Patents Assigned to Kemira Oyj
  • Friction Reducing Polymers
    Publication number: 20160024375
    Abstract: Described herein are friction reducing polymers comprising two or more recurring units wherein at least one recurring unit is an acrylic acid or acrylamide monomer and at least one recurring unit is a vinyl monomer selected from a vinyl alcohol, a vinyl ester, and a vinyl ether.
    Type: Application
    Filed: March 18, 2014
    Publication date: January 28, 2016
    Applicant: Kemira Oyj
    Inventors: Jiang Li, Ronald Robinson, Philip Watson, Logan Jackson
  • Process for the purification of iron salt solutions
    Patent number: 9242877
    Abstract: A process is provided for removing metal salt co-constituents from an iron-containing solution comprising: (a) decreasing the free acidity of the solution to produce a slurry; (b) optionally heating the solution or the slurry to a temperature at least 30° C.; (c) optionally aging the slurry; (d) adding one or more cationic polyelectrolyte flocculants to the slurry; and (e) separating a solid-containing portion from a liquid portion of the slurry.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: January 26, 2016
    Assignee: Kemira Oyj
    Inventors: Sheila St. Amour, Jan Pavlicek
  • Biocide composition and method for treating water
    Publication number: 20150351383
    Abstract: The present invention provides a biocide composition comprising a biocide and a carrier, wherein the biocide is soluble in the carrier. The carrier may comprise polyethylene glycol ester. The present invention also provides a method for controlling biofilms by eliminating and/or preventing microorganisms in an aqueous environment.
    Type: Application
    Filed: January 27, 2014
    Publication date: December 10, 2015
    Applicant: KEMIRA OYJ
    Inventor: KEMIRA OYJ
  • Methods of measuring a characteristic of a creping adhesive film and methods of modifying the creping adhesive film
    Patent number: 9182271
    Abstract: Described herein are quartz crystal microbalance (QCM) and quartz crystal microbalance with dissipation (QCMD) techniques that can be used for measuring characteristics of a creping adhesive film similar to the creping adhesive film that is formed on a Yankee dryer during the tissue and towel manufacturing process. In addition, exemplary embodiments described herein may use these techniques to predict performance of creping aids utilized to form a creping adhesive film.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: November 10, 2015
    Assignee: KEMIRA OYJ
    Inventors: Vladimir Grigoriev, Danny Nguyen, Scott Rosencrance, Chen Lu
  • Method for improving rheological properties of an aqueous pigment slurry and a dispersion agent
    Patent number: 9145504
    Abstract: The invention relates to a method for improving rheological properties of an aqueous pigment slurry. In the method dispersion agent is added to an aqueous phase of a slurry comprising pigment particles or to the aqueous phase into which the pigment particles are to be added. The dispersion agent comprises styrene acrylate copolymer. The invention relates also to dispersion agent for a pigment slurry comprising a first component comprising styrene acrylate copolymer and a second component comprising a conventional dispersion agent, such as a straight-chain polyacrylate.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: September 29, 2015
    Assignee: KEMIRA OYJ
    Inventors: Esko Aarni, Perttu Heiska, Kimmo Huhtala
  • Method and system for control of an addition rate of a hexavalent chromium control chemical to water
    Publication number: 20150246834
    Abstract: The invention describes a method and system for controlling the addition rate of a contaminant control chemical to a water or wastewater line. The level of hexavalent chromium as a contaminant in the water or wastewater is measured using a spectro-photometric probe placed in the line. Data representative of the level of measured hexavalent chromium content is read into a computing unit, which determines a required contaminant control chemical addition rate based on said level of hexavalent chromium content. The contaminant control chemical is then added at the required addition rate to reduce the amount of hexavalent chromium to a predetermined level.
    Type: Application
    Filed: March 3, 2014
    Publication date: September 3, 2015
    Applicant: Kemira Oyj
    Inventors: Roderick Abinet, Greg Land, David Soper
  • ABSORBENT MATERIALS, PRODUCTS INCLUDING ABSORBENT MATERIALS, COMPOSITIONS, AND METHODS OF MAKING ABSORBENT MATERIALS
    Publication number: 20150238650
    Abstract: In various exemplary embodiments described herein, an absorbent structure (e.g., a paper material) having an applied absorbent material (e.g., an absorbent film) may be formed by treating a fiber (e.g., a cellulosic fiber) with an applied absorbent material forming system (also referred to as a “film forming system”), absorbent materials, compositions, methods of making absorbent materials, and the like.
