Oxygen Organic Compound Containing Patents (Class 252/392)
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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
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Patent number: 5958298Abstract: The anti-corrosive draining agent for use in a rinsing process includes a polyoxyalkylene alkyl ether as an essential component. The anti-corrosive draining agent further includes an amine compound as an essential component, wherein the polyoxyalkylene alkyl ether (a) and the amine compound (b) are contained in a blending weight ratio (a/b) of from 99/1 to 80/20. The rinsing process using water following a cleaning process, includes the steps of adding the above anti-corrosive draining agent to a rinsing water, and rinsing an object in the rinsing water.Type: GrantFiled: October 11, 1995Date of Patent: September 28, 1999Assignee: Kao CorporationInventors: Eiji Nagoshi, Kozo Kitazawa
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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
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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
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Patent number: 5904857Abstract: A method for removing dissolved oxygen from alkaline water containing dissolved oxygen at a temperature greater than 250.degree. F. which comprises the step of: adding to said alkaline water containing dissolved oxygen an effective oxygen-scavenging amount of a water-soluble semicarbazide of the formula ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of C.sub.1 -C.sub.10 alkyl, cycloalkyl, aryl, cycloalkyloxy and alkyloxy groups.Preferred materials are 4-phenyl semicarbazide, 4-isopropyl semicarbazide, 4-4-diethyl semicarbazide and carbazoyl morpholine. Below 400.degree. F., a catalyst is also required.Type: GrantFiled: April 17, 1997Date of Patent: May 18, 1999Assignee: Nalco Chemical CompanyInventor: Bruce R. Bailey
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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
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Patent number: 5891364Abstract: Compositions and methods relating to cementitious compositions are provided. The addition of an amidoamine that is the reaction product of polyalkylenepolyamines and short-chain alkanedioic acids or reactive derivatives thereof to cementitious compositions has been found useful in inhibiting the corrosion of ferrous metal articles in contact with said composition. The amidoamine is advantageously employed in combination with a hydrophobe compound that enhances corrosion inhibition. The invention also provides aqueous emulsions which contain the amidoamine, one or more hydrophobes, and an emulsifier for the hydrophobe.Type: GrantFiled: July 9, 1996Date of Patent: April 6, 1999Assignee: Geo Specialty Chemicals, Inc.Inventors: Michael J. Incorvia, Jr., Robert W. Chobin, Jr., Tim Hegge, Jr.
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Patent number: 5891919Abstract: A new compound, Denatonium Capsaicinate, and a method of producing the same are disclosed. Denatonium Capsaicinate provides an enhanced bitter and/or spicy, pungent flavor and may be used as an aversive agent, biocide, antifoulant and flavorant, for example. It is formed by reaction of a denatonium compound, Lidocaine or Lidocaine derivative with Capsaicin or a derivative thereof.Type: GrantFiled: September 19, 1997Date of Patent: April 6, 1999Assignee: Burlington Bio-Medical & Scientific Corp.Inventors: Melvin Blum, Michael Roitberg
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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
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Patent number: 5871691Abstract: A method and compounds for inhibiting and controlling corrosion is disclosed. The method is particularly effective at inhibiting or preventing corrosion of ferrous-based metals in contact with aqueous systems such as cooling water systems. The method comprises introducing into the aqueous system a compound of the general formula: ##STR1## wherein R is hydrogen, alkyl, aryl, substituted alkyl or substituted aryl; R' and R" are each independently hydrogen, C.sub.1-4 alkyl or C.sub.1-4 substituted alkyl; Z is O, S, NH, or NR, where R is as described above; n is a positive integer greater than 1; f is a positive integer; and M is hydrogen, a water soluble cation (e.g., NH.sub.4.sup.+, alkali metal), or a C.sub.1 -C.sub.3 alkyl group.Type: GrantFiled: September 27, 1995Date of Patent: February 16, 1999Assignee: BetzDearborn Inc.Inventors: William S. Carey, William C. Ehrhardt, Andrew Solov
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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
