Patents Assigned to Kerr-McGee Chemical Corporation
  • Patent number: 5976237
    Abstract: Improved coated inorganic pigments having a first coating of Al.sub.2 O.sub.3, SiO.sub.2, or optionally other oxide such as a source of P.sub.2 O.sub.5, or mixtures thereof, an optional coating of ZrO.sub.2, SnO.sub.2, TiO.sub.2, SiO.sub.2, CeO.sub.2 or mixtures thereof, and a final coating of Al.sub.2 O.sub.3 which exhibit good durability, dispersibility, and optical properties in plastic or paint compositions are disclosed. Also disclosed is a process whereby an aqueous slurry of an inorganic pigment is milled to achieve a particular particle size distribution, a first coating of Al.sub.2 O.sub.3, SiO.sub.2, or optionally other oxide such as a source of P.sub.2 O.sub.5, or mixtures thereof is precipitated onto the pigment material within a first pH range, an optional amount of ZrO.sub.2, SnO.sub.2, SiO.sub.2, TiO.sub.2, CeO.sub.2 or mixtures thereof is added to the aqueous slurry within a second pH range to obtain an optional coating over the first coating, and a final coating of Al.sub.2 O.sub.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: November 2, 1999
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: John E. Halko, Fran Tyler
  • Patent number: 5840112
    Abstract: A process for reacting titanium tetrachloride vapors with oxygen including a first oxygen preheat assembly for preheating oxygen to a first predetermined temperature and a titanium tetrachloride preheat assembly for preheating titanium tetrachloride to a relatively low, temperature. The process includes adding a second oxygen preheat assembly for preheating oxygen to a second temperature substantially below the first temperature, and includes a second reaction zone adapted for receiving the mixture from the first reaction zone, the oxygen at the second temperature being reacted with the titanium tetrachloride in the mixture from the first reaction zone to produce titanium dioxide. Also provided is a process for the preparation of titanium dioxide comprising reacting titanium tetrachloride with oxygen at an elevated pressure and at a temperature above about 1750.degree. F.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: November 24, 1998
    Assignee: Kerr McGee Chemical Corporation
    Inventors: A. J. Morris, J. C. Magyar, G. D. Wootten, W. A. Yuill
  • Patent number: 5830929
    Abstract: Thermoplastic concentrates comprising inorganic pigments, such as titanium dioxide, treated with a dialkyl sulfosuccinate treating agent, of the formula ROOCCHSO.sub.3 MCH.sub.2 COOR', where R and R' are monovalent alkyl radicals containing from about 2 to about 20 carbon atoms and M is a metallic monovalent cation, are disclosed. Such treatment improves the dispersibility of the pigments in thermoplastic resins. The treatment also enables the production of thermoplastic concentrates comprising a high percentage of treated inorganic pigment dispersed in a thermoplastic resin.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: November 3, 1998
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: Rodney D. Stramel
  • Patent number: 5789112
    Abstract: A method for manufacturing Li.sub.2 M.sub.b Mn.sub.2-b O.sub.4 which comprises the steps of providing LiM.sub.b Mn.sub.2-b O.sub.4 ; providing a lithium salt; forming a mixture of the LiM.sub.b Mn.sub.2-b O.sub.4 and lithium salt in a liquid medium; adding a reducing agent to the mixture; heating for sufficient time to effect substantially complete conversion; and separating the product Li.sub.2 M.sub.b Mn.sub.2-b O.sub.4 .
    Type: Grant
    Filed: February 3, 1997
    Date of Patent: August 4, 1998
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: Paul C. Ellgen
  • Patent number: 5766569
    Abstract: A method for manufacturing Li.sub.1+x Mn.sub.2 O.sub.4 comprising the steps of providing LiMn.sub.2 O.sub.4 or .beta.-MnO.sub.2 ; providing a source of lithium; dissolving lithium from the lithium source in a liquid medium in which lithium generates solvated electrons or the reduced form of an electron-transfer catalyst; and contacting the LiMn.sub.2 O.sub.4 or .beta.-MnO.sub.2 with the liquid medium containing the dissolved lithium and the solvated electrons or the reduced form of the electron-transfer catalyst.
