Aluminum Compound Or Silicon Containing Patents (Class 106/442)
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Patent number: 5667892Abstract: Multicolored flakes with two faces, having a thickness between approximately 60 .mu.m and approximately 200 .mu.m, consist in a film of uniform color of polymer, copolymer or terpolymer, or a mixture thereof, having on at least part of one face only a decorative coating different from the uniform color.Type: GrantFiled: April 18, 1995Date of Patent: September 16, 1997Assignee: Sarl Quadra IndustriesInventor: Robert Marillier
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Patent number: 5662738Abstract: Luster pigments useful for coloring paints, printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations are based on multiply coated plateletlike metallic substrates comprisingA) a first, colorless or selectively absorbing layer of metal oxide,B) a second, nonselectively absorbing layer of carbon, metal and/or metal oxide, andC) if desired a third, colorless or selectively absorbing layer of metal oxide.Type: GrantFiled: July 22, 1994Date of Patent: September 2, 1997Assignee: BASF AktiengesellschaftInventors: Raimund Schmid, Norbert Mronga
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Patent number: 5653794Abstract: 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: GrantFiled: December 1, 1995Date of Patent: August 5, 1997Assignee: SCM Chemicals, Inc.Inventors: Leon Weber, Robert J. Kostelnik, Charles Wheddon
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Patent number: 5650002Abstract: A TiO.sub.2 pigment particle having a surface coating of inorganic particles or mineral particles exhibiting improved light scattering efficiency of TiO.sub.2 at a moderate to high pigment volume concentration (PVC) and a low oil absorption when incorporated in coatings applications is disclosed, and methods of accomplishing the same.Type: GrantFiled: November 13, 1995Date of Patent: July 22, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventor: John Davis Bolt
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Patent number: 5629362Abstract: Photon-diffusive coating compositions contain a binder and a mineral containing at least about 65%, preferably at least about 75%, and most preferably at least about 85% to 90% silica, of which at least about 60%, preferably at least about 75% to 85% is in the crystal form of cristobalite, which has been reacted with sodium hydroxide. In typical embodiments, ground Klannerite.RTM. is reacted with sodium hydroxide in an aqueous slurry by the application of heat to just below the boiling point until the pH falls to below 12, and then a latex binder is added. Preferred binders comprise a mixture of polysaccharide resin and a latex binder; the polysaccharide resin is added, the mixture is neutralized somewhat, and then the latex binder is added. The viscosity of the final composition may be adjusted by adding water. Cured coatings exhibit good spectral reflectance and are useful in a variety of applications such as coating furnace interiors.Type: GrantFiled: May 31, 1995Date of Patent: May 13, 1997Assignee: Heatshield Technologies Inc.Inventor: Paul R. Arena
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Patent number: 5595592Abstract: An improved dye composition for use in coating tablets and the like is constituted by a stable, aqueous suspension containing a water-soluble, nontoxic dye, an opacifying agent which may be titanium dioxide or iron oxide an immobilizing agent for immobilizing the dye and preventing it from migrating when applied to a tablet or the like, the immobilizing agent being constituted by a nontoxic metal salt present in an amount of from approximately 0.1 to 10 equivalents of metal per mole of dye, and water. The suspension may also contain a film-forming, water-soluble or water-dispersible edible polymer and a plasticizer. These compositions are used in lieu of lake compositions to produce tablets and the like with uniform, non-mottled coatings.Type: GrantFiled: November 28, 1994Date of Patent: January 21, 1997Assignee: Warner-Jenkinson Company, Inc.Inventors: Charles A. Signorino, Harry Meggos
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Patent number: 5562990Abstract: 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: GrantFiled: February 23, 1995Date of Patent: October 8, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Patricia A. Tooley, Philipp M. Niedenzu, Austin H. Reid, Jr.
