Patents Assigned to Kemira
  • Patent number: 7767059
    Abstract: The invention relates to a flushable paper product comprising a fibrous substrate having (i) at least one strength region comprising a reacted cationic or a reacted nonionic strength agent and (ii) at least one dispersibility region, wherein the paper product has (a) a dispersibility of at least one tenth of a second, (b) a dry strength, and (c) a wet strength of at least about five percent of the dry strength.
    Type: Grant
    Filed: June 18, 2003
    Date of Patent: August 3, 2010
    Assignee: Kemira Oyj
    Inventors: Michael Ryan, David L. Dauplaise
  • Patent number: 7767057
    Abstract: The present invention relates to methods and compositions for deinking waste paper, optionally in non-alkaline or low-alkaline systems. Deinking compositions are provided that include a blend of an alkoxylated fatty alcohol and a fatty acid. The compositions may further include a second alkoxylated fatty alcohol. The deinking compositions also may include a first non-alkoxylated fatty acid and optionally a second alkoxylated fatty acid. Cationic derivatives such as cationic polymers also may be added to the deinking blend.
    Type: Grant
    Filed: January 8, 2007
    Date of Patent: August 3, 2010
    Assignee: Kemira Chemicals, Inc.
    Inventors: Scott William Rosencrance, Charles Mesumbe Ngome
  • Patent number: 7754048
    Abstract: The present invention relates to a process for bleaching a cellulosic fibre material with a peroxide compound in an aqueous alkaline medium, comprising a bleaching step wherein: a) a first polymer (A) comprising a homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, and a solution of a second polymer (B) comprising a poly-alpha-hydroxyacrylic acid or a salt thereof, are added to a cellulosic fibre material, and b) thereafter adding a peroxide compound and an alkaline substance and carrying out the bleaching.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: July 13, 2010
    Assignee: Kemira Oyj
    Inventors: Aarto Paren, Jukka Jäkärä, Ilkka Renvall, Jonni Ahlgren, Riitta Laitinen, Jussi Nikkarinen, Tapio Viitanen
  • Publication number: 20100170778
    Abstract: The present invention relates to a process for the production of polyaluminium salts, preferably polyaluminium sulphate and polyaluminium chloride, and derivatives thereof, from aluminium containing raw materials and acids, wherein microwaves are used for partial heating of the reaction mixture. The present invention also relates to a system for the production of polyaluminium salts and derivatives thereof.
    Type: Application
    Filed: June 5, 2008
    Publication date: July 8, 2010
    Applicant: KEMIRA KEMI AB
    Inventors: Stig Gunnarsson, Marten Soderlund
  • Patent number: 7744837
    Abstract: The invention relates to a reducing agent composition for use in the catalytic reduction process of nitrogen oxides in exhaust gases, the composition containing 20-40 w % of urea, 19-40 w % of ammonium formate, and water.
    Type: Grant
    Filed: August 3, 2005
    Date of Patent: June 29, 2010
    Assignee: Kemira Oyj
    Inventors: Timo Nissinen, Timo Härmä, Jari-Jukka Kukkonen
  • Patent number: 7736465
    Abstract: The invention relates to a composition comprising (a) a functional promoter comprising a water-soluble anionic polymer having a molecular weight of at least about 50,000 daltons and a molecular weight charge index value of at least about 10,000; (b) a cationic surfactant component; such that when the composition treats a fibrous substrate, in conjunction with a cationic strength agent, the treated fibrous substrate exhibits (i) a ratio of wet tensile strength to dry tensile strength ranging from about 1:5 to about 1:2 and (ii) an increase in a ratio of wet tensile strength to dry tensile strength of at least about 10%, as compared to when the fibrous substrate is treated with the functional promoter and without a surfactant. The invention also relates to a paper product made with such a system, and method for imparting wet strength to a paper product with the functional promoter.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: June 15, 2010
    Assignee: Kemira Oyj
    Inventors: Michael Ryan, William Brevard
  • Patent number: 7731818
    Abstract: The present invention relates to a process for deinking waste paper comprising treating the waste paper with a peroxide compound in an aqueous alkaline medium in the presence of a first polymer (A) comprising a Ca-binding polymer in the form of a polycarboxylate polymer and a second polymer (B) comprising a poly-alfa-hydroxyacrylic acid or a salt thereof or the corresponding polylactone, said process additionally comprising treating the waste paper with at least one non-ionic surfactant or with at least one combination of a non-ionic surfactant and a fatty acid or a salt thereof to promote ink detachment and/or ink removal.
