Silicon Containing Patents (Class 106/446)
  • Patent number: 5792250
    Abstract: This invention relates to a process for the production of inorganically coated pigments and fillers and to the use thereof.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: August 11, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf-Michael Braun, Jurgen Kischkewitz, Hilmar Rieck, Udo Holtmann
  • Patent number: 5766336
    Abstract: Colored pigments are provided from the green-yellow to red spectrum based on oxide-nitrides with two or three different cations Q, R and S in the crystal lattice, wherein the nitrogen to oxygen atomic ratio is determinative for the color. These pigments crystallise in the pyrochlore, spinel or elpasolite structure. Pigments in the perovskite are as provided with increased color brilliance. The color of the pigments can be adjusted in a wide range of the color spectrum during their preparation within a substance class with the cations Q, R and S and while retaining the crystal structure, by increasing or lowering the atomic ratio N to O in the oxide-nitride and bringing about the required charge balancing by replacing an equivalent quantity of the cation Q with the valency q by a cation R with the valency q+1.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: June 16, 1998
    Assignee: Cerdec Aktiengesellschaft Keramische Farben
    Inventors: Martin Jansen, Hans-Peter Letschert
  • Patent number: 5759255
    Abstract: A pearlescent pigment having improved humidity resistance and weatherability is realized by a metal oxide-coated mica pearlescent pigment which has an aluminum or an aluminum-cerium combined with a hydrolyzed silane coupling agent treated surface.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: June 2, 1998
    Assignee: Engelhard Corporation
    Inventors: Michael T. Venturini, Carolyn Lavallee, Deborah Cacace
  • Patent number: 5753025
    Abstract: A base TiO.sub.2 pigment particles bearing coatings of a boria-modified silica and alumina is disclosed.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: May 19, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Charles Robert Bettler, Howard Wayne Jacobson, Michael R. Baloga, Max H. Lewis
  • Patent number: 5733365
    Abstract: A process for preparing a low-dusting, free-flowing pigment which has not been subjected to any micronizing treatment comprising the steps of providing an inorganic pigment material; providing a source of water; forming a fine, well dispersed slurry of the pigment and water; milling the slurry; depositing a treating agent having the formula ROOCCHSO.sub.3 MCH.sub.2 COOR' wherein R and R' are monovalent alkyl radicals having from about 2 to about 20 carbon atoms, and M is a metallic monovalent cation on the slurried milled pigment; and drying the pigment material having a treating agent deposited thereon. The invention also provides the free-flowing pigments produced by this process.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: March 31, 1998
    Assignee: Kerr-McGee Corporation
    Inventors: John E. Halko, Phillip M. Story, James W. Kauffman, Kelly A. Green
  • Patent number: 5733364
    Abstract: Goniochromatic luster pigments based on multiply coated platelet-shaped metallic substrates comprising at least one layer packet ofA) a layer consisting essentially of silicon oxide, silicon oxide hydrate, aluminum oxide and/or aluminum oxide hydrate, andB) a metallic layer which consists essentially of aluminum and is at least partially transparent to visible light,and also, if desired, additionallyC) an outer layer which consists essentially of colorless or selectively absorbing metal oxide and/or is phosphate-, chromate- and/or vanadate-containing,are useful for coloring paints, inks, including printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations.
    Type: Grant
    Filed: April 25, 1996
    Date of Patent: March 31, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Raimund Schmid, Norbert Mronga, Jorg Adel
  • 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: 5730795
    Abstract: This invention provides a process for making titanium dioxide pigment, wherein an aqueous slurry of hydrous oxide surface-treated TiO.sub.2 particles is subjected to media milling. The TiO.sub.2 particles are surface-treated with a coating comprising a hydrous oxide such as silica and/or alumina, and the slurry is filtered prior to media milling. The milled slurry is dried and the dried product is fluid-energy milled to produce TiO.sub.2 pigment having good particle size distribution. The TiO.sub.2 pigments may be used to make coating formulations having high gloss.
