With Additive Patents (Class 423/265)
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Patent number: 6228338Abstract: The present invention features methods for preparing stabilized &agr;-AlH3 and &agr;′-AlH3, compositions containing these alane polymorphs, e.g., energetic compositions such as rocket propellants, and methods for using the novel polymorphs as chemical reducing agents, polymerization catalysts, and as a hydrogen source in fuel cells and batteries. The method produces stabilized alane by treating &agr;-AlH3 with an acidic solution that optionally contains a stabilizing agent such as an electron donor, an electron acceptor, or a compound which coordinates the Al3+ ion.Type: GrantFiled: June 16, 1999Date of Patent: May 8, 2001Assignee: SRI InternationalInventors: Mark A. Petrie, Jeffrey C. Bottaro, Robert J. Schmitt, Paul E. Penwell, David C. Bomberger
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Patent number: 6207612Abstract: The invention provides media for absorption of phosphate and metal contaminants from a hydrocarbon stream and a method of making such media. The media comprise alumina with relatively minor amounts of calcia and magnesia and are made by a process in which the minor components or precursors of such components are dispersed in a gelled sol of a hydrated alumina such as boehmite.Type: GrantFiled: January 3, 2000Date of Patent: March 27, 2001Assignee: Norton Chemical Process Products CorporationInventors: John S. Reid, Thomas Szymanski
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Patent number: 6183710Abstract: A sodium cyanide composition having a paste-like consistency is provided which comprises sodium cyanide, a base, water, and a rheology modifier. Also provided are processes for producing and using the composition. The composition can be used in applications that require sodium cyanide solution.Type: GrantFiled: April 8, 1999Date of Patent: February 6, 2001Assignee: E. I du Pont de Nemours and CompanyInventors: Janet Marie Rogers, Thomas Peter Tufano
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Patent number: 5981072Abstract: Flexible graphite sheet is made by compressing a mixture of fine particle of intercalated, exfoliated, expanded natural graphite with fine particles of intercalated, unexpanded, expandable particles of natural graphite admixed with small amounts of a phosphorous bearing compound, the unexpanded particles being more finely sized than the expanded particles. The resulting sheet of flexible graphite exhibits improved fire retardant and sealability properties and additionally resistance to oxidation and corrosion.Type: GrantFiled: July 2, 1997Date of Patent: November 9, 1999Assignee: Ucar Carbon Technology CorporationInventors: Robert Angelo Mercuri, David Paul Blain, Joe Tom McGlamery
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Patent number: 5906805Abstract: The invention provides stabilized hydroxylamine solutions. In particular, stabilized hydroxylamine solutions and processes for their preparation are provided in which the stabilizing compound is cyclohexanediaminetetraacetic acid, hydrochloride salts of thiamine, or mixtures thereof.Type: GrantFiled: April 30, 1997Date of Patent: May 25, 1999Assignee: AlliedSignal Inc.Inventors: Chin Hsiung Chang, Alan E. Van Til, Zhenrong Qian
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Patent number: 5906804Abstract: Magnesium hydroxide slurries having the following characteristics: (i) having a solids content of between 40-80 wt. % based on the weight of the slurry with the balance being water; (ii) containing between 0.01-5.0 wt.% of at least one viscosity modifying agent or dispersant based on the weight of the slurry selected from the following groups: (1) inorganic acids having a molecular weight less than 130 amu and their inorganic salts excluding H.sub.2 SO.sub.4, H.sub.3 PO.sub.4, silicic acid and salts having an alkali metal as sole cation; (2) low molecular weight (i.e.Type: GrantFiled: January 23, 1997Date of Patent: May 25, 1999Assignee: Orica Australia Pty, Ltd.Inventors: Halil Aral, Martin Richard Houchin, Phillip Robin Strode, Robert Van Merkestein, Philip Bush
