Patents Assigned to Kemira
  • Method for treating starch in pulp, paper and board making processes
    Patent number: 10640923
    Abstract: The invention relates to a method for treating starch in pulp, paper and board making processes, in which processes recycled fibre material is used as raw material wherein the recycled fibre material is pulped in a pulper and obtaining a pulp flow comprising an aqueous phase and at least recycled fibres and starch dispersed in the aqueous phase. The method comprising the following steps: —adding amylase enzyme inhibitor and/or at least one biocide to pulp flow or to an aqueous process flow comprising starch for preventing starch degradation, and—adding an amphoteric polymer obtained by copolymerisation of (meth)acrylamide with cationic and anionic monomers to pulp flow or to an aqueous process flow comprising starch for binding starch to the fibres.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: May 5, 2020
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Jaakko Ekman, Asko Karppi, Marko Kolari
  • Recovery of phosphorus compounds from wastewater
    Patent number: 10633272
    Abstract: The present invention concerns a process for recovering phosphates from wastewater by adding to the wastewater at least one organic coagulant or polymer in a mechanical treatment step that leaves dissolved phosphorus in the water phase, separating a mechanical sludge from the treated wastewater, preferably by sedimentation, flotation or filtration, carrying the phosphorus-containing treated wastewater in a post-treatment step, where at least one chemical precipitant is added to precipitate the dissolved phosphate into solid phosphates, and separating the solid phosphates from the treated wastewater to recover the phosphates.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: April 28, 2020
    Assignee: KEMIRA OYJ
    Inventors: Outi Grönfors, Hanna-Mari Kangaslahti, Bengt Hansen, Sakari Halttunen, Fazlollah Azarnoush
  • Prevention of starch degradation in pulp, paper or board making processes
    Patent number: 10626559
    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: July 19, 2018
    Date of Patent: April 21, 2020
    Assignee: Kemira OYJ
    Inventors: Marko Kolari, Jaakko Ekman, Satu Ikävalko
  • Composition, its use and method for removing and preventing wet strength resins from contaminating papermaking equipment
    Patent number: 10626355
    Abstract: Compositions and methods for cleaning wet strength resin contamination from papermaking equipment and/or for preventing wet strength resins from contaminating papermaking equipment using the compositions are disclosed. The compositions comprise an aqueous solution of a weak organic acid; a surfactant, preferably a nonionic surfactant, a divalent metal ion containing catalyst and optionally a glycol ether containing solvent.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: April 21, 2020
    Assignee: Kemira Oyj
    Inventors: Yong Zou, Yuping Luo, Anna Casasús
  • Absorbent materials, products including absorbent materials, compositions, and methods of making absorbent materials
    Patent number: 10624986
    Abstract: In various exemplary embodiments described herein, an absorbent structure (e.g., a paper material) having an applied absorbent material (e.g., an absorbent film) may be formed by treating a fiber (e.g., a cellulosic fiber) with an applied absorbent material forming system (also referred to as a “film forming system”), absorbent materials, compositions, methods of making absorbent materials, and the like.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: April 21, 2020
    Assignee: KEMIRA OYJ
    Inventors: Chen Lu, Vladimir Grigoriev, Scott Rosencrance, Henry Skoog
  • 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
  • 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
  • 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
  • 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
  • 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 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
  • 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
  • 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
  • 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
  • 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