    Type: Grant
    Filed: September 24, 1996
    Date of Patent: March 24, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Scott Matthew Herkimer
  • Patent number: 5728205
    Abstract: The present invention provides a process for producing titanium dioxide (TiO.sub.2) pigment comprising boron oxide (B.sub.2 O.sub.3), comprising the steps of: (a) reacting titanium tetrachloride (TiCl.sub.4) in the vapor phase with an aluminum compound and an oxygen-containing gas in a reactor at a temperature in the range of about 900.degree. C. to about 1600.degree. C. to provide a gaseous suspension comprising TiO.sub.2 particles, and (b) contacting the gaseous suspension comprising the TiO.sub.2 particles with a boron compound to produce TiO.sub.2 pigment comprising B.sub.2 O.sub.3.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: March 17, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alvin Allen, John Steven Gergely
  • Patent number: 5711798
    Abstract: A pigment containing low-order titanium oxide of this invention is characterized in that both aluminum oxide and silicon oxide exist together with low-order titanium oxide. A method of manufacturing such a pigment comprises the steps of; presenting an aluminum compound and silicon as a reducing agents together with titanium dioxide: and then heating and reducing the mixture in an atmosphere having a low oxygen content. According to this method, the pigment containing low-order titanium oxide can efficiently be manufactured, while preventing sintering generated due to the fusion between the reducing agents or the reducing agents and powders.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: January 27, 1998
    Assignee: Shiseido Co., Ltd.
    Inventors: Shoichiro Shio, Fukuji Suzuki
  • Patent number: 5707437
    Abstract: Titanium dioxide pigment particles with treatment of an organosilicon compound and boric acid and/or boron oxide is disclosed. The product has a greater resistance to becoming discolored upon exposure to ultraviolet light when incorporated in polymers, particularly polyolefins such as polyethylene.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: January 13, 1998
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Philipp Martin Niedenzu, John Darrel Walker, Laura Faye McClure
  • Patent number: 5690728
    Abstract: A structured composite pigment composed of TiO.sub.2, calcined clay and polyaluminum chloride (PAC). A novel process is disclosed for producing an aggregated composite premium pigment having superior optical, physical and dispersion characteristics for papermaking applications. The aggregated pigment is produced by chemically aggregating a mixture containing TiO.sub.2 and calcined clay with polyaluminum chloride of a basicity of 10-85% in alkaline conditions of pH 8.5-10.5.
    Type: Grant
    Filed: January 2, 1996
    Date of Patent: November 25, 1997
    Assignee: Nord Kaolin Company
    Inventor: Sathanjheri A. Ravishankar
  • Patent number: 5690860
    Abstract: The invention relates to a particulate silica or particulate titania which is treated with a cyclic polysiloxane having the formula ##STR1## in which Me represents a methyl radical and R is an alkyl group having 2 to 12 carbon atoms, The treated particles can be uniformly dispersed in a non-polar organic medium to provide a system having greater stability than similar prior art dispersions,
    Type: Grant
    Filed: December 4, 1995
    Date of Patent: November 25, 1997
    Assignee: Dow Corning Corporation
    Inventor: Gary Edward LeGrow
  • Patent number: 5688315
    Abstract: Described is a process for separating a mixture of finely divided minerals into constituents thereof. In particular, the invention relates to a procedure for effecting such separation by a novel selective flocculation technique wherein a dispersed aqueous pulp containing the mixture of minerals is preconditioned for selective flocculation with an anionic polymer by addition of both a fatty acid such as oleic acid and source of polyvalent cation such as calcium chloride. The fatty acid and cation of the salt selectively coat the component of the mixture that is subsequently flocculated with the anionic polymer. A polyacrylate salt dispersant is preferably used in the process. The invention is especially adapted to the separation of colored titaniferous impurities from kaolin clay in which case both a white purified kaolin product and a strongly flocculated dun-colored titania/kaolin mixture are recovered and then dispersed producing a material useful as a paper coating pigment.
    Type: Grant
    Filed: July 31, 1996
    Date of Patent: November 18, 1997
    Assignee: Engelhard Corporation
    Inventors: Sanjay Behl, Mitchell J. Willis, Raymond H. Young
  • Patent number: 5688314
    Abstract: A pearl pigment which is excellent in discoloration resistance and in affinity (dispersibility) with resins, a production method for the same, and a resin composition, paint and ink into which the above pearl pigment is incorporated. The pearl pigment comprises a flake substrate, titanium oxide coated on the surface thereof, and a phosphoric acid metal compound, or a phosphoric acid metal compound and a metal oxide coated on the surface of particles coated with titanium oxide.
