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| Number | Title | Issue Date |
| 4446045 | Composition for treating aqueous mediums Compositions are disclosed for inhibiting scale formation and dispersing solids particulate matter in aqueous mediums. The compositions comprise an acrylic acid/lower alkyl hydroxy acrylate copolymer (I) in combination with a water soluble polymeric mater... | 05/01/1984 |
| 4446028 | Isopropenyl phosphonic acid copolymers used to inhibit scale formation A water soluble isopropenylphosphonic acid copolymer composition and method of use thereof are disclosed. The copolymer comprises repeat units (a) of the formula ##STR1## wherein X=OH or OM, wherein M is a cation; and repeat units (b) of the for... | 05/01/1984 |
| 4444675 | Alkaline scale abatement Formation of alkaline scale in water distillation equipment is reduced or substantially eliminated without a significant increase in equipment corrosion rate by dissolving an effective amount of carbon dioxide in brine which is boiling or flashed or which... | 04/24/1984 |
| 4443340 | Control of iron induced fouling in water systems A method for inhibiting corrosion and controlling deposition in an iron containing aqueous medium is disclosed. The method is capable of providing for the formation of a protective passive oxide film on the metallic surfaces in contact with the aqueous me... | 04/17/1984 |
| 4442009 | Boiler water treatment The present invention is directed to a method for controlling scale which would otherwise be formed from water-soluble calcium, magnesium and iron impurities contained in boiler water which would provide calcium, magnesium and iron ions. The method compri... | 04/10/1984 |
| 4435556 | Method of making and using novel scale inhibiting terpolymer A two-step process is disclosed for preparing an essentially non-crosslinked random copolymer of acrylic acid or methacrylic acid with esters of the acids which esters are formed by reaction with an alkylene oxide. Raw materials are (meth)acrylic acid and... | 03/06/1984 |
| 4434059 | Polymers for prevention of fouling by iron oxides in cooling systems Industrial process cooling water systems are stabilized against iron precipitation by adding thereto an effective amount of an acrylic acid-acrylamide copolymer having specific weight ratios.... | 02/28/1984 |
| 4432879 | Treatment of aqueous systems Sludge is dispersed in cooling water systems by means of a combination of 2-phosphonobutane-1,2,4-tricarboxylic acid and a water soluble organic polymer possessing carboxylic and sulfonate groups.... | 02/21/1984 |
| 4432884 | Scale inhibiting agent This invention relates to a scale inhibiting agent which comprises as an essential ingredient a copolymer of an alkylolamide compound such as N-methylol acrylamide, N-hydroxyethyl acrylamide or the like and an alkenyl compound such as acrylic acid, acryla... | 02/21/1984 |
| 4431547 | Use of acrylamide/acrylic acid copolymers for prevention of fouling by Ca3 (PO4)2 A copolymer consisting of a 3:1 ratio of acrylamide to acrylic acid with a molecular weight of approximately 10,000 is very effective in preventing calcium phosphate fouling of heat transfer surfaces as found, for example, in cooling water.... | 02/14/1984 |
| 4415467 | Agent for the purification of waste waters and process for its production The present invention is directed to a chemical composition for treating contaminated waste waters, particularly waste waters in the form of oily emulsions, to adsorb the contaminants between platelets of activated bentonite and encapsulate or trap the co... | 11/15/1983 |
| 4390670 | Acrylate/maleate copolymers, their preparation and use as antiscalants Substantially homogeneous acrylate/maleate copolymers of number average molecular weight of 500 to 5000 are prepared by copolymerizing 35 to 65 mole percent acrylic or methacrylic acid with 65 to 35 mole percent maleic anhydride at 80° to 150° C. in the... | 06/28/1983 |
| 4389324 | Polymeric composition for preventing the formation of scale during evaporation of sugar juices Polymeric compositions useful for preventing formation of scale in apparatus used for evaporating sugar juices comprise a mixture of at least three polymers selected from polyacrolein or - methacrolein compounds, poly-acrylic or - methacrylic compounds, c... | 06/21/1983 |
| 4387027 | Control of iron induced fouling in water systems A method for inhibiting corrosion and controlling deposition in an iron containing aqueous medium is disclosed. The method is capable of providing for the formation of a protective passive oxide film on the metallic surfaces in contact with the aqueous me... | 06/07/1983 |
