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).

  • Publication number: 20240093433
    Abstract: The invention relates to a chemical treatment system for manufacture of paper, board or the like and to a method employing it. The system comprises a first component, which is a glyoxylated polyacrylamide having a net cationic charge density and obtained by glyoxylation of a cationic polyacrylamide base polymer having a weight average molecular weight MW in a range of 30 000-500 000 g/mol. The system further comprises a second component, which comprises a mixture of at least a high-amylopectin starch, and an anionic first polymer, which has a weight average molecular weight MW>200 000 g/mol. The second component has a net cationic charge density in a range from 0.05 meq/g to 0.9 meq/g, when measured at pH 2.8, and a net anionic charge density in a range from ?2 meq/g to ?0.1 meq/g, when measured at pH 7.
    Type: Application
    Filed: December 1, 2021
    Publication date: March 21, 2024
    Inventors: Matti HIETANIEMI, Asko KARPPI, Markus KORHONEN, Markus KVIST
  • Patent number: 11932707
    Abstract: The present invention relates to a method and an arrangement for dissolving starch. Specifically, the present invention relates to a method for dissolving starch by introducing mechanical force to at least partially gelatinized aqueous starch.
    Type: Grant
    Filed: February 6, 2020
    Date of Patent: March 19, 2024
    Assignee: Kemira Oyj
    Inventors: Asko Karppi, Perttu Heiska, Mika Suvanto, Matti Hietaniemi
  • Publication number: 20230159666
    Abstract: The present invention relates to a method and an arrangement for dissolving starch. Specifically, the present invention relates to a method for dissolving starch by introducing mechanical force to at least partially gelatinized agueous starch.
    Type: Application
    Filed: February 6, 2020
    Publication date: May 25, 2023
    Inventors: Asko KARPPI, Perttu HEISKA, Mika SUVANTO, Matti HIETANIEMI
  • Patent number: 11655593
    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: Grant
    Filed: July 10, 2019
    Date of Patent: May 23, 2023
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Asko Karppi, Jukka Rautiainen
  • Publication number: 20230140443
    Abstract: An aqueous prepolymer composition, which comprises a polyacrylamide base polymer comprising 10 - 40 mol-% of cationic monomers and having a weight average molecular weight Mw in the range of 120 000 - 350 000 g/mol, 0.1 - 1 weight-% of glyoxal, calculated from the total weight of the aqueous prepolymer composition, and a buffering acid for adjusting pH of the composition in the range of 2 - 4. A prepolymer composition is used in a method for producing on-site glyoxylated polyacrylamide useful in paper or board manufacturing.
    Type: Application
    Filed: March 17, 2021
    Publication date: May 4, 2023
    Inventors: Asko KARPPI, Salla TIMPERI, Matti HIETANIEMI
  • Publication number: 20230129116
    Abstract: Disclosed is method for on-site glyoxylation of polyacrylamide in a paper or board mill, where a discontinuous batch glyoxylation reaction of aqueous reaction mixture is performed in reactor vessel having driven agitator to form aqueous polymer composition comprising glyoxylated polyacrylamide. The method comprises forming or obtaining the aqueous reaction mixture comprising polyacrylamide base polymer and glyoxal, determining alkali consumption of the mixture, and adding to the mixture, based on determined alkali consumption, pre-determined amount of alkali for adjusting pH to 8-10. The temperature is optionally adjusted to 15-40° C. and the on-site glyoxylation reaction of polyacrylamide base polymer is allowed to proceed.
    Type: Application
    Filed: March 17, 2021
    Publication date: April 27, 2023
    Inventors: Asko KARPPI, Matti HIETANIEMI
  • Publication number: 20230122111
    Abstract: The invention relates to a composition and method for manufacture of paper, board, tissue or the like. The composition comprises an amphoteric polymer component, which has a weight average molecular weight of at least 600 000 g/mol, preferably at least 1 000 000 g/mol, more preferably at least 2 000 000 g/mol, and at least one synthetic cationic polymer component, which is a copolymer of a polyamidoamine and has a weight average molecular weight ?550 000 g/mol, preferably ?500 000 g/mol, more preferably ?400 000 g/mol and dispersity index more than 15, preferably more than 20, more preferably more than 25.
    Type: Application
    Filed: March 4, 2021
    Publication date: April 20, 2023
    Inventors: Kimmo Strengell, Asko KARPPI
  • Publication number: 20230024255
    Abstract: The invention relates to a composition for use in a manufacture of paper, board or the like. The composition comprises a mixture of cationic starch having amylopectin content of at least 85%, and an amphoteric polymeric structure comprising structural units originating from non-ionic monomers, preferably (meth)acrylamide, anionic groups and cationic groups, the polymeric structure comprising cationic groups at least 0.2 mol-%.
    Type: Application
    Filed: December 18, 2020
    Publication date: January 26, 2023
    Inventors: Matti HIETANIEMI, Asko KARPPI
  • Patent number: 11518695
    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: Grant
    Filed: May 15, 2018
    Date of Patent: December 6, 2022
    Assignee: Kemira Oyj
    Inventors: Asko Karppi, Matti Hietaniemi
  • Publication number: 20220306510
    Abstract: A polymeric structure, which is obtained by polymerisation of (meth) acrylamide and at least one charged monomer in a polymerisation medium comprising at least a first host polymer, which first host polymer comprises polyvinyl alcohol. The polymeric structure may be used in making of paper, board, tissue or the like as a strength agent, or in dewatering of sludge.
    Type: Application
    Filed: June 24, 2019
    Publication date: September 29, 2022
    Inventors: Joonas LIKANDER, Rosa CARCELLER, Suhua WU, Asko KARPPI, Markus KORHONEN, Matti HIETANIEMI
  • 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