Patents Assigned to Kemira Oyj
  • METHOD FOR TREATING WASTEWATER AND WASTEWATER SLUDGE USING A PERCARBOXYLIC ACID
    Publication number: 20200048118
    Abstract: The present invention provides a method for treating wastewater or wastewater sludge, in which method percarboxylic acid is used as an odor controlling agent and/or corrosion controlling agent.
    Type: Application
    Filed: November 17, 2017
    Publication date: February 13, 2020
    Applicant: Kemira Oyj
    Inventors: James Currie Allen, Tafadzwa Mariga
  • A METHOD AND SYSTEM FOR CONTROLLING HYDROPHOBIC CONDITIONS AND FOULING IN WATER INTENSIVE PROCESSES
    Publication number: 20200048126
    Abstract: In a water treatment system, a pretreatment chemical is added to water stream in a pretreatment process including a coagulation, flocculation and separation to reduce amount of dissolved and/or particulate matter in the water stream. Hydrophobic conditions in the water stream are monitored upstream or downstream from adding the pretreatment chemicals. Dosing of the pretreatment chemical to the water stream is controlled based on the monitored hydrophobic conditions. Thereby a membrane fouling in subsequent membrane filtration stage can be minimized.
    Type: Application
    Filed: October 6, 2017
    Publication date: February 13, 2020
    Applicant: KEMIRA OYJ
    Inventors: Mehrdad HESAMPOUR, Roderick ABINET, Marjatta PIIRONEN, Eija KORTE, liris JOENSUU
  • Method for controlling hydrophobic particles in aqueous environment in paper or board manufacture
    Patent number: 10550518
    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: Grant
    Filed: June 23, 2016
    Date of Patent: February 4, 2020
    Assignee: Kemira Oyj
    Inventors: Li Yan, Zeming Bai
  • Method for reducing pulp viscosity in production of dissolving pulp
    Patent number: 10513824
    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: Grant
    Filed: May 26, 2016
    Date of Patent: December 24, 2019
    Assignee: Kemira Oyj
    Inventors: Leif Robertson, Veli-Matti Vuorenpalo, Jonas Konn, Kaisa Kaski
  • Method and treatment system for treating mineral or oil sands tailings
    Publication number: 20190367389
    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: Application
    Filed: June 1, 2018
    Publication date: December 5, 2019
    Applicant: Kemira Oyj
    Inventors: Thomas Fenderson, Miguel Pelaez, Igal Maasen, Yuping Luo
  • Method for quantitative monitoring of endospores in aqueous environment of a paper or board mill
    Patent number: 10494679
    Abstract: The invention relates to a method for quantitative monitoring of bacterial endospores in an aqueous environment of a paper or board mill. The method comprises at least the following steps: obtaining at least a first aqueous sample originating from the industrial aqueous environment; destroying bacteria in vegetative form in the first sample by a suitable treatment, preferably by heating the first sample to a desired temperature; adding intercalating agent (such as PMA) to the treated first sample and allowing it to interact (e.g. by cross-linking) with the destroyed bacteria, so that the nucleic acid from the destroyed bacteria are unavailable for PCR; and determining the endospore level in the first sample by using quantitative polymerase chain reaction (qPCR) in which only the DNA from the endospores is available for amplification.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: December 3, 2019
    Assignee: Kemira Oyj
    Inventors: Kalle Riihinen, Marko Lauraeus, Marko Kolari, Juhana Ahola
  • Hydrotropic composition and its uses
    Publication number: 20190345392
    Abstract: A hydrotropic composition including at least one surface active cationic component, which is selected from a group of cholinium, guadinium or tetramethylguadinium, preferably cholinium, and a straight or branched carboxylate anion having at least six carbon atoms and its uses, for treating of oil sands or the like, for treating tailings from separation of bitumen, asphaltenes or the like.
