Amine, Amide, Azo, Or Nitrogen-base Radical Containing Patents (Class 252/390)
-
Patent number: 6059992Abstract: Corrosion in aqueous alkanolamine, physical solvents, or combination of alkanolamine and physical solvent solutions used to remove acid gases from natural gas, synthetic gas, or light hydrocarbon streams can be reduced by addition of mixtures of oxygen scavengers or mixtures of oxygen scavengers and sodium molybdate. The oxygen scavengers must be promoted to reduce metal surfaces in contact with the solutions to a more passive, harder, and insoluble form at the operating temperature of the treating system. The sodium molybdate provides additional passivation especially in the imperfections on the surface of the metal where corrosion accelerates.Type: GrantFiled: October 14, 1997Date of Patent: May 9, 2000Inventors: Ray R. Veldman, David O. Trahan
-
Patent number: 6056896Abstract: The present invention provides an improved metal corrosion inhibitor for use in aqueous acid solutions which is relatively non-toxic and inexpensive. The corrosion inhibitor is a mixture comprised of oligomerized aromatic amines prepared by contacting the still bottoms residue produced in the distillation of quinoline from coal tar with oxygen in the presence of a catalyst.Type: GrantFiled: May 28, 1998Date of Patent: May 2, 2000Assignee: Halliburton Energy Services, Inc.Inventor: Michael M. Brezinski
-
Patent number: 6045723Abstract: The subject matter of this invention is directed to compositions and compounds to minimize hydrogen charging and hydrogen induced cracking of steels comprising, in one embodiment, a propylene diamine compound and in another a carrier and propylene diamines. Preferably, the composition of that embodiment is comprised of a hydrocarbon carrier and 1,3 propylene diamines. Alternatively, compositions of the present invention may be comprised of a carrier and octadecyl trimethyl ammonium bromide. In addition, where the environment dictates, the composition of the present invention may be comprised of a carrier, at least one 1,3 propylene diamine and octadecyl trimethyl ammonium bromide.Type: GrantFiled: October 29, 1998Date of Patent: April 4, 2000Inventors: Russell D. Kane, Michael S. Cayard
-
Patent number: 6042750Abstract: A composition for inhibiting corrosion of metal is described, wherein the composition comprises at least one tetraalkylammonium halide, at least one alkyldiamine, at least one polyethylene aliphatic hydrocarbon amine, at least one polyethylene fatty acid ester, at least one aliphatic hydrocarbon hydroxyalkyl imidazoline, at least one polyethylene glycol aliphatic ester, and at least one trialkanolamine, and at least one amine oxyalkylate.Type: GrantFiled: April 17, 1999Date of Patent: March 28, 2000Assignee: Joan DocterInventor: James O. Burlew
-
Patent number: 6022401Abstract: Several copolymers of aspartic acid and another monomer provide effective mild steel corrosion inhibitors and scale formation inhibitors under oil field conditions. The copolymers are polymers of modified polyaspartic acid mer units and polyaspartic acid mer units. The resulting polymers are biodegradable.Type: GrantFiled: April 17, 1998Date of Patent: February 8, 2000Assignee: Nalco Chemical CompanyInventors: Jiansheng Tang, Shi-Liang Fu, Daniel H. Emmons
-
Patent number: 5993693Abstract: Zwitterionic water-soluble imine corrosion inhibitors of the general formula: ##STR1## wherein R.sup.3 is an anionically charged group. Preferred zwitterionic imines are the reaction products of the Michael addition of acrylic acid to an imine.Type: GrantFiled: November 9, 1998Date of Patent: November 30, 1999Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventor: G. Richard Meyer
-