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Patent number: 5869016Abstract: A method for producing a polyorganophosphazene, such as, for example, poly?di(carboxylatophenoxy)phosphazenel!, from polydichlorophosphazene. The polydichlorophosphazene is reacted with at least one nucleophilic reagent at a defined molar ratio of the at least one nucleophilic reagent to the polydichlorophosphazene. Such process results in the production of a polyorganophosphazene having a molecular weight within a desired range.Type: GrantFiled: June 18, 1997Date of Patent: February 9, 1999Assignee: Virus Research Institute, Inc.Inventors: Alexander K. Andrianov, Mark P. LeGolvan, Yuri Svirkin, Sameer S. Sule
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Patent number: 5824279Abstract: Magnesium hydroxide slurries and a method of producing same that can be shipped, without agitation, over a period of at least 28 days and can be readily removed from transport vehicles to customer storage. With respect to customer usage, such slurries can be readily handled without leaving significant residue in storage tanks and without fouling the customer's equipment. Also disclosed are magnesium hydroxide slurries containing a level of solids that is greater than what is commercially available and a method of producing same.Type: GrantFiled: January 19, 1995Date of Patent: October 20, 1998Assignee: Martin Marietta Magnesia Specialties, Inc.Inventors: Alvin Richmond, Robert J. Gutowski
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Patent number: 5811070Abstract: A process for producing calcium carbonate particles having an average size of 0.1 to 1.0 .mu.m, the process comprising the steps of introducing carbon dioxide into a milk of lime containing a first reagent to prepare an aqueous suspension containing calcium carbonate particles of 0.4 .mu.m in average size, adding a milk of lime into the aqueous suspension, and continuously reacting a carbonated solution containing a second reagent with the aqueous suspension. Calcium carbonate powders according to the process show a superior quality as a filler for adhesives, paints, inks, papers and plastics, especially PET films.Type: GrantFiled: April 23, 1997Date of Patent: September 22, 1998Inventor: Kyu Jae You
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Patent number: 5811069Abstract: A long term stabilized magnesium hydroxide suspension which can be stored for at least six months without substantial agitation and without undergo substantial settlement nor solid hard substrate formation, comprising a solid content of about 51% to 62%; a water content of about 38% to 49%; a viscosity of about 50 to 400 cp.; an average particle size of about 1 to 2.5 microns; a Mg(OH).sub.2 content of about 50% to 60%; an equivalent magnesium oxide content of 34% to 42%; and including an anionic polyelectrolyte as a dispersant agent, and which is obtained by washing, filtering and repulping magnesium hydroxide solids to obtain agglomerated solid particles, dispersing the agglomerated solid particles by comminution in a dispersing equipment, to reduce the particle size providing a dispersed product, grinding the dispersed product to additionally reduce the particle size to about 2 microns; and adding an anionic polyelectrolyte at a concentration of at least 25%, in an amount of about 0.5 to 1.Type: GrantFiled: February 25, 1997Date of Patent: September 22, 1998Assignee: Servicios Industriales Penoles, S.A. DE C.V.Inventors: Cesar-Emilio Zertuche-Rodriguez, Ricardo Benavides-Perez, Jose-Gertrudis Bocanegra-Rojas, Gabriel-Arturo Santoy-Alvarez
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Patent number: 5800805Abstract: This invention provides a deodorant composition in a dispensing container which is pressurized with an aerosol propellant. The primary ingredients of a typical product are particulate sodium bicarbonate, ethanol, volatile silicone oil and a suspending agent such as hydrophobic hectorite clay. An invention aerosol deodorant product has a stable particulate sodium bicarbonate suspension phase, and exhibits excellent fluid evacuation properties with a relatively high content of ethanol and low content of aerosol propellant.Type: GrantFiled: June 19, 1997Date of Patent: September 1, 1998Assignee: Church & Dwight Co., IncInventor: Lucia Salas
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Patent number: 5783161Abstract: The present invention relates to stabilized hydroxylamine solutions comprising as stabilizer at least one compound of the formula IR.sup.1 R.sup.2 N--A--NR.sup.3 R.sup.4 (I)in which A and R.sup.1 to R.sup.4 are as defined in the description.Type: GrantFiled: July 25, 1996Date of Patent: July 21, 1998Assignee: BASF AktiengesellschaftInventors: Hans-Michael Schneider, Bernd Leutner