    Type: Grant
    Filed: June 16, 2005
    Date of Patent: June 8, 2010
    Assignee: Kemira Oyj
    Inventors: Bob Horacek, Jukka Jäkärä, Mikael Svedman
  • Publication number: 20100137514
    Abstract: A cationic starch graft copolymer is prepared by polymerization of 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) in the presence of 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: Application
    Filed: February 3, 2010
    Publication date: June 3, 2010
    Applicant: KEMIRA OYJ
    Inventors: Bernd Hauschel, Bernd Thiele, Thomas Hübbe, Bernhard Jansen
  • Patent number: 7727359
    Abstract: A thermosetting resin comprising a reacted A) first partially crosslinked glyoxalated polymer comprising a reacted (i) first polyacrylamide backbone and (ii) a first glyoxal component; and B) a second crosslinked glyoxalated polymer comprising a reacted (i) second polyacrylamide backbone and (ii) a second glyoxyal component; such that the first polyacrylamide backbone has a molecular weight that is less than the molecular weight of the second polyacrylamide backbone; and the first polyacrylamide backbone and the second polyacrylamide backbone have a weight ratio ranging from 75:25 to 95:5. Methods for making and using the resin. Fibrous substrates made with the resin.
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: June 1, 2010
    Assignee: Kemira Oyj
    Inventors: Robert Joseph Proverb, Lucyna M. Pawlowska
  • Publication number: 20100108277
    Abstract: Use of silica sols containing sulfonic acid groups and/or mercapto groups as microparticles in paper production, in particular for paper retention.
    Type: Application
    Filed: January 12, 2010
    Publication date: May 6, 2010
    Applicant: KEMIRA OYJ
    Inventors: Karlheinrich Meisel, Bernd Thiele, Gerd-Friedrich Renner, Johan Kijlstra, Arno Nennemann, Thomas Hubbe, Lothar Puppe
  • Patent number: 7708862
    Abstract: Use of silica sols containing sulfonic acid groups and/or mercapto groups as microparticles in paper production, in particular for paper retention.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: May 4, 2010
    Assignee: Kemira Oyj
    Inventors: Karlheinrich Meisel, Bernd Thiele, Gerd-Friedrich Renner, Johan Kijlstra, Arno Nennemann, Thomas Hübbe, Lothar Puppe
  • Patent number: 7674851
    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 8, The invention also relates to peroxide bleaching processes.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: March 9, 2010
    Assignee: Kemira OYJ
    Inventors: Jonni Ahlgren, Aarto Parén, Jukka Jäkärä, Timo Härmä, Ilkka Renvall
  • Publication number: 20100024886
    Abstract: Sizing solution delivery systems for a sizing press and methods for reducing sizing solution volumes generally include a service tank containing an untreated sizing solution (e.g., starch), a standpipe having a volume capacity of less than the service tank, and an auxiliary chemical tank downstream from the service tank and the standpipe. The standpipe is configured to collect overflow fluid from the size press during use. In this configuration, the volumes of overflow solution provided in the loop are shortened, which reduces sizing solution volumes needed during purging for paper grade changes. In addition, time and equilibrium cycles are concomitantly reduced. Also disclosed are methods for reducing the sizing solution volumes and/or increasing sizing efficiency with the sizing solution delivery systems.
    Type: Application
    Filed: July 29, 2009
    Publication date: February 4, 2010
    Applicant: KEMIRA CHEMICALS, INC.
    Inventor: William Daniel Seth
  • Patent number: 7608168
    Abstract: A process for whitening paper in a size press includes contacting a cellulose sheet with a size press liquor that contains a surface size and a particular whitener containing sulfonate groups and cations, M, wherein at least 10% of all cations M have the formula in which R5 to R7, independently of one another, denote hydrogen, a C1-C4-alkyl radical or an optionally further substituted C2-C4-hydroxyalkyl radical, and R8 denotes an optionally further substituted C2-C4-hydroxyalkyl radical. The process provides superior paper whitening compared to a corresponding process in which the whitener cations are all sodium or potassium ions.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: October 27, 2009
    Assignee: Kemira Oyj
    Inventors: Heinz Giesecke, Bernhard Hunke
  • Patent number: 7595034
    Abstract: The invention relates to a catalytic process for reducing nitrogen oxides in flue gases, in which process a reducing agent containing composition is mixed with flue gas and the mixture achieved is brought into contact with a catalyst. In accordance with the invention, the composition contains e.g. 1 to 60% of weight of ammonium formate. Especially a low freezing point can be achieved with such water containing composition. In addition, a good reduction conversion is achieved even at low temperatures.