Patent number: 5976887Abstract: A novel electrochemiluminescent (ECL) reaction between diaminoaromatic ligands and soluble metal ions, specifically reactions between aminoaromatic ligands, such as 2,4-diaminotoluene (2,4,DAT), 3,4-diaminotoluene (3,4,DAT) and 2,3-diaminonaphthalene (2,3-DAN) and metal ions such as Au(I), Cu(II), Cr(VI), Fe(III), Ru)III), Se(IV) and V(V). Such reactions form the basis for ECL assays in detection of various substances, such as the reactants. The ECL interaction between these substances can also form the basis for binding methods in the detection of other substances, such as nucleic acids and antibodies wherein the metal ion ligand ECL complex may be used as a label. The ECL assays are considered useful for carrying out field and laboratory analyses for the detection of TNT breakdown products and toxic metals in wastewater streams, soil, and ground water supplies.Type: GrantFiled: June 2, 1997Date of Patent: November 2, 1999Assignee: Applied Research Associates, Inc.Inventors: John G. Bruno, Jimmy C. Cornette
-
Patent number: 5968408Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Specific isomers of chloro-methylbenzotriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.Type: GrantFiled: June 24, 1998Date of Patent: October 19, 1999Assignee: BetzDearborn Inc.Inventors: Sydia B. Anderson, Longchun Cheng, Michael A. Cady
-
Patent number: 5961885Abstract: A corrosion inhibitor comprising a dispersant, an imidazoline, an amide, an alkyl pyridine and a heavy aromatic solvent. The resultant blend effectively inhibits corrosion of flow lines containing low pH mixtures of hydrocarbons, water, and acid gases.Type: GrantFiled: January 12, 1999Date of Patent: October 5, 1999Assignee: Champion Technologies, Inc.Inventors: Paul Eaton, Sumeet Kanwar
-
Patent number: 5958115Abstract: The invention relates to a corrosion-inhibiting material comprising a composite containing a metal oxide gel, where necessary modified by an organic polymer, and one or more corrosion inhibitors, and to a method for the production thereof. The corrosion-inhibiting composite material is used for producing corrosion-protective packaging material, for coating metallic and metallized articles as well as for corrosion protection in confined environments.Type: GrantFiled: February 24, 1998Date of Patent: September 28, 1999Assignees: EXCOR Korrosionsschutz-Technolgien und--Produkte GmbH, Feinchemie GmbH SebnitzInventors: Horst Bottcher, Karl-Heinz Kallies, Georg Reinhard, Gerhard Hahn
-
Patent number: 5939362Abstract: A method of inhibiting corrosion of iron and steel alloys in contact with oil-in-brine emulsions is claimed. The method comprises treating the oil-in-brine emulsions with an effective amount of a water soluble polymer having an average molecular weight of at least one million and an effective amount of a nitrogen-containing corrosion inhibitor.Type: GrantFiled: October 27, 1997Date of Patent: August 17, 1999Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventors: John D. Johnson, Shi-Liang Fu, Matthew J. Bluth, Robert A Marble
-
Patent number: 5935487Abstract: The addition of an effective amount of a liquid modified diethanolamide to a calcium chloride composition, which can be a brine solution or a solid, reduces the amount of corrosion of metals by the resulting composition. The calcium chloride/diethanolamide composition can be used as a deicer composition.Type: GrantFiled: August 4, 1998Date of Patent: August 10, 1999Assignee: General Chemical CorporationInventors: John Scott Beazley, William Edward Sadar, Douglas Robert Maynes, Mark G. Jantzen
-
Patent number: 5916483Abstract: Additives are disclosed which inhibit the corrosion of metals in construction materials which contain an inorganic binder. The inventive corrosion inhibitors contain a reaction product of amines and acids or they consist of such a reaction product. Said saltlike corrosion inhibitors upon use do not develop any undesired fragrance, and they furthermore do not bring along any health risks for the persons who are working with said substances. Through the adding of the inventive corrosion inhibitors, furthermore the properties of the construction material during its preparation and also during its use can be improved. In corresponding processes for inhibiting the corrosion of metals which are in contact with the construction materials, like e.g. metal armings, the corrosion inhibitors are usually added in an amount of 0.01% by weight to 10% by weight of said reaction product, referred to the inorganic binder which is contained in such material.Type: GrantFiled: October 21, 1996Date of Patent: June 29, 1999Assignee: Sika AG, vorm, Kaspar Winkler & Co.Inventors: Theodor A. Burge, Urs Mader