    Type: Grant
    Filed: August 2, 1996
    Date of Patent: November 18, 1997
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Atuko Nishimagi, Masahiko Yazawai, Katuhisa Nitta
  • Patent number: 5653794
    Abstract: The present invention provides a process for the production of hydrophobic inorganic oxide products which comprises reacting the inorganic oxide particles with organohalosilanes, preferably organochlorosilanes, to produce hydrophobic organosilane coated inorganic oxides. It is preferred that the organohalosilane compounds be reacted with the inorganic oxide particles in an aqueous slurry. The inorganic oxide pigments prepared by the processes of this invention have essentially quantitative retention of the organosilanes and contain no adsorbed aldehydes on their surface. The by-products produced in the preferred embodiments of the invention are innocuous salts, which are environmentally safe and readily disposable.
    Type: Grant
    Filed: December 1, 1995
    Date of Patent: August 5, 1997
    Assignee: SCM Chemicals, Inc.
    Inventors: Leon Weber, Robert J. Kostelnik, Charles Wheddon
  • Patent number: 5650003
    Abstract: A pigment composition containing titanium dioxide (TiO.sub.2) and calcined clay in a weight ratio of between about 30:70 and 70:30, preferably between about 35:65 and 45:55 that is substantially free of a functional microgel component has advantages over a similar pigment containing a functional microgel. The pigment composition contains an amount of epichlorohydrin dimethylamine condensate that is sufficient to cationize the pigment, and lacks a microgel component. It is liquid when agitated. Preferably the composition has a solids content greater than about 55%, and most preferably between about 59% and about 61%.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: July 22, 1997
    Assignee: Nord Naolin Company
    Inventors: Jerry Leon Curtis, Lester William House
  • Patent number: 5584394
    Abstract: Described is a process for separating a mixture of finely divided minerals into constituents thereof. In particular, the invention relates to a procedure for effecting such separation by a novel selective flocculation technique wherein a dispersed aqueous pulp containing the mixture of minerals is preconditioned for selective flocculation with an anionic polymer by addition of both a fatty acid such as oleic acid and source of polyvalent cation such as calcium chloride. The fatty acid and cation of the salt selectively coat the component of the mixture that is subsequently flocculated with the anionic polymer. A polyacrylate salt dispersant is preferably used in the process. The invention is especially adapted to the separation of colored titaniferous impurities from kaolin clay in which case both a white purified kaolin product and a strongly flocculated dun-colored titania/kaolin mixture are recovered and then dispersed producing a material useful as a paper coating pigment.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: December 17, 1996
    Assignee: Engelhard Corporation
    Inventors: Sanjay Behl, Mitchell J. Willis, Raymond H. Young
  • Patent number: 5578120
    Abstract: A laser beam absorbing resin composition is disclosed which includes 100 parts by weight of a resin, and 1-100 parts by weight of composite particles having an average particle diameter of 0.1-50 .mu.m and each including a particulate, laser beam absorbing inorganic substance, and a colorant physically bonded directly to the inorganic substance and capable of discoloring upon being heated at a temperature of 250.degree. C. or more, the weight ratio of the colorant to the inorganic substance being in the range of 1:99 to 50:50. By irradiating a shaped, hardened body of the above composition with a laser beam, the colorant is thermally decomposed, so that the color of the irradiated surface is changed and becomes discriminative from that of non-irradiated surface.
    Type: Grant
    Filed: February 15, 1996
    Date of Patent: November 26, 1996
    Assignee: Somar Corporation
    Inventors: Jun Takahashi, Masaaki Toyoda, Akira Yasuda, Hideo Ochi
  • Patent number: 5562990
    Abstract: Organosilicon treatment of TiO.sub.2 particles coated with alumina or alumina-silica having a fluoride compound or fluoride ions associated with them is disclosed to improve properties such as photostability and humidity resistance when incorporated in powder coatings and/or plastics.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: October 8, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Patricia A. Tooley, Philipp M. Niedenzu, Austin H. Reid, Jr.
