Cellulosic Patents (Class 162/157.6)
  • Patent number: 10570563
    Abstract: In some embodiments, the present invention provides methods including the steps of providing cellulosic material, associating the cellulosic material with an organic acid (e.g., lactic acid) to form a mixture, and heating the mixture to a temperature between 100° C. and 120° C. for at least ten minutes to form a treated cellulosic material, wherein the water retention value of the treated cellulosic material is decreased by at least 10% as compared to untreated cellulosic material.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: February 25, 2020
    Assignee: University of Maine System Board of Trustees
    Inventors: Michael A. Bilodeau, Jonathan Spender
  • Patent number: 10458067
    Abstract: The present application relates to a cross-linked fiber and more specifically to fibers that have been subjected to cold caustic extraction (at less than 60° C.) to reduce the hemicellulose content of the fibers by at least 50% and then cross-linked with a cross-linking agent that is curable at a modest temperature, such as less than 160° C. The treated cross-linked fibers preferably have a hemicellulose content that is less than 5% by weight of the fiber. Preferable cross-linking agents are polyamide-epichlorohydrin (PAE) resins, polyamide-polyamine-epichlorohydrin (PPE) resins, and polydiallylamine-epichlorohydrin resins. The cross-linked fibers are readily dispersible in water even without fiberization and generally form webs and products having relatively few knits or knots. As such, the cross-linked fibers of the present invention are well suited for use in the manufacture of tissue webs and products, particularly wet-laid tissue webs and products.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: October 29, 2019
    Assignee: KIMBERLY-CLARK WORLDWIDE, INC.
    Inventors: Michael Andrew Zawadzki, Mike Thomas Goulet, Donald Eugene Waldroup, Cathleen Mae Uttecht, Stephen Michael Lindsay
  • Patent number: 10344430
    Abstract: A method for making a specialty fiber by activating pulp in an alkaline aqueous medium, then reacting it a water-soluble, multi-functional reagent able to bridge neighboring cellulose chain within a single fiber. The resultant specialty cellulose fibers have high intrinsic viscosity and may be used to make cellulose ethers, cellulose acetate, and viscose.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: July 9, 2019
    Assignee: RAYONIER PERFORMANCE FIBERS, LLC
    Inventors: Othman A. Hamed, Romuald Krzywanski
  • Patent number: 10156042
    Abstract: Methods of forming crosslinked cellulose include mixing a crosslinking agent with cellulose mat fiber fragments composed of hydrogen-bonded cellulose fibers and having a solids content of about 45-95% to form a substantially homogenous mixture of non-crosslinked, individualized cellulose fibers, drying the resulting mixture to 85-100% solids, then curing the dried mixture under conditions effective to crosslink the cellulose fibers. Some of such methods may include fragmenting a cellulose fiber mat to form the mat fragments. Systems include a mixing unit (such as a high-consistency mixer) configured to form, from the mat fragments and a crosslinking agent, a substantially homogenous mixture of non-crosslinked, individualized cellulose fibers and crosslinking agent, at ambient conditions, a drying unit to dry the substantially homogenous mixture to a consistency of 85-100%, and a curing unit and to cure the crosslinking agent to form dried and cured crosslinked cellulose fibers.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: December 18, 2018
    Assignee: INTERNATIONAL PAPER COMPANY
    Inventors: Charles E. Miller, Alan D. Lovas
  • Patent number: 9995000
    Abstract: Methods of forming crosslinked cellulose include mixing a crosslinking agent with an aqueous mixture of cellulose fibers containing little to no excess water (e.g., solids content of 25-55%), drying the resulting mixture to 85-100% solids, then curing the dried mixture to crosslink the cellulose fibers. Systems include a mixing unit to form, from an aqueous mixture of unbonded cellulose fibers having a solids content of about 25-55% and a crosslinking agent, a substantially homogenous mixture of non-crosslinked, unbonded cellulose fibers and crosslinking agent; a drying unit to dry the substantially homogenous mixture to a consistency of 85-100%; and a curing unit and to cure the crosslinking agent to form dried and cured crosslinked cellulose fibers. Intrafiber crosslinked cellulose pulp fibers produced by such methods and/or systems have a chemical on pulp level of about 2-14% and an AFAQ capacity of at least 12.0 g/g.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: June 12, 2018
    Assignee: INTERNATIONAL PAPER COMPANY
    Inventor: Charles E. Miller
  • Patent number: 9695552
    Abstract: Wet strengthened fiber products, wet strengthening resins, and methods for making such wet strengthened fiber products and wet strengthening resins. The wet strengthened fiber product can include a fiber web and an at least partially cured wet strengthening resin, which prior to at least partially curing, the wet strengthening resin can include a polyamide-epihalohydrin (PAE) resin and a cationic styrene maleimide (SMI) resin. The PAE resin can include a reaction product of a polyamidoamine and an epihalohydrin and the cationic SMI resin can include a reaction product of a styrene maleic anhydride (SMA) copolymer and an amine. The wet strengthened fiber product can include the wet strengthening resin in an amount of about 0.05 wt % to about 5 wt %, based on a dried weight of the wet strengthened fiber product.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: July 4, 2017