-
Patent number: 5904990Abstract: Until recently, conducting polymers have been used as protective coatings. lthough these types of polymers appear to be effective in most cases, problems have resulted when attempting to bind these polymers to an aluminum surface. The polymers of this invention adhere extremely well to aluminum and aluminum alloys and thus, provide a very effective form of corrosion protection.Type: GrantFiled: March 13, 1998Date of Patent: May 18, 1999Assignee: The United States of America as represented by the Secretary of the NavyInventors: John D. Stenger-Smith, Melvin H. Miles, William P. Norris, John Nelson, Peter Zarras, John W. Fischer, Andrew P. Chafin
-
Patent number: 5902515Abstract: A corrosion inhibitor comprising a dispersant, an imidazoline, an amide, an alkyl pyridine and a heavy aromatic solvent. The resultant blend effectively inhibits corrosion of flow lines containing low pH mixtures of hydrocarbons, water, and acid gases.Type: GrantFiled: August 16, 1995Date of Patent: May 11, 1999Assignee: Champion Technologies, Inc.Inventors: Sumeet Kanwar, Paul Eaton
-
Patent number: 5891225Abstract: A method for applying halide brine to surfaces requiring protection against freeze conditions, inhibition of snow and ice accumulating, deicing or freeze retardation, for example, or dust control with limited corrosion is disclosed, the method comprising the steps of forming an admixture of polyhydroxy carboxylate and polyalkoxylated amine dispersed in an halide brine solution in an amount effective to inhibit corrosion; and applying the admixture to surfaces. The method of this invention can be used to limit corrosion in the application of a halide brine to surfaces of dust-producing materials as well as surfaces requiring protection against freeze conditions.Type: GrantFiled: January 23, 1998Date of Patent: April 6, 1999Assignee: Tetra Technologies IncInventors: Surendra K. Mishra, David J. Hanlon, Nam-Sook Bae
-
Patent number: 5885487Abstract: The corrosion of metals in contact with aqueous alkanolamine solution in acid gas removal units is inhibited by maintaining in the alkanolamine solution a corrosion inhibiting amount of a compound having the formula: ##STR1## where R is S or O, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently H, C.sub.1 to C.sub.8 alkyl, C.sub.1 to C.sub.8 alkenyl, C.sub.6 to C.sub.10 aryl, C.sub.7 to C.sub.12 alkaryl, C.sub.7 to C.sub.12 aralkyl, C.sub.3 to C.sub.10 cycloalkyl, C.sub.1 to C.sub.8 thiophene, or amino groups. The alkanedithiol is useful for inhibiting the corrosion of metals in both the acid gas rich and lean portions of the acid gas removal unit.Type: GrantFiled: August 22, 1997Date of Patent: March 23, 1999Assignee: BetzDearborn Inc.Inventor: Ljiljana V. Minevski
-
Patent number: 5874026Abstract: A method of use of a composition including either or both isomers of hydrogenated methylbenzotriazole, namely, 5-Methyl-1H-Benzotriazole or 4-Methyl-1H-Benzotriazole which have been at least about 50% hydrogenated, to form corrosion inhibiting films on metal surfaces in an aqueous environment. The hydrogenated methylbenzotriazole compositions provide both improved passivation and improved film persistence when charged to aqueous industrial systems either on a continuous or on an intermittent basis. Continuous dosing is generally kept at a constant >0.5, typically 1-2 ppm in the aqueous system to be treated; intermittent doses are generally 10-20 ppm once every week or two or more.Type: GrantFiled: December 1, 1997Date of Patent: February 23, 1999Assignee: Calgon CorporationInventors: John P. Pilsits, Jr., Ann M. Cognetti, Jasbir S. Gill
-