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Patent number: 5854180Abstract: Corrosion is inhibited in hydrochloric acid solutions used to acidize wells, by adding to the solutions a corrosion inhibiting composition comprising cinnamaldehyde or a substituted cinnamaldehyde together with a reaction product of a C.sub.3-6 ketone such as acetophenone, thiourea or a related compound, formaldehyde and hydrochloric acid.Type: GrantFiled: March 24, 1998Date of Patent: December 29, 1998Assignee: Clearwater, Inc.Inventors: Gary A. Scherubel, Robert Reid, Allen R. Fauke, Kevin Schwartz
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Patent number: 5854145Abstract: A package for facilitating the protection of metallic surfaces against corrosion and including a blend of corrosion inhibitor and surface-conditioning component such as a degreaser, descaler, and/or anti-static component in liquid state impregnated into a substrate such as a wipe for simultaneous and direct application to the surface of the article being protected. The corrosion inhibitor component is preferably an amine salt of carboxylic acid, triazole, an alkali metal salt of aldonic acid, or alkanolamine salts of fatty acids, an alkali metal or alkanolamine salt of aromatic sulfonic acid, or blends thereof. The substrate is preferably a wipe fabricated from a fabric such as soft cotton, but may also include other wipe materials such as woven or non-woven polyolefin fabric, or non-woven materials such as paper toweling.Type: GrantFiled: June 9, 1997Date of Patent: December 29, 1998Assignee: Cortec CorporationInventors: Christophe Chandler, Margarita Kharshan, Dan L. Dusing, Paul Jaeger
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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
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Patent number: 5830383Abstract: A method of treating an aqueous system is described which comprises incorporating in the system a hydroxylamine derivative of the general formula: ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 which may be the same or different represents hydrogen, alkyl of 1 to 8 carbon atoms or aryl or a water soluble salt thereof or a precursor thereof, and a tannin in a weight ratio of at least 2:1. This is particularly useful for boiler water systems.Type: GrantFiled: April 19, 1995Date of Patent: November 3, 1998Assignee: BetzDearborn Inc.Inventors: Brian Greaves, Stephen Clifford Poole, Chih Ming Hwa, Joseph Chwei-Jer Fan
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Patent number: 5814247Abstract: According to the invention, the solution contains a water-soluble salt of heptanoic acid and an oxidizing agent and, preferably, a wetting agent.By virtue of the combination of these compounds, low concentrations are sufficient to obtain satisfactory corrosion protection, which makes it possible to maintain a nonfatty surface appearance (on the treated sheet) and facilitates the treatment of the solution effluent (or that of the subsequent degreasing effluent).Type: GrantFiled: December 9, 1996Date of Patent: September 29, 1998Assignee: SollacInventors: Herve Derule, Valerie Bour Beucler, Jean Steinmetz
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Patent number: 5811032Abstract: A water-soluble polymer prepared by melting and reacting a mixture of an oxycarboxylic acid having a melting point of 170.degree. C. or less and maleamic acid, or a mixture of a plurality of oxycarboxylic acids including at least one oxycarboxylic acid having a melting point of 170.degree. C. or less and maleamic acid, at a temperature of 170.degree. C. or less at the start of the reaction to obtain a polymer; and then hydrolyzing the polymer.Type: GrantFiled: September 19, 1996Date of Patent: September 22, 1998Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Ryozo Kawai, Hiroshi Kurata, Yukari Shimizu, Shoichiro Kajiwara
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Patent number: 5795851Abstract: A process for inhibiting the corrosion of metals, in which the metals are treated with anti-corrosion agents, corrosion inhibiting agents or metal treating agents which are composed of or which contain lactobionic acid N-alkylamides and/or lactobionic acid alkylamine amides and/or di-lactobionic acid alkyl diamides, in which the saturated or unsaturated alkyl group bonded to the amide function has a chain length of more than 18 carbon atoms.Type: GrantFiled: August 8, 1997Date of Patent: August 18, 1998Assignee: Solvay Deutschland GmbHInventors: Klaus Gerling, Helge Rau, Kornelia Wendler, Karlheinz Uhlig
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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
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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