    Type: Grant
    Filed: January 17, 1996
    Date of Patent: June 16, 1998
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: Paul C. Ellgen, Terrell N. Andersen
  • Patent number: 5730796
    Abstract: Pigmentary titanium dioxide having a high durability when used in paint or the like exposed to solar radiation and methods of producing such pigmentary titanium dioxide are provided. The durable pigmentary titanium dioxide of the invention is comprised of rutile titanium dioxide particles having cerium oxide and dense amorphous silica deposited thereon. The particles preferably also have an outer coating of hydrous alumina deposited thereon.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: March 24, 1998
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: John R. Brand, Roger A. Baldwin, Thomas Ian Brownbridge
  • Patent number: 5700318
    Abstract: Improved alumina-coated inorganic pigments having a first coating of boehmite alumina, a second coating of amorphous alumina, and a third coating of boehmite alumina which exhibit good durability, dispersibility, and optical properties in plastic compositions are disclosed. Also disclosed is a process whereby an aqueous slurry of an alumina-containing inorganic pigment is milled to achieve a particular particle size distribution, a first coating of boehmite alumina is precipitated onto the pigment material within a first pH range, a second amount of an alumina coating agent is added to the aqueous slurry within a second pH range to obtain a second coating of amorphous alumina over the first boehmite alumina coating, and then the pH of the slurry is adjusted to a third pH range thus forming a third boehmite alumina coating over the second amorphous alumina coating.
    Type: Grant
    Filed: April 16, 1996
    Date of Patent: December 23, 1997
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: John R. Brand, Kelly A. Green
  • Patent number: 5669509
    Abstract: A method for separating coarse particles from TiO.sub.2 powder in a fine powder composition by the steps of: providing a system in which a source of the fine powder composition communicates with a minimally fluidizable bed of the fine powder composition within the system; delivering the fine powder composition from the source to the bed; imparting energy into the bed and delivering a fluidizing gas to the bed at a rate to cause the TiO.sub.2 powder and coarse particles of the fine powder composition to separate into a TiO.sub.2 powder phase and a coarse particle phase; removing the TiO.sub.2 powder from the system; and removing the coarse particles from the system.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: September 23, 1997
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: Larry G. Sherman
  • Patent number: 5641468
    Abstract: A method for manufacturing Li.sub.2 Mn.sub.2 O.sub.4 comprising the steps of providing LiMn.sub.2 O.sub.4 ; providing a source of lithium; dissolving lithium from the lithium source in a liquid medium in which lithium generates solvated electrons or the reduced form of an electron-transfer catalyst; and contacting the LiMn.sub.2 O.sub.4 with the liquid medium containing the dissolved lithium and the solvated electrons or the reduced form of the electron-transfer catalyst.
    Type: Grant
    Filed: September 7, 1995
    Date of Patent: June 24, 1997
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: Paul C. Ellgen
  • Patent number: 5641465
    Abstract: A method for manufacturing Li.sub.2 Mn.sub.2 O.sub.4 comprising the steps of providing .beta.-MnO.sub.2 or .lambda.-MnO.sub.2 ; providing a source of lithium; dissolving lithium from the lithium source in a liquid medium in which lithium generates solvated electrons or the reduced form of an electron-transfer catalyst; and contacting the .beta.-MnO.sub.2 or .lambda.-MnO.sub.2 with the liquid medium containing the dissolved lithium and the solvated electrons or the reduced form of the electron-transfer catalyst.
    Type: Grant
    Filed: September 7, 1995
    Date of Patent: June 24, 1997
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: Paul C. Ellgen, Terrell N. Andersen
  • Patent number: 5639438
    Abstract: A method for manufacturing Li.sub.2 M.sub.b Mn.sub.2-b O.sub.4 which comprises the steps of providing LiM.sub.b Mn.sub.2-b O.sub.4 ; providing a lithium salt; forming a mixture of the LiM.sub.b Mn.sub.2-b O.sub.4 and lithium salt in a liquid medium; adding a reducing agent to the mixture; heating for sufficient time to effect substantially complete conversion; and separating the product Li.sub.2 M.sub.b Mn.sub.2-b O.sub.4.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: June 17, 1997
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: Paul C. Ellgen
  • Patent number: 5556600
    Abstract: A method and apparatus for producing TiO.sub.2 by reacting O.sub.2 and TICl.sub.4 in a reactor tube wherein pressure fluctuations in the flow of fluids through the reactor tube are sensed and output signals are generated proportional to the sensed pressure fluctuations. The flow of at least one of the TiCl.sub.4 or O.sub.2 is then varied through the reactor tube in response to predetermined pressure fluctuations so as to increase the efficiency of the reaction between TiCl.sub.4 and the O.sub.2. The efficiency of the reaction between O.sub.2 and TiCl.sub.4 in the reactor tube is achieved by a control apparatus operably connected to the reactor assembly which is capable of monitoring pressure fluctuations in TCl.sub.4 and O.sub.2 through the reactor assembly so that the flow of at least one of the TiCl.sub.4 or O.sub.2 can be varied in response to predetermined pressure fluctuations. The control apparatus includes a sensor assembly, a signal conditioning unit and a signal processing unit.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: September 17, 1996
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: Vernon D. Gebben, Walter D. Bruce
  • Patent number: 5544817
    Abstract: A method for milling a powder in a high energy mill which includes steps of forming a milling slurry including a naturally occurring zirconium silicate sand grinding medium having a density in the range of from about 4 g/cc absolute to about 6 g/cc absolute. Also provided is a grinding medium including naturally occurring zirconium silicate sand characterized by a density in the range of from about 4 g/cc absolute to about 6 g/cc absolute.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: August 13, 1996
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: Thomas I. Brownbridge, Phillip M. Story
  • Patent number: 5510561
    Abstract: A discrete catalyst and processes for the alkylation of isoalkanes with alkenes under homogenous fluid conditions. The catalyst is formed by contacting, under fluid conditions, a homogenous fluid containing a paraffin hydrocarbon having from 4 to 12 carbon atoms with a Lewis acid/protic Bronsted acid pair to produce a discrete catalytic complex that is soluble in the fluid. The discrete catalyst is the reaction product of the acid pair and alkanes and includes hydrocarbon ligands of limited chain length rendering it soluble in the fluid. The catalyst is active for the alkylation of isoalkanes, under homogenous fluid conditions.
