Utilizing Titanium Sulfate As Reactant Patents (Class 423/615)
  • Patent number: 9700895
    Abstract: The invention consists in the use, as a dry grinding aid agent of a mineral matter chosen from among the dolomites, talc, titanium dioxide, alumina, kaolin and calcium carbonate, the function of which is to reduce the specific grinding energy and to increase the grinding capacity, of formulations containing glycerol.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: July 11, 2017
    Assignee: COATEX
    Inventors: Murielle Guillot, Jacques Mongoin, Olivier Guerret
  • Publication number: 20140356627
    Abstract: A brookite-form crystalline titanium oxide powder has a volume-standard median diameter in the range of 0.3 to 40 ?m as measured by a laser diffraction particle size distribution meter, and contains a brookite-form crystal in an amount of 90% by mass or more as measured by a powder X-ray diffraction method. A method for producing a brookite-form crystalline titanium oxide powder comprises a preparation step of preparing a crystalline titanium oxyoxalate powder, and a heating step of heating the crystalline titanium oxyoxalate powder at a temperature of 550° C. to 820° C.
    Type: Application
    Filed: November 29, 2012
    Publication date: December 4, 2014
    Inventor: Koji Sugiura
  • Patent number: 8791044
    Abstract: Methods for preparing and using a photocatalyst are described. The catalyst is prepared by oxidation of a metal salt which has been doped in situ to form a photocatalyst active in visible light. The photocatalyst is used for degrading toxic and irritating compounds and infectious agents.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: July 29, 2014
    Assignee: The United States of America as Represented by the Administrator of the U.S. Environmental Protection Agency
    Inventors: Rajender S. Varma, Babita Baruwati, Jurate Virkutyte
  • Patent number: 8728437
    Abstract: A sulfate process for producing titania from a titaniferous material (as herein defined) including a step of leaching said titaniferous material with a leachant to form a process solution that includes an acidic solution of titanyl sulfate and iron sulfate, wherein said sulfate process further includes a filtration step comprising filtering said leachant to at least substantially remove titanyl sulfate particles from said leachant prior to supplying said leachant to said leach step.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: May 20, 2014
    Assignee: BHP Billiton Innovation Pty Ltd
    Inventors: Alan David Stuart, John Andrew Lawson, Christopher Brett Ward, Hong Peng
  • Patent number: 8557217
    Abstract: A process for synthesizing nano-sized rutile, anatase, or a mixture of rutile and anatase TiO2 powder. The process includes the steps of: 1) forming a Ti-peroxo complex by mixing H2O2 with a Ti compound, and 2) heating the Ti-peroxo complex at a temperature of above 50° C. A primary particle size of TiO2 particles, synthesized by the method, is below 50 nm, and an agglomerated particle size thereof after a washing/dry process is below about 10 ?m. The major characteristics of the present invention are that it is a low temperature process, a highly concentrated synthesis, and high production yield of above 90%.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: October 15, 2013
    Assignee: Tokusen, U.S.A., Inc.
    Inventors: Insoo Kim, Woo Jin Lee, Young Jin Kim, Charles E. Smith, Jr.
  • Patent number: 8295786
    Abstract: The present invention provides a magnetic sheet with improved resistance to folding while maintaining good magnetic characteristics and reliability; a method for producing the magnetic sheet; an antenna; and a portable communication device. A magnetic sheet of the present invention includes a flat magnetic powder, and a resin binder capable of dissolving in a solvent, wherein the magnetic sheet has a gradient of the content ratio of the magnetic powder to the resin binder in a thickness direction thereof, wherein, in use, the magnetic sheet is folded so that, of the front and back surfaces thereof, one surface whose magnetic powder content is lower than that of the other is folded inward, and wherein the difference in glossiness measured at a light-incident angle of 60° between the front and back surfaces is 9.4 or more.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: October 23, 2012
    Assignee: Sony Chemical & Information Device Corporation
    Inventors: Keisuke Aramaki, Junichiro Sugita, Morio Sekiguchi
  • Patent number: 8273322
    Abstract: A sulfate process for producing titania from a titaniferous material (such as an iron-containing titaniferous material; such as ilmenite) is disclosed. The process includes precipitating titanyl sulfate from a process solution produced in the process. The titanyl sulfate precipitation step includes subjecting the precipitated titanyl sulfate to a shearing action during the course of precipitating titanyl sulfate from the process solution or after precipitation has been completed.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: September 25, 2012
    Assignee: BHP Billiton Innovation Pty. Ltd.
