Patents Examined by Peter Chin
  • Patent number: 8062476
    Abstract: A preparation of high strength paper by incorporating a polymeric film into the paper web during the paper making process is provided. The polymeric film is either a cold water soluble film or hot water soluble film or water insoluble hydrophilic film or non soluble non hydrophilic film or a combination of cold+hot+cold water soluble film or cold+hot water soluble film or cold+non soluble hydrophilic film or cold+non soluble hydrophilic film+cold water soluble film or cold+non soluble non hydrophilic film or cold+non soluble non hydrophilic film+cold water soluble film or slit strips of one or many of these combinations woven or intertwined offline and incorporated into the paper during the paper making process. Zone coating or discreet printing or zone extrusion striping or formation of hot water soluble film on preformed cold water soluble film which is then inserted into paper during the paper making process, thus using cold water soluble film as a carrier is also provided.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: November 22, 2011
    Assignee: Arrow Coated Products Ltd.
    Inventors: Shilpan Pravinchandra Patel, Nikita Kamlesh Thanawala
  • Patent number: 8057639
    Abstract: A system has been developed for pretreating cellulosic biomass feed stock including: a first pressurized reactor receiving the feed stock, wherein the feed stock undergoes hydrolysis in the first pressurized reactor; a sealing device having a first pressurized coupling to a feedstock discharge port of the first pressurized reactor, and a second pressurized coupling to a second pressurized reactor; a drain for a liquid including dissolved hemi-cellulosic material extracted from the feed stock in at least one of the first pressurized reactor and the sealing and extraction device; the second pressurized reactor assembly receiving the pressurized feed stock from the sealing device at a pressure substantially greater than the pressure in the first pressurized reactor, wherein cells of the feed stock are infused with water in the second pressurized reactor, and an expansion device downstream of the second pressurized reactor assembly, wherein the expansion device rapidly releases the pressure of the feed stock disc
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: November 15, 2011
    Assignee: Andritz Inc.
    Inventors: Thomas Pschorn, Namshee Shin, Bertil Stromberg
  • Patent number: 8052840
    Abstract: Compositions and methods for the removal of resin from wood chips processed in a Kraft pulping process are disclosed. The method is particularly useful for removing triterpene and triterpenoid resin.
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: November 8, 2011
    Assignee: Hercules Incorporated
    Inventor: Davit E. Sharoyan
  • Patent number: 8048266
    Abstract: A method of manufacturing a multilayer fibrous product. The product comprises at least two overlapping layers, each of which has a different fiber composition, and in the production of the product, chemical short stock is used at least partly. In the method, short stock is brought to a screening stage where fines, which pass a screen having an average hole size of 0.2-1.5 mm, are separated from it, in order to prepare at least two fiber fractions having different fiber compositions, and the fractions generated are recovered and included in different layers of the same fibrous product. With the invention, it is possible to screen an initial material and form a product which has better properties than a corresponding product, the initial material pulp of which has only been refined.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: November 1, 2011
    Assignee: M-real Oyj
    Inventors: Seppo Katajamäki, Esa Hassinen, Tom Nickull
  • Patent number: 8048267
    Abstract: The present invention relates to a sizing or coating composition that, when applied to paper substrate, creates a substrate having improved waterfastness, surface strength, and surface strength as measured by resistance to abrasion. In addition, the present invention relates to paper substrates containing the composition, as well as methods of using and making the paper substrate and composition.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: November 1, 2011
    Assignee: International Paper Company
    Inventors: Michael F Koenig, Kapil M Singh
  • Patent number: 8043473
    Abstract: The object of the present invention is to provide a process for producing deinked pulp from recovered paper containing stickies while preventing excessive reduction in the size of stickies, lowering the COD of effluents, and producing deinked pulp with a smaller residual ink content. In the ink detachment stage of the process for producing deinked pulp from recovered paper containing stickies, an anhydride of crystalline layered silicate is added, preferably in an amount of 0.1-1.5 weight % of absolute-dry pulp, and a deinking treatment is performed at a pH of 7.0-9.9. In the present invention, the deinking treatment is performed in a weakly alkaline to neutral region which is generally said to be effective in reducing the amount of stickies but less effective in ink detachment and, yet, deinked pulp having a smaller amount of residual ink can be produced.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: October 25, 2011
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Chie Yuzawa, Hisashi Iwabuchi, Yasuyuki Kamijo, Shisei Goto, Takeshi Iimori
  • Patent number: 8038840