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Patent number: 5755868Abstract: Unique colorant compositions, well suited for the pigmentation of a wide variety of coatings and substrates, e.g., cosmetics, plastics, paints and rubbers, comprise (1) at least one crystalline rare earth metal sulfide or sesquisulfide, for example cubic cerium sesquisulfide Ce.sub.2 S.sub.3, and (2) a dopant amount of at least one alkali metal, and wherein the at least one rare earth metal sulfide or sesquisulfide comprises whole (unground) monocrystalline grains thereof having a mean particle size of at most 1.5 .mu.m.Type: GrantFiled: June 16, 1997Date of Patent: May 26, 1998Assignee: Rhone-Poulenc ChimieInventor: Pierre Macaudiere
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Patent number: 5747401Abstract: Mixed oxides of cerium and zirconium as well as solid solutions and cerium oxides are produced having improved thermal stability. The process involves the formation of cerium and zirconium oxides, mixed oxides and solid solutions by methods such as co-thermohydrolysis and co-precipitation, followed by washing or impregnating with an alkoxylated compound having greater than 2 carbon atoms. After the washing or impregnating step, the mixture is calcined to form oxides having very high surface area and oxygen storage capacity. The improved thermal stability of the oxides makes them advantageous for use in applications such as catalytic converters.Type: GrantFiled: October 15, 1996Date of Patent: May 5, 1998Assignee: Rhone-Poulenc Inc.Inventor: Jean Pierre Cuif
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Patent number: 5741432Abstract: A composition that includes an aqueous solution of nitric acid and an additive having the formula ##STR1## or a salt thereof, in an amount sufficient to improve the oxidative stability of the aqueous nitric acid solution relative to the oxidative stability of that aqueous solution in the absence of the additive.Type: GrantFiled: January 17, 1995Date of Patent: April 21, 1998Assignee: The Dexter CorporationInventor: Kwee C. Wong
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Patent number: 5723101Abstract: Mixed oxides of cerium and zirconium as well as solid solutions and cerium oxides are produced having improved thermal stability. The process involves the formation of cerium and zirconium oxides, mixed oxides and solid solutions by methods such as co-thermohydrolysis and co-precipitation, followed by washing or impregnating with an alkoxylated compound having greater than 2 carbon atoms. After the washing or impregnating step, the mixture is calcined to form oxides having very high surface area and oxygen storage capacity. The improved thermal stability of the oxides makes them advantageous for use in applications such as catalytic converters.Type: GrantFiled: October 15, 1996Date of Patent: March 3, 1998Assignee: Rhone-Poulenc Inc.Inventor: Jean Pierre Cuif
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Patent number: 5714201Abstract: A process for reducing dissolution time in the production of sodium percarbonate particles containing an alkali metal silicate as stabilizer by fluidized bed spray granulation and/or by coating sodium percarbonate particles with a coating containing an alkali metal silicate, wherein a solution containing alkali metal silicate is sprayed during production and/or coating which contains alkali metal silicate having a modulus in the range from less than 3 to greater than 1. Sodium percarbonate produced by fluidized bed spray granulation is distinguished by elevated Oa stability and short dissolution times and may thus readily be used in detergents and cleaning products containing silicate builders.Type: GrantFiled: September 13, 1996Date of Patent: February 3, 1998Assignee: Degussa AktiengesellschaftInventors: Martin Bewersdorf, Birgit Bertsch-Frank, Wolfgang Lortz
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Patent number: 5707597Abstract: A solution which comprises a polyphosphazene solute, such as a polyhalophosphazene solute, and a stabilizing solvent such as diglyme. Such solution enables the polyphosphazene to remain stable for extended periods of time so that such polyhalophosphazenes may be employed for further modification or use.Type: GrantFiled: November 13, 1996Date of Patent: January 13, 1998Assignee: Virus Research Institute, Inc.Inventors: Alexander K. Andrianov, Jonathan R. Sargent, Sameer S. Sule, Mark LeGolvan