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Patent number: 5554216Abstract: A coated TiO.sub.2 pigment is disclosed with coatings of porous alumina and dense alumina, such dense alumina being formed in the presence of soluble molybdate.Type: GrantFiled: December 15, 1994Date of Patent: September 10, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Andrejs Baidins, Michael P. Diebold
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Patent number: 5540769Abstract: Platelet-shaped colored pigments containing titanium dioxide, one or more suboxides of titanium and an oxide or oxides of one or more metals other than titanium or non-metals and a process for the preparation thereof is disclosed.Type: GrantFiled: September 23, 1994Date of Patent: July 30, 1996Assignee: Merck Patent Gesellschaft Mit Beschrankter HaftungInventors: Klaus-Dieter Franz, Klaus Ambrosius, Stefan Wilhelm, Katsuhisa Nitta
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Patent number: 5536448Abstract: Dendrite or asteroidal titanium dioxide micro-particles having a length of 0.2 to 0.5 .mu.m, a thickness of 0.05 to 0.1 .mu.m, and a specific surface area of 20 to 130 m.sup.2 /gram, are produced by treating hydrated titanium oxide particles with an alkali, mixing instantaneously the resulting reaction product with an amount of hydrochloric acid in a ratio of 1 to 4 mols of hydrochloric acid to one mol of the titanium oxide in the reaction product to effect a reaction, then aging under heat at 85.degree. C. or higher, and then drying or, if necessary, firing after the drying, and subsequently may be coated with at least one from oxides and hydrated oxides of elements selected from aluminum, silicon, titanium, zirconium, tin and antimony to improve the dispersibility and resistance to light of the particles, or may be coated with tin oxide containing antimony or indium oxide containing tin to make the particles electroconductive.Type: GrantFiled: October 20, 1994Date of Patent: July 16, 1996Assignee: Ishihara Sangyo Kaisha, Ltd.Inventors: Hideo Takahashi, Akihito Sakai, Masakazu Hattori
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Patent number: 5501731Abstract: Luster pigments comprising coated, plateletlike, silicatic substrates wherein the coating comprises a layer consisting essentially of carbon and aluminum oxide, chromium oxide, cerium oxide, zirconium oxide, antimony oxide or mixtures thereof, are obtainable by applying carbon-containing compounds of the metals aluminum, chromium, cerium, zirconium, antimony or mixtures thereof with or without further carbon-containing compounds of the molecular formula (CH.sub.2 O).sub.n, where n is from 1 to 6 for one monomeric unit, to the substrate particles and then thermally decomposing the carbon-containing compounds on the surface of the substrate particles under oxygen-excluding conditions.Type: GrantFiled: June 27, 1994Date of Patent: March 26, 1996Assignee: BASF AktiengesellschaftInventors: Raimund Schmid, Norbert Mronga, Werner Ostertag, Helmut Schmidt
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Patent number: 5468289Abstract: 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: GrantFiled: September 30, 1994Date of Patent: November 21, 1995Assignee: Merck Patent Gesellschaft Mit Beschrankter HaftungInventors: Gerhard Herget, Margarete Herbski, Karl Osterried
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Patent number: 5458680Abstract: An improved process for producing a aggregated composite pigment having desired physical and optical characteristics when used as a coating, filler or pigment in paper. The aggregated pigment is produced by contacting a substantially dry fine particle size mixture of kaolin and one or more additional feed minerals with a previously hydrolyzed organic silicon compound, such as hydrolyzed tetraethoxysilane, and then recovering the aggregated composite pigment.Type: GrantFiled: March 25, 1994Date of Patent: October 17, 1995Assignee: ECC International, Inc.Inventors: Dickey S. Shurling, Jr., Vincent F. Newberry