Patent number: 5866032Abstract: A composition for of controlling scale formation and deposition and corrosion in aqueous systems is described wherein a treatment solution of a substoichiometric amount of a composition comprising a scale/corrosion inhibitor in combination with a substituted alkylpolycarboxylate is employed. The scale/corrosion inhibitor can be a phosphonate such as hydroxyethylidene diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyphosphonoacetic acids, amino phosphonates; terpolymers, copolymers and homopolymers of acrylic acid, maleic acid, epoxysuccinic acids such as polyepoxysuccinic acid or mixtures thereof. The substituted alkylpolycarboxylates are compounds of the general structure: R--X.sub.m --Y.sub.n wherein R is a hydrocarbon functionality having 4 to 18 carbons; X, when present, is --NH--, --NY.sup.1 --, --N-->O, --N--OC--Y.sup.1, --O-- or --S--; n is greater than or equal to 1; m=O or 1; and Y and Y.sup.Type: GrantFiled: November 18, 1997Date of Patent: February 2, 1999Assignee: BetzDearborn Inc.Inventors: William S. Carey, Libardo A. Perez, Donald T. Freese, Judith L. Barron
-
Patent number: 5863463Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.Type: GrantFiled: February 27, 1998Date of Patent: January 26, 1999Assignee: BetzDearborn Inc.Inventors: David W. Reichgott, Sydia B. Anderson, Michael A. Cady, Roger C. May, Anita G. Monino
-
Patent number: 5863464Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.Type: GrantFiled: June 10, 1998Date of Patent: January 26, 1999Assignee: BetzDearborn Inc.Inventors: David W. Reichgott, Sydia B. Anderson, Michael A. Cady, Roger C. May, Anita G. Monino
-
Patent number: 5858074Abstract: Known organic solderability preservatives (OSP) contain an azole compound and are applied on a copper surface from an acidic solution. The OSPs are not visible to the naked eye when applied. A number of dyes compatible with the OSP solution and not interfering with solderability has been identified. The composition containing such a dye can produce a layer which is visible to the naked eye when applied even in a thin layer. The suitable dyes contain a cationic imine group having the general formula ##STR1## where X.sup.- is an anion such as chloride, iodide, sulphate, etc., or an organically bonded anionic group such as sulphonate.Type: GrantFiled: July 29, 1997Date of Patent: January 12, 1999Assignee: National Research Council of CanadaInventors: Kenneth C. Cole, Eric Pellerin
-
Patent number: 5853462Abstract: A metal article is protected from corrosion under prolonged exposure to normal ambient atmospheric conditions which cause such corrosion by coating the metal article with an adherent organic coating which does not exude corrosive acid, which comprises an effective amount of an aromatic amine compound containing a p-phenylenediamine moiety which is not an epoxy crosslinking agent but which is capable of being oxidized in air, an air oxidation product thereof, or a mixture of the amine and air oxidation product for corrosion protection of the metal article, before the coated metal article is placed in contact with such atmospheric conditions which cause such corrosion.Type: GrantFiled: October 30, 1996Date of Patent: December 29, 1998Assignee: Akzo Nobel NVInventors: Peter J. Spellane, Francis A. Via, Edward D. Weil
-
Patent number: 5840207Abstract: The addition of an effective amount of a liquid modified diethanolamide which is suitably a reaction product of cocoamide and phthalic anhydride to a calcium chloride composition, which can be a brine solution or a solid, reduces the amount of corrosion of metals by the resulting composition. The calcium chloride/diethanolamide composition can be used as a deicer composition.Type: GrantFiled: August 22, 1996Date of Patent: November 24, 1998Assignee: General Chemical CorporationInventors: John Scott Beazley, William Edward Sadar, Douglas Robert Maynes, Mark G. Jantzen
-
Patent number: 5785896Abstract: A method of combating corrosion of a metal which comprises contacting such metal with a composition containing polyamino acids, their salts and their anhydrides, together with at least one corrosion inhibitor selected from the group consisting of benzotriazole, 4-C.sub.1 -C.sub.4 -alkylbenzotriazoles and 5-C.sub.1 -C.sub.4 -alkylbenzotriazoles.Type: GrantFiled: October 31, 1995Date of Patent: July 28, 1998Assignee: Bayer AktiengesellschaftInventors: Heinz-Joachim Rother, Franz Kunisch
-