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Patent number: 5779938Abstract: The invention is an effective, easy to produce, and economical corrosion inhibitor which can be used in a variety of environments. The corrosion inhibitor of the present invention is the salt of certain tertiary amines. The corrosion inhibitor is the reaction product of one or more tertiary amines and certain carboxylic acids, preferably a mixture of mercaptocarboxylic and carboxylic acids.Type: GrantFiled: August 24, 1995Date of Patent: July 14, 1998Assignee: Champion Technologies, Inc.Inventors: Ali Naraghi, Philippe Prince
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Patent number: 5756003Abstract: Corrosion prevention compositions which contain lactobionic acid N-alkylamides 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 4, 1997Date of Patent: May 26, 1998Assignee: Solvay Deutschland GmbHInventors: Klaus-Guenter Gerling, Helge Rau, Kornelia Wendler, Petra Schwarz, Karlheinz Uhlig
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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
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Patent number: 5750037Abstract: The invention is a method for removing dissolved oxygen from alkaline water which comprises adding to alkaline water containing dissolved oxygen an effective oxygen-scavenging amount of a water-soluble carboxylate at temperatures above 400.degree. F. A preferred material is tartronic acid. At lower temperatures, a catalyst is also required.Type: GrantFiled: October 15, 1996Date of Patent: May 12, 1998Assignee: Nalco Chemical CompanyInventors: Paul M. Bizot, Bruce R. Bailey, Peter D. Hicks
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Patent number: 5746946Abstract: The invention relates to imidazolidinone derivatives formed from the reaction of (1) a substituted-ethyl imidazolidinone; (2) substituted ethyl/propyl propylene urea or (3) a cyclic propylene urea with: (a) a C.sub.1 -C.sub.24 alkyl or a C.sub.3 -C.sub.24 alkenyl substituted anhydride or, (b) a C.sub.3 -C.sub.24 carboxylic acid or corresponding ester; their compositions and use as corrosion inhibitors and/or surfactants.Type: GrantFiled: December 26, 1996Date of Patent: May 5, 1998Assignee: King Idustries, Inc.Inventors: Zhigiang Alex He, Werner Joseph Blank
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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
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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
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Patent number: 5708108Abstract: A polymer and method of controlling corrosion and the formation and deposition of scale imparting compounds in water systems is disclosed. The polymer has the general structure: ##STR1## wherein E.sup.1 comprises the repeat unit obtained after polymerization an .alpha.,.beta. ethylenically unsaturated carboxylic acid monomers, lower alkyl (C.sub.1 -C.sub.6) ester or a hydroxylated lower alkyl (C.sub.1 -C.sub.6) ester of such carboxylic acid, or amide forms thereof; E.sup.2 comprises the repeat unit obtained after polymerization of an .alpha.,.beta. ethylenically unsaturated monomer containing a sulfonic acid functionality; R.sup.1 is a hydrogen or a lower (C.sub.1 -C.sub.3) alkyl; R.sup.2 is --CH.sub.2 --O-- or --C(.dbd.O)--O--; R.sup.3 is --?--CH.sub.2 --CH(--CH.sub.2 --OH)--O--!--.sub.n ; n is an integer greater than 1; and R.sup.Type: GrantFiled: May 3, 1996Date of Patent: January 13, 1998Assignee: BetzDearborn Inc.Inventors: William S. Carey, Andrew Solov
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Patent number: 5688310Abstract: A corrosion protection material and method for anon-metal alloys, particularly light aluminum alloys; the method comprises the steps of coating a material to be protected with a layer containing a chromium-free inhibitor, comprising at least one dihydroxyazoic salt having structural unit (a), wherein Y is a salt producing anion and M is a metal; for the same number of moles, protection with an effectiveness comparable to that of chromate inhibitors may thus be achieved; ##STR1##Type: GrantFiled: July 6, 1995Date of Patent: November 18, 1997Inventors: Pierre Mauret, Louis Gaches
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Patent number: 5651916Abstract: The preparation of propylene glycol compositions containing alkali metal silicates having improved gel resistance is provided by forming a silicate premix having effective amounts of inorganic base compound(s) and water. The silicate premix is then added to the propylene glycol.Type: GrantFiled: August 23, 1995Date of Patent: July 29, 1997Assignee: Prestone Products CorporationInventor: Thomas W. Weir