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Patent number: 5456749Abstract: Disclosed is an anti-discoloring pearly luster pigment of white titanium dioxide-coated mica grains wherein; (a) the surfaces of the titanium dioxide and/or titanium oxide hydrate coated mica particles are coated with from 1 to 7 parts by weight, to 100 parts by weight of the titanium dioxide and/or titanium oxide hydrate coated mica particles, of a silicon oxide and/or silicon oxide hydrate; (b) the surfaces of the coated grains are further coated with from 0.5 to 5 parts by weight, to 100 parts by weight of the mica titanium dioxide and/or titanium oxide hydrate coated particles, of an aluminium oxide and/or aluminum oxide hydrate; and (c) the surfaces of the coated particles are still further coated with from 0.5 to 3 parts by weight, to 100 parts by weight of the titanium dioxide and/or titanium oxide hydrate coated mica particles, of a zinc oxide and/or zinc oxide hydrate.Type: GrantFiled: March 1, 1994Date of Patent: October 10, 1995Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Kazuhisa Iwasa, Katsuhisa Nitta, Tamio Noguchi
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Patent number: 5454864Abstract: 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: GrantFiled: June 17, 1994Date of Patent: October 3, 1995Inventor: Michael Whalen-Shaw
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Patent number: 5447561Abstract: Herein is disclosed a pigment-dispersed resin composition comprising (a) a surface modified pigment in respect of which a surface modifying mixture consisting of a titanium oligomer and an organic acid ester is coated uniformly on the surface of the pigment particles and (b) a resin, usable, e.g., as an ingredient of a paint or a printing ink.Type: GrantFiled: May 4, 1992Date of Patent: September 5, 1995Assignee: Kenrich Petrochemicals, Inc.Inventors: Naoki Chiba, Koichiro Sagawa, Takashi Zama
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Patent number: 5441564Abstract: The invention relates to a pigment mixture containing a component A composed of at least one platelet-shaped interference pigment and a pigment B composed of at least one platelet-shaped color pigment.Type: GrantFiled: December 2, 1993Date of Patent: August 15, 1995Assignee: Merck Patent Gesellschaft mit Beschrankter HaftungInventor: Reiner Vogt
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Patent number: 5423912Abstract: A titanium dioxide- or iron oxide-coated mica pearlescent pigment having a coating which contains a combination of hydrated cerium and aluminum oxides has enhanced weatherstability.Type: GrantFiled: October 21, 1993Date of Patent: June 13, 1995Assignee: The Mearl CorporationInventors: William J. Sullivan, Deborah Cacace
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Patent number: 5389140Abstract: 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: GrantFiled: October 28, 1993Date of Patent: February 14, 1995Assignee: Kansai Paint Co., Ltd.Inventors: Yoshio Yasuoka, Masafumi Kume, Hidehiko Haneishi
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Patent number: 5385753Abstract: Coated particles having properties such as to make them suitable as replacements for titanium dioxide particles can be obtained by reacting a titanium or zirconium halide, ether, or ester with zeolite hydrate particles so as to coat the zeolite particles with titania or zirconia. The reaction is preferably conducted between a titanium compound, such as titanium tetrachloride, and the zeolite in an inert medium, such as anhydrous or substantially anhydrous air or a hydrocarbon.Type: GrantFiled: August 30, 1993Date of Patent: January 31, 1995Assignee: Albemarle CorporationInventors: Patrick C. Hu, Richard I. Leavitt
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Patent number: 5380361Abstract: A hydrophobic filler material for alkaline paper is disclosed. The filler material comprises finely divided particles of an inorganic material, a majority of particles having a surface all of which is substantially modified with a water soluble C.sub.12 -C.sub.22 fatty acid salt and a metal ion in an amount at least effective to complex all of the fatty acid salt present. An alkaline paper is disclosed. The alkaline paper comprises a hydrophobic filler material comprising finely divided inorganic material, a majority of particles having substantially all of their surface being modified with a water soluble C.sub.12 -C.sub.22 fatty acid salt. A method for improving sizing of alkaline paper is disclosed, comprising preparing a filler material and adding the same to cellulose fiber. The filler material is prepared by selecting finely divided particles of an inorganic material and substantially modifying all of the surface of a majority of the particles with a C.sub.12 -C.sub.Type: GrantFiled: March 12, 1993Date of Patent: January 10, 1995Assignee: Minerals Technologies, Inc.Inventor: Robert A. Gill