    Inventors: Eric Girvan Roche, Philip Ernest Grazier, Alan David Stuart
  • Patent number: 8106101
    Abstract: This invention relates to methods of making single phase nanocrystalline titanium dioxide. It is hereby provided a method for preparing single-phase anatase type titanium dioxide photocatalyst having a particle size of nano level at near room temperatures without the need for a sintering process at high temperatures.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: January 31, 2012
    Assignee: The Hong Kong Polytechnic University
    Inventors: Walid Abdelhamld Daoud, John Haozhong Xin, Kaihong Qi
  • Patent number: 8003069
    Abstract: The invention relates to a method for producing carbon black or other flame aerosols, comprising the following steps: the heat is removed from the flame by dissipation and/or radiation; a thin gas boundary layer is formed; the flow formed by the flame and the gas boundary layer is accelerated or expanded; the obtained aerosol is withdrawn; and the cooling surface is cleaned. The invention further relates to a device for carrying out such a method and a black carbon having a maximum pH value of 6.0, a maximum ignition residue of 0.1 percent, and a maximum 5 ?m screening refuse of 200 ppm. The inventive black carbon can be used in rubber, plastic, printing inks, inks, inkjet inks, toners, lacquers, dyes, paper, bitumen, concrete, and other construction materials.
    Type: Grant
    Filed: June 10, 2010
    Date of Patent: August 23, 2011
    Assignee: Evonik Carbon Black GmbH
    Inventors: Ulrich Riebel, Matthias Katzer, Kai Krauss, Alfons Karl, Juergen Behnisch
  • Patent number: 7932208
    Abstract: A method of preparing stable, transparent photocatalytic titanium dioxide sots is disclosed which involves thermal treatment of a suspension of amorphous titanium dioxide in the presence of certain alpha-hydroxy acids. The sots comprise titanium dioxide particles in the anatase form having a crystallite size less than about 10 nm and exhibit excellent stability and transparency at basic, neutral, and acid pH.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: April 26, 2011
    Assignee: Millennium Inorganic Chemicals, Inc.
    Inventors: Guoyi Fu, Billiejo M. Monk, Robert McIntyre
  • Publication number: 20100266486
    Abstract: This invention pertains to a process for producing ultra-fine rutile titanium dioxide powders. This particular compound is useful as UV-blocker in paints, plastics, coatings, pigments and sunscreens. The new process comprises the steps of providing a hot gas stream and of introducing therein firstly:—a titanium-bearing first reactant; and—a carbon- and/or nitrogen-bearing second reactant; the temperature of said gas stream being chosen so as to vaporize said first and second reactants, these being selected so as to form, at the prevalent temperature, titanium carbide, titanium nitride or a mixture thereof, as a nano-sized precursor; and, thereafter:—a volatile oxygen-bearing reactant selected so as to react with the nano-sized precursor, converting it to nano-sized titanium dioxide powder having a rutile content of at least 50%. This reaction scheme allows for the manufacture of powders with or without doping elements with a primary particle size between 1 and 100 nm.
    Type: Application
    Filed: November 4, 2008
    Publication date: October 21, 2010
    Inventors: Stijn Put, Yves Van Rompaey
  • Publication number: 20100226851
    Abstract: A process for synthesizing nano-sized rutile, anatase, or a mixture of rutile and anatase TiO2 powder. The process includes the steps of: 1) forming a Ti-peroxo complex by mixing H2O2 with a Ti compound, and 2) heating the Ti-peroxo complex at a temperature of above 50° C. A primary particle size of TiO2 particles, synthesized by the method, is below 50 nm, and an agglomerated particle size thereof after a washing/dry process is below about 10 ?m. The major characteristics of the present invention are that it is a low temperature process, a highly concentrated synthesis, and high production yield of above 90%.
    Type: Application
    Filed: September 11, 2007
    Publication date: September 9, 2010
    Inventors: Insoo Kim, Woo Jin Lee, Young Jin Kim, Charles E. Smith, JR.
  • Publication number: 20100202960
    Abstract: It is an object to provide a method for producing titanium dioxide superfine particles, which produces monodispersed titanium dioxide superfine particles depending on its purpose, causes no clogging with a product due to self-dischargeability, requires no great pressure, and is excellent in productivity. In the method for producing titanium dioxide superfine particles in a fluid containing a titanium compound by separation, the fluid is formed into a thin film fluid between two processing surfaces arranged so as to be able to approach to and separate from each other, at least one of which rotates relative to the other, and the titanium dioxide superfine particles are separated in the thin film fluid.
    Type: Application
    Filed: September 11, 2008
    Publication date: August 12, 2010
    Applicant: M. Technique Co., Ltd.