    Type: Application
    Filed: September 5, 2013
    Publication date: August 27, 2015
    Applicant: KEMIRA OYJ
    Inventors: Chen Lu, Vladimir Grigoriev, Scott Rosencrance, Henry Skoog
  • Process for the preparation of a mixture of chelating agents
    Patent number: 9090536
    Abstract: The present invention relates to a process for the preparation of a mixture of aspartic acid diethoxy succinate and an amino acid derivative of the general formula (I) wherein n is 1-10, m is 0 or 1, and R is hydrogen or an alkali metal or alkaline earth metal ion, comprising reacting maleate with diethanol amine under alkaline conditions in the presence of a lanthanoid catalyst to form aspartic acid diethoxy succinate followed by adding aspartic acid which reacts with unreacted maleate to form imino disuccinic acid, i.e. an amino acid derivative of formula (I) wherein m is 0, or by adding a diamine derivative of the general formula (II) NH2(CH2)nNH2 wherein n is as defined above, which reacts with unreacted maleate to form an amino acid derivative of formula (I) wherein m is 1 and n is as defined above.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: July 28, 2015
    Assignee: KEMIRA OYJ
    Inventors: Reijo Aksela, Jussi Rissanen
  • Biodegradability of antiscalant formulations
    Patent number: 9080136
    Abstract: Anionic polymers comprising. organic counterfoils exhibit improved biodegradability. The anionic polymers are useful as antiscalants. The biodegradability of an anionic polymer may be improved by replacing inorganic counterions with organic counterions.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: July 14, 2015
    Assignee: Kemira OYJ
    Inventors: David A. Mortimer, Robert J. Jackson, Sun-Yi Huang
  • Method for controlling size distribution of polymer particles during preparation of aqueous polymer dispersion and aqueous polymer dispersion
    Patent number: 9079995
    Abstract: The present disclosure relates to a method for controlling size distribution of formed polymer particles during preparation of aqueous polymer dispersion. The method comprises obtaining an aqueous polysaccharide solution, which comprises about 10 to 40 weight-% polysaccharide containing a free hydroxyl group, such as starch, and polymerising in the polysaccharide solution in the presence of a graft-linking, water-soluble redox system about 30 to 60 weight-% of at least one optionally substituted styrene, about 60 to 30 weight-% of at least one C1-C4-alkyl (meth)acrylate, and 0 to about 10 weight-% of other ethylenically unsaturated copolymerizable monomers. The size distribution of the formed polymer particles is controlled by adjusting viscosity of the polysaccharide solution before the polymerisation to a level less than about 20 mPas.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: July 14, 2015
    Assignee: KEMIRA OYJ
    Inventors: Helena Peuranen, Perttu Heiska, Kimmo Huhtala, Nina Bruun
  • Method for producing paper, board or the like and agglomerate
    Patent number: 9080288
    Abstract: The invention relates to a method for producing paper, board or the like. In the method is obtained an aqueous filler dispersion, comprising particles of at least one first filler, the filler dispersion having a floc size distribution with original mean chord length value. The particles of the first mineral filler are brought into a contact with a cationic pre-treatment agent, which is capable of initiating flocculation of the filler particles in the dispersion, whereby a pre-treated filler dispersion comprising flocs, which comprise first mineral particles, is formed. The pre-treated filler dispersion is combined with a stock of fibers. The floc size distribution of the filler dispersion is changed with the pre-treatment agent, which is a natural and/or synthetic polymer, so that the mean chord length value increases at least with 2% from the original mean chord length value.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: July 14, 2015
    Assignee: KEMIRA OYJ
    Inventors: Matti Hietaniemi, Mikko Virtanen, Jonni Ahlgren
  • Catalyst recovery process
    Patent number: 9061276
    Abstract: The present invention relates to a method for recovering lanthanoid catalyst from the preparation of aspartic acid diethoxy succinate comprising contacting a carbonate source with a solution containing lanthanoid ions derived from said preparation and a chelating agent different from aspartic acid diethoxy succinate to precipitate lanthanoid carbonate followed by separating the precipitated lanthanoid carbonate from the solution.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: June 23, 2015
    Assignee: KEMIRA OYJ
    Inventors: Reijo Aksela, Jussi Rissanen
  • METHOD FOR INCREASING PAPER STRENGTH
    Publication number: 20150144282
    Abstract: The present invention provides a method for increasing paper strength in papermaking process comprising adding to a pulp a composition comprising an anionic polyacrylamide (APAM) and a high charge cationic glyoxylated polyacrylamide (GPAM). The present invention also provides paper obtained with said method.
    Type: Application
    Filed: November 22, 2013
    Publication date: May 28, 2015
    Applicant: KEMIRA OYJ
    Inventors: Chen Lu, Scott Rosencrance, Danny Nguyen
  • Azo dyes
    Patent number: 9023118
    Abstract: The present invention relates to new azo dyes, a process for their preparation, and their use for dyeing or printing fibrous materials, to produce materials with brownish shades.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: May 5, 2015
    Assignee: Kemira OYJ
    Inventors: Helmut-Martin Meier, Christof Heide, Klaus-Günter Strumpf, Thomas Hübbe
  • Method and system for analyzing solid matter containing liquids and monitoring or controlling processes containing such liquids
    Publication number: 20150114094
    Abstract: The invention concerns a method and system for analyzing a liquid sample containing solid matter. The method comprises fractionating the sample according to particle sizes and/or masses of the solid matter so as to produce sample fractions, and measuring at least one physical or chemical property of at least one of said sample fractions. According to the invention the sample is conducted to a disintegration channel having one or more depressions, and a liquid flow having a non-constant temporal velocity profile is applied through the disintegration channel, in order to gradually take solid matter of the sample with the liquid flow from said one or more depressions for providing said sample fractions. The invention allows for efficient fractionation of samples, which cannot be fractionated using conventional field flow fractionation, for example.
