Patents Assigned to Kemira
  • A METHOD FOR MEASURING DISINTEGRATION OF A FIBROUS PRODUCT
    Publication number: 20200116620
    Abstract: The present invention provides a method and system for measuring disintegration of a fibrous product. The method comprises disintegration of a sample of the fibrous product in an aqueous solution, optionally promoted by mechanical energy, passing the aqueous solution through a screen to obtain a permeate and retained fraction on the screen, and analyzing at least one parameter from the permeate for example by a gravimetric analysis, an optical analysis, an electrochemical analysis, a volumetric analysis, or combination thereof. Advantages include adjustability, speed, and high correlation with actual flushability or repulpability of the fibrous product, and utility in a process for manufacturing a fibrous sheet exhibiting controlled disintegration, such as a flushable or repulpable fibrous sheet.
    Type: Application
    Filed: June 28, 2018
    Publication date: April 16, 2020
    Applicant: Kemira Oyj
    Inventors: Clayton Campbell, Jennifer RISER, Kristin WITTICH, Frank ZIMMERMANN
  • Method for reducing colour of a biotechnological liquid
    Patent number: 10604546
    Abstract: The invention relates to a method for reducing colour of a biotechnological liquid. In the method a biotechnological liquid comprising colour forming substances is obtained and a high-basicity aluminium compound, which has a basicity of at least 0%, is added and mixed to the biotechnological liquid. Precipitate and/or flocks comprising colour forming substances are allowed to form, and the precipitate and/or flocks are separated from the biotechnological liquid.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: March 31, 2020
    Assignee: Kemira Oyj
    Inventors: Susanna Holappa, Michael Recktenwald
  • Barrier coating composition, sheet-like product and its use
    Publication number: 20200095732
    Abstract: A barrier coating composition is disclosed including 30-70 weight-% of a styrene (meth)acrylate copolymer, polymerised in the presence of a stabiliser, and the styrene (meth)acrylate copolymer having a glass transition temperature Tg?20° C., preferably ?10° C., 30-70 weight-% of a polyvinyl alcohol, and at most 5.0 weight-% of a cross-linker, reacting with —OH or —COOH groups. Further disclosed is a sheet-like product coated with the coating composition.
    Type: Application
    Filed: June 14, 2018
    Publication date: March 26, 2020
    Applicant: Kemira Oyj
    Inventors: Helena PEURANEN, Sami PUTTONEN, Tarja TURKKI, Mari OJANEN, Erland HERMANSSON
  • Method for manufacturing a fibrous web
    Publication number: 20200095730
    Abstract: A method includes forming an aqueous fibre suspension including cellulosic fibres from one or more raw material flows, and applying at least one chemical and/or physical control measure to the aqueous fibre suspension or at least one of its raw material flows for control of microbial activity in the aqueous fibre suspension or the raw material flow before an inlet of an intermediate residence entity. In this manner a starting ORP value for the aqueous fibre suspension is obtained. The aqueous fibre suspension is in the intermediate residence entity at least a minimum delay time. A final ORP value is measured for the aqueous fibre suspension after an outlet of the said intermediate residence entity before the formation of the fibrous web. An ORP difference value between the starting ORP and final ORP values is calculated. Finally, the aqueous fibre suspension is formed into a fibrous web and dried.
    Type: Application
    Filed: June 19, 2018
    Publication date: March 26, 2020
    Applicant: Kemira Oyj
    Inventors: Jaakko Ekman, Marko Kolari, Juhana Ahola
  • Moderately oxidized polysaccharide depressants for use in iron ore flotation processes
    Patent number: 10589293
    Abstract: Depressants comprising a moderately oxidized polysaccharide having about 0.05 to about 4.5 mmol of anionic charge per gram at a pH of about 6 to about 7, or about 0.2 to about 5 mmol of anionic charge per gram at a pH of about 10 to about 11.2, are provided. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral and gangue, wherein the process comprises carrying out a flotation process in the presence of one or more of the depressants.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: March 17, 2020
    Assignee: Kemira OYJ
    Inventor: Duane C. Wilson
  • Method for producing interpenetrating polymer network material, a product thereof and use of the product
    Patent number: 10590607
    Abstract: The present invention relates to an interpenetrating polymer network (IPN) material comprising microcrystalline cellulose (MCC), microfib-rillated cellulose (MFC) or a mixture thereof, and at least one polymer forming an IPN together with the MCC, MFC or mixture thereof. The present invention further relates to a process for producing the IPN material, and to use of the IPN material in paper industry.