Patent number: 5779939Abstract: Corrosion prevention compositions which contain lactobionic acid N-alkylamides, and further having a pH below 9.0, are described. In particular, lactobionic acid N-alkylamides in which the saturated or unsaturated alkyl group bonded via the amide function has a chain length of 8 to 18 carbon atoms show a good corrosion-inhibiting action. The use of lactobionic acid N-alkylamides in corrosion prevention compositions and metalworking compositions is also described.Type: GrantFiled: February 13, 1996Date of Patent: July 14, 1998Assignee: Solvay Deutschland GmbHInventors: Klaus-Guenter Gerling, Helge Rau, Kornelia Wendler, Petra Schwarz, Karlheinz Uhlig
-
Patent number: 5772919Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.Type: GrantFiled: January 3, 1997Date of Patent: June 30, 1998Assignee: BetzDearborn Inc.Inventors: David W. Reichgott, Sydia B. Anderson, Michael A. Cady, Roger C. May, Anita G. Monino
-
Patent number: 5766548Abstract: Control of formation of heat stable amine salts and of corrosion in an amine solvent treating system is accomplished by introduction of N,N-diethylhydroxylamine catalyzed with hydroquinone into the system. The catalyzed N,N-diethylhydroxylamine is effective at the temperature ranges of amine treating systems to effectively reduce formation of heat stable amine salts and to inhibit corrosion. The catalyzed N,N-diethylhydroxylamine is effective in proportions including the range of about 0.5 to about 6 parts N,N-diethylhydroxylamine to 1 part hydroquinone.Type: GrantFiled: March 31, 1997Date of Patent: June 16, 1998Assignee: Cata Chem Inc.Inventor: John Soria
-
Patent number: 5764717Abstract: An improved method for removing scale, sludge, corrosion and other debris and deposits from the interior of a heat exchanger vessel such as a nuclear steam generator, includes generating pressure pulses in a non-corrosive, strongly basic, amine-containing chemical cleaning agent in aqueous solution after the agent has been introduced into the interior of the vessel to create shock waves in the liquid for dislodging, dissolving and fluidizing sludge and corrosion products. The chemical cleaning agent is an aqueous solution containing at least one of the group of lower alkyl amines, e.g., dimethylamine, ethylamine, 1,2-diaminoethane, or diaminopropane, lower alkanol amines, e.g., ethanolamine, 2-methyl-2-amino-1-propanol, and 5-aminopentanol, lower alkoxy alkyl amines, e.g., 3-methoxypropylamine, and cyclic diimines, e.g., 1,10-phenanthroline, 2,9-dimethyl-1,10-phenanthroline, 4,7-dimethyl-1,10-phenanthroline, 2,2'-bipyridine, and 4,4'-bipyridine, and terpyridine, or combinations thereof.Type: GrantFiled: August 29, 1995Date of Patent: June 9, 1998Assignee: Westinghouse Electric CorporationInventor: Michael W. Rootham
-
Patent number: 5756004Abstract: The present invention provides improved quaternary ammonium compounds useful as metal corrosion inhibitors in aqueous acid solutions, methods of preparing the compounds, metal corrosion inhibited aqueous acid solutions containing the compounds and methods of protecting metal surfaces from acid corrosion using the compounds. The compounds are prepared by contacting the still bottoms residue produced in the distillation of quinoline from coal tar with oxygen to oligomerize aromatic amines contained therein and then reacting the oligomerized amines with a benzylhalide.Type: GrantFiled: May 13, 1997Date of Patent: May 26, 1998Assignee: Halliburton Energy Services, Inc.Inventor: Michael M. Brezinski
-
Patent number: 5750070Abstract: A biodegradable corrosion inhibitor, scale inhibitor and dispersant is provided. The inhibitor comprises one or more polymers from a family of poly(amino acid) polymers that include hydroxamic acid-containing sidechains. Methods of reducing corrosion and scale build-up and a method of dispersing solid particulates in a solution or slurry are provided by adding a polymer of the present invention to a solution or slurry.Type: GrantFiled: July 19, 1996Date of Patent: May 12, 1998Assignee: Nalco Chemical CompanyInventors: Jiansheng Tang, Raymond T. Cunningham, Bo Yang
-
