Patents Assigned to Kemira Oyj
  • Defoaming compositions
    Patent number: 10077392
    Abstract: Cement compositions and processes for reducing air entrainment in a cement composition generally include mixing a hydraulic cement with a defoamer compositions including one or more organic acid ester polymers selected from an organic acid ester of polyethylene oxide polymer, an organic acid ester of polypropylene oxide polymer, and a mixture thereof. The compositions may further comprise an organic acid ester of an ethylene oxide-propylene oxide block copolymer.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 18, 2018
    Assignee: Kemira Oyj
    Inventors: Amir H. Mahmoudkhani, Bava Luciana, Robert E. Wilson
  • CORE/SHELL POLYMER PARTICLES AS SURFACE SIZING AGENTS
    Publication number: 20180251945
    Abstract: The present invention provides a core/shell polymer particle for surface sizing of cellulosic products, wherein the core polymer and the shell polymer of the core/shell polymer particle are polymerized from monomers comprising at least 40%, by weight of monomers selected from branched C3-10-alkyl (meth)acrylate, styrene, linear C1-10-alkyl (meth)acrylate, and acrylonitrile, based on the total weight of the monomers of the core/shell polymer particle; provided that the polymer of the core/shell polymer particle comprises at least 40% by weight of branched C3-6-alkyl (meth)acrylate and at least 50% by combined weight of branched C3-10-alkyl (meth)acrylate and styrene, linear C1-10-alkyl (meth)acrylate, and/or acrylonitrile, based on the total weight of the monomers of the core/shell polymer particle.
    Type: Application
    Filed: September 2, 2016
    Publication date: September 6, 2018
    Applicant: Kemira Oyj
    Inventors: Anneli LEPO, Elsi TURUNEN, Tarja TURKKI, Bernhard ÜBERBACHER
  • Method for removing humic substances from an aqueous alkaline solution
    Publication number: 20180244549
    Abstract: A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises—obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and—adding a high cationic starch having a charge density value of at least 1.8 meq/g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.
    Type: Application
    Filed: August 31, 2016
    Publication date: August 30, 2018
    Applicant: Kemira Oyj
    Inventors: Jonni Ahlgren, Sakari Halttunen, Jussi Ruotsalainen, Maria Luhtala, Miia Niemelä
  • Method for reducing fouling of a microbial fuel cell, cleaning agent composition and its use
    Publication number: 20180248214
    Abstract: The invention relates to a method for reducing fouling in a microbial fuel cell. The method comprises feeding of an influent comprising organic substance(s) into the microbial fuel cell (MFC), which comprises an anode and a cathode connected through an external electrical circuit with each other. Organic substance(s) are converted into electrical energy in the microbial fuel cell by using microorganisms, such as exoelectrogenic bacteria, and a treated flow is removed from the microbial fuel cell. A cleaning agent composition is fed simultaneously with the influent to the microbial fuel cell. The invention relates also to the cleaning agent composition and its use.
    Type: Application
    Filed: August 24, 2016
    Publication date: August 30, 2018
    Applicant: Kemira Oyj
    Inventors: Mehrdad Hesampour, Hannele Havansi, Pirjo Vainio, Kirsi Kilponen
  • Prevention of starch degradation in pump, paper or board making processes
    Patent number: 10053818
    Abstract: The invention relates to biocidal systems comprising zinc ions and an oxidizing or non-oxidizing biocide, their use, and methods for preventing or decreasing starch degradation in starch-containing process waters from pulp, paper or board production processes.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: August 21, 2018
    Assignee: KEMIRA OYJ
    Inventors: Marko Kolari, Jaakko Ekman, Satu Ikävalko
  • Filler aggregate composition and its production
    Patent number: 10030335
    Abstract: The present invention relates to a filler aggregate composition comprising filler particles of ground calcium carbonate (GCC); a pretreatment agent selected from polyvinylamine (PVAM) and cationic polyacrylamide (CPAM), or a mixture thereof; and a nanofibrillar cellulose (NFC); wherein said filler aggregate composition is in the form of a slurry, wherein said pretreatment agent has an average molecular weight below 6000000 g/mol and a has a charge density below 7 meq/g, determined at pH 7, and the nanofibrillar cellulose is present in an amount of about 0.1-40% of the dry weight of the filler particles. Further it also relates to its method of production, and its use in stocks, paper and paper board.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: July 24, 2018
    Assignee: KEMIRA OYJ
    Inventors: Matti Hietaniemi, Mikko Virtanen
  • A method for producing a material with a network of at least two polymers, a product thereof and use of the product
    Publication number: 20180194906
    Abstract: The present invention relates to an interpenetrating polymer network (IPN) material comprising a copolymer of vinylamine-vinylformamide, and a homo-polymer or a copolymer of at least one monomer selected from acrylamide or derivatives thereof, acrylic acid or derivatives thereof, or a mixture thereof forming the IPN material together with the copolymer of vinylamine-vinyl-formamide. The present invention further relates to a process for producing the IPN material, and to use of the IPN material in paper industry.