    Inventor: Masakazu Enomura
  • Patent number: 7763232
    Abstract: The invention provides a method for the formation of small-size titanium oxide particles, comprising the steps of a) preparing a starting aqueous solution comprising at least one of titanic ions and complexes thereof, at a concentration of at least 0.1% w/w titanium; b) maintaining the solution at a temperature lower than 70° C. for a retention time in which hydrolysis takes place, the extent of the hydrolysis being sufficient to produce O.i mmol protons per mmol of titanium present in solution, wherein the time does not exceed 14 days, to form a system containing a retained solution; and c) adjusting the conditions in the system by at least one of the steps of: i) heating the retained solution to elevate the temperature thereof by at least 1° C.; ii) changing the pH of the retained solution by at least 0.1 units; and iii) diluting the retained solution by at least 20% whereby there are formed particles, wherein the majority of the particles formed are between about 2 nm and about 500 nm in size.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: July 27, 2010
    Assignee: Joma International AS
    Inventors: Asher Vitner, Aharon Eyal
  • Patent number: 7763565
    Abstract: A method of preparing stable, transparent photocatalytic titanium dioxide sols is disclosed which involves thermal treatment of a suspension of amorphous titanium dioxide in the presence of certain alpha-hydroxy acids. The sots comprise titanium dioxide particles in the anatase form having a crystallite size less than about 10 nm and exhibit excellent stability and transparency at basic, neutral, and acid pH.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: July 27, 2010
    Assignee: Millennium Inorganic Chemicals, Inc.
    Inventors: Guoyi Fu, BillieJo M. Monk, Robert McIntyre
  • Patent number: 7700057
    Abstract: The invention provides a method for the Industrial purification of a titanium feed stream of purity P1, by the formation of a titanium-double-salt precipitate of purity P2 and a titanium solution with purity P3, wherein P2>P1>P3, the method comprising the steps of: i. forming, from the feed, a medium comprising water, titanium ion, a cation selected from the group consisting of ammonium, cations of alkali metals, protons and a combination thereof, and an anion selected from the group consisting of OH, SO4, HSO4, halides and a combination thereof, which formed medium is further characterized by the presence of (a) a double-salt precipitate comprising titanium ion, at least one of the cations and at least one of the anions; and (b) a titanium solution; and wherein the concentration of the anion in the titanium solution is higher than 15% and the ratio between the concentrations of the cation and the anion in the titanium solution is higher than 0.2 and lower than 1.6; and ii.
    Type: Grant
    Filed: October 15, 2006
    Date of Patent: April 20, 2010
    Assignees: Joma International AS, Asher Vitner Ltd.
    Inventors: Asher Vitner, Aharon Eyal, Revital Mali
  • Patent number: 7691781
    Abstract: This invention provides layered porous titanium oxide comprising an inorganic oxide as a core and titanium oxide deposited on the surface of the inorganic oxide, wherein the titanium localization index B/A represented by the ratio of the proportion of titanium (Ti) to the sum of the constituent metal (M) of the inorganic oxide and titanium (Ti) determined by X-ray photoelectron spectroscopy (XPS) [B=Ti XPS/(Ti XPS+M XPS)] to the bulk mixing molar ratio of titanium (Ti) to the sum of the constituent metal (M) of the inorganic oxide and titanium (Ti) [A=Ti/(Ti+M)] is 1.6 or more and the titanium oxide is deposited on the surface of the inorganic oxide so as to be chemically and/or microscopically united to the inorganic oxide and also provides a process for producing the same and a catalyst comprising the same. The layered porous titanium oxide of this invention has a regulated pore structure, a large specific surface area, and excellent mechanical strength and is useful as a catalyst or a catalyst carrier.
    Type: Grant
    Filed: December 25, 2003
    Date of Patent: April 6, 2010
    Assignee: Chiyoda Corporation
    Inventors: Shinichi Inoue, Akihiro Mutou, Yukitaka Wada, Hidehiko Kudou, Tateo Ono, Hisashi Nomura
  • Publication number: 20100059447
    Abstract: The present invention relates to products and methods for removing or recovering substances from aqueous solution. Titanic acid product is used as adsorption material for several substances, for example impurities or contaminants, such as arsenic, lead, fluorine or phosphate. The present invention also relates to a granule for removing substances from aqueous solution and a filter assembly comprising titanic acid or said granule.