  • Patent number: 5501732
    Abstract: Disclosed is an improved process for preparing a silanized TiO.sub.2 pigment by media milling.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: March 26, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Philipp M. Niedenzu, Scott M. Herkimer, Ronald L. Chaney
  • Patent number: 5468289
    Abstract: The present invention relates to surface-modified pigments based on platelet-like substrates which, for improving the settling and redispersion behavior, have been recoated with a mixture comprising two metal oxides selected from the group consisting of silica, alumina and zirconium dioxide.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: November 21, 1995
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Gerhard Herget, Margarete Herbski, Karl Osterried
  • Patent number: 5454864
    Abstract: The present invention resides in a layered composite pigment comprising a first pigment particle having a charge of one sign and a second pigment particle having a charge of opposite sign to said one sign. The first pigment particle is an inorganic pigment particle. The first inorganic pigment particle has adsorbed on its surface an organic polymeric dispersant. The dispersant is selected from the group consisting of (a) an anionic or cationic polyelectrolyte dispersant; (b) a cationic synthetic latex having dispersant functionality; and (c) a cationic water-soluble binder having dispersant functionality. The dispersant is adsorbed onto the surface of the inorganic pigment particle in an amount effective to disperse the inorganic particle in an aqueous medium. The second pigment particle is selected from the group consisting of (a') an anionic or cationic synthetic latex particle or swollen binder particle which said swollen binder particle has a particle size greater than 0.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: October 3, 1995
    Inventor: Michael Whalen-Shaw
  • Patent number: 5389140
    Abstract: An electrodeposition paint composition which contains a titanium oxide pigment coated with 1 to 10% by weight of an zinc compound in terms of metal zinc based on the titanium oxide. It is possible by use of the composition to form a coating film excellent in corrosion resistance without using an anticorrosive pigment having a problem on measures against environmental pollution.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: February 14, 1995
    Assignee: Kansai Paint Co., Ltd.
    Inventors: Yoshio Yasuoka, Masafumi Kume, Hidehiko Haneishi
  • Patent number: 5344487
    Abstract: Composite pigments and processes for making the same, useful as partial or total replacement for pigments conventionally employed in paper, paper coatings, paint, ink, and in rubber, are disclosed. The composite pigments comprise one or more synthetic or natural core particles having adsorbed on the surface thereof a polymeric dispersant having a positive or negative charge, and one or more natural or synthetic co-particles having adsorbed on the surface thereof a polymeric dispersant having a positive or negative charge opposite the charge of the core particles. The composite pigments provide improved optical and other properties.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: September 6, 1994
    Inventor: Michael Whalen-Shaw
  • Patent number: 5340393
    Abstract: An improved process for preparing non-agglomerated water insoluble inorganic particles having a dense amorphous silica coating by using a dispersion aid.
    Type: Grant
    Filed: October 12, 1993
    Date of Patent: August 23, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Howard W. Jacobson
  • Patent number: 5338354
    Abstract: A new process for preparing a composite pigment from titanium dioxide and calcium sulphate is provided in which the calcium sulphate is milled to a particle size less than 10 microns, mixed with titanium dioxide and the mixed particulates are coated with an oxide or hydrous oxide of a metal or silicon. The process can particularly be employed in conjunction with a sulphate-process titanium dioxide plant in which by-product sulphuric acid is converted to gypsum. The composite pigment shows improved optical properties in comparison to a mixture of titanium dioxide and gypsum.
    Type: Grant
    Filed: June 23, 1993
    Date of Patent: August 16, 1994
    Assignee: Tioxide Group Services Limited
    Inventors: Iain A. Melville, Robert P. Rauch, deceased
  • Patent number: 5336477
    Abstract: There is provided a composite oxide represented by the formulaiR.sub.2 O.jAl.sub.2 O.sub.3.kTiO.sub.2.mSiO.sub.2.nH.sub.2 Owherein R denotes an alkali metal, i is 0.3 to 1, k is 0 to 0.9, j+k=1, m is 7 to 70 and n is 0.2 to 0.4, said composite oxide being amorphous, and its cumulative specific pore volume of pores having a pore radius of 10.sup.4 A or less being 2.0 to 3.0 cc/g. This composite oxide can be produced by a process which comprises a first reaction step of adding an acid aqueous solution capable of forming a silicate by reaction with an alkali silicate to 7 to 10% by weight, calculated as silica, of an alkali silicate aqueous solution in the presence of a salt at 10 to 45.degree. C. such that a neutralization ratio becomes 20 to 40%, and a second reaction step of heating the reaction solution obtained in the above reaction at temperature of 90.degree. C.
