assignee: Polypropylene Belgium Naamlose Vennootschap
    Inventors: Emmanuel Delaite, Hervé Cuypers
  • Patent number: 6586528
    Abstract: The present invention provides a composition, which includes: (a) from 55 to 74 parts by weight of a propylene polymer (A) which includes less than or equal to 1% by weight of ethylene and having a melt flow index (MFI) of 0.1 to 30 g/10 minutes, measured according to ASTM D 1238 (1986) under a load of 2.16 kg at 230° C.; and (b) from 26 to 45 parts by weight of a polymer (B), which is a statistical copolymer of propylene including from 3.5 to 15 wt % of ethylene and having an MFI of 0.1 to 35 g/10 minutes. Another embodiment of the invention provides an article, which includes the above-described composition. Another embodiment of the invention provides a process for preparing the above-described composition, which includes two successive polymerization stages, wherein 55 to 74 parts by weight of polymer (A) and from 26 to 45 parts by weight of polymer (b) are respectively prepared.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: July 1, 2003
    Assignee: Polypropylene Belgium (Naamlose Vennootshap)
    Inventors: Emmanuel Delaite, Hervé Cuypers
  • Patent number: 6562447
    Abstract: Foamable polypropylene composition comprising a polypropylene resin having an D1238L melt flow rate of from about 0.5 to about 30 g/10 min, and a method for extruding rigid, foamed polypropylene sheet with improved surface appearance having a density in the range 0.4 to about 0.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: May 13, 2003
    Assignee: BP Corporation North America Inc.
    Inventors: Jesse Wu, James H. Han, Phil Jacoby, Mark C. Novak, Constantine Metaxas, Chin Choi-Feng, Ray O. Mills, Daan Feng
  • Patent number: 6544922
    Abstract: A catalyst system useful to polymerize and co-polymerize polar and non-polar olefin monomers is formed by in situ reduction with a reducing agent of a catalyst precursor comprising {Cp*MRR′n}+{A}− wherein Cp* is a cyclopentadienyl or substituted cyclopentadienyl moiety; M is an early transition metal; R is a C1-C20 hydrocarbyl; R′ are independently selected from hydride, C1-C20 hydrocarbyl, SiR″3, NR″2, OR″, SR″, GeR″3, and SnR″3 containing groups (R″=C1-C10 hydrocarbyl); n is an integer selected to balance the oxidation state of M; and A is a suitable non-coordinating anionic cocatalyst or precursor. This catalyst system may form stereoregular olefin polymers including syndiotactic polymers of styrene and methylmethacrylate and isotactic copolymers of polar and nonpolar olefin monomers such as methylmethacrylate and styrene.
    Type: Grant
    Filed: July 18, 2002
    Date of Patent: April 8, 2003
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, Lubin Luo, Sung Cheol Yoon
  • Patent number: 6534672
    Abstract: A catalytically active material useful to prepare vinyl acetate monomer from ethylene, acetic acid, and an oxygen-containing gas under fluid bed conditions comprises a porous microspheroidal support containing catalytically active palladium crystallites finely dispersed within the support. This catalyst material does not require incorporation of gold to maintain activity and selectivity. A process to produce a vinyl acetate fluid bed catalyst in which catalytically active small palladium crystallites are finely dispersed within the support comprises dispersing selected metal species within the support which have an affinity to palladium to form very fine crystallites of palladium. The affinity metal species may be dispersed by impregnation onto a preformed microspheroidal support or may be intimately incorporated within the support before impregnation with a soluble palladium species.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: March 18, 2003
    Assignee: The Standard Oil Company
    Inventors: George Frederick Salem, Michael James Baker
  • Patent number: 6521675
    Abstract: Foamable polypropylene composition comprising a polypropylene resin having an D1238L melt flow rate of from about 0.5 to about 30 g/10 min, and a method for extruding rigid, foamed polypropylene sheet with improved surface appearance having a density in the range 0.4 to about 0.8 g/cm3.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: February 18, 2003
    Assignee: BP Corporation North America Inc.
    Inventors: Jesse Wu, James H. Han, Phil Jacoby, Mark C. Novak, Constantine Metaxas, Chin Choi-Feng, Ray O. Mills
  • Patent number: 6485664
    Abstract: A method to melt process a thermoplastic, partially-crystalline, olefin polymer in a multi-temperature stage extruder wherein the polymer has a broad melting temperature range comprises setting the temperature profile of the extruder such that a portion of the polymer crystallizes in the extruder and passing the resulting partially-crystallized polymer through an extruder die.