    Type: Application
    Filed: February 17, 2006
    Publication date: March 11, 2010
    Inventor: Mika Martikainen
  • Patent number: 7625835
    Abstract: A composite photocatalyst includes a semiconducting core and a nanoscale particle disposed on a surface of the semiconducting core, wherein the nanoscale particle is an electron carrier, and wherein the photocatalyst is sensitive to visible light irradiation.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: December 1, 2009
    Assignees: GM Global Technology Operations, Inc., Pohang University of Science and Technology
    Inventors: Wei Li, Se H. Oh, Jae S. Lee, Jum S. Jang
  • Patent number: 7485268
    Abstract: A sulfate process for producing titania from a titaniferous material is disclosed. The process includes leaching the titaniferous material and producing a leach liquor, separating titanyl sulfate from leach liquor, hydrolysis of the extracted titanyl sulfate, and thereafter calcining the solid phase produced in the hydrolysis step. The process is characterised by controlling the hydrolysis step and forming a selected particle size distribution of hydrated titanium oxides from titanyl sulfate.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: February 3, 2009
    Assignee: BHP Billiton Innovation Pty. Ltd.
    Inventors: Eric Girvan Roche, Alan David Stuart, Ernest Philip Grazier, Houyuan Liu
  • Patent number: 7429364
    Abstract: A sulfate process for producing titania from a titaniferous material is disclosed. The process includes leaching the titaniferous material and producing a leach liquor, precipitating iron sulfate from the leach liquor, solvent extraction of titanyl sulfate from leach liquor, hydrolysis of the extracted titanyl sulfate, and thereafter calcining the solid phase produced in the hydrolysis step. The process is characterised by using at least part of the raffinate from the solvent extraction step as at least part of the leach solution in the initial leach step.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: September 30, 2008
    Assignee: BHP Billiton Innovation Pty. Ltd.
    Inventors: Eric Girvan Roche, Alan David Stuart, Philip Ernest Grazier
  • Patent number: 7381398
    Abstract: A titanium oxide powder holding a barium compound on the surface of the particles thereof is used for manufacturing a highly crystalline fine barium titanate powder by solid-phase reaction. When the titanium oxide powder and a barium-containing powder material are mixed and calcined to prepare the barium titanate powder, the barium compound on the surfaces of the titanium oxide powder particles inhibits the sintering, or the growth, of the titanium oxide during the calcination. Consequently, the resulting barium titanate powder is highly crystalline and fine.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: June 3, 2008
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Syunsuke Nakaya, Masami Yabuuchi
  • Patent number: 7371276
    Abstract: The titanium dioxide pigment of the present invention contains an anatase type crystal in an amount of 98-100% and has an average particle diameter of 0.2-0.4 ?m and a whiteness of 95-97 in terms of L value of linseed oil. The titanium dioxide pigment of the present invention has characteristics peculiar to anatase type, for example, optical characteristics such as bluish color tone and physical characteristics such as low hardness, and furthermore has high opacity which is not possessed by conventional anatase type titanium oxide pigments.
    Type: Grant
    Filed: August 6, 2003
    Date of Patent: May 13, 2008
    Assignee: Ishihara Sangyo Kaisha, Ltd.
    Inventors: Hideo Takahashi, Toshihiko Akamatsu, Kazuhiro Tominaga, Taku Katou, Yoshio Nagai, Yoshitaka Muraki, Yukako Ota
  • Patent number: 7326390
    Abstract: A sulfate process for producing titania from titaniferous material is disclosed. The process includes precipitating titanyl sulfate from leach liquors containing acidic solutions of titanyl sulfate. The process is characterised by: (a) multiple stage leaching to produce leach liquors containing acidic solutions of titanyl sulfate; (b) using depleted leach liquor from a titanyl sulfate precipitation reactor in the leach steps; and (c) controlling acid concentration in the leach steps to avoid premature hydrolysis and premature precipitation.
    Type: Grant
    Filed: April 15, 2005
    Date of Patent: February 5, 2008
    Assignee: BHP Billiton Innovation Pty Ltd.
    Inventors: Eric Girvan Roche, Alan David Stuart, Philip Ernest Grazier, Sarah Nicholson
  • Patent number: 7008602
    Abstract: Processes for the efficient and economical beneficiation of titaniferous ore are provided. A unique process for beneficiating ore comprising pretreatment of the ore by oxidation and reduction, followed by acid leaching with sulfuric acid has been developed. The acid used in this process may be recycled, which will thereby increase the efficiency of the process. Preferably the ore treated according to the present invention is ilmenite ore.
    Type: Grant
    Filed: April 19, 2002
    Date of Patent: March 7, 2006
    Assignee: Millennium Inorganic Chemicals, Inc.