    Type: Grant
    Filed: December 3, 2015
    Date of Patent: March 17, 2020
    Assignee: Kemira Oyj
    Inventors: Rosa Carceller, Tom Lundin, Matti Hietaniemi
  • Polymer product in particle form and its use
    Patent number: 10590604
    Abstract: The invention relates to a water-soluble polymer product in particle form, comprising amphoteric polyacrylamide, which is obtained by gel polymerisation of acrylamide together with anionic and cationic monomers. The amphoteric polyacrylamide has a mass average molecular weight MW of 1 500 000-6 000 000 g/mol, and a total ionicity of 4-15 mol-%, whereby the polymer product has a polymer content of at least 60 weight-%. The invention relates also to uses of the polymer product in paper and board making.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: March 17, 2020
    Assignee: Kemira Oyj
    Inventors: Asko Karppi, Matti Hietaniemi, Anneli Lepo, Kimmo Strengell
  • METHOD FOR INCREASING THE STRENGTH PROPERTIES OF A PAPER OR BOARD PRODUCT
    Publication number: 20200080264
    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: Application
    Filed: June 13, 2018
    Publication date: March 12, 2020
    Applicant: Kemira Oyj
    Inventors: Mikko VIRTANEN, Kimmo STRENGELL, Juan CECCHINI, Matti HIETANIEMI
  • GLYOXYLATED POLYACRYLAMIDE POLYMER COMPOSITION, ITS USE AND METHOD FOR INCREASING THE STRENGTH PROPERTIES OF PAPER, BOARD OR THE LIKE
    Publication number: 20200079950
    Abstract: A cationic glyoxylated polyacrylamide polymer composition having improved storage stability for use in manufacture of paper, board or the like, which aqueous composition includes a glyoxylated polyacrylamide polymer having a cationic charge density in a range of 0.8-1.8 meq/g of dry polymer in dry content of 5-15% and a buffering acid. The aqueous composition has pH in a range of 2.2-4.0 and a viscosity of less than 80 mPas measured at 25° C. by using a Brookfield viscometer after 30 days storage at 35° C. or after 60 days storage at 23° C.
    Type: Application
    Filed: July 5, 2017
    Publication date: March 12, 2020
    Applicant: Kemira Oyj
    Inventors: Asko KARPPI, Matti HIETANIEMI, Martina HALINEN, Salla Timperi, Vladimir GRIGORIEV, Mikko VIRTANEN
  • Method for producing a material with a network of at least two polymers, a product thereof and use of the product
    Patent number: 10584217
    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: Grant
    Filed: May 11, 2016
    Date of Patent: March 10, 2020
    Assignee: Kemira Oyj
    Inventors: Rosa Carceller, Matti Hietaniemi, Sacha Legrand, Mari Zabihian
  • METHOD FOR DEWATERING OF SLUDGE FROM A PULP, PAPER OR BOARD MAKING PROCESS
    Publication number: 20200063340
    Abstract: A method is disclosed for dewatering of sludge from a pulp, paper or board making process, such as deinking sludge, including obtaining of an aqueous sludge including an aqueous phase and a fibre material suspended in the aqueous phase. The sludge is subjected to a pre-thickening step, where a first part of the aqueous phase is removed from the sludge and to a pressing step, where a second part of the aqueous phase is removed from the sludge, thereby obtaining a dry pressed sludge. Before or at the pre-thickening step a polymer composition having a charge density of at the most 1.7 meq/g, preferably at most 1.5 meq/g, more preferably at most 1.1 meq/g, is added to the sludge.
    Type: Application
    Filed: December 15, 2017
    Publication date: February 27, 2020
    Applicant: Kemira Oyj
    Inventors: Matti Hietaniemi, Rosa Carceller, Asko Karppi, Joonas Likander, Jyri Välimäki
  • Composition for modifying rheology of coating colour, its use and a coating colour
    Publication number: 20200062967
    Abstract: The invention relates to a composition for modifying rheology of coating colour and its use. The composition comprises an aqueous polymer dispersion, comprising a copolymer of monomer (a), which is at least one optionally substituted styrene, and monomer (b), which is at least one C1-C4-alkyl (meth)acrylate. The copolymer has a particle size D50<100 nm. Composition comprises also degraded starch having an average molecular weight Mn<1000 g/mol.
    Type: Application
    Filed: March 22, 2017
    Publication date: February 27, 2020
    Applicant: Kemira Oyj
    Inventors: Anneli LEPO, Helena PEURANEN
  • Phosphorus precipitation and membrane flux in membrane bioreactors
    Patent number: 10570036
    Abstract: The present invention relates to a composition for treatment of wastewaters in a membrane bioreactor comprising a mixture of inorganic coagulants and organic water soluble polymer(s), wherein the inorganic coagulants are selected from iron and/or aluminium containing compounds and the organic water soluble polymers are selected from the group consisting of anionic, cationic, nonionic polymers, polysaccharides and polyphenolic compounds and any combination thereof. The present invention further relates to a method for treating of wastewaters in a membrane bioreactor, and uses thereof.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: February 25, 2020
    Assignee: KEMIRA OYJ
    Inventors: Mehrdad Hesampour, Fazlollah Azarnoush, Sakari Halttunen
  • Softener composition
    Patent number: 10570567
    Abstract: A softener composition for use in the manufacture of paper includes a softener and an acidic material, wherein the softener composition has a relative acidity (RA) value of more than 0.05.
    Type: Grant
    Filed: February 29, 2016
    Date of Patent: February 25, 2020
    Assignee: KEMIRA OYJ
    Inventors: Chen Lu, Clayton Campbell, Jenna Sue Rabideau
  • 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 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
  • 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
  • Composition for sizing paper
    Patent number: 10513828
    Abstract: A composition for sizing paper includes alkenylsuccinic anhydride (ASA) as the sizing agent and an emulsifier system of anionic emulsifiers and nonionic components, wherein the anionic emulsifiers are chosen from alkali metal salts of aliphatic carboxylic acids or aliphatic dicarboxylic acids and the nonionic components are chosen from polyethylene glycols.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: December 24, 2019
    Assignee: Kemira Chemie Ges.mbH
    Inventors: Leo Schmid, Jürgen Sartori
  • 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