Patents by Inventor Jonni Ahlgren
Jonni Ahlgren 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).
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Publication number: 20240052573Abstract: The present disclosure generally relates to aqueous cationic polyacrylamide (CPAM) dispersions, methods of preparation and methods of use thereof, particularly in the paper industry. For example, these CPAM dispersions may be used in any of the following: (i) sticky control in paper manufacturing (ii) fixing in paper manufacturing, (ii) sludge dewatering, and/or (iii) oil-water separation. Moreover, the present disclosure generally pertains to CPAM dispersions, wherein such CPAM dispersions are aqueous dispersions which are shelf stable at room temperature, methods of preparation and methods of use thereof in papermaking applications and in products such as paper-based products. The disclosed CPAM dispersions may be used as retention aids in papermaking processes, may increase retention of starch to a formed paper web and/or board web, and may provide increased dry strength to paper-based products.Type: ApplicationFiled: October 29, 2021Publication date: February 15, 2024Inventors: Marko LAAKKONEN, Claudio CARLETTI, Jonni AHLGREN, Valtteri VILJANEN, Edin GOLETIC
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Publication number: 20230014619Abstract: The invention relates to a method for producing cationized cellulose. The method comprises at least preparing a slurry of a cellulosic starting material in an alkaline liquid medium which comprises an organic liquid and performing mercerization of the slurry. The concentration of the cellulosic starting material in the slurry is at least 20 weight-%, calculated as dry from total weight of the liquid medium and the cellulosic starting material. A cationizing agent is added to the slurry after the mercerization step at a cationization temperature, which is less than the boiling point of the alkaline liquid medium, and the cellulose in the slurry is allowed to react with the cationizing agent, preferably under inert atmosphere and a cationized cellulose product is obtained.Type: ApplicationFiled: December 4, 2020Publication date: January 19, 2023Inventors: Veli-Matti VUORENPALO, Jonni AHLGREN, Jaakko HILTUNEN, Anna-Maija PERANDER, Chunlin XU, Sanna LEHTO, Eija AHONEN, Tarja IKÄVALKO
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Publication number: 20220298035Abstract: A treatment system for removing dissolved organic compounds from wastewater, which comprises a water-soluble cationic polymer, and wood-based organic material having an average particle size <10 mm. The invention relates also use of said treatment system for COD removal in the treatment of wastewaters, and a method for removing dissolved organic compounds from wastewater.Type: ApplicationFiled: June 12, 2020Publication date: September 22, 2022Inventors: Sakari HALTTUNEN, Matias PENTTINEN, Jonni AHLGREN, Susann HÄRKÖNEN, Marina SHESTAKOVA
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Patent number: 11118079Abstract: A water-based barrier coating composition suitable for use as a barrier coating is disclosed which includes an aqueous polymer composition obtainable by free radical (co)polymerizing an ethylenically unsaturated monomer blend having an optionally substituted styrene, at least one C1-C4-alkyl (meth)acrylate, other ethylenically unsaturated copolymerizable monomers, degraded starch polyvinyl alcohol (PVA), a plasticizer; a composition having C16-C18 alkenyl ketene dimer, optionally as a mixture with rosin, of a gelling agent; and optionally a filler.Type: GrantFiled: December 28, 2016Date of Patent: September 14, 2021Assignee: KEMIRA OYJInventors: Tarja Turkki, Sai Li, Jonni Ahlgren
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Patent number: 10662092Abstract: A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises —obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and —adding a high cationic starch having a charge density value of at least 1.8 meq/g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.Type: GrantFiled: August 31, 2016Date of Patent: May 26, 2020Assignee: Kemira OyjInventors: Jonni Ahlgren, Sakari Halttunen, Jussi Ruotsalainen, Maria Luhtala, Miia Niemelä
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Publication number: 20180355204Abstract: A water-based barrier coating composition suitable for use as a barrier coating is disclosed which includes an aqueous polymer composition obtainable by free radical (co)polymerizing an ethylenically unsaturated monomer blend having an optionally substituted styrene, at least one C1-C4-alkyl (meth)acrylate, other ethylenically unsaturated copolymerizable monomers, degraded starch polyvinyl alcohol (PVA), a plasticizer; a composition having C16-C18 alkenyl ketene dimer, optionally as a mixture with rosin, of a gelling agent; and optionally a filler.Type: ApplicationFiled: December 28, 2016Publication date: December 13, 2018Applicant: KEMIRA OYJInventors: Tarja Turkki, Sai Li, Jonni Ahlgren