    Type: Grant
    Filed: March 6, 1995
    Date of Patent: April 23, 1996
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: Larry G. Sherman, William A. Yuill
  • Patent number: 5507439
    Abstract: A method for producing a milled powder including imparting an electrostatic charge to the starting powder and milling the electrostatically charged starting powder is provided.
    Type: Grant
    Filed: November 10, 1994
    Date of Patent: April 16, 1996
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: Phillip M. Story
  • Patent number: 5504134
    Abstract: Improved methods and polymer compositions are provided whereby ultraviolet radiation degradation of substrates formed of the compositions is attenuated. In accordance with the invention, ultraviolet scattering and absorbing particles having a particle size in the range of from about 0.001 micrometer to about 0.20 micrometer in diameter are dispersed in at least a surface layer of a polymer substrate.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: April 2, 1996
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: Bruce R. Palmer, James W. Kauffman, Penelope Stamatakis
  • Patent number: 5485955
    Abstract: A rail-tie fastening assembly for fastening a rail to a concrete tie comprising a rail seat assembly and a rail anchor. The rail seat assembly includes a rail seat basin and a rail seat wherein the rail seat is disposed in the rail seat basin and bonded thereto with an elastomeric material having a void formed therein between the bottom of the rail seat and the bottom of the rail seat basin so as to produce a shear spring which transfers applied vertical load from the rail to the tie. The rail seat assembly is embedded in the tie and the rail anchor is adapted to engage a portion of the rail and to interlock with the rail seat assembly so as to cooperate with the rail seat assembly to fasten the rail to the tie.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: January 23, 1996
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: S. Hudson Owen
  • Patent number: 5405594
    Abstract: A method of preconditioning manganese dioxide for use in a rechargeable alkaline electrochemical cell. The method includes the step of contacting unreduced manganese dioxide (e.g., electrolytic manganese dioxide) with a solution of hydroquinone in an environment having a pH greater than or equal to 5 that is essentially free of dissolved oxygen to partially reduce the unreduced manganese dioxide to manganese dioxide generally represented by the formulaMnO.sub.xwherein x is between about 1.80 and about 1.92. Partially reducing the manganese dioxide to an oxidation state in this range before the cell is finally assembled and sealed lessens the degree by which the capacity of the cell is decreased as the cell is cycled and improves the overall performance of the cell.
    Type: Grant
    Filed: August 16, 1993
    Date of Patent: April 11, 1995
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: Terry N. Andersen, Janet M. Berry, Joseph M. Derby
  • Patent number: 5397391
    Abstract: A pigment composition of improved dispersibility in thermoplastic resins and concentrates of the pigment composition in thermoplastic resin are provided. The pigment composition is comprised of an inorganic pigment such as titanium dioxide having an organophosphate ester treating agent deposited thereon.
    Type: Grant
    Filed: April 4, 1994
    Date of Patent: March 14, 1995
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: Rodney D. Stramel
  • Patent number: 5362770
    Abstract: A method of increasing the hydrophobicity of solid materials. The inventive method comprises the steps of: (a) metal ion activating the surface of a solid substrate material to provide reactive metal sites on the surface and (b) chemically bonding a surfactant to the surface at the reactive metal sites. Titanium dioxide pigments and other particulate property modifiers treated in accordance with the inventive method are more readily dispersed in polymer compositions.
    Type: Grant
    Filed: May 14, 1993
    Date of Patent: November 8, 1994
    Assignee: Kerr-McGee Chemical Corporation
    Inventors: Bruce R. Palmer, Rodney D. Stramel