    Inventors: Earl Smith, Michael Robinson, Kirit Talati
  • Patent number: 6991677
    Abstract: Titanium dioxide-calcium carbonate composite particles capable of realizing characteristic properties inherent in titanium dioxide such as a high opacity, a process for producing the same, and a complex composition or complex incorporated with the same are provided. The composite particles were prepared by adding titanium dioxide particles having an average particle diameter of 0.1 to 0.5 ?m in a carbonation step, typically a step of introducing a gaseous mixture of carbon dioxide and air into a calcium hydroxide slurry with stirring, to conduct a carbonation, and continuing the reaction till pH of the slurry becomes 7 by continuous introduction of the gaseous mixture. Moreover, by incorporating the formed composite particles, complexes such as coatings and paints for paper making or composite materials such as paper, plastic molded materials, and rubber molded materials are produced.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: January 31, 2006
    Assignee: Nittetsu Mining Co., Ltd.
    Inventors: Katsuyuki Tanabe, Kouhei Mitsuhashi, Takehiko Yoshida
  • Publication number: 20040120884
    Abstract: Nanoparticulate titanium dioxide coating produced by educing flocculates of titanium dioxide nanoparticles from a titanyl sulfate solution and dispersing the nanoparticles in a polar sol-forming medium to make a sol suitable as a coating usable to impart photocatalytic activity, U.V. screening properties, and fire retardency to particles and to surfaces. The photocatalytic material and activity is preferably localized in dispersed concentrated nanoparticles, spots or islands both to save costs and leverage anti-microbial effects.
    Type: Application
    Filed: November 28, 2003
    Publication date: June 24, 2004
    Inventor: Jonathan Sherman
  • Patent number: 6752973
    Abstract: A process for producing a titanium oxide is provided which comprises the steps of (i) mixing an acidic solution of a titanium compound with a nitrogen-containing basic organic compound to obtain a reaction product and (ii) calcining the obtained product. The titanium oxide exhibits a high photocatalytic activity by visible light radiation.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: June 22, 2004
    Assignee: Sumitomo Chemical Company, Limited
    Inventor: Kensen Okusako
  • Patent number: 6653356
    Abstract: Nanoparticulate titanium dioxide coating produced by educing flocculates of titanium dioxide nanoparticles from a titanyl sulfate solution and dispersing the nanoparticles in a polar sol-forming medium to make a sol suitable as a coating usable to impart photocatalytic activity, U.V. screening properties, and fire retardency to particles and to surfaces. The photocatalytic material and activity is preferably localized in dispersed concentrated nanoparticles, spots or islands both to save costs and leverage anti-microbial effects.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: November 25, 2003
    Inventor: Jonathan Sherman
  • Patent number: 6562313
    Abstract: An electrode material for an electrochemical capacitor having a large capacity, having a titanium oxide compound such as titanium oxide, hydrated titanium oxide or their hydrogenated products, and at least one oxidizable and reducible metal element contained in the titanium oxide compound.
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: May 13, 2003
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Yoshio Takasu, Yasushi Murakami, Mitsuo Ueno, Shigeo Aoyama, Mayumi Iwagawa, Kiyoshi Sato, Seiichi Asada
  • Patent number: 6548039
    Abstract: A hydrometallurgical process is provided for producing pigment grade TiO2 from titanium containing solutions. Generally, the solution is an aqueous solution. The process includes hydrolyzing the solution via complete evaporation in well-controlled conditions of temperature to form titanium oxide of well-defined characteristics. The hydrolyzing can be achieved by spray hydrolysis in a spray dryer. After hydrolyzing, the titanium oxide is calcined to transform the titanium oxide to the desired form of titanium dioxide. The titanium dioxide can be either anatase or rutile. Following calcination, the titanium dioxide is milled to provide the desired particle size distribution and then finished.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: April 15, 2003
    Assignee: Altair Nanomaterials Inc.