Patent number: 5746971Abstract: A method of producing low volatility amines for power plant pH control by in-situ hydrolytic decomposition of a more volatile amine with a ring structure. A ring amine having a certain molecular weight and a volatility is introduced into the pressurized water reactor. The ring amine undergoes at least partial in-situ hydrolytic decomposition to produce at least one daughter amine. The daughter amine has a molecular weight equal to or greater than the ring amine and has a volatility less than the ring amine. The daughter amine, and the mixture of the daughter amine and the ring amine act to control the pH in the reactor. In an alternative embodiment, the ring amine undergoes complete decomposition to form at least one daughter amine, and the daughter amine(s) acts to control the pH in the reactor.Type: GrantFiled: January 24, 1997Date of Patent: May 5, 1998Assignee: Electric Power Research Institute, Inc.Inventors: Peter J. Millett, Alan D. Miller
-
Patent number: 5738980Abstract: Processing of color photographic materials can be accomplished using an aqueous redox amplifier composition comprising a color developing agent, an antioxidant therefor, hydrogen peroxide, and a stabilizing amount of nitrite ions to reduce dye loss during storage.Type: GrantFiled: August 14, 1997Date of Patent: April 14, 1998Assignee: Eastman Kodak CompanyInventors: Peter Jeffrey Twist, Christopher John Winscom
-
Patent number: 5714118Abstract: Corrosion of ferrous metal surfaces in an aqueous system, such as a boiler system, is inhibited by adding a first component and a second component, the first component being preferably carbohydrazide, hydrazine, or a salt thereof, the second component being selected from the group consisting of certain hydroxylamine compounds or mixtures thereof, preferably N,N-diethylhydroxylamine. The weight ratio of the added first component to the added second component is between about 4:1 and about 1:4.Type: GrantFiled: November 12, 1996Date of Patent: February 3, 1998Assignee: Applied Specialties, Inc.Inventor: Clarence Scheurman, III
-
Patent number: 5707553Abstract: A non-toxic solution to be used in the place of distilled or de-ionized water in autoclave sterilizers is disclosed. The solution renders the instruments placed in such sterilizers free of rust, spotting, and hastens the drying time of such instruments.Type: GrantFiled: July 25, 1995Date of Patent: January 13, 1998Inventors: Melvyn Lloyd Sawyer, Lennart Goof
-
Patent number: 5698504Abstract: There is provided a bleaching composition, suitable for use in a machine dishwashing method, containing: an oxygen-releasing bleaching agent, from 0.05% to 2.5% by weight, preferably 0.1% to 0.6% by weight of a paraffin oil, from 0.005% to 3%, preferably 0.02% to 1% and most preferably from 0.05% to 0.5% of a benzotriazole compound. Preferably the bleaching composition forms a part of a detergent composition.Type: GrantFiled: December 21, 1995Date of Patent: December 16, 1997Assignee: The Procter & Gamble CompanyInventors: Julie Ann Christie, Fiona Susan Macbeath, John Christopher Turner
-
Patent number: 5686016Abstract: The formation of amine or glycol degradation products in solutions used to remove acid gases or water from hydrocarbon or inert streams is reduced by adding to the solution an oxygen scavenger in which the effective component is an oxime of the formula: ##STR1## Mixed with a quinone promotor in which R.sub.1 and R.sub.2 are the same or different and are selected from hydrogen or lower alkyl groups of one to six carbon atoms. The addition of the quinone promotor increases the reactivity with oxygen at lower temperatures. The compound may also be as a corrosion inhibitor in gas treating or processing equipment.Type: GrantFiled: October 10, 1995Date of Patent: November 11, 1997Inventors: Ray R. Veldman, David Trahan
-
Patent number: 5646101Abstract: The present invention relates to a machine dishwashing composition containingfrom 1% to 80% of a detergent builder component other than carbonatefrom 0% to 9%, preferably 0% to 5%, most preferred 0% of alkali-metal carbonate or bicarbonate saltan oxygen-releasing bleaching agent such that the level of available oxygen measured according to the method herein is from 0.3 to 1.7, preferably 0.5 to 1.2,from 0.05% to 2.5%, preferably 0.1% to 0.6% of a paraffin oil, the rate of release of oxygen being preferably also controlled; the present invention also encompasses a process for making such compositions.Type: GrantFiled: October 20, 1995Date of Patent: July 8, 1997Assignee: The Procter & Gamble CompanyInventor: Fiona Susan MacBeath