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Patent number: 5705468Abstract: A vehicle and method for storing ozone is disclosed. A vehicle made of a water miscible, organic compound of a glycol-containing chemical compound, a tertiary alcohol or a mixture thereof that is capable of receiving and containing ozone is disclosed. The method involves producing ozone gas, introducing the ozone-containing gas into a mixing vessel that contains the aforementioned organic compound, agitating the organic compound in the presence of the ozone-containing gas, wherein the ozone-containing gas is at atmospheric pressure or at a pressure of up to about 150 psig., and releasing the pressure if pressures in excess of atmospheric are used.Type: GrantFiled: November 18, 1996Date of Patent: January 6, 1998Assignee: Quantum Technologies, Inc.Inventors: Robert E. Yant, Marilyn M. Hurst, David B. Galluch
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Patent number: 5703323Abstract: Disclosed is a stabilized hydroxylammonium nitrate or hydroxylamine-containing composition comprising said hydroxylammonium nitrate or hydroxylamine and a pyridine or pyridone salt, or an acid thereof, said pyridine or pyridone salt, or acid thereof, being present in said composition in an amount of between about 0.0001% and about 2%, based upon the weight of said composition. Also disclosed is a process for preparing this composition.Type: GrantFiled: September 17, 1996Date of Patent: December 30, 1997Assignee: Olin CorporationInventors: Eugene F. Rothgery, Carl G. Seefried, Jr.
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Patent number: 5690701Abstract: Continuous process for the manufacture of solid alkali metal persalt particles coated by crystallization of a supersaturated aqueous solution of persalts and covering of the persalt particles in a post-crystallization vessel into which at least one coating agent is introduced and in which crystallization of the coating agent around the persalt particles is carried out under controlled temperature and stirring conditions.Type: GrantFiled: September 21, 1995Date of Patent: November 25, 1997Assignee: SOLVAY Interox (Societe Anonyme)Inventors: Stefano Bigini, Romano Pardini, Soraya Parvaneh
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Patent number: 5650141Abstract: This invention provides a deodorant cosmetic stick product which has a translucent or transparent light transmitting appearance. The cosmetic stick has a content of ingredients such as sodium bicarbonate, propylene glycol, sodium stearate, Steareth-100, Pentadoxynol-200, and water. An invention deodorant cosmetic stick has excellent esthetics when applied underarm, such as smoothness and a comfortable dry feel, and without a visually perceptible residue.Type: GrantFiled: September 13, 1995Date of Patent: July 22, 1997Assignee: Church & Dwight Co., Inc.Inventors: Wolfgang R. Bergmann, Richard T. Murphy, Linda J. Lancaster
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Patent number: 5628990Abstract: This invention provides cosmetic deodorant stick, roll-on and cream formulations. An invention deodorant product comprises an organic matrix having a dispersed solids phase which includes discrete crystallites of bicarbonate salt ingredient and particulate boron oxide desiccant ingredient. When an invention deodorant product is applied to a skin surface, the boron oxide reacts with moisture, and converts to boric acid which neutralizes any content of a strong basic irritant such as alkali metal carbonate which is present as an impurity in an alkali metal bicarbonate salt.Type: GrantFiled: October 25, 1995Date of Patent: May 13, 1997Assignee: Church & Dwight Co., Inc.Inventors: Richard T. Murphy, Wolfgang R. Bergmann
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Patent number: 5582811Abstract: A stable blister free flexible graphite is formed in accordance with the present invention by performing two chemical reactions including a first step of high temperature heat treatment which converts the active carbon surface from hydrophilic to hydrophobic and generates active surface sites and a second step of exposing the heat treated graphite to a stabilizing reagent for stabilizing the active sites generated by the first step of high temperature heat treatment.Type: GrantFiled: September 22, 1995Date of Patent: December 10, 1996Assignee: UCAR Carbon Technology CorporationInventors: Ronald A. Greinke, Richard I. Bretz
