Patents Assigned to Kemira Oyj
  • Publication number: 20220146396
    Abstract: A sample of an aqueous stream is conducted to an optical measurement device. A hydrophobic dye is added. The sample is fractionated into fractions according to particle size or mass. The fluorescence intensity values and light scattering intensity values for the fractions are measured. The fluorescence intensity values of the fractions are added together thus obtaining a sum of the fluorescence intensity values. The light scattering intensity values of the fractions are added together, thus obtaining a sum of the light scattering intensity values. A hydrophobicity density of the particles in the sample, is calculated by dividing the sum of the fluorescence intensity values with the sum of the light scattering intensity values, and the concentration of hydrophobic contaminants in the aqueous stream is monitored and controlled based on the calculated hydrophobicity density of the particles in the sample.
    Type: Application
    Filed: December 20, 2019
    Publication date: May 12, 2022
    Applicant: KEMIRA OYJ
    Inventors: Iiris JOENSUU, Marjatta PIIRONEN, Andy BERGERON, Travis BJERKETVEDT
  • Patent number: 11299409
    Abstract: Provided herein are liquid polymer (LP) compositions comprising an acrylamide (co)polymer, as well as methods for preparing inverted polymer solutions by inverting these LP compositions in an aqueous fluid. The resulting inverted polymer solutions can have a concentration of acrylamide (co)polymer of from about 50 to about 15,000 ppm, and a filter ratio of 1.5 or less at 15 psi using a 1.2 ?m filter. Also provided are methods of using these inverted polymer solutions in dewatering, clarification, flocculation and/or thickening applications, and the like.
    Type: Grant
    Filed: December 7, 2016
    Date of Patent: April 12, 2022
    Assignees: KEMIRA OYJ, CHEVRON U.S.A. INC.
    Inventors: Logan Jackson, Thomas J. Lynch, Ronald Robinson, Frances Fournier, Hong Yang, Sukhjit Aujla, Do Hoon Kim, Dennis Arun Alexis, Varadarajan Dwarakanath, David Espinosa, Taimur Malik
  • Patent number: 11279866
    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: June 23, 2020
    Date of Patent: March 22, 2022
    Assignee: KEMIRA OYJ
    Inventors: Jiang Li, Roopa Tellakula
  • Publication number: 20220073660
    Abstract: The invention relates to a polymer having a main chain which is obtained by free radical emulsion polymerisation of a monomer mixture, which comprises at least one optionally substituted styrene, at least one C1-C4 alkyl (meth) acrylate and at least one ethylenically unsaturated monomer. The monomer mixture is polymerised in a reaction mixture comprising a natural and/or synthetic polymeric stabilator. According to the invention the polymer main chain further comprises a reaction product of silica sol and an unsaturated organosilicon compound. The invention relates also to methods of making such polymer.
    Type: Application
    Filed: December 27, 2018
    Publication date: March 10, 2022
    Applicant: KEMIRA OYJ
    Inventors: Xiaoyu CHEN, Xuan LI
  • Patent number: 11266973
    Abstract: The invention relates to an arrangement for continuous production of polymer including a polymerisation reactor. The reactor includes a first pulley and a second pulley arranged at a distance from each other, which distance, defining a longitudinal first direction, and a flexible endless belt having a first edge section and a second edge section, which belt, is arranged to travel over the first pulley and the second pulley as a flat belt. The reactor further includes a supporting structure, which is arranged to support the flexible endless belt between the first pulley and the second pulley, whereby the supporting structure is arranged to form the flexible endless belt into a trough section by deviating the first edge section and the second edge section of the flexible endless belt away from the first direction. The trough section has a width-to-height ratio <1.2.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: March 8, 2022
    Assignee: KEMIRA OYJ
    Inventors: David Goult, Simon Naylor, Dave Tuff
  • Publication number: 20220056641
    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: February 24, 2022
    Applicant: Kemira Oyj
    Inventors: Jaakko Simell, Marko Kolari, Jonas Konn
  • Patent number: 11242654
    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: Grant
    Filed: June 14, 2018
    Date of Patent: February 8, 2022
