Patents Assigned to Kemira
  • A polymer product for improving retention of hydrophobic internal sizing agents in manufacture of paper or board
    Publication number: 20200291581
    Abstract: A method for manufacturing paper or board is disclosed and further disclosed is an internal sizing system for providing improved retention of hydrophobic internal sizing agents. The internal sizing system includes a hydrophobic internal sizing agent as a first component selected from a group consisting of alkenyl succinic anhydride (ASA), alkyl ketene dimer (AKD), rosin sizes and any combination thereof, and a water-soluble polymer product including amphoteric polyacrylamide as a second component, which amphoteric polyacrylamide has neutral or cationic net charge at pH 7, a weight-average molecular weight of 700,000-18,000,000 g/mol and a total ionicity of 4-28 mol-%, where the first component and the second component are provided as separate components or as a combination of the first component and the second component.
    Type: Application
    Filed: October 31, 2018
    Publication date: September 17, 2020
    Applicant: Kemira Oyj
    Inventors: Timo Valkealaakso, Simo-Pekka Vanninen, Asko Karppi
  • Method and treatment system for treating mineral or oil sands tailings
    Patent number: 10773977
    Abstract: A method for treating tailings substrate from mining or oil sands separation process, the tailings substrate comprising an aqueous phase with suspended solid particulate material. In the method, a flocculating agent is added to the tailings substrate, flocs are allowed to form and the formed flocs are separated from the aqueous phase. The flocculating agent comprises a degraded polyacrylamide comprising at least anionic units and having a process water viscosity reduced by 25-99%, preferably 50-99%, compared to a substantially similar polyacrylamide that has not been degraded by a degradation agent, measured at a shear rate 1 s?1 as a 0.4-0.8 weight-% solution of polymer in process water.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: September 15, 2020
    Assignee: KEMIRA OYJ
    Inventors: Thomas Fenderson, Miguel Pelaez, Igal Maasen, Yuping Luo
  • Method for producing paper, board or the like
    Patent number: 10767312
    Abstract: The invention relates to a method for producing paper, board or the like. The method comprises obtaining a thick stock comprising cellulose fibres, forming a fibrous web and drying of drying the fibrous web. A strength agent system, which comprises at least one synthetic or natural polymer, or their mixture, and microfibrillated parenchymal cellulose material originating from non-wood sources, is added to the thick stock. The invention relates also to paper or board produced by the method.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: September 8, 2020
    Assignee: Kemira Oyj
    Inventors: Kaisa Karisalmi, Tom Lundin, Mikko Virtanen, Antti Laukkanen, Jason McKee
  • Method and treatment system for making of paper
    Patent number: 10767317
    Abstract: The invention relates to a method and treatment system for making of paper or surface ply of a multi-ply board from a fibre suspension, where at least 90 weight-% of fibres originate from chemical pulping process, chemi-thereto mechanical pulping process and/or office waste deinking pulping process. The fibre suspension further comprises inorganic mineral particles and cationic starch. A cationic copolymer of acrylamide and cationic monomers is incorporated to the fibre suspension and it is allowed to interact by flocculation with at least some of the said components of the fibre suspension. An anionic copolymer of acrylamide and more than 30 mol-% of anionic monomers is added to the fibre suspension, and fibre suspension is formed into a fibre web and drying the web to a dryness of at least 80%. An aqueous surface composition comprising polymeric binder is applied on the surface of the web.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: September 8, 2020
    Assignee: KEMIRA OYJ
    Inventors: Josep Lluis Bisbal, Daniel Nuno da Rita Santos, Matti Hietaniemi
  • System and method for manufacture of paper, board or the like
    Patent number: 10767315
    Abstract: Drainage and press dewatering system for manufacture of paper, board or the like, comprising (a) amphoteric polyacrylamide, which is a copolymer obtained by polymerizing (meth)acrylamide and 1-80 mol-% of cationic monomers and/or 0.1-70 mol-% of anionic monomers, the polyacrylamide having an intrinsic viscosity in the range of 6-38 dl/g, (b) inorganic microparticles of siliceous material, such as colloidal silica or bentonite, and (c) a high-charged cationic coagulant having a charge density over 5 meq/g and preferably over 6 meq/g determined at pH 6 and selected from aluminium based coagulants, organic polymers and mixtures thereof.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: September 8, 2020
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Asko Karppi
  • A METHOD AND SYSTEM FOR DETERMINATION OF STARCH IN A SAMPLE
    Publication number: 20200278293
    Abstract: In a starch concentration measurement, a liquid sample is conducted from a liquid sample such as pulp suspension or filtrate of a paper, board or tissue process. An iodine solution is added to the sample, and a light absorbance or transmittance of the sample is measured at a wavelength longer than about 650 nm, for example longer than about 700 nm. The measured absorbance or transmittance of the sample is converted into the starch concentration of the sample by a predefined correlation between a starch concentration and a light absorbance or transmittance.