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Patent number: 5567406Abstract: Disclosed is a method of manufacturing potassium sulfite from a potassium hydroxide feedstock. A feedstock is tested for the presence of iron and, if the feedstock contains less than 0.3 ppm of iron, it is reacted with sulfur dioxide in an aqueous solution to form potassium sulfite. Alternatively, potassium sulfite that has a yellow or brownish color can be decolorized by adding about 0.02 to about 0.8 wt % hypophosphorous acid to it.Type: GrantFiled: May 11, 1995Date of Patent: October 22, 1996Inventors: Robert L. Zeller, III, David L. Johnson
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Patent number: 5514357Abstract: A method for producing a stabilized magnesium hydroxide slurry comprising physically deflocculating the magnesium hydroxide solids in a starting slurry to produce a stabilized magnesium hydroxide slurry. Depending on the chloride level of the starting slurry, a cationic polymer may be added to the slurry. Optionally a thickening agent may be added to the deflocculated slurry. Also disclosed is a stabilized magnesium hydroxide slurry produced by the method which may be transported and stored without substantial agglomeration of the magnesium hydroxide solids.Type: GrantFiled: April 15, 1993Date of Patent: May 7, 1996Assignee: Martin Marietta Magnesia Specialties Inc.Inventors: Alvin Richmond, Robert J. Gutowski
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Patent number: 5501733Abstract: Fluoridated particulates, especially external face surface-fluoridated particulates of the rare earth metal sesquisulfide pigments/colorants, advantageously encapsulated within a coating layer of at least one transparent oxide or hydrate thereof, e.g., silica, have improved chromatic properties and are well suited for the coloration/pigmentation of a wide variety of materials and substrates, for example paints, plastics, resins, varnishes, rubbers, ceramics, glazes, papers, inks, leathers, cosmetics, dyes, coatings, etc.Type: GrantFiled: June 9, 1994Date of Patent: March 26, 1996Assignee: Rhone-Poulenc ChimieInventors: Pierre Macaudiere, Jorge Morros, Jean-Michel Tourre, Alain Tressaud
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Patent number: 5486365Abstract: The object of the present invention is to prepare a calcium hydrogen phosphate that has excellent binding properties, a large oil adsorption capacity and a specific surface area, and is therefore suitable as an excipient.A scale-like calcium hydrogen phosphate is prepared by reacting phosphoric acid with an alkaline calcium compound such as quick lime, in the presence of a multivalent organic acid with coordinating ability, such as citric acid, to obtain a columnar calcium hydrogen phosphate, and then hydrothermally treating the obtained columnar calcium hydrogen phosphate at a temperature of 60.degree. C. or higher.Type: GrantFiled: July 8, 1994Date of Patent: January 23, 1996Assignee: Fuji Chemical Industry Co., Ltd.Inventors: Kanemasa Takado, Tatsuo Murakami
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Patent number: 5441713Abstract: The tendency of aqueous solutions of urea and other NH-containing compositions to force instability of hardness factors has been found to be detrimental to processes and apparatus employing them. The reliability of these processes and apparatus is improved by the inclusion of hardness-suppressing compositions, which preferably include both a water-soluble polymer and a phosphonate. In particular, agricultural and NO.sub.x -reducing applications are improved, especially for solutions containing urea hydrolysis products and the salts of them.Type: GrantFiled: October 3, 1991Date of Patent: August 15, 1995Assignee: Nalco Fuel TechInventors: Leonard Dubin, W. Robert Epperly, Barry N. Sprague, Thure von Harpe