    Inventors: Willem P. C. Duyvesteyn, Timothy Malcome Spitler, Bruce James Sabacky, Andrew Vince, Jan Prochazka
  • Patent number: 6458452
    Abstract: The present invention relates to titanium oxide particles having an average particle size of not more than 0.3 &mgr;m, and a BET specific surface area of 15 to 200 m2/g, containing a soluble sodium salt of not more than 230 ppm, calculated as Na, and a soluble sulfate of not more than 150 ppm, calculated as SO4, and having a pH value of not less than 8. The titanium oxide particles of the present invention are suitable as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium which uses magnetic particles containing iron as a main ingredient, and even more particularly, are suitable as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium which uses magnetic particles containing iron as a main ingredient, show an excellent dispersibility in a binder resin, contain only a small amount of soluble sodium salt and soluble sulfate, and have a pH value of not less than 8.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: October 1, 2002
    Assignee: Toda Kogyo Corporation
    Inventors: Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Morii
  • Patent number: 6139816
    Abstract: A novel process for the preparation of ultra-fine powders of metal oxide wherein a surfactant is added to the solution for the preparation of the metal oxide to provide nanometer metal oxide powders without the utilization of vacuum or high pressure conditions is disclosed.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: October 31, 2000
    Assignee: Merck Kanto Advanced Chemical LTD
    Inventors: Ru-Shi Liu, Shich-Chang Suen, Yu-Hua Kao
  • Patent number: 6113873
    Abstract: To hydrous titanium dioxide obtained by hydrolysis of titanium sulfate was added a predetermined amount of a water-soluble aluminum compound and/or a water-soluble zinc compound, the mixture is calcined, and a suitable amount of aluminum and/or zinc is introduced into the crystals to make up the crystal defects of anatase-type titanium dioxide, so that it has increased stability and excellent color stability.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: September 5, 2000
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Makoto Tunashima, Kazuyoshi Muraoka, Kohji Yamamoto, Masaru Mikami, Suzuo Sasaki
  • Patent number: 6099634
    Abstract: A titanyl sulfate solution or a titanium tetrachloride solution is neutralized with an alkali to form orthotitanic acid, to which hydrochloric acid is added such as to adjust the TiO.sub.2 concentration to 80-140 g/L and the HCl concentration to 90-150 g/L and a synthesis reaction is performed at a temperature of 25-60.degree. C. to produce titanium oxide particles in which needles aggregate and/or bind together to yield fan-shaped particles.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: August 8, 2000
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Toshiaki Uenishi, Takanori Yamasaki
  • Patent number: 6074472
    Abstract: Titanium dioxide pigments are obtainable by complete hydrolysis of a hydrolyzable titanium compound at from 0 to 100.degree. C. with intensive stirring and with setting of a pH in the range from 3 to 8 and maintenance of this pH within a range of 0.3 units.The titanium dioxide pigments can be employed for the production of cosmetic preparations and medicaments.
    Type: Grant
    Filed: February 12, 1998
    Date of Patent: June 13, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Harald Jachow, Ekkehard Schwab, Claudius Kormann, Wilma Dausch, Karin Sperling, Horst Westenfelder
  • Patent number: 5846511
    Abstract: The process for preparing crystalline titania powders is provided. The process comprises dissolving titanium salt in a mixed solvent of water and alcohol, heating the resulting solution to 15.degree..about.75.degree. C. to form titanium hydroxide precipitates, and crystallizing the titanium hydroxide precipitates.
    Type: Grant
    Filed: June 19, 1996
    Date of Patent: December 8, 1998
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Chong Hee Kim, Do Kyung Kim, Young Tae Moon, Hong Kyu Park
  • Patent number: 5833892
    Abstract: In a method of producing TiO.sub.2 pigment particles a TiO.sub.a X.sub.b (OH).sub.c -based precursor is suspended in a liquid with or without fuel additives. The suspension is then sprayed to form droplets. The droplets are transported into a flow reactor with a carrier gas. The droplets are decomposed in the flow reactor at high temperatures to form TiO.sub.2 pigment particles which are collected downstream of the flow reactor. In a preferred embodiment, a colloidal suspension of an insoluble TiO(SO.sub.4).sub.b (OH).sub.c precipitate with suitable fuel additives was spray-calcined at 900.degree. to 1200.degree. C. to produce pigment-quality TiO.sub.2. The primary particle size of the TiO.sub.2 pigment particles is between 150-250 nm and the particles are minimally aggregated.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: November 10, 1998
    Assignee: Kemira Pigments, Inc.
    Inventors: Abhijit S. Gurav, Toivo T. Kodas, Bruce M. Anderson
  • Patent number: 5630995
    Abstract: A process for preparing anatase titanium dioxide by precipitating hydrous titanium oxide in the absence of added nuclei from a solution of titanium sulphate containing the equivalent of 200 to 300 grams TiO.sub.2 per liter and having an acid to titanium ratio in the range 1.6:1 to 2.2:1, the precipitation being induced by the addition of 5 to 35 parts water per 100 parts titanium sulphate solution. The hydrous titanium oxide is calcined in the presence of an amount of potassium compound equivalent to between 0.20 and 0.60 weight percent calculated as K.sub.2 O based on TiO.sub.2 and between 0.15 and 0.55 weight percent phosphorus calculated as P.sub.2 O.sub.5 based on TiO.sub.2. The hydrous titanium oxide is subjected to calcination in a process having a specified thermal profile. The product of the process is anatase titanium dioxide having an average crystal size larger than conventionally prepared anatase. Said product is easily milled to form a product with a high single crystal fraction.
