Patents Assigned to Kemira
  • Patent number: 7906463
    Abstract: A well stimulation fluid includes water, a polymer, and a biocide consisting of 3,5-dimethyl-1,3,5-thiadiazinane-2-thione in an amount effective to inhibit bacterial growth.
    Type: Grant
    Filed: August 2, 2006
    Date of Patent: March 15, 2011
    Assignee: Kemira Chemicals Inc.
    Inventors: Ronald Joe Starkey, II, Geoffrey Allen Monteith, Carl Wilhelm Aften
  • Patent number: 7897010
    Abstract: The present invention provides methods for deinking printed waste paper—particularly methods that use a deinking composition that includes a hydrophobically-modified inorganic particle (“MIP”) to improve ink collection efficiency under traditional alkaline, reduced alkali, and true neutral deinking conditions. Deinking compositions are provided that include a hydrophobically-MIP substrate, a nonionic surfactant, and a fatty acid, or mixtures thereof. The improved ink collection of the present invention can result in deinked pulp of high quality and/or yields that has excellent brightness and effective residual ink concentrations (“ERIC”) values.
    Type: Grant
    Filed: January 8, 2007
    Date of Patent: March 1, 2011
    Assignee: Kemira Chemicals, Inc.
    Inventors: Scott Rosencrance, Charles M. Ngome, Kevin M. Hale
  • Publication number: 20110044883
    Abstract: A method of purifying flue gas desulfurization (FGD) gypsum. The method includes the steps of a) providing an aqueous slurry containing said FGD gypsum, b) passing the aqueous slurry to a magnetic separator, and c) contacting the FGD gypsum to be purified with a solution containing an acid and having pH below 5 in an acid washing step. Also, a purified FGD gypsum obtained by the inventive method and the use thereof as coating or filler pigment for paper or board.
    Type: Application
    Filed: April 8, 2009
    Publication date: February 24, 2011
    Applicant: KEMIRA OYJ
    Inventor: Perttu Heiska
  • Patent number: 7875213
    Abstract: A mineral slurry comprises mineral particles in an amount equal to or greater than about 60 percent by total weight of the slurry, wherein 85 percent of the mineral particles have an average particle size equal to or less than 2 micrometers; a polyelectrolyte dispersant derived from an acrylate polymer formed by reversible addition-fragmentation chain transfer polymerization, wherein the polyelectrolyte dispersant comprises endgroups comprising thio-containing residues derived from a trithiocarbonate chain transfer agent, wherein the polyelectrolyte dispersant is in an amount less than about 35 pounds of the dispersant per ton of dry mineral particles, and wherein the polyelectrolyte dispersant has a molecular weight of 3000 to 10,000 Daltons and a polydispersity of at least 1.0 and less than 1.5; and the remainder water.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: January 25, 2011
    Assignee: Kemira Oyj
    Inventor: Thomas J. Lynch
  • Patent number: 7867357
    Abstract: The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fiber material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a polylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 5. The invention also relates to peroxide bleaching processes.
    Type: Grant
    Filed: January 4, 2010
    Date of Patent: January 11, 2011
    Assignee: Kemira Oyj
    Inventors: Jonni Ahlgren, Aarto Parén, Jukka Jäkärä, Timo Härmä, Ilkka Renvall
  • Patent number: 7862685
    Abstract: The present invention provides methods for deinking printed waste paper—particularly methods that use a deinking composition that includes a hydrophobically-modified inorganic particle (“MIP”) to improve ink collection efficiency under traditional alkaline, reduced alkali, and true neutral deinking conditions. Deinking compositions are provided that include a hydrophobically-MIP substrate, a nonionic surfactant, and a fatty acid, or mixtures thereof. The improved ink collection of the present invention can result in deinked pulp of high quality and/or yields that has excellent brightness and effective residual ink concentrations (“ERIC”) values.
    Type: Grant
    Filed: January 9, 2006
    Date of Patent: January 4, 2011
    Assignee: Kemira Chemicals, Inc.
    Inventors: Scott Rosencrance, Charles Ngome, Kevin M. Hale
  • Publication number: 20100307706
    Abstract: The invention relates to a method for sizing a paper product that involves the steps of (a) providing a paper stock system; (b) forming, in the absence of high shearing forces, an aqueous sizing emulsion comprising an alkenylsuccinic anhydride component; (c) submitting the emulsion formed from step b to a post-dilution step in the presence of a cationic component under conditions, in the absence of high shearing forces, that produce a post-diluted emulsion having improved sizing efficacy; (d) adding the post-diluted emulsion to the paper stock; and (e) forming a paper web.