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Publication number: 20180319682Abstract: The invention relates to a method for optimising material recovery in a chemical pulping process. The method comprises treating of cellulosic raw material with cooking chemicals in a cooking step, where lignin is at least partly dissolved into cooking liquid phase and separated from fibres. The lignin is separated from the cooking liquid phase. The separated lignin is used for formation of a treatment composition comprising at the most 1 weight-% of aluminium. A bleaching liquid phase is treated with the treatment composition in order to remove organic humic substances from the bleaching liquid. Organic sludge is formed and it is used for energy production in a chemical recovery step.Type: ApplicationFiled: November 4, 2016Publication date: November 8, 2018Applicant: Kemira OyjInventors: Jonni Ahlgren, Sakari Halttunen, Jussi Ruotsalainen, Kari Saari
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Publication number: 20180244549Abstract: A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises—obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and—adding a high cationic starch having a charge density value of at least 1.8 meq/g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.Type: ApplicationFiled: August 31, 2016Publication date: August 30, 2018Applicant: Kemira OyjInventors: Jonni Ahlgren, Sakari Halttunen, Jussi Ruotsalainen, Maria Luhtala, Miia Niemelä
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Patent number: 9410289Abstract: The invention relates to a coating color composition for paper and/or paperboard comprising a pigment, optionally known additives used in coating compositions, and a binder substitute comprising styrene acrylate copolymer having mean particle size ?100 nm. The invention also relates to paper or paperboard coated with a coating color composition according to the invention.Type: GrantFiled: June 29, 2009Date of Patent: August 9, 2016Assignee: KEMIRA OYJInventors: Jonni Ahlgren, Antti Matula, Tarja Turkki
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Patent number: 9080288Abstract: The invention relates to a method for producing paper, board or the like. In the method is obtained an aqueous filler dispersion, comprising particles of at least one first filler, the filler dispersion having a floc size distribution with original mean chord length value. The particles of the first mineral filler are brought into a contact with a cationic pre-treatment agent, which is capable of initiating flocculation of the filler particles in the dispersion, whereby a pre-treated filler dispersion comprising flocs, which comprise first mineral particles, is formed. The pre-treated filler dispersion is combined with a stock of fibers. The floc size distribution of the filler dispersion is changed with the pre-treatment agent, which is a natural and/or synthetic polymer, so that the mean chord length value increases at least with 2% from the original mean chord length value.Type: GrantFiled: January 16, 2013Date of Patent: July 14, 2015Assignee: KEMIRA OYJInventors: Matti Hietaniemi, Mikko Virtanen, Jonni Ahlgren
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Publication number: 20140360691Abstract: The invention relates to a method for producing paper, board or the like. In the method is obtained an aqueous filler dispersion, comprising particles of at least one first filler, the filler dispersion having a floc size distribution with original mean chord length value. The particles of the first mineral filler are brought into a contact with a cationic pre-treatment agent, which is capable of initiating flocculation of the filler particles in the dispersion, whereby a pre-treated filler dispersion comprising flocs, which comprise first mineral particles, is formed. The pre-treated filler dispersion is combined ed with a stock of fibres. The floc size distribution of the filler dispersion is changed with the pre-treatment agent, which is a natural and/or synthetic polymer, so that the mean chord length value increases at least with 2% from the original mean chord length value.Type: ApplicationFiled: January 16, 2013Publication date: December 11, 2014Applicant: KEMIRA OYJInventors: Matti Hietaniemi, Mikko Virtanen, Jonni Ahlgren
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Patent number: 8052841Abstract: The invention relates to a process for manufacturing paper, in which a filler is pretreated and suspended to form an aqueous slurry, the aqueous slurry obtained is combined with an aqueous suspension containing cellulose fibers to form a stock, the stock obtained is treated at least with a cationic retention agent and the treated stock is filtered to form paper. Retention and optical properties are improved by the filler being pre-treated with inorganic colloidal particles having an average size less than 100 nm.Type: GrantFiled: April 14, 2004Date of Patent: November 8, 2011Assignee: Kemira OyjInventors: Jonni Ahlgren, Kimmo Strengell
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Patent number: 8048264Abstract: The present invention relates to a stabilizing composition comprising following components (A) a polymer having following formula wherein R1 is a hydrogen atom or an alkyl group containing 1 to 12 carbon atoms, R2 is —COOM or —CH2COOM, M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol, (B) a chelating agent, and (C) an alkaline earth metal compound. The invention also relates to a process for the treatment of a fiber material.Type: GrantFiled: May 10, 2005Date of Patent: November 1, 2011Assignee: Kemira OyjInventors: Aarto Parén, Jonni Ahlgren, Jukka Jäkärä, Ilkka Renvall, Jukka Rautiainen