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Patent number: 5650097Abstract: Steel anticorrosion and lubricity composition consisting essentially of (a) a surfactant; (b) at least one neutralized alkyl phosphate in a surfactant:phosphate weight ratio in the range between 10:1 to 1:10, said phosphate having the general formula:(RO).sub.m --P--(O)--(OH).sub.nwherein R is an alkyl group having 4 to 20 carbon atoms; m is 1 or 2, and n is 3m; and optionally (c) 5 to 40 weight percent, based on the combined weight of said surfactant and said phosphate, of at least one carboxylic acid which has both a hydrophilic and a hydrophobic portion.Type: GrantFiled: October 6, 1995Date of Patent: July 22, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventors: Ernest Byron Wysong, James Allan Wingrave, Steven Arnold Dombchik, Edward Clarkin Squire
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Patent number: 5643499Abstract: Galvanic degradation under salt spray or salt water conditions in hybrid structures containing a corrosible metal and a conductive-fiber reinforced polymer matrix composite is reduced through the addition to the polymer matrix of the composite of an effective amount of an inorganic corrosion/degradation inhibitor.Type: GrantFiled: September 14, 1993Date of Patent: July 1, 1997Assignee: Cytec Technology Corp.Inventors: Jack D. Boyd, Lawrence C. Hopper
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Patent number: 5643500Abstract: The present invention is directed towards the use of a reaction product of an alkynediol and a polyalkylene polyamine to inhibit metal surface corrosion caused by water present in the hydrocarbons in oil pipelines.Type: GrantFiled: July 24, 1995Date of Patent: July 1, 1997Assignee: BetzDearborn Inc.Inventors: Bruno Morin, Alan E. Goliaszewski
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Patent number: 5637251Abstract: This invention relates to a water-based antifreeze or coolant composition having improved antioxidant and anticorrosion properties and comprising a major amount of an aqueous solution of a polyhydric alcohol and a minor amount of a functional additive composition consisting of monoallylamine salt of 2,5-dimercapto-1,3,4-thiadiazole and monoallylamine salt of benzoic acid.Type: GrantFiled: July 31, 1995Date of Patent: June 10, 1997Assignee: R.T. Vanderbilt Company, Inc.Inventors: Thomas J. Karol, Steven G. Donnelly
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Patent number: 5607623Abstract: Polyaspartic acid and its salts ms used as a carbon dioxide corrosion inhibitor for ferrous metal surfaces in contact with a substantially acidic corrosive aqueous saline environment. In particular, carbon dioxide corrosion of mild steel in brine substantially free of dissolved oxygen can be effectively inhibited under mild to moderate dynamic flow use conditions by relatively low concentrations of polyaspartic acid.Type: GrantFiled: March 8, 1995Date of Patent: March 4, 1997Assignee: Donlar CorporationInventors: William J. Benton, Larry P. Koskan
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Patent number: 5601754Abstract: A polymer and method of controlling corrosion and the formation and deposition of scale imparting compounds in water systems is disclosed. The polymer has the general structure: ##STR1## wherein E.sup.1 comprises the repeat unit obtained after polymerization of one or more .alpha., .beta. ethylenically unsaturated monomers, selected from the group consisting of a carboxylic 3acid, lower alkyl (C.sub.1 -C.sub.6) ester or a hydroxylated lower alkyl (C.sub.1 -C.sub.6) ester of such carboxylic acid, and amide forms thereof; E.sup.2 comprises the repeat unit obtained after polymerization of one or more .alpha., .beta. ethylenically unsaturated monomer containing a sulfonic acid functionality; R.sup.1 is a hydrogen or a lower (C.sub.1 -C.sub.3) alkyl; R.sup.2 is --CH.sub.2 -- O--or --C(.dbd.O)--O--; R.sup.3 is --(--CH.sub.2 --CH(--CH.sub.2 --OH)--O--)--.sub.n ; n is an integer greater than 1; and R.sup.Type: GrantFiled: April 21, 1995Date of Patent: February 11, 1997Assignee: Betz Laboratories, Inc.Inventors: William S. Carey, Andrew Solov
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Patent number: 5599482Abstract: A lead-free anticorrosive formulation applied in layer form for the protection of metal films applied to transparent supports, said formulation comprising a binder consisting of at least one resin selected from the group consisting of isomerized rubber, urethane oil, alkyd, modified alkyd, acrylic, phenol and epoxy resins, at least one melamine resin, corrosion-inhibiting pigments consisting of zinc cyanamide and dicyandiamide, fillers, metal oxides, at least one solvent and adhesion promoting additives. Said formulation being particularly useful with mirrors, reflective surfaces and the like.Type: GrantFiled: December 10, 1992Date of Patent: February 4, 1997Assignee: Fenzi S.p.A. Vernici ed Accessori VetrariInventor: Fernando Fenzi