    Type: Application
    Filed: May 24, 2013
    Publication date: April 30, 2015
    Applicant: Kemira Oyj
    Inventors: Lari Vähäsalo, Eija Saari, Iiris Joensuu, Marjatta Piironen
  • Biocidal system and methods of use
    Patent number: 9018141
    Abstract: Methods of treating a gas field fluid or oil field fluid is provided, the method comprising: a) adding glutaraldehyde to the gas field fluid or oil field fluid in an amount effective to reduce or inhibit microbial activity; and b) after a delay, adding 3,5-dimethyl-1,3,5-thiadiazinane-2-thione to the gas field fluid or oil field fluid.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: April 28, 2015
    Assignee: Kemira Oyj
    Inventors: Marko Kolari, Sherrill Gammon, Jaakko Simell
  • Chemistry for effective microbe control with reduced gas phase corrosiveness in pulp and paper processing systems
    Patent number: 8986606
    Abstract: Processes for biofilm or microorganism growth control in an aqueous system such as a pulp, paper or board manufacturing system are described in which a halogenated hydantoin is added to the aqueous system in combination with haloamine, chlorine dioxide or a combination thereof. The halogenated hydantoin is preferably a fully or partially halogenated dialkyl hydantoin, and more preferably 5,5-dimethyl hydantoin or 5-methyl-5-ethyl hydantoin. The haloamine is preferably a monohaloamine, dihaloamine, trihaloamine, or a combination thereof, and more preferably monochloramine, monobromamine, bromochloroamine or a combination thereof. The halogenated hydantoin is preferably added to the aqueous system in portions of the system susceptible to gas phase corrosion, such as the short loop of the system, and the haloamine and chlorine dioxide are preferably added to other portions of the system.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: March 24, 2015
    Assignee: Kemira Oyj
    Inventors: Mark Nelson, Marko Kolari, Juhana Ahola
  • Composition and process for increasing the dry strength of a paper product
    Patent number: 8980056
    Abstract: A dry strength additive composition generally includes an anionic and/or amphoteric polyacrylamide having a molecular weight of less than 1,000,000 Daltons, wherein the amphoteric polyacrylamide has a net negative charge; a cationic and/or amphoteric starch; and a cationic non-starch polymer having a charge density greater than 1 milliequivalent per gram (meq/g) at a pH of 3. The components defining the composition can be added to a pulp suspension sequentially or as a pre-blended mixture.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: March 17, 2015
    Assignee: Kemira Oyj
    Inventors: Chen Lu, Vladimir Grigoriev, Scott Rosencrance
  • Fixative composition, thick stock composition and process for fixating hydrophobic and/or anionic substances on fibres
    Patent number: 8936698
    Abstract: The present invention relates to a fixative composition and process for reducing hydrophobic and/or anionic substances in fiber-containing stock for making of paper, board or the like. The composition comprises a synthetic cationic polymer, which has a charge density of 3.0-24 meq/g, and a cationic non-degraded starch, which has charge density of 0.5-3.0 meq/g. The invention relates also to thick stock composition comprising fibers and a fixative composition according to the invention.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: January 20, 2015
    Assignee: Kemira, Oyj
    Inventors: Asko Karppi, Lenita Lindberg, Matti Hietaniemi
  • METHOD FOR PRODUCING PAPER, BOARD OR THE LIKE AND AGGLOMERATE
    Publication number: 20140360691
    Abstract: The invention relates to a method for producing paper, board or the like. In the method is obtained an aqueous filler dispersion, comprising particles of at least one first filler, the filler dispersion having a floc size distribution with original mean chord length value. The particles of the first mineral filler are brought into a contact with a cationic pre-treatment agent, which is capable of initiating flocculation of the filler particles in the dispersion, whereby a pre-treated filler dispersion comprising flocs, which comprise first mineral particles, is formed. The pre-treated filler dispersion is combined ed with a stock of fibres. The floc size distribution of the filler dispersion is changed with the pre-treatment agent, which is a natural and/or synthetic polymer, so that the mean chord length value increases at least with 2% from the original mean chord length value.
    Type: Application
    Filed: January 16, 2013
    Publication date: December 11, 2014
    Applicant: KEMIRA OYJ
    Inventors: Matti Hietaniemi, Mikko Virtanen, Jonni Ahlgren