    Assignee: Georgia-Pacific Chemicals LLC
    Inventors: Cornel Hagiopol, David F. Townsend, Clay E. Ringold, James W. Johnston
  • Patent number: 9611590
    Abstract: Creping adhesives and methods for making and using same are provided. The creping adhesive can include a first thermosetting polyamidoamine-epihalohydrin resin that includes a reaction product of a first epihalohydrin and a first polyamidoamine containing one or more secondary amine groups, a first thermoplastic polyamidoamine-epihalohydrin resin that includes a reaction product of a second epihalohydrin and a second polyamidoamine containing one or more secondary amine groups, and one or more re-wetting agents. The first thermosetting polyamidoamine-epihalohydrin resin can have a weight average molecular weight of about 800,000 to about 1,200,000 and a molar ratio of the first epihalohydrin to the secondary amine groups of about 0.002:1 to about 0.1:1. The first thermoplastic polyamidoamine-epihalohydrin resin can have a weight average molecular weight of about 40,000 to about 200,000 and a molar ratio of the second epihalohydrin to the secondary amine groups of about 0.001:1 to about 0.1:1.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: April 4, 2017
    Assignee: Georgia-Pacific Chemicals LLC
    Inventors: Clay E. Ringold, David F. Townsend, Cornel Hagiopol, Karla D. Favors, Thomas L. Wright
  • Patent number: 9034145
    Abstract: The invention provides methods and compositions for improving the characteristics of paper substrates. The method involves adding to a paper substrate an NCC-polymer. NCC-polymers have unique chemical properties which result in improvements in wet strength, dry strength and drainage retention properties of the paper substrates.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: May 19, 2015
    Assignee: Ecolab USA Inc.
    Inventors: David J. Castro, Rangarani Karnati, Shawnee M. Wilson, Weiguo Cheng, Mei Liu, Zhiyi Zhang
  • Publication number: 20150119838
    Abstract: A method of producing a modified pulp for use in paper or paper web products, the method comprising treating wood chips in an extraction process to remove hemicellose to form treated wood chips; and subjecting said treated wood chips to chemical or semichemical pulping to form a modified Kraft pulp wherein the amount of hemicellulose contained in the modified Kraft pulp is from about 5 to about 10% by dry weight of the modified pulp.
    Type: Application
    Filed: January 6, 2015
    Publication date: April 30, 2015
    Inventors: ZHENG TAN, GOPAL GOYAL, ALEXANDER A. KOUKOULAS
  • Patent number: 8992728
    Abstract: The cellulose nanofiber production method of the present invention comprises an oxidation treatment step for oxidizing native cellulose in a neutral or acidic reaction solution containing an N-oxyl compound and an oxidizing agent that oxidizes aldehyde groups, and a dispersion step for dispersing the native cellulose in a medium following the oxidation treatment step. According to the production method of the present invention, a cellulose nanofiber is provided that has long fibers and demonstrates high strength.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: March 31, 2015
    Assignee: The University of Tokyo
    Inventors: Akira Isogai, Tsuguyuki Saito
  • Patent number: 8980054
    Abstract: The present invention provides a modified cellulosic fiber having reduced hydrogen bonding capabilities. The modified fiber formed in accordance with the present invention may be useful in the production of tissue products having improved bulk and softness. More importantly, the modified fiber is adaptable to current tissue making processes and may be incorporated into a tissue product to improve bulk and softness without an unsatisfactory reduction in tensile.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: March 17, 2015
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: SeungRim Yang, JeongKyung Kim, Jian Qin
  • Patent number: 8981080
    Abstract: A process for producing a silane-modified cationized polymeric compound, the process including the steps of: (1) cationizing a water-soluble polymeric compound in a mixed solvent of a water-miscible organic solvent and water in the presence of an alkali to produce a slurry containing a cationized polymeric compound, (2) adding an aminosilane compound to the slurry or a cake produced therefrom, thereby treating the cationized polymeric compound with the aminosilane compound, (3) optionally adding an acid to the slurry obtained in step (1) or a product obtained in step (2), and (4) drying a product obtained in step (2) or a product obtained by performing step (3) after step (2), wherein the drying step (4) includes a primary drying treatment step of performing drying at a temperature of 50 to 140° C. under a degree of vacuum of 4.0 to 53.3 kPa, and a secondary drying treatment step of drying the product obtained following the primary drying treatment at a temperature of 90 to 155° C.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: March 17, 2015
    Assignee: LION Corporation
    Inventors: Takeshi Yamada, Youichirou Kohno, Yoko Osako, Yoshifumi Yamagata
  • Patent number: 8968518
    Abstract: A papermaking process includes, firstly, providing carboxylated cellulosic fibers with a carboxyl group content being in the range from 0.06 to 1.5 mmol/g. Then the carboxylated cellulosic fibers are employed to prepare mixing pulp including filler particles, wherein the content of the carboxylated cellulosic fibers in the mixing pulp is in the range from 40% to 100% by dry fiber weight of the mixing pulp. After that, paper is made employing the mixing pulp.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: March 3, 2015
    Assignee: Goldeast Paper (Jiangsu) Co., Ltd.