-
Patent number: 5643493Abstract: The invention described herein is a corrosion inhibitor concentrate, and a method for preparation thereof, which may be formulated free of nitrites, nitrates, amines, and phosphates. The inhibitor concentrate is a "single part" synergistic combination of inhibitors, stabilizers, and antifoam agents, useful for reinhibition of recycled antifreeze/coolant. The inhibitor concentrate is efficacious for corrosion inhibition in coolants across a broad range of glycol quality. The inhibitor concentrate comprises specific amounts of water, triazole, alkali metal hydroxide, borate, alkali metal silicate, silicate stabilizer, and anti-foaming agent.Type: GrantFiled: March 13, 1996Date of Patent: July 1, 1997Assignee: The Dow Chemical CompanyInventors: Kevin C. Connor, Eric H. Hillier
-
Patent number: 5597514Abstract: A corrosion inhibitor formulation for use in reinforced concrete structures, the inhibitor reducing the rate of corrosion in metallic reinforcing rods placed within the structures. The formulation comprises a mixture of benzoic acid, aldonic acid, and a triazole such as benzotriazole or tolyltriazole.Type: GrantFiled: January 24, 1995Date of Patent: January 28, 1997Assignee: Cortec CorporationInventors: Boris A. Miksic, Christophe Chandler, Margarita Kharshan, Alla Furman, Barry Rudman, Larry Gelner
-
Patent number: 5589107Abstract: Corrosion of ferrous metal surfaces in an aqueous system, such as a boiler system, is inhibited by adding a first component and a second component, the first component being preferably carbohydrazide, hydrazine, or a salt thereof, the second component being selected from the group consisting of certain hydroxylamine compounds or mixtures thereof, preferably N,N-diethylhydroxylamine. The weight ratio of the added first component to the added second component is between about 4:1 and about 1:4.Type: GrantFiled: August 15, 1994Date of Patent: December 31, 1996Assignee: Applied Specialties, Inc.Inventor: Clarence Scheurman, III
-
Patent number: 5580462Abstract: An aqueous system containing scale forming salts including both calcium carbonate and calcium phosphate and characterized by high pH and high calcite concentrations which further contains a synergistic effective amount of a combination comprising (A) a polyether polyamino methylene phosphonate, and (B) a terpolymer comprising the monomers of acrylic acid, sulfophenomethallyl ether and maleic acid, is disclosed. A method for inhibiting the formation, deposition and adherence of such scale forming salts in the aqueous system employing the synergistic combination is also provided.Type: GrantFiled: October 6, 1995Date of Patent: December 3, 1996Assignee: Calgon CorporationInventor: Jasbir S. Gill
-
Patent number: 5556451Abstract: Compositions and methods of using the compositions to inhibit oxygen induced corrosion of metal exposed to aqueous solutions are disclosed. The compositions include hydroxybenzoic acid in formulations with imidazoline, heavy aromatic naphtha, polymerized tall oil fatty acid, alkanols, dimer trimer acids, alkanoic acid, alkanediols, and water. The compositions, when added to aqueous solutions, effectively inhibit oxygen induced corrosion of metal.Type: GrantFiled: July 20, 1995Date of Patent: September 17, 1996Assignee: Betz Laboratories, Inc.Inventor: Ljiljana V. Minevski
-
Patent number: 5554320Abstract: Microemulsion for all purpose hard surface cleaning compositions which contain an anticorrosion system designed to protect acid sensitive surfaces from attack by acidic materials.Type: GrantFiled: September 23, 1994Date of Patent: September 10, 1996Inventor: Georges Yianakopoulos
-