    Type: Application
    Filed: March 24, 2017
    Publication date: September 3, 2020
    Applicant: KEMIRA OYJ
    Inventors: Lari VÄHÄSALO, Marjatta PIIRONEN, Iiris JOENSUU
  • Functionalized magnetic nanoparticles and a method for preparation thereof
    Patent number: 10726981
    Abstract: The present disclosure relates to a method for manufacturing a covalently functionalized coated magnetic nanoparticle and to said particles and uses thereof. The preparation method includes forming a shell of a hydrophilic polymer coating layer on top of a magnetic metal core coated with a carbon coating. In the method a particle comprising a magnetic metal core coated with a carbon coating is provided. The surface of the particle is subjected to covalent functionalization by generating amino reactive groups via diazonium chemistry and subsequently an irreversible attachment of an atom transfer radical polymerization (ATRP) initiator is carried out on said surface. A hydrophilic polymer layer is formed) by a surface initiated atom transfer radical polymerization (SI-ATRP) reaction with a monomer comprising N-isopropylacrylamide (NIPAM).
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: July 28, 2020
    Assignee: Kemira Oyj
    Inventors: Mehrdad Hesampour, Lasse Kyllönen, Ari Auvinen, Adina Anghelescu-Hakala
  • Process for the Preparation of a Mixture of Chelating Agents, Mixture of Chelating Agents and Methods of Using Them
    Publication number: 20200223786
    Abstract: The present invention relates to a process for the in situ preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine with maleic acid and then with 2-halocarboxylic acid, mixtures obtainable using said process and mixtures of chelating agents. In addition, the invention relates to methods where such mixtures are used.
    Type: Application
    Filed: June 27, 2018
    Publication date: July 16, 2020
    Applicant: Kemira Oyj
    Inventors: Reijo AKSELA, Jonas KONN, Anna-Maija PERANDER, Anna HAARALA, Riitta ILMONIEMI, Hanna HOFFREN
  • A METHOD AND SYSTEM FOR OPTIMIZATION OF COAGULATION AND/OR FLOCCULATION IN A WATER TREATMENT PROCESS
    Publication number: 20200223719
    Abstract: Methods and systems are disclosed for optimization of coagulation and/or flocculation in a water treatment process. According to exemplary embodiments, samples are taken from an aqueous liquid and the samples are monitored with an imaging device to capture visual data of particles dispersed or suspended in the liquid. The particles are classified into particle types based on the visual data and a particle size distribution indication is computed for each classified particle type. The particle size distribution indication is then compared to a predetermined particle size distribution value, and in response to a difference detected, dosage of at least one coagulation and/or flocculation agent in the water treatment process can be adjusted.
    Type: Application
    Filed: March 31, 2017
    Publication date: July 16, 2020
    Applicant: KEMIRA OYJ
    Inventors: Marjatta Piironen, Iiris Joensuu, Mehrdad Hesampour
  • Improving sludge dewaterability and energy balance of wastewater treatment
    Patent number: 10703662
    Abstract: The present invention relates to a process for treating primary sludge in a wastewater treatment plant, comprising the steps of admixing an organic coagulant and/or polymer to wastewater; allowing a primary treatment of the wastewater in the presence of the organic coagulant or polymer; separating solids as a primary sludge from said primary treatment; and dewatering the primary sludge. The present invention further relates to a method of improving primary sludge dewaterability and improving energy balance of a wastewater treatment plant.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: July 7, 2020
    Assignee: Kemira Oyj
    Inventors: Joonas Likander, Sakari Halttunen, Outi Grönfors, Bengt Hansen
  • Method for controlling growth of microorganisms and/or biofilms in an industrial process
    Publication number: 20200199818
    Abstract: Disclosed is a method for controlling a biofilm, removing a formed biofilm and/or controlling a growth of microorganisms, preferably bacteria, in an aqueous environment of an industrial manufacturing process including a cellulosic fibre material.