    Type: Grant
    Filed: January 11, 2000
    Date of Patent: November 26, 2002
    Assignee: BP Corporation North America Inc.
    Inventor: Michael Wreschinsky
  • Patent number: 6479424
    Abstract: A ligand useful to form a metallocene olefin polymerization catalyst comprises: wherein at least R3 and R4 are substituents having at least a bulk of a t-butyl group and, optionally, wherein R1 or R2 may be a bulky substituent group.
    Type: Grant
    Filed: December 13, 1999
    Date of Patent: November 12, 2002
    Assignee: BP Corporation North America Inc.
    Inventors: Andreas B. Ernst, Eric J. Moore, Charles L. Myers, Roger W. Quan
  • Patent number: 6399813
    Abstract: A process for the preparation of a fluid bed vinyl acetate (VAM) catalyst comprising impregnating a support comprising a mixture of substantially inert microspheroidal particles with a solution comprising a metal salt of Pd and M, wherein M comprises Ba, Cd, Au, La, Nb, Ce, Zn, Pb, Ca, Sr, Sb or mixtures thereof, reducing the metal salts to form a deposit of Pd and M on the support surface and impregnating the support with at least one alkali metal salt. At least 50% of the particles used for the microspheroidal support have a particle size below 105 microns.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: June 4, 2002
    Assignee: The Standard Oil Company
    Inventors: Patricia Rae Blum, Larry Michael Cirjak, Marc Anthony Pepera, Christos Paparizos, George Frederick Salem, Michael James Baker
  • Patent number: 6395676
    Abstract: A process for the preparation of a fluid bed vinyl acetate (VAM) catalyst comprising impregnating a support comprising a mixture of substantially inert microspheroidal particles with a solution comprising a metal salt of Pd and M, wherein M comprises Ba, Cd, Au, La, Nb, Ce, Zn, Pb, Ca, Sr, Sb or mixtures thereof, reducing the metal salts to form a deposit of Pd and M on the support surface and impregnating the support with at least one alkali metal salt. At least 50% of the particles used for the microspheroidal support have a particle size below 105 microns.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: May 28, 2002
    Assignee: The Standard Oil Company
    Inventors: Patricia Rae Blum, Larry Michael Cirjak, Marc Anthony Pepera, Christos Paparizos, George Frederick Salem, Michael James Baker
  • Patent number: 6383425
    Abstract: An improved coat hanger extrusion die wherein the aperture of the die land widens along the extrusion axis of said die to the die exit opening, thereby forming an expansion zone, and a method for extruding foamed polypropylene sheet having an improved surface appearance.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: May 7, 2002
    Assignee: BP Corporation North America Inc.
    Inventors: Jesse Wu, James H. Han
  • Patent number: 6358882
    Abstract: A catalytically active material useful to prepare vinyl acetate monomer from ethylene, acetic acid, and an oxygen-containing gas under fluid bed conditions comprises a porous microspheroidal support containing catalytically active palladium crystallites finely dispersed within the support. This catalyst material does not require incorporation of gold to maintain activity and selectivity. A process to produce a vinyl acetate fluid bed catalyst in which catalytically active small palladium crystallites are finely dispersed within the support comprises dispersing selected metal species within the support which have an affinity to palladium to form very fine crystallites of palladium. The affinity metal species may be dispersed by impregnation onto a preformed microspheroidal support or may be intimately incorporated within the support before impregnation with a soluble palladium species.
    Type: Grant
    Filed: November 15, 1999
    Date of Patent: March 19, 2002
    Assignee: The Standard Oil Company
    Inventors: George Frederick Salem, Michael James Baker
  • Patent number: 6350054
    Abstract: Improved apparatus for mechanically stirring a quench-cooled subfluidized particulate bed of polymerized monomer lowers lumping of polymer particles by using substantially contiguous paddle stations disposed along the drive shaft within the reactor in combination with a plurality of sub-stations in at least one paddle station class, each sub-station having a width along the shaft of no more than 50 percent of the total width of the paddle station, and sub-station paddles attached to the shaft at each sub-station so as to sweep through the particulate bed.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: February 26, 2002
    Assignee: BP Corporation North America Inc.
    Inventors: James Hanawalt Lee, Chi-Hung Lin, Barry F. Wood