Patent number: 5531934Abstract: The present invention provides a method of inhibiting corrosion of ferrous metals in aqueous systems. The corrosion is inhibited by adding an effective amount of one or more poly(amino acids) to the aqueous system. Aqueous systems include for example water treatment systems and equipment used for detergent applications. The poly(amino acids) comprise a reaction product of at least one compound selected from amino acids, amic acids, ammonium salts of monoethylenically unsaturated dicarboxylic acids, ammonium salts of hydroxypolycarboxylic acids and combinations thereof.In one embodiment the poly(amino acids) are added to detergent solutions to inhibit corrosion in equipment for detergent applications. In another embodiment, corrosion inhibitors comprising one or more homopolymers of amino acids and one or more pyrophosphates are added to aqueous systems to inhibit corrosion.Type: GrantFiled: September 12, 1994Date of Patent: July 2, 1996Assignee: Rohm & Haas CompanyInventors: Michael B. Freeman, William M. Hann, Yi H. Paik, Graham Swift
-
Patent number: 5512212Abstract: A composition and method for inhibiting corrosion of iron and iron-containing metals in contact with aqueous systems containing sulfide compounds. The composition comprises (A) an aqueous solution of an alcohol, an acid, a fatty imidazoline, and an ethoxylated fatty diamine, and (B) an aqueous solution of a molybdate compound or salt thereof.Type: GrantFiled: January 17, 1995Date of Patent: April 30, 1996Assignee: Betz Laboratories, Inc.Inventors: J. Michael Brown, James R. Ohlsen, Richard D. McBride
-
Patent number: 5487846Abstract: A general-purpose organic rust initiator which can effectively prevent corrosion of metals comprising a compound of formula (1): ##STR1## wherein R.sub.1 is a perfluoroalkyl group having 1 to 6 carbon atoms; R.sub.2 is a hydrogen atom or a group defined for R.sub.1 ; R.sub.4 is an acid group selected from --OH, --COOH, --SH, --SO.sub.2 OH, --PO(OH).sub.2, --SCH.sub.2 COOH, --SO.sub.2 NHCH.sub.2 COOH or a salt thereof; R.sub.3 is a hydrogen atom or a group defined for R.sub.4 ; or R.sub.3 and R.sub.4 together form an acid group selected from --N.dbd.N--NH--, --CH.dbd.N--N--, --SO.sub.2 --NH--CO--, --S--C(SH).dbd.N-- or a salt thereof.Type: GrantFiled: October 4, 1994Date of Patent: January 30, 1996Assignee: Union Chemical Co., Ltd.Inventor: Shigeru Otomo
-
Patent number: 5486308Abstract: A composition for inhibiting corrosion. The composition contains a mixture of a dessicant and a vapor-corrosion inhibitor. The mixture of dessicant and inhibitor is synergistic: the service life of the corrosion inhibitor is signficiantly longer when so used than when used alone or in in the presence of but not physically mixed with the dessicant.Type: GrantFiled: April 4, 1994Date of Patent: January 23, 1996Assignee: A+ Corp.Inventor: Donald P. Mayeaux
-
Patent number: 5480576Abstract: A detergent composition which prevents tarnishing of silver and silver-plated articles comprising 1-20 weight percent of a peroxygen or hypohalite bleaching agent, 0.05 to about 10 weight percent of a 1,3-N azole compound, from 1 to 75 weight percent of a builder, and 0 to 40 weight percent of a surfactant is described, provided the pK.sub.a of the 1,3-N azole compound is lower than a pH of the aqueous solution of the composition. A method for preventing silver tarnishing of articles in an automatic dishwashing machine is also described.Type: GrantFiled: September 7, 1994Date of Patent: January 2, 1996Assignee: Lever Brothers Company, Division of Conopco, Inc.Inventors: Richard G. Gary, Petrus A. Angevaare
-
Patent number: RE36291Abstract: A method for inhibiting corrosion of metal surfaces in an aqueous medium, comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion, the corrosion inhibitor comprising a water-soluble agent selected from the group consisting of compositions of the formula ##STR1## compositions of the formula ##STR2## and mixtures thereof, wherein R is R.sup.2 .paren open-st.OCH.sub.2 CH.sub.2 .paren close-st..sub.x, wherein R.sup.2 is a substituted or unsubstituted alkyl, aryl, or aralkyl group of from about five to about fifteen carbon atoms, each carbon atom having at least one hydrogen and x is an integer of from about one to about ten, and R'N is a basic nitrogen compound that is at least water-dispersible.Type: GrantFiled: December 12, 1995Date of Patent: September 7, 1999Assignee: Baker Hughes IncorporatedInventor: Richard L. Martin