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Patent number: 5346546Abstract: Aggregate-TiO.sub.2 pigment products comprising in each 100 parts, by weight, at least 50 parts, by weight, particulate TiO.sub.2 materials bound intrinsically with other pigmentary, subpigmentary and nonpigmentary components with the aid of inorganic and/or organic cements/adhesives.Type: GrantFiled: March 23, 1992Date of Patent: September 13, 1994Assignee: Industrial Progress, Inc.Inventor: Adam F. Kaliski
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Patent number: 5344487Abstract: 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: GrantFiled: February 12, 1992Date of Patent: September 6, 1994Inventor: Michael Whalen-Shaw
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Patent number: 5344489Abstract: A method of making synthetic color pigments comprises synthesizing monodispersed colloidal core particles by precipitation from a solution and applying dye material to the core particles either by adsorption directly into the core particles or by adsorption or incorporation into alumina fixation shells at the surfaces of the core particles. Additional functional shells may be applied to the dyed core particles for various reasons. The pigments are useful for the coloration of various media such as printing inks and paint compositions.Type: GrantFiled: November 15, 1991Date of Patent: September 6, 1994Assignee: Manfred R. KuehnleInventors: Egon Matijevic, Wan P. Hsu, Manfred R. Kuehnle
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Patent number: 5342485Abstract: A process for preparing an ultra-white alumina trihydrate having a G.E. brightness of at least about 98%. The product is alumina trihydrate that has been rehydrated with coprecipitation, and the crystal phase of the product is primarily gibbsite in thin platelet form having a ratio of thickness to diameter of about 0.2 to about 0.3. The product is prepared by flash activation of a white initial alumina trihydrate, addition of the activated material to a purified sodium aluminate liquor having an alumina to caustic ratio of about 0.5, and rehydrating and precipitating the alumina at ambient temperature under agitation for about 48 hours, followed by washing and drying of the resulting precipitate. The material is especially useful as a filler or coating in papermaking, and it can be substituted for a portion of titanium dioxide pigment in the ratio of 1:1, and can be combined with titanium dioxide as a pigment mixture, either in slurry form or in dry form.Type: GrantFiled: August 5, 1992Date of Patent: August 30, 1994Assignee: Reynolds Metals CompanyInventor: Bernard F. Armbrust, Jr.
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Patent number: 5340393Abstract: An improved process for preparing non-agglomerated water insoluble inorganic particles having a dense amorphous silica coating by using a dispersion aid.Type: GrantFiled: October 12, 1993Date of Patent: August 23, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventor: Howard W. Jacobson
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Patent number: 5338354Abstract: 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: GrantFiled: June 23, 1993Date of Patent: August 16, 1994Assignee: Tioxide Group Services LimitedInventors: Iain A. Melville, Robert P. Rauch, deceased
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Patent number: 5332433Abstract: A titanium dioxide production method, a novel titanium dioxide product produced by the inventive titanium dioxide production method, a method for producing a plastic product using the novel titanium dioxide product, and a novel plastic product formed by the inventive plastic product production method. The inventive titanium dioxide production method comprises the steps of: (a) forming a mixture comprising a titanium dioxide material in a liquid medium; (b) wet milling the titanium dioxide material in the liquid medium; (c) after step (b), reducing the pH of the mixture to a value not exceeding 4.0; (d) after step (c), adding an effective amount of a base to the mixture to cause the titanium dioxide material to flocculate; (e) removing the flocculated titanium dioxide material from the mixture; and (f) washing the titanium dioxide material. The titanium dioxide material used in step (a) is an agglomerated titanium dioxide material which has been produced by a reaction process.Type: GrantFiled: November 24, 1993Date of Patent: July 26, 1994Assignee: Kerr-McGee Chemical CorporationInventors: Phillip Story, Kelly A. Green, John E. Halko