    Type: Grant
    Filed: May 26, 1993
    Date of Patent: August 9, 1994
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Yoshiaki Koga, Genji Taga
  • Patent number: 5320782
    Abstract: Acicular or platy titanium suboxides, expressed by the general formula, TiOx where x is a positive real number less than 2, have a geometric anisotropy as an aspect ratio in the acicular or platy form of 3 or more, a higher specific surface area and a greater geometric anisotropy even in comparison on the basis of the same degree of reduction, and are capable of retaining their native configurations during the reduction. The resin mediums incorporated with the acicular or platy titanium suboxides have good electric properties, and a higher mechanical strength.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: June 14, 1994
    Assignee: Ishihara Sangyo Kaisha, Ltd.
    Inventors: Haruo Okuda, Toshinobu Yamaguchi, Hideo Takahashi
  • Patent number: 5312484
    Abstract: Composite pigment products containing from 4.5% up to 50%, by weight, of particulate titanium dioxide in which particles of the latter and other particulate pigmentary, subpigmentary and nonpigmentary components are cemented intrinsically with the aid of in-situ synthesized complex microgels.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: May 17, 1994
    Assignee: Industrial Progress, Inc.
    Inventor: Adam F. Kaliski
  • Patent number: 5269840
    Abstract: Colorant clusters comprising an aggregation of a plurality of grains of sol-derived material and colorant. The clusters are particularly useful as pigments in liquid compositions, e.g., paints and inks, for forming coatings that are retroreflective immediately upon drying. Also, a process for preparing such colorant clusters comprising admixing colorant in a binder sol to yield a pigment sol and then removing liquid medium from the pigment sol to yield the clusters. Also, a coating composition comprising retroreflective elements, a vehicle, and the aforementioned colorant clusters. After application of the composition to a substrate, the resultant coating is immediately retroreflective upon drying.
    Type: Grant
    Filed: February 4, 1992
    Date of Patent: December 14, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Geoffrey P. Morris, Chester A. Bacon, Jr., Wallace K. Bingham
  • Patent number: 5266107
    Abstract: A pearlescent pigment comprising a platelet-shaped substrate coated with titanium dioxide, an oxide of copper, and optionally oxides of aluminum, and/or zinc, whereby the pigment is silver-gray.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: November 30, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventor: Paul R. Hoffman
  • Patent number: 5262142
    Abstract: There is provided a composite oxide represented by the formulaiR.sub.2 O.jAl.sub.2 O.sub.3.kTiO.sub.2.mSiO.sub.2.nH.sub.2 Owherein R denotes an alkali metal, i is 0.3 to 1, k is 0 to 0.9, j+k=1, m is 7 to 70 and n is 0.2 to 0.4,said composite oxide being amorphous, and its cumulative specific pore volume of pores having a pore radius of 10.sup.4 A or less being 2.0 to 3.0 cc/g. This composite oxide can be produced by a process which comprises a first reaction step of adding an acid aqueous solution capable of forming a silicate by reaction with an alkali silicate to 7 to 10% by weight, calculated as silica, of an alkali silicate aqueous solution in the presence of a salt at 10.degree. to 45.degree. C. such that a neutralization ratio becomes 20 to 40%, and a second reaction step of heating the reaction solution obtained in the above reaction at a temperature of 90.degree. C.
    Type: Grant
    Filed: July 31, 1992
    Date of Patent: November 16, 1993
    Assignee: Tokuyama Soda Kabushiki Kaisha
    Inventors: Yoshiaki Koga, Genji Taga
  • Patent number: 5258071
    Abstract: Vitreous filler material for incorporation into a polymerizable matrix, including a filler material which is vitreous; a polymerization catalyst; and a fixing agent which is applied to at least a part of the surface of the filler material and which affixes the polymerization catalyst to the surface of the filler material. Fixing catalyst to the surface of the filler material prior to its being contacted with the polymerizable matrix material facilitates good distribution of the catalyst within the polymerizable matrix material, and advantageously allows rapid catalytic action and a reduction in the amount of catalyst required.
    Type: Grant
    Filed: June 16, 1992
    Date of Patent: November 2, 1993
    Assignee: Glaverbel
    Inventor: Pierre LaRoche
  • Patent number: 5236494
    Abstract: A solid painting material comprises an alkali metal or ammonium salt of an aliphatic carboxylic acid having 8 to 36 carbon atoms as a gel-forming agent, 1 to 70% by weight of a coloring agent, 1 to 20% by weight of hydrophobic silica and 0.1 to 30% by weight of a water-soluble resin, wherein the amounts are based on the total weight of the solid painting material. The solid painting material has good painting properties and fixing ability as well as painting properties in overlap-painting. Further, if the solid painting material comprises a white pigment as a coloring agent, it can be used as a correcting agent as well.