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Publication number: 20110236572Abstract: A dry coating binder includes a polymer which includes at least 80% by weight of main monomers. The main monomers are selected from C1-C20-alkyl (meth)acrylates, C1-C20-hydroxy alkyl (meth)acrylates, vinyl esters of carboxylic acids including up to 20 carbon atoms, vinyl aromatics having up to 20 carbon atoms, ethylenically unsaturated nitriles, vinyl ethers of alcohols including 1 to 10 carbon atoms, aliphatic hydrocarbons having 2 to 8 carbon atoms and one or two double bonds or mixtures of these monomers, and that the particle size of the binder is between 200-400 nm. Further, the use of the dry coating binder, and a dry coating composition are also described.Type: ApplicationFiled: November 23, 2009Publication date: September 29, 2011Applicant: KEMIRA OYJInventors: Jonni Ahlgren, Nina Bruun, Vesa Nuutinen
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Patent number: 7988821Abstract: The invention relates to a process for the treatment of a fibre material comprising the step of contacting the fibre material in an aqueous medium with a chelating agent and a polymer having following general formula wherein R1 is a hydrogen atom or an alkyl group containing 1 to 12 carbon atoms, R2 is —COOM or —CH2COOM, M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol. The invention also relates to a composition comprising a chelating agent and the above polymer.Type: GrantFiled: June 13, 2007Date of Patent: August 2, 2011Assignee: Kemira OyjInventors: Seung-Hoon Lee, Jonni Ahlgren, Jukka Jäkärä, Aarto Parén, Jukka Rautiainen, Ilkka Renvall
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Publication number: 20110132560Abstract: A gypsum-fibre composite product, wherein the gypsum appears as crystals on the surface of the fibre and wherein the gypsum crystals are obtained by contacting calcium sulphate hemihydrate and/or calcium anhydrite and an aqueous fibre suspension. Also disclosed is a process for the preparation of the gypsum-fibre composite product. The composite product can be used as a filler pigment or coating pigment in the production of paper.Type: ApplicationFiled: April 20, 2009Publication date: June 9, 2011Inventors: Tarja Turkki, Jonni Ahlgren
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Publication number: 20110011546Abstract: The invention relates to a method for controlling deposit formation on paper machine rolls, said method comprising applying at the dry end of a paper machine an aqueous solution of an anionic or non-ionic polymer on the surface of the paper for preventing the rolls from being contaminated by stickies and/or other depositable material from the paper.Type: ApplicationFiled: September 30, 2008Publication date: January 20, 2011Inventors: Juha Rintala, Lars-Ola Berts, Reetta Strengell, Thorbjorn Ahlskog, Jonni Ahlgren
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Patent number: 7867357Abstract: The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fiber material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a polylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 5. The invention also relates to peroxide bleaching processes.Type: GrantFiled: January 4, 2010Date of Patent: January 11, 2011Assignee: Kemira OyjInventors: Jonni Ahlgren, Aarto Parén, Jukka Jäkärä, Timo Härmä, Ilkka Renvall
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Publication number: 20100216934Abstract: Method of grafting an anionic organic polymer to an organic polymer in latex form, which method comprises forming a water-based mixture of (1) a latex of an organic polymer, (2) an anionic organic polymer, and (3) a free radical initiator, and effecting grafting between said latex polymer and said anionic organic polymer characterized in that the anionic organic polymer is (i) an anionic homopolymer or anionic random copolymer wherein at least 50 mole % of the repeating units are repeating units that bear at least one acid group or acid salt group or (ii) a graft or block copolymer comprising a segment consisting of a anionic homopolymer or anionic random copolymer as defined in (i), and aqueous dispersion comprising graft polymer particles.Type: ApplicationFiled: March 31, 2008Publication date: August 26, 2010Applicant: KEMIRA OYJInventors: Teppo Sahlberg, Jan-Luiken Hemmes, Jonni Ahlgren, Uwe Schulze, Claudia Eigen
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Patent number: 7754048Abstract: The present invention relates to a process for bleaching a cellulosic fibre material with a peroxide compound in an aqueous alkaline medium, comprising a bleaching step wherein: a) a first polymer (A) comprising a homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, and a solution of a second polymer (B) comprising a poly-alpha-hydroxyacrylic acid or a salt thereof, are added to a cellulosic fibre material, and b) thereafter adding a peroxide compound and an alkaline substance and carrying out the bleaching.Type: GrantFiled: January 9, 2004Date of Patent: July 13, 2010Assignee: Kemira OyjInventors: Aarto Paren, Jukka Jäkärä, Ilkka Renvall, Jonni Ahlgren, Riitta Laitinen, Jussi Nikkarinen, Tapio Viitanen