| 4386005 | Scale inhibitor for reverse osmosis water purification system A composition for inhibiting scale build up in reverse osmosis water purification systems. The composition is composed of low molecular weight polyacrylic and phytic acid in a synergistic combination and significantly reduces build up of calcium, magnesiu... | 05/31/1983 |
| 4384979 | Corrosion inhibitor The waters used for cooling generally contain hard ions of the group consisting of calcium and magnesium ions concentration of from about 10 to 600 parts per million. Such waters also contain bicarbonate ions. When cooling waters are recirculated through ... | 05/24/1983 |
| 4374733 | Method for treating aqueous mediums Methods are disclosed for inhibiting scale formation and dispersing solids particulate matter in aqueous mediums. An acrylic acid/lower alkyl hydroxy acrylate copolymer (I) in combination with a water soluble polymeric material (II) having the formula ... | 02/22/1983 |
| 4372870 | Method and composition for treating aqueous mediums Method and composition for controlling the deposition of scale imparting precipitates on structural parts of a system exposed to an aqueous medium containing scale imparting precipitates, under scale imparting conditions, are disclosed. Specifically, thes... | 02/08/1983 |
| 4361492 | Particulate dispersant enhancement using acrylamide-acrylic acid copolymers A method of enhancing the activity of water-soluble, low molecular weight polymeric dispersants used to suspend iron oxides in cooling waters which also contain soluble iron compounds comprises treating such waters with the water-soluble, low molecular we... | 11/30/1982 |
| 4357207 | Low molecular weight cationic polymers as deposit inhibitors and dispersants in black liquor recovery systems The instant invention is directed to a method of inhibiting and dispersing deposit formation on metal surfaces of an evaporator used for the processing of black liquor which comprises the step of treating black liquor, at any point prior to completion of ... | 11/02/1982 |
| 4331792 | Continuous process for production of copolymer of an alkali metal vinyl sulfonate and acrylic acid There is provided a continuous process for the production of a copolymer of an alkali metal vinyl sulfonate and acrylic acid. The process comprises continuously feeding an aqueous solution of an alkali metal vinyl sulfonate and acrylic acid together with ... | 05/25/1982 |
| 4329250 | Low level chromate-based corrosion inhibition in aqueous mediums A method and composition are disclosed for treating corroding aqueous mediums to reduce the corrosion of metal surfaces exposed thereto. The treatment comprises water-soluble chromate and a copolymer of acrylic acid and hydroxy alkyl acrylate.... | 05/11/1982 |
| 4328180 | Cooling water corrosion inhibitor The waters used for cooling generally contain hard ions of the group consisting of calcium and magnesium ions concentration of from about 10 to 600 parts per million. Such waters also contain bicarbonate ions. When cooling waters are recirculated through ... | 05/04/1982 |
| 4326980 | Acrylic copolymer composition inhibits scale formation and disperses oil in aqueous systems Method and composition for controlling the deposition of scale imparting precipitates on structural parts of a system exposed to an aqueous medium containing scale imparting precipitates, under scale imparting conditions are disclosed. Specifically, these... | 04/27/1982 |
| 4324664 | Method and composition for treating aqueous mediums Method and composition for controlling the deposition of scale imparting precipitates on structural parts of a system exposed to an aqueous medium containing scale imparting precipitates, under scale imparting conditions, are disclosed. Specifically, thes... | 04/13/1982 |
| 4284513 | Process for preventing encrustations on surfaces which are in constant contact with aqueous solutions containing matter prone to crystallize The present invention is a process for preventing incrustations of surfaces which are in contact with aqueous solutions containing material prone to crystallize by forming a thin, protective film on the surface to be protected.... | 08/18/1981 |