    Type: Grant
    Filed: September 13, 1991
    Date of Patent: August 17, 1993
    Assignees: Buncho Corporation, Kotobuki & Co., Ltd.
    Inventor: Yoshimi Kano
  • Patent number: 5171631
    Abstract: A coating composition and method of coating for producing a coating containing at least 21-22% by volume titanium dioxide pigment for developing hiding on a suitable substrate, the coating composition having a pigment volume concentration (PVC) of up to a critical pigment volume concentration (CPVC), preferably a PVC of from about 25% to about 50-60% and more preferably from about 25% to about 45%, and a pigment system including an optional filler and a prime pigment comprising about 70-98% by volume titanium dioxide (TiO.sub.2), preferably a rutile form having a median particle size of about 0.2 microns, and about 2-30% by volume of an aluminum trihydrate (ATH) spacer/extender pigment having a similar median particle size and particle size distribution, preferably substantially the same as for the TiO.sub.2 pigment.
    Type: Grant
    Filed: July 19, 1990
    Date of Patent: December 15, 1992
    Assignee: Aluminum Company of America
    Inventor: Adrian S. Adkins
  • Patent number: 5152835
    Abstract: Novel titania-calcined kaolin composite pigments wherein structuring and adhesion of titania and calcined kaolin particles is achieved by use of a cationic polyelectrolyte. Methods for compositing titania and calcined kaolin pigments which feature the presence of at least one polyanionic dispersant (such as sodium polyacrylate, sodium silicate, sodium condensed phosphate or mixtures thereof) in the pigment slurry into which cationic polyelectrolyte is introduced and the use of strongly alkaline pH (e.g., above 9).
    Type: Grant
    Filed: May 8, 1991
    Date of Patent: October 6, 1992
    Assignee: Engelhard Corporation
    Inventor: Saad Nemeh
  • Patent number: 5137574
    Abstract: A method of producing a high opacifying kaolin pigment by separating from one or more iron-stained titania-containing crude kaolins having a titania content of from about 1 to 2 weight percent, one or more titania-enriched kaolin fractions which contain the titania in an amount of above 2 weight percent; subjecting the fraction(s) to media grinding; dewatering and drying the media ground fraction(s); blending the fraction(s) with a fine particle size unground kaolin having a titania content less than 2%, in proportions to provide a calciner feed having at least 2% titania; and calcining the feed at a temperature in the range of 1500.degree. to 2200.degree. F.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: August 11, 1992
    Assignee: ECC America Inc.
    Inventors: Paul Suitch, Ralph E. Turner, Jr., Dona L. Archer, William B. Smith
  • Patent number: 5116411
    Abstract: The addition of an organophosphato-titanate and an organophosphato-zirconate to printing ink improves the adhesivity of the ink to a variety of substrates. A concentrate of the two organo-metallic components may be added to a conventional ink or added to the ink formulation during the ink's initial preparation. In addition to improving adhesivity, the additives reduce drying time, permit more rapid processing, and minimize the need for solvent diluents.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: May 26, 1992
    Assignee: Topez Company
    Inventors: Michael W. O'Neill, Gerald Sugerman
  • Patent number: 5078793
    Abstract: Composite white pigments composed of titanium dioxide (TiO.sub.2) and kaolin are prepared by subjecting kaolin slurry to spray drying with injected gas to promote droplet fluffing and fragmentation. The slurry contains a hydrocolloid suspending agent and a cationic reagent for making the kaolin particles cationic. The frangible dry material thus produced can be blended with TiO.sub.2 particles to produce an extended TiO.sub.2 pigment.
    Type: Grant
    Filed: January 26, 1990
    Date of Patent: January 7, 1992
    Assignee: Pacemaker, Ltd.