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Patent number: 5320781Abstract: There is disclosed an electrically conductive pigment containing 20 to 95% by weight of a component A comprising one or more conductive platelet-like pigments and 5 to 80% by weight of a component B comprising one or more conductive needle-shaped or fibrous pigments.Type: GrantFiled: April 16, 1993Date of Patent: June 14, 1994Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventors: Otto Stahlecker, Manfred Thon, Ralf Glausch, Gerhard Pfaff, Manfred Kieser, Wilhelm Gobel
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Patent number: 5318628Abstract: A method of making synthetic color pigments comprises synthesizing monodispersed colloidal core particles by precipitation from a solution and applying dye material to the core particles either by adsorption directly into the core particles or by adsorption or incorporation into alumina fixation shells at the surfaces of the core particles. Additional functional shells may be applied to the dyed core particles for various reasons. The pigments are useful for the coloration of various media such as printing inks and paint compositions.Type: GrantFiled: December 4, 1992Date of Patent: June 7, 1994Assignee: Manfred R. KuehnleInventors: Egon Matijevic, Wan P. Hsu, Manfred R. Kuehnle
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Patent number: 5298066Abstract: An improved process for producing a aggregated kaolin pigment having desired physical and optical characteristics when used as a coating, filler or pigment in paper. The aggregated pigment is produced by contacting a substantially dry fine particle size kaolin with a previously hydrolyzed organic silicon compound, such as hydrolyzed tetraethoxysilane, and then recovering the aggregated kaolin pigment.Type: GrantFiled: February 22, 1993Date of Patent: March 29, 1994Assignee: ECC International Inc.Inventors: Dickey S. Shurling, Jr., Alan J. Brown, E. Wayne Andrews
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Patent number: 5248556Abstract: Whitener pigment particles that offer good hiding power consist of particles having a uniform shape (preferably spherical) and varying only slightly in dimension. The particles consist of an inexpensive, readily manufacturable core material which is surrounded by one or more thin, concentric layers or shells, one of which is titania. The core provides the central mechanical support for the shells. In addition to the titania shell, layers can be added to provide compatibility with the carrier in which the particles are dispersed and promote phase transformation. Also described is a production method and apparatus for generating large quantities of the particles.Type: GrantFiled: November 15, 1991Date of Patent: September 28, 1993Assignee: Manfred R. KuehnleInventors: Egon Matijevic, Peter Hsu, Manfred R. Kuehnle
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Patent number: 5232495Abstract: An improved process for producing a aggregated kaolin pigment having desired physical and optical characteristics when used as a coating, filler or pigment in paper. The aggregated pigment is produced by mixing an aqueous slurry of a fine particle kaolin with a previously hydrolyzed organic silicon compound, such as hydrolyzed tetraethoxysilane, and then spray drying the mixture to form a dry, chemically aggregated kaolin pigment.Type: GrantFiled: May 1, 1992Date of Patent: August 3, 1993Assignee: ECC International Inc.Inventors: Dickey S. Shurling, Jr., Alan J. Brown, E. Wayne Andrews
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Patent number: 5203916Abstract: The present invention provides a pigmentary titanium composite having good durability and excellent optical properties. The inventive composite consists essentially of: a particulate titanium dioxide base; a hydrous zirconium oxide layer deposited on the titanium dioxide base; and a hydrous alumina layer deposited on the hydrous zirconium oxide layer. The alumina layer consists essentially of boehmite alumina and/or pseudoboehmite alumina.The present invention also provides a method for preparing the inventive pigmentary composite. The inventive method comprises the steps of: (a) preparing an aqueous slurry comprising water and a particulate titanium dioxide base; (b) depositing a layer of a hydrous zirconium oxide precipitate on the titanium dioxide base; and (c) depositing a layer of a hydrous alumina precipitate on the layer of hydrous zirconium oxide. The hydrous alumina precipitate consists essentially of boehmite alumina and/or pseudoboehmite alumina.Type: GrantFiled: April 10, 1992Date of Patent: April 20, 1993Assignee: Kerr-McGee Chemical CorporationInventors: Kelly A. Green, Thomas I. Brownbridge