    Abstract: A process for refining and producing cellulose, lignin and xylose from biomass material comprises the following steps: pulverizing and screening the biomass material; and then dipping the biomass material in organic acid with lower boiling point and decomposing it into xylose, xylo-oligosaccharide, cellulose and lignin to make the biomass material fluidify; cooling the fluidified biomass material after finishing the reaction, adding organic solvent, and mixing uniformly and standing; separating, washing and drying the precipitation to obtain amorphous cellulose after precipitating; distilling the mother solution of precipitation of cellulose and recovering the organic acid and the resulting volatile organic substance; standing the distilled mother solution after cooling, and then separating, washing and drying the precipitation to obtain xylose and xylo-oligosaccharide after precipitating; distilling and recovering the organic solvent in the mother solution of precipitation of xylose and xylo-oligosaccharide,
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: October 18, 2011
    Inventor: Rongxiu Li
  • Patent number: 8029645
    Abstract: Soft and strong fibrous structures and more particularly soft and strong fibrous structures that contains less softwood fibers than known fibrous structures and methods for making such soft and strong fibrous structures are provided.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: October 4, 2011
    Assignee: The Procter & Gamble Company
    Inventor: Khosrow Parviz Mohammadi
  • Patent number: 8025768
    Abstract: A continuous fiIter treatment process in which anionic polymer dispersions (latex) are added to common papermaking filler slurries ai ambient temperature and then mixed with water of temperature higher than the glass transition temperature (Tg) of the latex used. To efficiently fix the latex the temperature of the filler/latex mixture must be 30-60° C. higher than ihe Tg of the latex used. The chemical composition of the resin and the type of surfactant used during the emulsion polymerization process of the polymer latex dispersions are important factors for efficiently fixing the latex onto the filler by adding hot water and improving the properties of paper made with the treated filler. Enhanced fixation of anionic latex onto filler using hot water is done in mixing vessels that can control shear and mixing time. The anionic latexes are totally and irreversibly fixed or bound onto the filler particles and the aggregated filler slurry is stable over time.
    Type: Grant
    Filed: June 5, 2008
    Date of Patent: September 27, 2011
    Assignee: Fpinnovations
    Inventors: Makhlouf Laleg, Roderick Collins, Danielle Gagne, Steven Middleton
  • Patent number: 8021516
    Abstract: A water-soluble interjacent complex that includes a first water-soluble polymer and one or more water-soluble monomers polymerized to form a second water-soluble polymer in the presence of the first water-soluble polymer. The water-soluble interjacent complex forms a solution in water that is free of insoluble polymer particles. The interjacent complexes may be used to treat a waste sludge by adding an effective amount thereof to the waste sludge. The interjacent complexes may also be used in making paper by adding an effective amount thereof to a pulp or a forming sheet at a suitable location on a paper making machine. The interjacent complexes may further be used as a rheology modifier in aqueous systems by adding an effective amount thereof to an aqueous medium to effect a desired viscosity, rheology, or flow curve property.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: September 20, 2011
    Assignee: WSP Chemicals & Technology, LLC
    Inventors: Shih-Ruey T Chen, Valentino L. DeVito, Kevin W. Frederick
  • Patent number: 8016979
    Abstract: A chemical solution-containing thin paper wherein a chemical solution is contained in an amount of 5 to 40% by weight with respect to base paper, powders are included in an amount of 0.1 to 30% by weight with respect to the chemical solution, the powders are formed by blending first powders each having an average particle size of 3 to 15 ?m and second powders each having an average particle size of 15 to 40 ?m with a weight ratio of the first powders with respect to the second powders of 0.1:1.9 to 1.9:0.1, and the chemical solution does not include an adhesive ingredient.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: September 13, 2011
    Assignee: Daio Paper Corporation
    Inventor: Atsushi Konuma
  • Patent number: 7998311
    Abstract: Size press compositions and methods for producing sized paper products, including liner board, are disclosed. The size press compositions contain at least one non-reactive cationic surface sizing agent, at least one reactive sizing agent, at least one promoter resin, at least one binder, and water. The at least one non-reactive cationic surface sizing agent may be a polymer in the form of a dispersion, an emulsion or a latex with a positive zeta potential below about pH 6. The at least one reactive sizing agent may be a dispersion, an emulsion or a latex including an alkyl ketene dimer or an alkyl succinic anhydride. The at least one promoter resin may be a polyaminoamide-epichlorohydrin resin or poly (dimethyldiallylammonium chloride).
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: August 16, 2011
    Assignee: Hercules Incorporated
    Inventor: Daniel F. Varnell
  • Patent number: 7988826
    Abstract: The invention improves a sizing effect even on paper containing no internal sizing agent and improves productivity by making solution polymerization in a small amount of an organic solvent. The invention provides a cationic surface sizing agent composed of a copolymer obtained by solution polymerization of (a) 15 to 35% by weight of a tertiary amino group-containing monomer, (b) 30 to 85% by weight of C1 to C4 alkyl(meth)acrylate, and (c) 1 to 50% by weight of styrenes in an organic solvent in the presence of a chain transfer agent. The copolymer may be subjected to cationization treatment with a quaternization agent. As a constituent monomer of the copolymer, 0 to 20% by weight of another copolymerizable vinyl monomer (d) may be contained. The cationic surface sizing agent is applied to paper.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: August 2, 2011
    Assignee: Harima Chemicals, Inc.