    Inventor: Dennis W. Caton
  • Patent number: 5047375
    Abstract: A method of producing a high opacity paper filler pigment which comprises subjecting an iron-stained titania-containing kaolin to beneficiation by froth flotation or high intensity magnetic separation; recovering the froth or magnet rejects, dewatering and drying the rejects to produce a kaolin enriched in titania, and calcining the same at a temperature in the range of about 1500.degree. to about 2200.degree. F.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: September 10, 1991
    Assignee: ECC America Inc.
    Inventors: Weyman Dunaway, Ralph E. Turner
  • Patent number: 5041162
    Abstract: An improved process is provided for preparing durable titanium dioxide pigments having discrete layers of silica and alumina deposited thereon. The improved process includes careful control of the operating conditions of pH end temperature of a slurry of titanium dioxide pigment during the addition of the coating materials to the slurry and the deposition of the silica and alumina onto the pigment.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: August 20, 1991
    Assignee: Kerr-McGee Chemical Corporation
    Inventor: John R. Brand
  • Patent number: 5035748
    Abstract: An inorganic pigment comprising a content of at least 0.1% by weight and at most 5% by weight of one or more polyorganosiloxanes, wherein the polyorganosiloxanes have viscosities of 10 to 100,000 mPa.s and a relative molecular weight of 500 to 500,000, have no reactive or crosslinking groups, contain at least one C.sub.9 -C.sub.25 Si-alkyl and/or one C.sub.9 -C.sub.25 Si-aryl group per molecule, the total content of these groups in the polyorganosiloxane being 7-70% by weight and the other organic radicals contained in the polyorganosiloxane having 1 to 8 carbon atoms. Such pigments can be used in lacquers, emulsion paints, plastics, toners, magnetic recording materials, building materials and enamels.
    Type: Grant
    Filed: November 22, 1989
    Date of Patent: July 30, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilfried Burow, Jurgen Kischkewitz, Ottfried Schlak
  • Patent number: 4935063
    Abstract: Stabilizing inorganic fillers or pigments having simultaneous reinforcing effect and stabilizing effect on organic polymers are obtained by a process comprising the following stages:(a) bringing the inorganic filler or pigment into contact with a solution, in an inert organic solvent, of a sterically hindered amine comprising one or more alkoxysilane groups in its molecule;(b) maintaining the obtained mixture at higher than ambient temperature (20.degree.-25.degree. C.) for a period of at least 0.5 hours;(c) removing the solvent, treating at a temperature of 120.degree.-200.degree. C. and recovering the stabilizing filler or pigment obtained.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: June 19, 1990
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Silvestro Costanzi, Omero Zavattini, deceased, Ugo Bersellini, Damiano Gussoni
  • Patent number: 4851048
    Abstract: A structured kaolinitic pigment having improved physical and optical characteristics when incorporated as a filler in paper. The pigment is also useful in paper coating applications. The pigment consists of porous aggregates of kaolin particles which are chemically bonded together. The pigment may be produced by chemically reacting a particulate kaolin with a metal chloride, such as silicon tetrachloride. The process is conducted under conditions such that the kaolinite structure is not impaired.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: July 25, 1989
    Assignee: E.C.C. America Inc.
    Inventors: J. Philip E. Jones, Jorge E. Salinas, Keryn N. Geho, Weyman H. Dunaway, Rasik H. Raythatha
  • Patent number: 4810305
    Abstract: A modified hydrophobic colored or magnetic pigment or filler comprising a hydrophobic pigment or filler containing from 0.05 to 10% by weight, based on the weight of the pigment or filler, of an organopolysiloxane corresponding to the formula ##STR1## wherein x=0 to 500,y=5 to 500,z=5 to 500,R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 denote, independently of one another, a saturated and/or unsaturated, unbranched or branched alkyl group haviang 1 to 4 carbon atoms and/or an aryl group having 6 to 9 carbon atoms, said aryl group being unsubstituted or alkyl substituted,R.sup.7 is a straight chained or branched alkyl group having 6 to 18 carbon atoms and R.sup.7 and H each amount to at least 3% of the number of groups attached to Si.
    Type: Grant
    Filed: August 4, 1987
    Date of Patent: March 7, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf M. Braun, Peter Panek, Horst Bornefeld, Dieter Rade, Wolfgang Ritter
  • Patent number: 4781761
    Abstract: Pigments are disclosed which consist essentially of rutile TiO.sub.2 particles bearing coatings comprising SiO.sub.2 and B.sub.2 O.sub.3.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: November 1, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Howard W. Jacobson