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Patent number: 5171631Abstract: 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: GrantFiled: July 19, 1990Date of Patent: December 15, 1992Assignee: Aluminum Company of AmericaInventor: Adrian S. Adkins
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Patent number: 5152835Abstract: 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: GrantFiled: May 8, 1991Date of Patent: October 6, 1992Assignee: Engelhard CorporationInventor: Saad Nemeh
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Patent number: 5137574Abstract: 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: GrantFiled: November 30, 1990Date of Patent: August 11, 1992Assignee: ECC America Inc.Inventors: Paul Suitch, Ralph E. Turner, Jr., Dona L. Archer, William B. Smith
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Patent number: 5127952Abstract: Novel pigmentary colorants, well adapted for the production of electrostatic developer powders, are comprised of mineral core particulates, at least one mineral oxide and at least one dye, said at least one mineral oxide being deposited onto the surface area of the core particulates, and said at least one dye being absorbed onto the core particulates or onto the at least one mineral oxide and/or being at least partly physically confined within a matrix of the mineral oxide.Type: GrantFiled: May 30, 1990Date of Patent: July 7, 1992Assignee: Rohne-Poulenc ChimieInventors: Jacques Persello, Claude Ceintrey, Michel Sutter
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Patent number: 5114486Abstract: A new process for the production of pigments suitable for use in paper laminates has been developed in which a metal oxide is treated with a water-soluble salt of zinc and a phosphate or phosphoric acid and subsequently with an alkali metal aluminate in such a manner that there is deposited on the metal oxide a coating containing zinc and phosphate ions together with aluminium ions. The pH of the dispersion following the metal oxide is maintained at a value not exceeding 8.0 during precipitation. A particularly useful pigment is produced which has a coating containing zinc ions in an amount of 0.5 to 5% by weight as ZnO, phosphate ions in an amount of 0.2 to 3% as P.sub.2 O.sub.5 and aluminium ions in an amount of 0.5 to 5% expressed as Al.sub.2 O.sub.3 on the weight of TiO.sub.2.Type: GrantFiled: March 26, 1991Date of Patent: May 19, 1992Assignee: Tioxide Group PLCInventors: Maria Demosthenous, Francis Van Meyel
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Patent number: 5112404Abstract: The invention relates to readily dispersible pigment formulations which are stable to flocculation and are used for pigmenting naturally occurring and synthetic materials, preferably paints and printing inks, plastics and lacquers, in particular stoving lacquers. The pigment formulations contain compounds of the general formula (I) ##STR1## in which Q.sup.1, Q.sup.2 and Q.sup.3 each denote --X--A, --OR.sup.1, --SR.sup.1, halogen, --NR.sup.2 R.sup.3 or a radical Q which is built up from up to 15 trivalent groups (Ia) such that in each case one group (Ia) is bonded via W to a free valency of the next group (Ia) or to the triazine ring of (I) and the other free valencies are bonded to --X--A, --O--R.sup.1, halogen or --NR.sup.2 R.sup.3, at least one radical --X--A being present in (I), and A stands for an aromatic system with 2 to 6 rings and at least 9 ring atoms, or stands for a group of 2 to 3 aromatic ring systems, bonded via O, S, CO, SO, SO.sub.2 or C.sub.1 -C.sub.Type: GrantFiled: April 4, 1990Date of Patent: May 12, 1992Assignee: Hoechst AktiengesellschaftInventors: Andreas Sommer, Erwin Dietz, Manfred Urban
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Patent number: 5108508Abstract: Novel rutile mixed phase pigment microgranulates are disclosed which comprise hemispherical particles indented to form toroid-shaped beads. The microgranulates are free-flowing, non-dust forming, and are stable in handling.Type: GrantFiled: September 10, 1990Date of Patent: April 28, 1992Assignee: Bayer AktiengesellschaftInventors: Jakob Rademachers, Hans-Ulrich Hofs, Dieter Rade
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Patent number: 5106419Abstract: Colored pigments having an improved stability in decorative colors, engobes, glazes, and enamels, based on platelet-type substrates coated with metal oxides, in which the coating is free from alkaline earth metal oxides and contains a colored metal oxide or metal hydroxide and at least 10% by weight of aluminum oxide, are outstandingly suitable for pigmenting glazes and enamels.Type: GrantFiled: March 7, 1991Date of Patent: April 21, 1992Assignee: Merck Patent Gesellschaft mit Beschrankter HaftungInventors: Wolfgang Hechler, Karl Osterried, Manfred Weigand