    Assignee: Kemira Oyj
    Inventors: Tarja Turkki, Anneli Lepo
  • Patent number: 11242492
    Abstract: The present embodiments generally relate to methods for the treatment of tailings, e.g., oil sands tailings, including methods comprising the use of one or more flocculants, one or more coagulants and one or more oxidants to treat said tailings and/or to improve the performance of said one or more flocculants.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: February 8, 2022
    Assignee: KEMIRA OYJ
    Inventors: Miguel Pelaez, Thomas Fenderson
  • Patent number: 11242653
    Abstract: A strength additive system for manufacturing paper, board, tissue or the like includes preferably as separate components, a cationic strength agent, such as a cationic polymer with aldehyde functional groups, and an anionic copolymer obtained by polymerization of a reaction mixture including (meth)acrylamide and anionic monomers, the standard viscosity of the obtained copolymer being in a range of 1.5-5.0 mPas. A method for manufacturing of a paper, board, tissue or the like is further disclosed.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: February 8, 2022
    Assignee: Kemira Oyj
    Inventors: Logan Jackson, Chen Lu, Jenna Rabideau
  • Patent number: 11242423
    Abstract: The present invention relates to a surface sizing composition comprising a metal salt, wherein the metal has at least 3 valence electrons, and an aqueous polymer dispersion, wherein the aqueous polymer dispersion is an aqueous polymer dispersion (A) obtainable by free radical emulsion copolymerizing a first ethylenically unsaturated monomer blend comprising (a) 0 to 75% by weight of at least one optionally substituted styrene, (b) 15 to 100% by weight of at least one C1-C4-alkyl (meth)acrylate, and (c) 0 to 10% by weight of other ethylenically unsaturated copolymerizable monomers, wherein the sum (a)+(b)+(c) is 100%, in the presence of a water-soluble redox system comprising a first free radical initiator for the free radical emulsion copolymerization and an aqueous prepolymer composition (B) obtainable by free radical emulsion copolymerizing in a polymerization solvent comprising C1-6-carboxylic acid and C1-6-carboxylic acid anhydride, a second ethylenically unsaturated monomer blend comprising (i) 5 to 50%
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: February 8, 2022
    Assignee: Kemira Oyj
    Inventors: Anneli Lepo, Tarja Turkki, Elsi Turunen
  • Patent number: 11225456
    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: Grant
    Filed: June 27, 2018
    Date of Patent: January 18, 2022
    Assignee: Kemira Oyj
    Inventors: Reijo Aksela, Jonas Konn, Anna-Maija Perander, Anna Haarala, Riitta Ilmoniemi, Hanna Hoffren
  • Publication number: 20220009807
    Abstract: A method is disclosed for monitoring and controlling treatment of a waste water stream. The method includes measuring UV absorbance of a waste water influent and/or waste water effluent, measuring turbidity of the waste water influent and/or waste water effluent, and determining the concentration of dissolved organics in the waste water influent and/or waste water effluent based on the measured UV absorbance. The method includes controlling the dosing of at least one coagulant to the waste water influent based on the measured UV absorbance and/or the determined concentration of the dissolved organics, and optionally based on the measured turbidity, and optionally controlling the dosing of at least one flocculant to the waste water influent based on the measured turbidity.
    Type: Application
    Filed: November 14, 2019
    Publication date: January 13, 2022
    Applicant: Kemira Oyj
    Inventors: Marjatta PIIRONEN, Sakari HALTTUNEN, Iiris JOENSUU, Anne MÄKI
  • Patent number: 11214927
    Abstract: A method is disclosed for increasing strength properties, preferably burst strength and SCT strength, of a paper or board product. The paper or board product is manufactured from a fibrous web produced by a multilayer headbox, where an aqueous layer is formed between at least a first and a second fibre layer formed from fibrous stock suspension(s), and where feed water for the aqueous layer includes at least one cationic polymer. The method of the invention includes adding an anionic additive selected from a group comprising anionic synthetic organic polymers, anionic polysaccharides, and any of their combinations to the feed water before formation of the aqueous layer.