    Type: Application
    Filed: August 28, 2018
    Publication date: June 25, 2020
    Applicant: Kemira Oyj
    Inventors: Jaakko Simell, Marko Kolari, Jonas Konn
  • Boosters for breakers containing iron compounds
    Patent number: 10689565
    Abstract: Methods for fracturing a subterranean formation penetrated by a well bore are provided, the method comprising the step of 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 one or more iron-containing compounds and one or more booster compounds. The methods can be used to reduce viscosity and to facilitate the decomposition of acrylamide-containing polymers.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: June 23, 2020
    Assignee: Kemira OYJ
    Inventors: Jiang Li, Roopa Tellakula
  • Process for the preparation of arylsulfonylpropenenitriles by photocatalytic reactions
    Publication number: 20200190026
    Abstract: A process for a preparation of arylsulfonylpropenenitriles is disclosed. A reaction starting from arylsulfonyl iodides is catalyzed by light. The process is scalable, environmentally benign and provides the product in good yield.
    Type: Application
    Filed: August 27, 2018
    Publication date: June 18, 2020
    Applicant: Kemira Qyj
    Inventors: Toni AALTONEN, Oili KALLATSA, Jaakko SIMELL, Nina SNEIZ, Jonas KONN, Jaakko HILTUNEN, Ari KOSKINEN
  • Coating structure, sheet-like product and its use
    Publication number: 20200190741
    Abstract: A coating structure for a sheet-like substrate, which includes lignocellulosic fibres is disclosed. The structure includes at least one pre-coat layer including at least 70 weight-% of a first styrene (meth)acrylate copolymer polymerised in the presence of a stabiliser, having a glass transition temperature Tg ?20° C. preferably ?10° C., ?30 weight-% of inorganic platy mineral particles and 0.01-2 weight-% of at least one first thickener. The coating structure further includes a top coat layer including at least 50 weight-% of a second styrene (meth)acrylate copolymer polymerised in the presence of a stabiliser having a glass transition temperature Tg ?20° C. preferably ?10° C., ?30 weight-% of inorganic mineral particles, 0.01-5 weight-% of at least one second thickener and 0.5-30 weight-% of an antiblocking agent. Further disclosed is a sheet-like product coated with the coating structure.
    Type: Application
    Filed: June 14, 2018
    Publication date: June 18, 2020
    Applicant: Kemira Oyj
    Inventor: Tarja Turkki
  • Process for the Preparation of a Mixture of Chelating Agents, Mixture of Chelating Agents and Methods of Using Them
    Publication number: 20200181063
    Abstract: The present invention relates to a process for in situ the preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine derivatives with maleic acid and then with 2-halocarboxylic acid, to mixtures of chelating agents and methods using such chelating agents.
    Type: Application
    Filed: June 27, 2018
    Publication date: June 11, 2020
    Applicant: Kemira Oyj
    Inventors: Reijo AKSELA, Jonas KONN, Anna-Maija PERANDER, Anna HAARALA, Riitta ILMONIEMI, Hanna HOFFREN
  • Agglomerated hemicellulose compositions, methods of preparation thereof, and processes for enriching a desired mineral from an ore
    Patent number: 10661282
    Abstract: Methods for preparing agglomerated hemicellulose compositions are provided. Agglomerated hemicellulose compositions comprising agglomerates are also provided herein. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral, wherein the process comprises carrying out a flotation process in the presence of one or more collecting agents and a depressant composition comprising an agglomerated hemicellulose composition.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: May 26, 2020
    Assignee: KEMIRA OYJ
    Inventors: Duane C. Wilson, Xihui Yin, Stephanie Kofsky-Wofford, Anna I. Casasús
  • Method for removing humic substances from an aqueous alkaline solution
    Patent number: 10662092
    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: Grant
    Filed: August 31, 2016
    Date of Patent: May 26, 2020
    Assignee: 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
    Patent number: 10651491
    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: Grant
    Filed: August 24, 2016
    Date of Patent: May 12, 2020
    Assignee: Kemira Oyj
    Inventors: Mehrdad Hesampour, Hannele Havansi, Pirjo Vainio, Kirsi Kilponen
  • Method for producing paper, board or the like
    Publication number: 20200141061
    Abstract: The invention relates to a method for producing paper, board or the like. The method comprises obtaining a fibre stock comprising lignocellulosic fibres and adding a retention agent system comprising a cationic synthetic polymer to the fibre stock and forming a fibrous web from the fibre stock and drying the web. Microfibrillated non-wood cellulose is added to the fibre stock as a component of the retention agent system and sequentially with the cationic synthetic polymer.
    Type: Application
    Filed: March 29, 2018
    Publication date: May 7, 2020
    Applicant: Kemira Oyj
    Inventors: Tom Lundin, Kaisa Karisalmi, Heikki Sojakka
  • Core/shell polymer particles as surface sizing agents
    Patent number: 10640926
    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: Grant
    Filed: September 2, 2016
    Date of Patent: May 5, 2020
    Assignee: KEMIRA OYJ
    Inventors: Anneli Lepo, Elsi Turunen, Tarja Turkki, Bernhard Überbacher