    Type: Application
    Filed: May 11, 2016
    Publication date: July 12, 2018
    Applicant: Kemira Oyj
    Inventors: Rosa CARCELLER, Matti HIETANIEMI, Sacha LEGRAND, Mari ZABIHIAN
  • Method for controlling hydrophobic particles in aqueous environment in paper or board manufacture
    Publication number: 20180187374
    Abstract: The invention relates to a method for controlling hydrophobic particles in aqueous environment in paper or board manufacture. The method comprises preparing an aqueous stock comprising natural fibrous material, feeding the stock to a wire section, where a fibrous web is formed by draining excess water through a wire, and adding a control chemical to aqueous environment at least in one dosage point between the preparation of the stock and the exit of the web from the wire section. The control chemical comprises performic acid, which is added to the aqueous stock, which has consistency of at least 3 weight-%.
    Type: Application
    Filed: June 23, 2016
    Publication date: July 5, 2018
    Applicant: Kemira Oyj
    Inventors: Li Yan, Zeming Bai
  • Structured block copolymers
    Patent number: 10005873
    Abstract: New polyvinylamide and/or acryl acid-based copolymers. The new structured block copolymers are based on the block copolymerization of N-vinyl formamide (NVF) with other monomers by using a bifunctional initiator. Further, a method of preparing the structured block copolymer is provided, and especially a method wherein the NVF-based block is at least partially hydrolyzed to obtain PVAm. Also the use of the new structured block copolymers in sludge dewatering and in papermaking processes is disclosed.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: June 26, 2018
    Assignee: KEMIRA OYJ
    Inventors: Sacha Legrand, Marco Polverari, Rosa Carceller
  • Method for reducing pulp viscosity in production of dissolving pulp
    Publication number: 20180163344
    Abstract: The invention relates to a method for reducing pulp viscosity in production of dissolving pulp. The method comprises producing cellulose pulp, whereby the obtained cellulose pulp has a cellulose content of at least 90%, and bleaching the obtained cellulose pulp. The cellulose pulp is treated after bleaching with performic acid.
    Type: Application
    Filed: May 26, 2016
    Publication date: June 14, 2018
    Applicant: Kemira Oyj
    Inventors: Leif Robertsen, Veli-Matti Vuorenpalo, Jonas Konn, Kaisa Kaski
  • Surfactant composition and method for treating bitumen froth
    Publication number: 20180155628
    Abstract: The invention relates to a surfactant composition comprising an ionic liquid prepared from an unsubsituted or substituted primary, secondary or tertiary amine, or from an unsubstituted or substituted pyridine, amidine or guanidine with at least one fatty acid and/or resin acid. The invention also relates to a method for treating bitumen froth from a separation process, where bitumen is separated from mineral solids. The method comprises addition of said surfactant composition to the diluent and/or to the froth before phase separation.
    Type: Application
    Filed: June 10, 2016
    Publication date: June 7, 2018
    Applicant: Kemira Oyj
    Inventors: Lasse Kyllönen, Sukhjit Aujla, Frances Fournier, Thomas Fenderson, Alistair King, Evangelos Sklavounos
  • Optical determination of anionic charge in a process stream
    Patent number: 9989476
    Abstract: The present invention concerns a method of optical measurement of an aqueous stream, and of processing the results of the measurement in order to determine the anionic charge of the stream, the method being carried out by measuring the light absorption of the stream and predicting the amount of anionic groups in the stream using a mathematical processing, such as mathematical calculations. Particularly, the method includes the steps of adding an amount of a cationic dye to the aqueous stream, measuring the light absorption spectra of the obtained dye-containing stream, and processing the obtained light absorption spectrum using said mathematical processing in order to obtain the anionic charge. The invention also concerns the use of the obtained spectrum in determining the turbidity of the stream, as well as a device suitable for use in carrying out the method.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: June 5, 2018
    Assignee: KEMIRA OYJ
    Inventors: Lari Vähäsalo, Iiris Joensuu, Marjatta Piironen
  • Use of a strength composition for increasing wet dimensional stability of a moulded pulp article
    Publication number: 20180148894
    Abstract: The invention relates to a use of a strength composition for increasing wet dimensional stability of a moulded pulp article. The moulded pulp article is produced by a method which comprises obtaining a fibre slurry and feeding it to a forming tank of a moulding apparatus, forming a moulded pulp article from the fibre slurry, and drying the moulded pulp article. The strength composition comprises at least one permanent wet strength resin and the strength composition is added to the fibre slurry before the forming of the moulded pulp article.
