Patents by Inventor Asko Karppi

Asko Karppi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11447618
    Abstract: The invention relates to a water-soluble polymer composition obtained by polymerizing in an aqueous polymerisation medium, which comprises degraded starch, at least following monomers: acrylamide and/or methacrylamide, and >2 mol-% of at least one unsaturated mono- or dicarboxylic acid(s) or salts thereof. The polymer composition has an anionic net charge at pH 7 and a dry solids content of >5 weight-%. The invention relates also to the use of the polymer composition for surface sizing of paper, board or the like as well as to a surface size composition comprising it.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: September 20, 2022
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Asko Karppi, Rosa Carceller
  • Patent number: 11441273
    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: Grant
    Filed: November 22, 2017
    Date of Patent: September 13, 2022
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Asko Karppi, Maarit Latvanen, Elsa Olmos
  • Patent number: 11427965
    Abstract: A dry strength composition for manufacture of paper, board or the like is disclosed. The dry strength composition includes, as a mixture, at least one anionically derivatized polysaccharide, and cationic starch having an amylopectin content ?80 weight-%. The anionically derivatized polysaccharide and the cationic starch provide the composition with a charge density in a range of 0.1-1.5 meq/g, when measured at pH 2.8, and ?0.1-?3 meq/g, preferably ?0.3-?2.5 meq/g, more preferably ?0.5-?2.0 meq/g, when measured as an aqueous solution, at pH 7.0. Further disclosed are a use of the composition and a method for manufacturing paper, board or the like.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: August 30, 2022
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Asko Karppi, Jonas Konn
  • Patent number: 11339539
    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: Grant
    Filed: October 31, 2018
    Date of Patent: May 24, 2022
    Assignee: Kemira Oyj
    Inventors: Timo Valkealaakso, Simo-Pekka Vanninen, Asko Karppi
  • Publication number: 20220089842
    Abstract: The present invention relates to an aqueous composition of dissolved starch, use of it and compositions comprising the same. The composition has good handling properties and viscosity stability also in elevated starch concentrations.
    Type: Application
    Filed: February 6, 2020
    Publication date: March 24, 2022
    Inventor: Asko KARPPI
  • 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
  • Publication number: 20210262169
    Abstract: A method for manufacturing a multi-layered fibrous web is disclosed, which includes at least two fibrous layers, where each layer is formed from one or more fibre stocks. The fibrous layers are combined prior to subjecting the multilayered fibrous web to wet-pressing and drying. At least one layer of the multi-layered fibrous web is formed from a fibre stock including at least 50 weight-% of a chemi-thermomechanical pulp (CTMP), a hardwood kraft pulp and/or a recycled fibre material calculated from a thick stock applied to a particular layer approach system. A first strength component and a second strength component are added to the fibre stock. The first strength component includes a cationic strength agent and the second strength component includes a synthetic amphoteric polymer composition having a net charge from ?3 to +1 meq/g (dry), at a pH of 7.
    Type: Application
    Filed: July 10, 2019
    Publication date: August 26, 2021
    Applicant: Kemira Oyj
    Inventors: Matti HIETANIEMI, Asko KARPPI, Jukka RAUTIAINEN
  • Patent number: 11066546
    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: Grant
    Filed: July 5, 2017
    Date of Patent: July 20, 2021
    Assignee: Kemira Oyj
    Inventors: Asko Karppi, Matti Hietaniemi, Martina Halinen, Salla Timperi, Vladimir Grigoriev, Mikko Virtanen
  • Publication number: 20210189101
    Abstract: The invention relates to a water-soluble polymer composition obtained by polymerizing in an aqueous polymerisation medium, which comprises degraded starch, at least following monomers: acrylamide and/or methacrylamide, and >2 mol-% of at least one unsaturated mono- or dicarboxylic acid(s) or salts thereof. The polymer composition has an anionic net charge at pH 7 and a dry solids content of >5 weight-%. The invention relates also to the use of the polymer composition for surface sizing of paper, board or the like as well as to a surface size composition comprising it.
    Type: Application
    Filed: February 28, 2017
    Publication date: June 24, 2021
    Applicant: Kemira Oyj
    Inventors: Matti Hietaniemi, Asko Karppi, Rosa Carceller
  • Publication number: 20210102343
    Abstract: A dry strength composition for manufacture of paper, board or the like is disclosed. The dry strength composition includes, as a mixture, at least one anionically derivatized polysaccharide, and cationic starch having an amylopectin content ?80 weight-%. The anionically derivatized polysaccharide and the cationic starch provide the composition with a charge density in a range of 0.1-1.5 meq/g, when measured at pH 2.8, and ?0.1-?3 meq/g, preferably ?0.3-?2.5 meq/g, more preferably ?0.5-?2.0 meq/g, when measured as an aqueous solution, at pH 7.0. Further disclosed are a use of the composition and a method for manufacturing paper, board or the like.
    Type: Application
    Filed: January 18, 2019
    Publication date: April 8, 2021
    Applicant: Kemira Oyj
    Inventors: Matti Hietaniemi, Asko Karppi, Jonas Konn
  • Patent number: 10858782
    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: Grant
    Filed: December 15, 2017
    Date of Patent: December 8, 2020
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Rosa Carceller, Asko Karppi, Joonas Likander, Jyri Välimäki
  • Publication number: 20200377673
    Abstract: A method for producing an aqueous copolymer solution, which comprises dissolving a copolymer of (meth)acrylamide and at least 1 mol-% cationic monomers, calculated from total amount of monomers in the dissolving water having calcium hardness of at least mg/l, expressed as Ca2+, and adding acid comprising monoprotic organic acid and/or mineral acid to the dissolving water and/or the aqueous solution of the copolymer in an amount sufficient to provide the aqueous solution of the copolymer with a pH of equal to or less than 4.5. The invention also relates to uses of the obtained polymer solutions in manufacturing of paper, board or the like or in treatment of sludge or water.
    Type: Application
    Filed: May 15, 2018
    Publication date: December 3, 2020
    Applicant: Kemira Oyj
    Inventors: Asko Karppi, Matti Hietaniemi
  • Patent number: 10800869
    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: Grant
    Filed: December 15, 2017
    Date of Patent: October 13, 2020
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Rosa Carceller, Asko Karppi, Joonas Likander
  • Patent number: 10787768
    Abstract: A method for manufacture of paper, board or the like, comprising the step of dissolving a composition into aqueous solution, whereby an aqueous treatment solution is obtained for adding the obtained treatment solution to the pulp. The composition comprising a copolymer of acrylamide and at least one cationic monomer, the copolymer comprising cationic monomers at least 15 mol-%, calculated from total amount of monomers, and an ionic crosslinker agent comprising at least two carboxyl groups, wherein the equivalent ratio of carboxyl groups:cationic monomer is between 1:20 and 1:0.5.
    Type: Grant
    Filed: September 4, 2017
    Date of Patent: September 29, 2020
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Jaakko Ekman, Asko Karppi, Kimmo Strengell
  • Patent number: 10781556
    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: Grant
    Filed: September 26, 2017
    Date of Patent: September 22, 2020
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Asko Karppi, Mikko Virtanen
  • 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
  • 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
  • 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
  • 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
  • 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