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Patent number: 5078793Abstract: 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: GrantFiled: January 26, 1990Date of Patent: January 7, 1992Assignee: Pacemaker, Ltd.Inventor: Dennis W. Caton
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Patent number: 5068056Abstract: An aqueous dispersion of acicular fine particle size titanium dioxide containing from 20 to 60% by weight solids content and a polycarboxylic dispersant is of outstanding use in the preparation of sun screens. The dispersions are transparent to visible light and absorbant to UV light of broad spectrum. Usually the titanium dioxide has a largest dimension within the range 0.01 to 0.15 micron.The dispersions are produced by milling, preferably in a high speed mill, until the required UV absorbancy is attained.Type: GrantFiled: December 1, 1989Date of Patent: November 26, 1991Assignee: Tioxide Group PLCInventor: Jenifer L. Robb
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Patent number: 5047375Abstract: 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: GrantFiled: December 22, 1988Date of Patent: September 10, 1991Assignee: ECC America Inc.Inventors: Weyman Dunaway, Ralph E. Turner
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Patent number: 5041162Abstract: 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: GrantFiled: August 20, 1990Date of Patent: August 20, 1991Assignee: Kerr-McGee Chemical CorporationInventor: John R. Brand
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Patent number: 5021091Abstract: A hard coating composition comprising an organic silicon compound and inorganic submicron particles such as silica sol and antimony oxide sol is improved in curing properties and shelf stability by blending aluminum perchlorate as the curing catalyst.Type: GrantFiled: January 16, 1990Date of Patent: June 4, 1991Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Mitsuhiko Takarada, Kazuharu Sato, Kenji Yamamoto, Shigeru Mori
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Patent number: 4976787Abstract: A pigment comprises a substrate, a metallic layer formed on at least one surface of the substrate and imparting metallic luster, and a transparent inorganic compound layer formed on surfaces of the substrate and the metallic layer. Thereby, the pigment produces color by light interference of a ray reflected on a surface of the transparent inorganic compound layer and a ray passed through the transparent inorganic compound layer and reflected on a surface of the metallic layer. Thus, the pigment is excellent in coloring power and hiding power, and particularly useful for an automotive finishing paint.Type: GrantFiled: March 14, 1990Date of Patent: December 11, 1990Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hiroshi Ito, Junichi Handa, Yoshio Takagi, Taketoshi Minohara
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Patent number: 4929381Abstract: A novel anion exchange material comprising substantially crystalline inorganic mixed metal hydroxides and mixed metal hydrated oxides exhibiting anion exchange properties at temperatures up to about 150.degree. C. and a method of preparing the same is disclosed. The anion exchanger composition is prepared by coprecipitating hydroxides or hydrated oxides of metal elements such as aluminum and titanium and then drying the mixed metal hydroxides or hydrated oxides.Type: GrantFiled: March 1, 1988Date of Patent: May 29, 1990Assignee: The Dow Chemical CompanyInventor: Howard W. Clark
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Patent number: 4927464Abstract: There is an increasing demand for products which are effective in the absorbancy of UV light but still remain transparent to visible light. Titanium dioxide has been proposed for this use.A new form of titanium dioxide has been developed which is very effective in use and which is acicular in shape and having a ratio of the largest dimension to the shortest within the range 8:1 to 2:1 and wherein the largest dimension is from 0.01 to 0.15 micron and in which the particles have a coating of a hydrous oxide of aluminium and of silicon in a weight ratio of at least 1.5 and not greater than 4.5 expressed as the oxides. The materials are eminently suitable for use in cosmetics and other skin care products.Type: GrantFiled: May 23, 1988Date of Patent: May 22, 1990Assignee: Tioxide Group PLCInventor: Alan G. Cowie