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Patent number: 5591381Abstract: The present invention provides corrosion inhibiting compositions and methods whereby protective coatings are formed on metal surfaces. The compositions are basically comprised of a corrosion inhibiting condensation reaction product enhanced by the presence of antimony or bismuth compounds.Type: GrantFiled: April 6, 1994Date of Patent: January 7, 1997Assignee: Halliburton CompanyInventor: Michael L. Walker
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Patent number: 5589106Abstract: The prevention of corrosion on the surfaces of metallic pipes, heat exchangers, and the like which are in contact with industrial cooling waters, and particularly industrial cooling waters containing low levels of hardness is controlled utilizing a corrosion inhibiting amount of a composition including an alkali metal silicate, a hydroxycarboxylic acid or its water soluble salts, an organophosphonate, and a water soluble polymer which acts as a dispersant. Superior corrosion inhibition is achieved using the compositions of this invention as corrosion inhibitors, particularly in cooling water systems employing mild steel metallurgy.Type: GrantFiled: February 14, 1995Date of Patent: December 31, 1996Assignee: Nalco Chemical CompanyInventors: Sang-Hea Shim, Dennis P. Bakalik, Donald A. Johnson, Bo Yang, Frank F. Lu
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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
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Patent number: 5587109Abstract: A method of treating an aqueous system is described which comprises incorporating in the system a hydroxylamine derivative of the general formula: ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 which may be the same or different represents hydrogen, alkyl of 1 to 8 carbon atoms or aryl or a water soluble salt thereof or a precursor thereof, and a tannin in a weight ratio of at least 2:1. This is particularly useful for boiler water systems.Type: GrantFiled: April 19, 1995Date of Patent: December 24, 1996Assignee: W. R. Grace & Co.-Conn.Inventors: Brian Greaves, Stephen C. Poole, Chih M. Hwa, Joseph C. Fan
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Patent number: 5573708Abstract: A general-purpose organic rust inhibitor which can effectively prevent corrosion of metals, and which comprising a compound represented by the general formula (1): ##STR1## wherein, in the above general formula (1), R.sub.1 represents a fluorine-substituted alkyl group; R.sub.2 is a hydrogen atom or a group defined for R.sub.1 or an organic residue; R.sub.3 and R.sub.4 are hydrogen or an ionizable group at least for either of the two, or an ionizable group in which R.sub.3 and R.sub.4 are connected to each other.Type: GrantFiled: July 20, 1995Date of Patent: November 12, 1996Assignee: Union Chemical Co., Ltd.Inventor: Shigeru Otomo
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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
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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
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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
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Patent number: 5531937Abstract: Compositions and a method of using the compositions to inhibit corrosion. The compositions are water soluble n-alkyl morpholine, saturated dicarboxylic acid, optionally alkanol amine and optionally surfactant compositions which inhibit ferrous metal corrosion when added to aqueous oxygen-free solutions.Type: GrantFiled: September 12, 1995Date of Patent: July 2, 1996Assignee: Betz Laboratories, Inc.Inventors: Ljiljana V. Minevski, Edmund J. Bockowski
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Patent number: 5518629Abstract: A method of controlling scale formation and deposition and corrosion in aqueous systems is described wherein a treatment solution of a substoichiometric amount of 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--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; and Y and Y.sup.Type: GrantFiled: November 29, 1994Date of Patent: May 21, 1996Assignee: Betz Laboratories, Inc.Inventors: Libardo A. Perez, William S. Carey, Donald T. Freese, Judith B. Rockett
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Patent number: 5519074Abstract: The invention relates to crystalline complex compounds of formula I ##STR1## wherein the general symbols are as defined in claim 1, as corrosion inhibitors in coating compositions for protecting metallic surfaces.Type: GrantFiled: January 12, 1995Date of Patent: May 21, 1996Assignee: Ciba-Geigy CorporationInventors: Andreas Kramer, Adalbert Braig
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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
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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