    Type: Grant
    Filed: January 17, 1996
    Date of Patent: May 20, 1997
    Assignee: Tioxide Group Services Limited
    Inventors: David L. Foulger, Piergiorgio Nencini, Sergio Pieri
  • Patent number: 5527469
    Abstract: A titanium oxide hydrolysate slurry prepared by the sulfate process is treated with either an alkali metal hydroxide or an alkali metal carbonate to solubilize the sulfur bound to the titanium at a temperature of from 60.degree. C. to 120.degree. C. and the slurry is treated with an organic acid to remove the alkali metal compounds present. This process produces titanium oxide hydrolysate of high purity.
    Type: Grant
    Filed: June 12, 1995
    Date of Patent: June 18, 1996
    Inventors: Earl R. Lawhorne, Woodford R. Brown, Jr.
  • Patent number: 5468463
    Abstract: A process for the preparation of very pure titanium dioxide by reacting titanium tetrahalides with sulphuric acid, hydrolysis the titanyl sulphate solution obtained and calcining the hydrolysate is disclosed wherein the reaction between titanium tetrahalide and aqueous 20-40% by weight strength sulphuric acid is performed in such a way that crystallisation of titanyl sulphate does not take place, the hydrogen halide is separated, the solution is optionally concentrated and filtered and then the ratio by weight of sulphuric acid to titanium dioxide is adjusted to between 1.7 and 2.0 and the titanium dioxide concentration is adjusted to between 250 and 300 g/l, the solution is hydrolyzed and the resulting titanium oxide hydrate is filtered off and calcined to give Futile or anatase.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: November 21, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Kai Butje, Jurgen Kischkewitz
  • Patent number: 5409679
    Abstract: The production of titanium dioxide by the sulphate process generates waste substances such as the wash filtrates, which are formed in the washing of titanium dioxide hydrate, and waste gases which contain sulphur dioxide. In this improved process the wash filtrate is used to remove the sulphur dioxide from the waste gas while the sulphuric acid content of the wash filtrate is raised and the sulphuric acid-containing process solution thus obtained is used within the scope of the titanium dioxide production process. The waste gas and the wash filtrate are passed countercurrently through a series of several washing steps and are contacted with each other by introducing the wash liquid into the waste gas in a finely divided form in scrub towers. The sulphuric acid content of the washing fluid is stepwise changed from washing stage to washing stage. The sulphur dioxide content of the waste gas is reduced to values that may be discharged into the ambient atmosphere.
    Type: Grant
    Filed: July 5, 1990
    Date of Patent: April 25, 1995
    Assignee: Kronos, Inc.
    Inventor: Achim Hartmann
  • Patent number: 5264033
    Abstract: Disclosed is a process for producing a titanium dioxide pigment used for a resin-coated paper type photographic support, comprising the following steps:(a) a step of adding at least one alkaline earth metal compound in an amount of 0.01-2.0% by weight in terms of a metal oxide based on the titanium dioxide before calcination step and(b) an acid-washing step of washing the titanium dioxide at acidic state after the calcination step and before a step of surface treatment with a hydrated metal oxide,and wherein particle size of the titanium dioxide pigment is 0.110-0.150 .mu.m shown by number-average diameter obtained by measuring the diameter in a certain direction using an electron microscope.A photographic support which comprises the above titanium dioxide pigment is also disclosed.Occurrence of die lip stain and microgrit are substantially restrained in this photographic support and a photographic material made of it shows improved image sharpness.
    Type: Grant
    Filed: June 13, 1991
    Date of Patent: November 23, 1993
    Assignees: Mitsubishi Paper Mills Ltd, Tohkem Products Corp.
    Inventors: Touru Noda, Akira Uno, Kazuyoshi Muraoka
  • Patent number: 5229087
    Abstract: A process for the preparation of titanium dioxide by the sulphate process in which titanium raw materials are decomposed with sulphuric acid, the resulting titanyl sulphate is hydrolyzed, the waste acid is separated from the hydrolyzate and evaporated to a concentration of 60 to 70%, sulphuric acid is separated from the solid metal sulphates, and the sulphuric acid which has been concentrated by evaporation is used again for the decomposition of the titanium raw material, the improvement wherein the 60 to 70% sulphuric acid is concentrated to 70 to 80% H.sub.2 SO.sub.4 in a further evaporation stage and the concentration of a part of this sulphuric acid is raised to a concentration of 98 to 99% H.sub.2 SO.sub.4 by the absorption of SO.sub.3 and then used together with the remainder of the above-mentioned 70 to 80% sulphuric acid for the decomposition of titanium raw materials.