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Patent number: 5427755Abstract: In the process for the preparation of dicalcium phosphate dihydrate, which has a good compatibility with fluorine and stability to hydrolysis and causes the minimum possible after-thickening when used in tooth-pastes, by reaction of calcium carbonate suspended in water with an aqueous solution of orthophosphoric acid, precipitation of dimagnesium phosphate trihydrate, as a stabilizer, by reaction of aqueous solutions of a magnesium salt and of orthophosphoric acid in the presence of a basic compound and final filtration, drying and grinding of the precipitate, 0.2 to 0.8% by weight of polyphosphoric acid, calculated with respect to the dicalcium phosphate dihydrate precipitated in the reaction mixture, is added to the reaction mixture as a further stabilizer.Type: GrantFiled: February 17, 1994Date of Patent: June 27, 1995Assignee: Hoechst AktiengesellschaftInventors: Franz-Josef Dany, Gerhard Kalteyer, Gerhard Nolte, Hedwig Prell
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Patent number: 5415803Abstract: A novel composition of matter comprises a stable solution of elemental bromine and urea in water.Type: GrantFiled: April 28, 1993Date of Patent: May 16, 1995Assignee: Bromine Compounds, Inc.Inventor: Leonard Shorr
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Patent number: 5356606Abstract: A composition having improved physical stability comprising an aqueous peroxidic solution of an alkali metal oxyboron compound containing alkali metal to boron in a substoichiometric mole ratio into which there has been introduced an effective stabilizing amount of cyclohexane -1,2-diaminotetra (methylene phosphonic acid) or a water soluble salt thereof. Also a process for enhancing the physical stability of an aqueous peroxidic solution of an alkali metal oxyboron compound containing alkali metal to boron in a substoichiometric mole ratio which is characterized by introducing into the solution an effective stabilizing amount of cyclohexane -1,2-diaminotetra (methylene phosphonic acid) or a water soluble salt thereof.Type: GrantFiled: April 27, 1993Date of Patent: October 18, 1994Assignee: Solvay Interox LimitedInventors: Graham R. Horne, Nicholas A. Troughton
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Patent number: 5354938Abstract: The surface properties of hydrofluoric acid are modified by the addition of a perfluoro compound in order to reduce the tendency of the HF to form an aerosol upon any release of HF alkylation acid from an HF alkylation unit. The perfluoro compounds which are used are the perfluorosulfonic acid fluorides and perfluorocarboxylic acid fluorides.Type: GrantFiled: June 21, 1991Date of Patent: October 11, 1994Assignee: Mobil Oil CorporationInventors: Costandi A. Audeh, Saverio G. Greco
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Patent number: 5352424Abstract: An aluminum nitride powder that has substantially no ammonia odor after exposure to atmospheric moisture is obtained by admixing the powder with a gettering compound that sublimes or decomposes at a temperature below 500.degree. C. The gettering compound is a C.sub.1 -C.sub.11 aliphatic carboxylic mono- or polyfunctional acid, an anhydride or an ester of such an acid or an anhydride of an aromatic carboxylic acid.Type: GrantFiled: February 16, 1993Date of Patent: October 4, 1994Assignee: The Dow Chemical CompanyInventors: Kevin E. Howard, John R. Moyer
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Patent number: 5348581Abstract: Unique compositions based on at least one crystalline rare earth sesquisulfide, well suited for the coloration of a wide variety of substrates, e.g., cosmetics, plastics, paints and rubbers, contain a dopant amount of at least one alkali/alkaline earth metal, at least a fraction of which being included within the crystal lattice of such at least one rare earth sesquisulfide.Type: GrantFiled: December 4, 1992Date of Patent: September 20, 1994Assignee: Rhone-Poulenc ChimieInventors: Thierry Chopin, Herve Guichon, Olivier Touret
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Patent number: 5338522Abstract: Solutions of an hydroxylamine or an at least partially neutralized hydroxylamine salt are stabilized against decomposition by adding thereto a mercaptobenzothiazole, a mercaptothiazoline, a thiuram disulfide, thiourea or a mercaptoalkanol.Type: GrantFiled: December 21, 1992Date of Patent: August 16, 1994Assignee: Cytec Technology Corp.Inventor: Howard I. Heitner