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: September 29, 2009
    Assignee: Kemira Oyj
    Inventors: Timo Nissinen, Jari Kukkonen
  • Publication number: 20090229776
    Abstract: The invention relates to a tissue product comprising (a) tissue fibrous web incorporated throughout the tissue product; (b) a temporary wet strength agent capable of forming hemi-acetal bonds with the fibers of the web to prevent immediate degradation of the web when the tissue product contacts water; and (c) a composition containing a degrading agent selected from the group consisting of alkaline agents, oxidizing agents, nucleophilic agents, and combinations thereof; such that the tissue product has at least one surface and the degrading agent is located substantially throughout the surface of the fibrous web in an amount sufficient to make the fibrous web exhibit (i) an immediate wet tensile strength of at least 90% of the wet strength as compared to a web that does not contain a degrading agent and (ii) a wet soak decay that is at least a ten point improvement as compared to a tissue fibrous web that does not contain a degrading agent.
    Type: Application
    Filed: September 26, 2005
    Publication date: September 17, 2009
    Applicant: KEMIRA OYJ
    Inventors: Naijie Zhang, Michael Ryan
  • Publication number: 20090221704
    Abstract: The present invention relates to a process for the preparation of a solution comprising a first peroxy acid comprising performic acid and a second peroxy acid, said process comprising forming a carboxylic acid solution comprising a first carboxylic acid comprising formic acid, a second carboxylic acid and hydrogen peroxide, wherein the amount of formic acid is from 0.5 to 20% by weight of the amount of the second carboxylic acid, and allowing the components to react to form a solution comprising performic acid and said second peroxy acid, the amount of peroxy acids being at least 5% by weight. The invention also relates to a storable solution comprising performic acid and said second peroxy acid. The solution can be used as a disinfecting agent for controlling micro-organisms.
    Type: Application
    Filed: September 13, 2006
    Publication date: September 3, 2009
    Applicant: KEMIRA OYJ
    Inventors: Reijo Aksela, Ilka Renvall
  • Publication number: 20090220648
    Abstract: The present invention relates to a method for producing a co-granulate of mono calcium phosphate and gypsum comprising: providing a mixture of at least burnt lime and gypsum and granulating said mixture with an aqueous solution of phosphoric acid. The invention further relates to a granulate obtainable according to the above method for both compound feed and premixes. Further, according to the invention a mixture of at least CaCO3 and gypsum is granulated with an aqueous solution of phosphoric acid, wherein the temperature of the mixture during granulation is less than 90° C.
    Type: Application
    Filed: July 6, 2006
    Publication date: September 3, 2009
    Applicant: KEMIRA GROW HOW AB
    Inventors: Bernt Nilsson, Lars Persson
  • Publication number: 20090114357
    Abstract: The invention relates to a composition comprising a (a) a temporary wet strength agent component capable of forming hemi-acetal bonds with the fibers of a tissue web to provide initial wet strength, subsequent rapid degradation of the initial wet strength when the tissue web contacts water; and (b) a sizing agent component capable of imparting water-repelling properties to the tissue web; such that the strength agent component and the sizing agent component are present in sufficient amounts so that when the composition is added to a tissue pulp slurry during a tissue-making process, tissue made from the tissue-making process exhibits a combination of (1) improved initial wet tensile, (ii) improved decay, and (iii) absorbency.
    Type: Application
    Filed: September 26, 2005
    Publication date: May 7, 2009
    Applicant: KEMIRA OYJ
    Inventors: Michael Ryan, David Dauplaise, William Brevard
  • Publication number: 20090095431
    Abstract: Aqueous paper-sizing emulsions for bulk and surface sizing with a content of fatty acid anhydrides are described in which the fatty acid anhydrides are derived from unsaturated or saturated fatty acids or their mixtures with chain lengths of C12-C24 and are liquid under 50° C. The paper sizing emulsions additionally may contain another reactive or non-reactive sizing agent and/or a fixing agent containing aluminum ions. The new emulsions are suitable for the finishing of paper and cardboard.
    Type: Application
    Filed: December 22, 2006
    Publication date: April 16, 2009
    Applicant: KEMIRA CHEMIE GES.MBH
    Inventors: Johannes Fallmann, Marcel Sychra, Leo Schmid, Jurgen Sartori