    Type: Application
    Filed: January 11, 2018
    Publication date: November 14, 2019
    Applicant: Kemira Oyj
    Inventors: Alistair KING, Evangelos SKLAVOUNOS, Tiina LAAKSONEN, Antti RANTAMÄKI, Susanne WIEDMER, Lasse KYLLÖNEN, Suvi-Katriina RUOKONEN
  • Cleaning compositions and methods of cleaning equipment
    Publication number: 20190345418
    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: Application
    Filed: December 13, 2017
    Publication date: November 14, 2019
    Applicant: Kemira Oyj
    Inventors: Yong ZOU, Frank ZIMMERMANN
  • Method for producing paper
    Patent number: 10458068
    Abstract: A method for manufacturing paper is disclosed. A pulp slurry is produced, a paper sheet is formed from the slurry, an aldehyde functionalized polymer or polymers is added to the slurry before and/or after sheet formation, and a water soluble acid is added on the paper sheet.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: October 29, 2019
    Assignee: KEMIRA OYJ
    Inventors: Chen Lu, Junhua Chen, Clay Campbell, Scott Rosencrance, Jenna Sue Rabideau
  • Device and method for characterizing solid matter present in liquids
    Patent number: 10451605
    Abstract: The present invention relates to a device, system and method to measure tackiness of a substance, such as pulp, with an on-line or an in-line sensor having a transparent plate with a surface where tacky particles can attach. Attached particles are identified by a camera behind the plate. The camera is focused to detect stationary particles attached to the surface. Measurement is performed directly from a process stream or from a sidesteam and the plate does not need to be removed from the process for the measurement. The plate material may be plastic, such as polycarbonate or acrylic. Additionally, the flow speed may be kept be low, e.g. <0.1 m/s at the measurement position, and/or there may be a stagnation point of flow at or near measurement where the flow speed approaches zero.
    Type: Grant
    Filed: September 3, 2012
    Date of Patent: October 22, 2019
    Assignee: KEMIRA OYJ
    Inventor: Matti Hietaniemi
  • Method for producing paper, board or the like
    Publication number: 20190309476
    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: Application
    Filed: December 15, 2016
    Publication date: October 10, 2019
    Applicant: Kemira Oyj
    Inventors: Kaisa Karisalmi, Tom Lundin, Mikko Virtanen, Antti Laukkanen, Jason McKee
  • Method for producing paper
    Patent number: 10435843
    Abstract: A method for manufacturing paper is disclosed. A pulp slurry is produced, a paper sheet is formed from the slurry, an aldehyde functionalized polymer or polymers in combination with at least one additional strength additive is added to the slurry before and/or after sheet formation, and a water soluble acid is added on the paper sheet.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: October 8, 2019
    Assignee: KEMIRA OYJ
    Inventors: Chen Lu, Junhua Chen, Clay Campbell, Scott Rosencrance, Jenna Sue Rabideau
  • A method for increasing dimensional stability of a paper or a board product
    Publication number: 20190301100
    Abstract: The present invention relates to a process for producing a paper or a board product having increased dimension stability including providing a fibre slurry including never-dried fibres, treating the fibre slurry with a strength composition, and forming a paper or a board product from the treated fibre slurry, where the strength composition includes a permanent wet strength resin component and a sizing agent. The present invention further relates to a use of a strength composition for increasing dimensional stability of a paper and a board, and to a paper or a board product having improved dimensional stability.
    Type: Application
    Filed: September 19, 2017
    Publication date: October 3, 2019
    Applicant: Kemira Oyj
    Inventors: Jan-Luiken HEMMES, Jonathan (Yingshuang) WEI, Rongjun LU
  • CELLULOSIC BARRIER COMPOSITION COMPRISING ANIONIC POLYMER
    Publication number: 20190300677
    Abstract: A composition is provided comprising a) cellulose fibres having a number average length of from 0.001 to 0.5 mm and a specific surface area of from 1 to 100 m2/g; b) an at least partially hydrolysed vinyl acetate polymer; and c) at least one anionic polymer. The composition is useful in providing self-supporting films or coating layers for providing barriers to permeable substrates.