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Patent number: 5338473Abstract: Beta cobaltous hydroxide is synthesized by decomposing the complex formed between cobaltous ions and a suitable complexing agent under hydrothermal conditions. Cobaltous ion and complexing agent are combined in an aqueous medium, wherein the molar ratio of the cobaltous ion to the complexing agent is about one or more. Hydroxide ion is added, wherein the molar ratio of hydroxide ion to cobaltous ion is more than about 2. The resulting admixture is heated under hydrothermal conditions for precipitating beta cobaltous hydroxide. The method provides improved control over the size and shape of the beta cobaltous hydroxide reaction product. The beta cobaltous hydroxide can be reduced to form magnetic particles of cobalt metal.Type: GrantFiled: March 11, 1993Date of Patent: August 16, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventor: Jean A. Lown
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Patent number: 5308600Abstract: Process for conditioning waste sulfuric acid which is prone to precipitation of tars or resins, which comprises adding emulsifiers, preferably long-chain polyethers, to the waste sulfuric acid.Type: GrantFiled: October 23, 1992Date of Patent: May 3, 1994Assignee: Hoechst AktiengesellschaftInventors: Helmold von Plessen, Wolfram Fritsche-Lang, Horst Lorke
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Patent number: 5286284Abstract: The invention provides a compound of the formula[NH.sub.2 NH.sub.2 ].sub.a [C.sub.6 H.sub.3 (COOH) (SO.sub.3 H) (OH)].sub.bwhereina is 1 andb is from 1 to 2.The compound is useful for stabilizing tin (II) compounds against oxidation, in particular in the electrolytic coloring of aluminum or aluminum alloys.Type: GrantFiled: December 16, 1992Date of Patent: February 15, 1994Inventor: Erich Ruf
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Patent number: 5277886Abstract: The addition of a nucleating or coalescing agent (e.g., urea) to liquid ammonia reduces the size and persistence of a deadly, fog-like cloud of ammonia droplets that tend to form when liquid ammonia is accidentally released to the atmosphere. In addition, high purity ammonia is obtained by evaporating ammonia from the ammonia- and nucleating agent-containing composition.Type: GrantFiled: March 31, 1992Date of Patent: January 11, 1994Assignee: Union Oil Company of CaliforniaInventor: Donald C. Young
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Patent number: 5238674Abstract: A fluorine-doped tin oxide powder is prepared by combining a solution of a stannic salt with a solution of a fluoride, separating the tin hydroxide from the liquid and drying it at a temperature not exceeding about room temperature and heating the dried product to at least 500.degree. C., until the fluorine content is less than 10% and preferably is between 1 and 5% by weight. The fluorine-doped tin oxide powder of the invention can be used for the manufacture of electrically conductive toner powder.Type: GrantFiled: February 5, 1991Date of Patent: August 24, 1993Assignee: Oce-Nederland B.V.Inventors: Gerardus C. P. Vercoulen, Ronald Groothuijse
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Patent number: 5227146Abstract: Solutions of an hydroxylamine or an at least partially neutralized hydroxylamine salt are stabilized against decomposition by adding thereto a mercaptobenzothiazole, a mercaptothiazoline, a thiuram disulfide, thiourea or a mercaptoalkanol.Type: GrantFiled: May 23, 1991Date of Patent: July 13, 1993Assignee: American Cyanamid CompanyInventor: Howard I. Heitner
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Patent number: 5206385Abstract: Urea-hydrogen peroxide-polyvinylpyrrolidone (PVP) in the form of a free-flowing powder is stable against decomposition in water and alcohol solvents. The product is obtained by spraying an aqueous solution of urea-hydrogen peroxide onto a fluidized bed of PVP and drying; it contains about 5%-20% by weight H.sub.2 O.sub.2 and less than about 5% water. The urea-hydrogen peroxide solution is applied onto the fluidized PVP bed at a predetermined rate, suitably about 0.5-30 g of solution/minute/kg PVP in the bed, and, preferably, about 1-3 g/min/kg PVP.Type: GrantFiled: July 2, 1992Date of Patent: April 27, 1993Assignee: ISP Investments Inc.Inventors: Robert B. Login, John J. Merianos, Russell B. Biss, Paul Garelick
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Patent number: 5200164Abstract: Carbon blacks treated with a treating agent comprising at least one compound containing at least one long chain alkenyl or alkyl group and at least one amine group. Optionally, the compound contains at least one chemical group for linking the long chain alkenyl or alkyl group with the amine group. Also disclosed are ink compositions incorporating the treated carbon blacks and processes for preparing the compositions.Type: GrantFiled: December 12, 1990Date of Patent: April 6, 1993Assignee: Cabot CorporationInventors: Avrom I. Medalia, Eva M. Breckner, James A. Belmont