    Type: Application
    Filed: October 27, 2005
    Publication date: December 9, 2010
    Applicant: KEMIRA OYJ
    Inventors: Lucyna Pawlowska, Kimberly C. Dilts, Thomas Long, Charles R. Hunter, Robert Proverb
  • Publication number: 20100301255
    Abstract: Processes for forming ferric chloride solutions that are stable at relatively low temperatures and suitable for transportation without precipitation are provided. The stable ferric chloride solutions have an iron content of about 16 to about 23 weight percent and a hydrochloric acid content of about 11 to about 17 weight percent, wherein the ferric chloride solution is a stable solution and/or reversibly freezes at ?10° C. Also disclosed are processes for reconstituting the stable ferric chlorides solutions to provide a final iron content of 10 to 14 weight percent and lower the concentration of hydrochloric acid contained therein.
    Type: Application
    Filed: May 26, 2009
    Publication date: December 2, 2010
    Applicant: KEMIRA CHEMICALS INC.
    Inventors: Krister Eskilsson, Jeff Campbell, Stig Gunnarsson, Jan Pavlicek
  • Publication number: 20100297460
    Abstract: According to the invention, wood material is treated with a composition comprising at least one C1-C7 monocarboxylic acid or a salt, or mixtures thereof, and at least one chelating agent. These compounds are dissolved in a liquid aqueous vehicle. In this manner, the treated wood is endowed with excellent resistance against detrimental environmental effects.
    Type: Application
    Filed: December 3, 2008
    Publication date: November 25, 2010
    Applicant: KEMIRA OYJ
    Inventors: Jari-Jukka Kukkonen, Timo Nissinen, Reijo Aksela
  • Publication number: 20100292380
    Abstract: The present invention relates to a cost-effective and environmentally friendly polymeric defoamer formulation for use in various industrial applications that does not contain oil, EBS or free silicone.
    Type: Application
    Filed: May 15, 2009
    Publication date: November 18, 2010
    Applicant: Kemira Chemicals, Inc.
    Inventors: James Martin, Robert Wilson, Scott Rosencrance, David Previs
  • Patent number: 7829305
    Abstract: The invention is directed to a method for detecting the presence of biofilm-forming microorganisms in a paper or board making process for determining the need of an anti-biofilm agent in the process. The method comprises the steps: (a) subjecting a sampler device in the process line for a period of time to enable said microorganisms to form a biofilm in situ in said process on the surface of the sampler, (b) optionally treating said formed biofilm in a solution of a test anti-biofilm agent for a period of time, then (c) contacting said biofilm with a liquid growth medium in a recession of a culturing device for a period of time, and (d) removing the growth solution from the recession of said device and detecting qualitatively and/or quantitatively the presence or absence of a biofilm adhered on the walls of the recession. An assembly kit is also provided.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: November 9, 2010
    Assignee: Kemira Oyj
    Inventors: Marko Kolari, Mirja Salkinoja-Salonen, Terhi Johanna Hatunen
  • Publication number: 20100258477
    Abstract: Compositions and processes for separating bitumen from oil sands ore include contacting the oil sand ores with a composition including a carboxylate salt and/or acid and an aqueous liquid carrier. The carboxylate salt and/or acid is a C1-C7 alkyl, and in one embodiment, is a monocarboxylate.
    Type: Application
    Filed: April 13, 2009
    Publication date: October 14, 2010
    Applicant: KEMIRA CHEMICALS, INC.
    Inventors: Jari-Jukka Kukkonen, Eero Aitta, Pekka Oinas, Kaj Jansson, Mohan Nair
  • Patent number: 7794604
    Abstract: The invention relates to a method for removing lignin from an aqueous solution. It is accomplished by adding a calcium compound and an aluminium compound to said solution. Said calcium compound is preferably calcium chloride and said aluminium compound is preferably a polymeric aluminium hydroxide salt.
    Type: Grant
    Filed: July 8, 2005
    Date of Patent: September 14, 2010
    Assignee: Kemira Oyj
    Inventors: Heikki Palonen, Arja Paloniemi, Reetta Taittonen, Päivi Rousu
  • Publication number: 20100218950
    Abstract: A well stimulation and or treatment fluid that includes water, other additives, and a biocide consisting of 3,5-dimethyl-1,3,5-thiadiazinane-2-thione in an amount effective to inhibit bacterial growth and minimize antagonistic reactions between the biocide and other additives. Also disclosed are well injection compositions, stimulations, squeezing, waterflood, packing, cement compositions, and methods for cementing.