    Inventors: Kazushige Inaoka, Tomohiko Nakata, Yoshiharu Hashiguchi
  • Patent number: 7972479
    Abstract: The present invention relates to a process for the control of pitch in an aqueous medium by adding surface-reacted natural calcium carbonate or an aqueous suspension comprising surface-reacted calcium carbonate and having a pH greater than 6.0 measured at 20° C., to the medium, wherein the surface-reacted calcium carbonate is a reaction product of natural calcium carbonate with carbon dioxide and one or more acids, the use of the surface-reacted natural calcium carbonate for pitch control, as well as to a combination of a surface-reacted natural calcium carbonate and talc for pitch control, and the resulting composites.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: July 5, 2011
    Assignee: Omya Development AG
    Inventors: Patrick A. C. Gane, Joachim Schölkopf, Daniel Gantenbein
  • Patent number: 7959762
    Abstract: A method for making mixed polymer composite fibers in which a carboxyalkyl cellulose and a starch are blended in water to provide an aqueous gel; the aqueous gel treated with a first crosslinking agent to provide a crosslinked gel; the crosslinked gel mixed with a water-miscible solvent to provide fibers; and the fibers treated with a second crosslinking agent to provide crosslinked mixed polymer composite fibers.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: June 14, 2011
    Assignee: Weyerhaeuser NR Company
    Inventor: S Ananda Weerawarna
  • Patent number: 7947152
    Abstract: Doctor blade for the paper industry, comprising a scraping plate (1) and holding means (p) for the scraping plate which in turn are held by a frame (a) the ends of which are securely fastened (2) by two fastening points (pf) to a stationary structure (f), characterized in that it comprises: a) mechanical means for adjustable fastening (3) between at least one end (2) of the frame and the stationary structure (f) in such a way that the distance (d) between the two fastening points (pf) can be varied by the user; and b) means for incorporating an additional mass (5) in adjustable quantities.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: May 24, 2011
    Inventors: Jose Joaquin Amonarriz Azcolain, Jose Miguel Echeberria Giocoechea
  • Patent number: 7938933
    Abstract: Disclosed is a method for making fiber paper. In this method, mineral fibers and PVA resin are blended in water, thus forming first solution. Polymer fibers and PVA resin are blended in water, thus forming second solution. The first solution is mixed with the second solution. A wet paper-making machine is used to make mineral fiber paper from the mixture.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: May 10, 2011
    Assignee: Atomic Energy Council—Institute of Nuclear Energy Research
    Inventors: To-Mai Wang, Sheng-Fu Yang, Yung-Wou Lee, Kin-Seng Sun, Wen-Cheng Lee, Ching-Liang Chen, Chin-Ching Tzeng
  • Patent number: 7922867
    Abstract: Process for the production of paper, board and cardboard having high dry strength by separate addition of a polymer comprising vinylamine units and of ligninsulfonic acid and/or a ligninsulfonate to a paper stock, draining of the paper stock and drying of the paper products.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: April 12, 2011
    Assignee: BASF SE
    Inventors: Norbert Schall, Ellen Krueger, Martin Ruebenacker
  • Patent number: 7918965
    Abstract: Process for the production of paper, board and cardboard by draining a paper stock with sheet formation in the presence of a retention aid system comprising (i) at least one polymer comprising vinylamine units, in the form of the free bases, of the salts and/or in quaternized form, as the sole cationic polymer, (ii) at least one linear, anionic polymer having a molar mass Mw of at least 1 million and/or at least one branched, anionic, water-soluble polymer and/or bentonite and/or silica gel and (iii) at least one particulate, anionic, crosslinked, organic polymer having a mean particle diameter of at least 1 ?m and an intrinsic viscosity of less than 3 dl/g, and use of the retention aid system comprising the components (i), (ii) and (iii) as an additive in the production of paper, board and cardboard.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: April 5, 2011
    Assignee: BASF Aktiengesellschaft
    Inventors: Marc Leduc, Oliver Koch, Simon Champ, Rainer Blum, Andreas Merkel, Knut Menke
  • Patent number: 7897011
    Abstract: The invention relates to a high quality paperboard comprising at least two plies, a first ply having good surface properties and strength, and a second ply for providing the paperboard with bulk wherein the second ply comprises hardwood CTMP. This paperboard has an internal strength and a bending resistance that is comparable with conventional high quality paperboard based on softwood CTMP. The invention also relates to products manufactured of the paperboard.
    Type: Grant
    Filed: February 9, 2006
    Date of Patent: March 1, 2011
    Assignee: Stora Enso AB
    Inventors: Frank Peng, Isto Heiskanen, Mika Riikonen