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Patent number: 5188735Abstract: The rare earth values contained in an aqueous solution of the nitrates of at least two rare earth elements are conveniently separated by first liquid/liquid extracting such aqueous nitrate solution with a liquid organic phase containing a P(O)R.sub.1 R.sub.2 R.sub.3 organophosphorus extractant.Type: GrantFiled: February 21, 1991Date of Patent: February 23, 1993Assignee: Rhone-Poulence ChimieInventors: Thierry Delloye, Jean-Louis Sabot
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Patent number: 5183901Abstract: Urea-hydrogen peroxide-polyvinylpyrrolidone (PVP) in the form of a free-flowing powder is stable against decomposition in water and alcohol solvents. The product is obtained by spraying an aqueous solution of urea-hydrogen peroxide onto a fluidized bed of PVP and drying; it contains about 5%-20% by weight H.sub.2 O.sub.2 and less than about 5% water. The urea-hydrogen peroxide solution is applied onto the fluidized PVP bed at a predetermined rate, suitably about 0.5-30 g of solution/minute/kg PVP in the bed, and, preferably, about 1-3 g/min/kg PVP.Type: GrantFiled: January 24, 1992Date of Patent: February 2, 1993Assignee: ISP Investments Inc.Inventors: Robert B. Login, John J. Merianos, Russell B. Biss, Paul Garelick
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Patent number: 5147622Abstract: The invention relates to a method for the stabilization of phosphorus trichloride, wherein one or more derivatives of dithiocarbamic acids are added to the phsophorus trichloride. As derivatives, salts, esters or thiuram sulfides of the dithiocarbamic acids, individually or as a mixture, are preferred. The amounts used generally fall within the range of 10.sup.-4 % to 10.sup.-2 %, based on the amount of phosphorus trichloride. Derivatives, which are only slightly soluble in phosphorus trichloride are advantageously used in amounts of more than 10.sup.-2 %. Due to the inventive addition of derivatives of dithiocarbamic acids, the formation of phosphorus oxychloride in the phosphorus trichloride is delayed significantly and reduced to a minimum value.Type: GrantFiled: March 6, 1991Date of Patent: September 15, 1992Assignee: Chemie AG Bitterfeld-WolfenInventor: Rudolf Schumann
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Patent number: 5147621Abstract: The invention relates to a method for stabilizing phosphorus trichloride. In order to delay the formation of phosphorus oxychloride in phosphorus trichloride and to reduce it to a minimum value which no longer adversely affects further processing, one or more amines which have at least two aromatic hydrocarbon groups linked to one nitrogen atom, such as diphenylamine, phenothiazine, phenyl-4-methylphenylamine and triphenylamine, are added to the phosphorus trichloride. The amines can also be added in the form of their salts, including their quaternary ammonium compounds, or their reaction products with phosphorus halides. The amounts of amines, added fall within the range of 10.sup.-6 % to 10.sup.-1 %, based on the amount of phosphorus trichloride.Type: GrantFiled: March 6, 1991Date of Patent: September 15, 1992Assignee: Chemie AG Bitterfeld-WolfenInventor: Rudolf Schumann
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Patent number: 5141730Abstract: Solutions of an hydroxylamine or an at least partially neutralized hydroxylamine salt are stabilized against decomposition by adding thereto a water-soluble alkali metal, alkaline earth metal or ammonium thiosulfate.Type: GrantFiled: May 23, 1991Date of Patent: August 25, 1992Assignee: American Cyanamid CompanyInventor: Howard I. Heitner
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Patent number: 5114698Abstract: A method of stabilizing sodium dithionite is disclosed which comprises exposing a quantity of sodium dithionite to a quantity of amino material under pressure, wherein the partial pressure of amino material is at least 0.5 atmospheres.Type: GrantFiled: August 15, 1990Date of Patent: May 19, 1992Assignee: Hoechst Celanese CorporationInventors: Donald M. Oglesby, George E. Wells, IV