    Type: Application
    Filed: May 11, 2010
    Publication date: September 2, 2010
    Applicant: KEMIRA CHEMICALS, INC.
    Inventors: Ronald Joe Starkey, II, Geoffrey Allen Monteith, Carl Wilhelm Aften
  • Patent number: 7786238
    Abstract: Cationic starch graft copolymer composed of the monomers a) to d) a) 20-80% by weight of acrylamide, methacrylamide or mixtures thereof, b) 3-20% by weight of at least one basic or cationic vinyl monomer, c) 0.005-1.5% by weight of at least one bifunctional or higher-functional crosslinking agent, d) 0-10% by weight of at least one nonionic or anionic vinyl monomer which differs from the monomers mentioned under a) to c) and a grafting base e) e) 15-70% by weight of at least one starch or one starch derivative, the sum of a) to e) being 100% by weight.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: August 31, 2010
    Assignee: Kemira Oyj
    Inventors: Bernd Hauschel, Bernd Thiele, Thomas Hübbe, Bernhard Jansen
  • Patent number: 7786054
    Abstract: A well stimulation and or treatment fluid that includes water, other additives, and a biocide consisting of 3,5-dimethyl-1,3,5-thiadiazinane-2-thione in an amount effective to inhibit bacterial growth and minimize antagonistic reactions between the biocide and other additives. Also disclosed are well injection compositions, stimulations, squeezing, waterflood, packing, cement compositions, and methods for cementing.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: August 31, 2010
    Assignee: Kemira Chemicals, Inc.
    Inventors: Ronald Joe Starkey, II, Geoffrey Allen Monteith, Carl Wilhelm Aften
  • Publication number: 20100216934
    Abstract: Method of grafting an anionic organic polymer to an organic polymer in latex form, which method comprises forming a water-based mixture of (1) a latex of an organic polymer, (2) an anionic organic polymer, and (3) a free radical initiator, and effecting grafting between said latex polymer and said anionic organic polymer characterized in that the anionic organic polymer is (i) an anionic homopolymer or anionic random copolymer wherein at least 50 mole % of the repeating units are repeating units that bear at least one acid group or acid salt group or (ii) a graft or block copolymer comprising a segment consisting of a anionic homopolymer or anionic random copolymer as defined in (i), and aqueous dispersion comprising graft polymer particles.
    Type: Application
    Filed: March 31, 2008
    Publication date: August 26, 2010
    Applicant: KEMIRA OYJ
    Inventors: Teppo Sahlberg, Jan-Luiken Hemmes, Jonni Ahlgren, Uwe Schulze, Claudia Eigen
  • Patent number: 7775704
    Abstract: A device for continuously producing emulsions or dispersions while excluding air comprises a mixing vessel, which is closed on all sides and which has supply tubes and discharge tubes for introducing and discharging fluid substances or compositions, and also an impeller, which permits an agitating input into the emulsion or dispersion without generating cavitation forces and without high-pressure homogenization. For preparing the cosmetic emulsions of the invention, as well, emulsifiers are generally used.
    Type: Grant
    Filed: March 21, 2003
    Date of Patent: August 17, 2010
    Assignee: Kemira Oyj
    Inventors: Gerd Dahms, Helmut Hegmann
  • Publication number: 20100200499
    Abstract: The present invention relates to a method for treatment of sludge in water purification, the method comprising the steps: providing an enzyme mixture comprising at least one enzyme capable of digesting natural polymeric materials; and adding the enzyme mixture and at least one chelating reagent, in optional order or simultaneously, to an aqueous sludge suspension.
    Type: Application
    Filed: May 31, 2008
    Publication date: August 12, 2010
    Applicant: KEMIRA OYJ
    Inventors: Estera Szwajcer Dey, Olof Norrlow
  • Publication number: 20100200239
    Abstract: Friction reducing compositions for use in well treatment fluids generally include an aqueous fluid; a polymeric friction reducer; and 3,5-dimethyl-1,3,5-thiadiazinane-2-thione. It has been found that the combination of the polymeric friction reducer; and 3,5-dimethyl-1,3,5-thiadiazinane-2-thione unexpectedly and synergistically increases friction reduction and inversion behavior, where applicable. Also disclosed are methods for the fracturing of a subterranean hydrocarbon bearing formation to stimulate the production of the hydrocarbons by injecting the friction reducing composition.
    Type: Application
    Filed: February 9, 2009
    Publication date: August 12, 2010
    Applicant: Kemira Chemicals, Inc.
    Inventor: Carl Wilhelm Aften