| 4283300 | Method and composition to inhibit staining of porcelain surfaces by manganese Method and composition to inhibit the staining of water-contacting surfaces, such as those in a toilet bowl, which is caused by manganese present in household water in the presence of an oxidizing material. Manganese staining is inhibited by supplying to ... | 08/11/1981 |
| 4279768 | Service descaler for aqueous systems A scale removing formulation designed to remove scale build-up on metallic working surfaces, the scale being conventional and composed of calcium salts and iron oxides from aqueous systems such as boilers, cooling towers, heat exchangers, and the like, wh... | 07/21/1981 |
| 4271058 | Stable aqueous solutions of certain vinyl copolymers What is disclosed are stable aqueous solutions, useful for example to treat water to stabilize its hardness and to render it anticorrosive or biocidal, containing a dissolved cationic component, such as polyvalent metal cation or a cationic surface active... | 06/02/1981 |
| 4255309 | Polyacrylic acids and methyl vinyl ether/maleic anhydride copolymers as soft scale inhibitors A method is disclosed for inhibiting soft scale precipitation in black liquor systems by adding thereto a treatment comprising in combination polyacrylic acid and methyl vinyl ether/maleic anhydride copolymer.... | 03/10/1981 |
| 4223120 | Terpolymers of maleic anhydride and their use as scale control agents Terpolymers of maleic anhydride, acrylamide or methacrylamide and a third monomer consisting of octene, styrene and the like. Copolymers of maleic anhydride and acrylamide or methacrylamide. Use of the hydrolyzed form of the terpolymer as a scale control agent. Nov... | 09/16/1980 |
| 4212782 | Polymers of acid addition salts of methacrylic acid and a 2-mono(lower)alkylaminoethyl methacrylate Disclosed are solid, readily water-soluble addition polymers of acid addition salts of methacrylic acid and a 2-mono(lower)alkylaminoethyl methacrylate, whose lower alkyl group has up to 6 carbons and is straight or branched chain or cyclic. These polymer... | 07/15/1980 |
| 4204953 | Process for alkaline scaling A method for inhibiting the deposition of scale from saline water having bicarbonate alkalinity on to heat exchanger surfaces in a saline water evaporation plant comprises adding a mineral acid to neutralize part, but not all, of the bicarbonate alkalinit... | 05/27/1980 |
| 4196272 | Continuous process for the preparation of an acrylic acid-methyl acrylate copolymer in a tubular reactor A continuous process for the preparation of water-soluble copolymers of vinyl carboxylic acids and lower alkyl acrylates is disclosed. The process employs a tubular reactor and polymerizes the monomers in aqueous solution in the presence of a free radical... | 04/01/1980 |
| 4175066 | Dispersant for calcium carbonate Calcium carbonate is dispersed by a dispersant comprising a salt of an acrylic acid/maleic acid copolymer.... | 11/20/1979 |
| 4168230 | Synergistic composition comprising phosphorylated ethoxylated glycerine and polyacrylic acid for the prevention of CaCO3 scale in cooling water When certain low molecular weight polyacrylic acid salts are combined with an organic phosphate ester, an improved composition is afforded for preventing scale in industrial cooling systems.... | 09/18/1979 |
| 4166040 | Compositions comprising mixtures of polycationic and polyanionic polymers as magnesium scale control agents Mixtures of certain polycationic and polyanionic polymers derived from an ethylenically unsaturated dibasic acid or an ethylenically unsaturated sulfuric acid are effective compositions for the control of magnesium scale in evaporative desalination units.... | 08/28/1979 |
| 4164521 | Mixtures of polycationic and polyanionic polymers for scale control Certain mixtures of polyanionic and polycationic polymers are effective inhibitors of magnesium hydroxide scale formation in evaporative desalination units.... | 08/14/1979 |
| 4147627 | Process for scale control using mixtures of polycationic and polyanionic polymers Magnesium hydroxide scale formation in evaporative desalination units is inhibited by adding to the saline water being processed a mixture of certain polycationic and polyanionic polymers.... | 04/03/1979 |
| 4143222 | Method of controlling the molecular weight of vinyl carboxylic acid-acrylamide copolymers The molecular weight of acrylic acid-acrylamide copolymers can be controlled between the range of 3,000-300,000 by polymerizing an aqueous solution of these comonomers in a tube reactor at a pressure between 50-350 psig in the presence of a free radical c... | 03/06/1979 |