    Type: Grant
    Filed: May 14, 1990
    Date of Patent: July 20, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Heinz Schultz, Gunter Lailach, Rudolf Gerken
  • Patent number: 5173386
    Abstract: The present invention provides novel titanium dioxide aggregates especially suitable for an electrophotographic photosensitive material. This titanium dioxide aggregates comprise sintered aggregates of fine primary particles and have a rutile type crystal structure and an oil absorption of 35-65. This titanium dioxide aggregates which are treated with a mineral acid is also provided. There is also provided an electrophotograpic photosensitive material which contains such titanium dioxide in a photosensitive layer.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: December 22, 1992
    Assignee: Ishihara Sangyo Kaisha, Ltd.
    Inventor: Sadao Murasawa
  • Patent number: 5169619
    Abstract: There is provided a method of producing titanium oxides which comprises: admixing an aqueous solution of titanium tetrachloride with sulfuric acid in a molar ratio of sulfuric acid to titanium tetrachloride of at least 0.5 adding an alklai to the resultant solution to produce titanium hydroxide; and drying and calcining the titanium hydroxide. A further method is provided which comprises: adding a solution of an alkali to an aqueous solution of titanium tetrachloride having a concentration of not more than 2.5 moles/l at temperatures of not less than 50.degree. C., thereby to substantially thermally hydrolyze the titanium tetrachloride and to produce titanium hydroxide; and drying and calcining the titanium hydroxide.
    Type: Grant
    Filed: February 12, 1991
    Date of Patent: December 8, 1992
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Masafumi Yoshimoto, Tadao Nakatsuji, Kazuhiko Nagano
  • Patent number: 5147629
    Abstract: A process for the production of a suspension of nuclei has been developed in which an aqueous mixture of titanium tetrachloride, aluminium ions and hydroxyl ions is cured at at temperature of from 50.degree. to the boiling point. The pH of the suspension before or after curing has a value of from 6.5 to 10.5. The aqueous mixture is prepared by mixing a solution of titanium tetrachloride with a solution of a base, e.g. sodium hydroxide and aluminium hydroxide.When used to nucleate hydrolysis in the "sulphate" process a large crystal size anatase pigment is produced.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: September 15, 1992
    Assignee: Tioxide Group Services Limited
    Inventors: John Robb, Ian G. Dobson
  • Patent number: 5094834
    Abstract: In the production of TiO.sub.2 pigments by the steps of digesting titanium-containing raw materials with sulfuric acid, hydrolyzing the titanyl sulfate obtained, separating the waste acid from the hydrolyzate, bleaching the hydrolyzate and calcining the hydrolyzate after addition of rutilizing nuclei and standardizing chemicals to form TiO.sub.2 pigments, and recovering sulfuric acid from the waste acid, the improvement which comprises employing as the rutilizing nuclei nuclei produced from part of the bleached and then washed hydrolyzate, which nuclei are added to the remainder of the bleached and washed hydrolyzate before calcination.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: March 10, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Wiederhoft, Gunter Lailach
  • Patent number: 5061473
    Abstract: A titanium dioxide composition useful as the opacifier agent for vitreous enamels and fusion enamels comprises TiO.sub.2 predominantly in the form of isometric primary particles from 0.5 to 5.0 .mu.m in size, which are aggregated to predominantly spherolithic particles 1 to 100 .mu.m in diameter, with a BET surface of 1 to 4.5 m.sup.2 /g and an apparent density of 0.2 to 1.3 kg/1, is prepared by subjecting titanium dioxide hydrate having a BET surface of from 50 to 500 m.sup.2 /g to accelerated calcination at temperatures of 800.degree. to 1600.degree. C.
    Type: Grant
    Filed: June 13, 1990
    Date of Patent: October 29, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rene De Cleyn, Peter Thometzek, Jakob Rademachers
  • Patent number: 5045301
    Abstract: Poorly crystallized or amorphous TiO.sub.2 particulates having a mean particle size greater than 20 nm are prepared by thermally hydrolyzing a titanium compound in solution, in the presence of at least one carboxylic acid containing a hydroxyl and/or amino group, or an organophosphoric acid; the TiO.sub.2 particulates thus produced are readily molded/extruded into useful shaped articles, e.g., catalysts or catalyst supports, having good porosity and mechanical properties.
    Type: Grant
    Filed: June 30, 1989
    Date of Patent: September 3, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventors: Thierry Chopin, Patrick Fourre, Eric Quemere