    Type: Application
    Filed: March 4, 2019
    Publication date: October 3, 2019
    Applicant: Kemira Oyj
    Inventors: Kerstin Malmborg, Anette Monica Heijnesson-Hultén, John Sandström
  • Polymer composition and its uses
    Publication number: 20190276578
    Abstract: A polymer composition includes a first host polymer, which is a copolymer of (meth)acrylamide and at least one cationic first monomer, and a second polymer, which is a copolymer of (meth)acrylamide and at least one cationic second monomer. The second polymer is polymerised in presence of the first host polymer, and the first host polymer has a higher cationicity than the second polymer, the difference in cationicity of the first host polymer and the second polymer being at least 3 mol-%, at least 5 mol-%, more preferably at least 7 mol-%. The polymer composition has a standard viscosity of >2.0 mPas, measured at 0.1 weight-% solids content in an aqueous NaCl solution (1 M), at 25° C., using Brookfield VII T viscometer with UL adapter. The invention relates also to uses of said polymer composition.
    Type: Application
    Filed: December 15, 2017
    Publication date: September 12, 2019
    Applicant: Kemira Oyj
    Inventors: Matti HIETANIEMI, Rosa CARCELLER, Asko KARPPI, Joonas LIKANDER
  • Sizing composition, its use and a method for producing paper, board or the like
    Patent number: 10407831
    Abstract: The invention relates to a composition for sizing of a surface of paper, board or the like and its use for increasing strength properties of paper, board or the like. The composition has a solids content of 3-30%, and it comprises degraded non-ionic starch, and at least 0.5 weight-% of anionic polyacrylamide, which has a molecular weight, MW, >500 000 g/mol and <2 500 000 g/mol and an anionicity in the range of 4-35 mol-%. The invention further relates also to a method for producing paper, board or the like, which comprises addition of a first strength composition, which comprises a cationic agent, to a fiber stock, formation of a fibrous web from the fiber stock, drying of the fibrous web to dryness of at least 60%, and application of a second strength composition, which comprises an anionic hydrophilic polymer and a starch component, on the surface of the fibrous web.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: September 10, 2019
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Jan-Luiken Hemmes, Vladimir Grigoriev, Asko Karppi
  • Method for preventing scale formation
    Patent number: 10392746
    Abstract: The present invention provides a method for preventing or decreasing scale formation on process surfaces in manufacturing process of paper, board or the like, in which method performic acid is used as an antiscaling agent.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: August 27, 2019
    Assignee: Kemira Oyj
    Inventors: Clayton Campbell, James Atkinson, Arkadiusz Zaniewski, Marko Kolari, Jaakko Ekman
  • PAPER STRENGTH IMPROVING POLYMER COMPOSITION AND ADDITIVE SYSTEM, USE THEREOF, AND MANUFACTURE OF PAPER PRODUCTS
    Publication number: 20190249370
    Abstract: A polymer composition including an anionic synthetic polymer, an anionic polysaccharide, including a strength additive system, a paper product and a method of production.
    Type: Application
    Filed: May 14, 2018
    Publication date: August 15, 2019
    Applicant: Kemira Oyj
    Inventors: Chen Lu, Jenna Rabideau
  • Composition for use as a paper strength agent
    Patent number: 10378154
    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: Grant
    Filed: April 19, 2016
    Date of Patent: August 13, 2019
    Assignee: Kemira Oyj
    Inventors: Yuping Luo, Jiang Li, Thomas J. Lynch, Jenna Sue Rabideau, Scott Rosencrance
  • Dry strength composition, its use and method for making of paper, board or the like
    Publication number: 20190242065
    Abstract: The invention relates to an aqueous dry strength composition suitable for use in manufacture of paper, board or the like. The composition includes a mixture of a synthetic polymer component, which is a copolymer of acrylamide and at least one anionic monomer, and a cationic starch component. The polymer component has an anionicity of 1-60 mol-%. The synthetic polymer component and cationic starch component provide the composition with a charge density in the range of 0.05-1 meq/g, when measured at pH 2.8, and 0.2-?3 meq/g, when measured at pH 7.0. The invention also relates to a method for making of paper, board or the like, where the dry strength composition is diluted with water, and the solution of the dry strength composition is added to the fibre stock before or after the addition of a cationic strength agent.
    Type: Application
    Filed: September 26, 2017
    Publication date: August 8, 2019
    Applicant: Kemira Oyj
    Inventors: Matti Hietaniemi, Asko Karppi, Mikko Virtanen