    Inventors: Yungchang F. Chin, Cui-Xia Wang, Ke-Cheng Fu, Pu Ma, Ren-Rong Wang
  • Publication number: 20150041089
    Abstract: The invention provides methods and compositions for improving the characteristics of paper substrates. The method involves adding to a paper substrate an NCC-polymer. NCC polymers have unique chemical properties which result in improvements in wet strength, dry strength and drainage retention properties of the paper substrates.
    Type: Application
    Filed: August 8, 2013
    Publication date: February 12, 2015
    Applicant: Ecolab USA Inc.
    Inventors: David A. Castro, Rangarani Karnati, Shawnee M. Wilson, Weiguo Cheng, Mei Liu, Zhiyi Zhang
  • Publication number: 20150034263
    Abstract: A method for fibrillation of cellulose includes the following steps: introducing fibre pulp of anionic cellulose at a consistency of 1 to 4% into a homogenizer, and homogenizing fibre pulp in the homogenizer at a pressure of 200 to 1000 bar, advantageously 300 to 650 bar, and by using 2 to 4 passes through for the same fibre pulp under these conditions, and after passes through, taking pulp from the homogenizer, which pulp has been fibrillated by homogenization to a degree than can be expressed as Brookfield viscosity exceeding 10,000 mPa.s (consistency 0.8%, 10 rpm).
    Type: Application
    Filed: February 13, 2013
    Publication date: February 5, 2015
    Inventor: Markus Nuopponen
  • Publication number: 20150020985
    Abstract: A process for improving the wet strength of paper or paperboard is disclosed, and compositions, methods, and products related to improved wet strength paper or paperboard are provided. The process includes, for example, contacting at least one side of the paper or paperboard with water or an aqueous composition to wet the paper or paperboard, contacting the wet paper or paperboard with a wet strength resin composition followed by drying the paper or paperboard. The resulted treated or coated paper or paperboard has comparable wet strength properties to that of paper or paperboard containing wet strength resin from a conventional wet end application.
    Type: Application
    Filed: July 9, 2014
    Publication date: January 22, 2015
    Inventors: Gregg A. Reed, William J. Haskins, Lakeisha D. Talbert
  • Publication number: 20140338851
    Abstract: A water dispersion paper made of wood pulp and/or non-wood pulp is characterized in that purified pulp containing ?-cellulose by 88 percent by weight or more accounts for 15 to 95 percent by weight of all pulp. The water dispersion paper has quick water dispersion property and high strength (printability) and its paper surface pH is 6 to 8 (neutral range).
    Type: Application
    Filed: August 4, 2014
    Publication date: November 20, 2014
    Inventors: Munenaka KOYAMA, Masaki KISHIMOTO, Yoshiaki ISHINO
  • Patent number: 8864945
    Abstract: A method of making a multi-ply wiper/towel product with cellulosic microfibers. The method includes compactively dewatering a nascent web that includes at least about 10% fibrillated cellulosic microfibers and has an apparently random distribution of fibers. The dewatered web having the apparently random distribution of fibers is applied to a transfer surface. The web is belt-creped from the transfer surface utilizing a generally planar polymeric creping belt provided with a plurality of perforations through the belt. The belt-creping step occurs under pressure in a belt creping nip defined between the transfer surface and the creping belt. The web is dried to form a dried web that includes a plurality of fiber-enriched hollow domed regions protruding from an upper side of the dried web. The hollow domed regions have a sidewall of a relatively high local basis weight formed along at least a leading edge thereof.