    Type: Grant
    Filed: June 13, 2018
    Date of Patent: January 4, 2022
    Assignee: Kemira Oyj
    Inventors: Mikko Virtanen, Kimmo Strengell, Juan Cecchini, Matti Hietaniemi
  • Patent number: 11208766
    Abstract: A surface treatment composition is disclosed including anionic polyacrylamide, which has a weight average molecular weight, MW, in the range of 100 000-2 000 000 g/mol, and free glyoxal. Further disclosed is a use of the surface treatment composition, a method for producing paper, board or the like and a paper product.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: December 28, 2021
    Assignee: Kemira Oyj
    Inventors: Yuping Luo, Junhua Chen, Zheng Dang, Jennifer Riser
  • Patent number: 11203733
    Abstract: Compositions for cleaning equipment, preferably paper or carpet making equipment, and methods of cleaning equipment, preferably paper or carpet making equipment using the said composition. The cleaning composition comprises of one or more fatty acid methyl esters, preferably vegetable oil methyl ester, more preferably soybean oil methyl ester, one or more alkene carbonate, preferably propylene carbonate; one of more surfactants, preferably nonionic surfactants; and one or more glycol ether and/or dibasic ester containing solvents.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: December 21, 2021
    Assignee: Kemira Oyj
    Inventors: Yong Zou, Frank Zimmermann
  • Patent number: 11160282
    Abstract: The invention relates to use of a composition comprising a cationic surfactant, which comprises a primary or secondary ammonium head group and a linear unsubstituted C12-alkyl tail, for inducing germination of bacterial endospores in pulp suspension for making of paper, board or the like. The invention relates also to a method for quantitatively reducing bacterial endospores in pulp suspension for making of paper, board or the like. The method comprises obtaining of aqueous pulp suspension, and administering the said composition to the pulp suspension. The cationic surfactant is allowed to interact with bacterial endospores in the pulp suspension. Germination of endospores and destroying microorganisms is thus induced.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: November 2, 2021
    Assignee: Kemira Oyj
    Inventors: Juhana Ahola, Marko Kolari
  • Patent number: 11162221
    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: Grant
    Filed: March 29, 2018
    Date of Patent: November 2, 2021
    Assignee: Kemira Oyj
    Inventors: Tom Lundin, Kaisa Karisalmi, Heikki Sojakka
  • Publication number: 20210301473
    Abstract: The invention relates to a use of a water-soluble polymer product comprising amphoteric polyacrylamide, which has neutral or cationic net charge at pH 7, a weight-average molecular weight of 2 500 000-18 000 000 g/mol and a total ionicity of 4-28 mol-%. The polymer product is used for controlling deposit formation caused by hydrophobic substances in manufacture of paper or board, where a fibre web is formed from an aqueous suspension of fibres. The invention relates also to a method for controlling deposit formation caused by hydrophobic substances in manufacture of paper or board, where a fibre web is formed from an aqueous suspension of fibres, as well as to produced paper or board.
    Type: Application
    Filed: November 22, 2017
    Publication date: September 30, 2021
    Applicant: KEMIRA OYJ
    Inventors: Matti Hietaniemi, Asko Karppi, Maarit Latvanen, Elsa Olmos
  • Patent number: 11130687
    Abstract: The present invention relates to a coagulant composition comprising a coagulant and a carbon source compound, wherein the coagulant is selected from the group iron and aluminium salts, or any combination thereof. The carbon source includes methanol, ethanol or glycol. The present invention further relates to a method of treating wastewater, e.g. containing nitrogen and/or phosphate, including providing the coagulant composition to wastewater before, during and/or after a biological treatment step, and the use of the coagulant composition in wastewater treatment.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: September 28, 2021
    Assignee: KEMIRA OYJ
    Inventor: Vesa Kettunen
  • Patent number: 11131062
    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: July 16, 2020
    Date of Patent: September 28, 2021
    Assignee: Kemira Oyj
    Inventors: Kaisa Karisalmi, Tom Lundin, Mikko Virtanen, Antti Laukkanen, Jason McKee