    Type: Application
    Filed: April 21, 2016
    Publication date: May 31, 2018
    Applicant: Kemira Oyj
    Inventors: Jan-Luiken HEMMES, Jonathan WEI, Rongjun LU
  • Papermaking agent composition and method for treating fibre stock
    Patent number: 9982394
    Abstract: The invention relates to a papermaking agent composition, preferably in powder form, which comprises a water-soluble polymer, which comprises 21-30 mol-% of vinylamine units and has an average molecular weight of at least 1 000 000 Da. The invention relates also to a method for treating of fiber stock in manufacture of paper, board or the like, where a thick fiber stock is obtained, it is diluted to a thin fiber stock having a consistency <3% by addition of water, and the thin fiber stock is drained and a continuous fibrous web is formed. The papermaking agent composition is added to the thick fiber stock or to the thin fiber.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: May 29, 2018
    Assignee: Kemira Oyj
    Inventors: Joonas Hokka, Matti Hietaniemi, Sacha Legrand, Marco Polverari
  • Method and device for monitoring and controlling the state of a process stream
    Patent number: 9970919
    Abstract: The present invention concerns a method of estimating and optionally controlling the microbiological state in a process stream of an industrial process by measuring the concentration of dissolved oxygen or the rH value, or both, in said stream, the method including continuous or periodic sampling and online measurement. The invention also concerns a device suitable for use in implementing said method.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: May 15, 2018
    Assignee: KEMIRA OYJ
    Inventors: Pekka Ilmola, Kaj Jansson, Iiris Joensuu, Marjatta Piironen
  • Method for determining a scale inhibitor concentration in a sample
    Patent number: 9958389
    Abstract: The invention relates to a method for determining a scale inhibitor concentration in a sample comprising at least a first scale inhibitor, which is a synthetic organic compound comprising at least one ionized group. The method comprises optionally diluting and/or purifying the sample, and allowing the sample to interact with a reagent comprising a lanthanide(III) ion. The sample is excited at a first excitation wavelength and a sample signal deriving from the lanthanide(III) ion is detected at a signal wavelength by using time-resolved luminescence measurement, and the concentration of the at least first scale inhibitor in the sample is determined by using the detected sample signal.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: May 1, 2018
    Assignee: KEMIRA OYJ
    Inventors: Vesa Nuutinen, Susanna Toivonen, James Johnstone, Harri Härmä, Paul Mundill
  • A composition for use as a paper strength agent
    Publication number: 20180105988
    Abstract: The present disclosure relates to a method and composition for increasing wet and/or dry strength of a paper product. The method comprises adding a composition comprising at least one polymer having a molecular weight more than 0.5 million Dalton and a degradation agent to a pulp suspension, and forming said paper product.
    Type: Application
    Filed: April 19, 2016
    Publication date: April 19, 2018
    Applicant: Kemira Oyj
    Inventors: Yuping LUO, Jiang LI, Thomas J. LYNCH, Jenna Sue RABIDEAU, Scott ROSENCRANCE
  • Method for improving rheological properties of mineral slurry
    Patent number: 9919319
    Abstract: A method for improving the rheological properties of mineral slurry comprising adding a copolymeric dispersing agent to the slurry to disperse silicate minerals. Also disclosed is a method for flotating mineral slurry.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: March 20, 2018
    Assignee: Kemira Oyj
    Inventors: Lucas R. Moore, Mika Martikainen
  • Breakers containing iron compounds and their methods of use
    Patent number: 9920241
    Abstract: Methods and well treatment fluids for fracturing a subterranean formation penetrated by a well bore are provided, the method comprising injecting a well treatment fluid into the well bore at a pressure and flow rate sufficient to fracture the subterranean formation, wherein the well treatment fluid comprises an iron-containing breaker compound. The methods can be used to reduce viscosity of well treatment fluids.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: March 20, 2018
    Assignee: Kemira Oyj
    Inventors: Jiang Li, Roopa Tellakula, Tom Lynch, Harsha Kolla, Logan Jackson
  • Tagged scale inhibiting polymer compositions and methods of inhibiting scale formation
    Patent number: 9902904
    Abstract: Scale-inhibiting polymers comprising one or more scale-inhibiting units and one or more tagging units, wherein each tagging unit is formed from a compound of Formula I, II, III, or IV, or a salt, hydrate, salt hydrate, stereoisomer, dehydrate or derivative thereof. Scale-inhibiting compositions comprising the scale-inhibiting polymers, processes for determining a concentration of a scale-inhibiting polymer for inhibiting scale formation, and methods for preventing or controlling scale formation in systems comprising fluid circulation with the scale-inhibiting polymers are also disclosed herein.
    Type: Grant
    Filed: January 7, 2015
    Date of Patent: February 27, 2018
    Assignee: Kemira Oyj
    Inventors: Vesa Nuutinen, Susanna Toivonen