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: October 21, 2014
    Assignee: Georgia-Pacific Consumer Products LP
    Inventors: Joseph H. Miller, Daniel W. Sumnicht, Ayanna M. Bernard, Sanjay Wahal
  • Patent number: 8864944
    Abstract: A method of making a multi-ply wiper/towel product with cellulosic microfibers. The method includes compactively dewatering a nascent web that includes at least about 10% fibrillated cellulosic microfibers and has an apparently random distribution of fibers. The dewatered web having the apparently random distribution of fibers is applied to a transfer surface. The web is belt-creped from the transfer surface utilizing a creping belt. The belt-creping step occurs under pressure in a belt creping nip defined between the transfer surface and the creping belt. The web is dried to form a dried web having a plurality of fiber-enriched hollow domed regions protruding from an upper side of the dried web. The hollow domed regions have a sidewall of a relatively high local basis weight formed along at least a leading edge thereof.
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: October 21, 2014
    Assignee: Georgia-Pacific Consumer Products LP
    Inventors: Joseph H. Miller, Daniel W. Sumnicht, Ayanna M. Bernard, Sanjay Wahal
  • Publication number: 20140305605
    Abstract: A papermaking process includes, firstly, providing carboxylated cellulosic fibers with a carboxyl group content being in the range from 0.06 to 1.5 mmol/g. Then the carboxylated cellulosic fibers are employed to prepare mixing pulp including filler particles, wherein the content of the carboxylated cellulosic fibers in the mixing pulp is in the range from 40% to 100% by dry fiber weight of the mixing pulp. After that, paper is made employing the mixing pulp.
    Type: Application
    Filed: August 28, 2013
    Publication date: October 16, 2014
    Applicant: Goldeast Paper (Jiangsu) Co., Ltd
    Inventors: YUNGCHANG F. CHIN, CUI-XIA WANG, KE-CHENG FU, PU MA, REN-RONG WANG
  • Publication number: 20140302336
    Abstract: The present invention relates to a process for producing a dispersion comprising microfibrillated cellulose and nanoparticles wherein the process comprises the steps; providing a slurry comprising pre-treated cellulose fibers, adding nanoparticles to the slurry and treating the slurry by mechanical disintegration so that a dispersion comprising microfibrillated cellulose is formed in which the nanoparticles are being absorbed to the surface of the microfibrillated cellulose and/or being absorbed into the microfibrillated cellulose. The invention further relates to a dispersion produced according to the process, a paper or board product being coated with a coating comprising said dispersion and a paper or board product being produced from said dispersion as well as a composite comprising said dispersion.
    Type: Application
    Filed: October 25, 2012
    Publication date: October 9, 2014
    Inventors: Isto Heiskanen, Lars Axrup, Mari-Ann Norborg, Isabel Knöös
  • Publication number: 20140290882
    Abstract: Carboxylated, mercerized cellulose fiber having at least 12 meq/100 g of carboxyl substitution at the C-6 position of the anhydroglucose units, which includes at least 20% cellulose II, may be produced by catalytically carboxylating mercerized cellulose fiber in at least two catalytic carboxylation stages in a continuous series in which the pH is adjusted, and a primary oxoammonium salt catalyst (or precursor thereof) and secondary oxidant is added, at the beginning of each stage. Optionally, the carboxylated, mercerized cellulose may be made substantially free of aldehyde groups by means of a stabilizing step following the final carboxylation stage, in which aldehyde groups present in the fibers are converted to carboxyl groups.
    Type: Application
    Filed: March 29, 2013
    Publication date: October 2, 2014
    Applicant: WEYERHAEUSER NR COMPANY
    Inventor: S. Ananda Weerawarna
  • Patent number: 8785623
    Abstract: The present invention relates to ferromagnetic materials based on nano-sized bacterial cellulose templates. More specifically, the present invention provides an agglomerate free magnetic nanoparticle cellulose material and a method of forming such magnetic nanoparticle cellulose material. Further, the magnetic nonoparticles are physically attached on the cellulose material and evenly distribute.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: July 22, 2014
    Assignee: Cellutech AB
    Inventors: Richard T. Olsson, My Ahmed Said Samir Azizi, Lars Berglund, Ulf W. Gedde
  • Patent number: 8784611
    Abstract: The invention relates to a process for the production of paper or board comprising: adding a retention system to a stream of stock entering a paper machine head box, directing the stream of stock to a wire, de watering the stream of stock on the wire to form a paper web, and drying the paper web, wherein the retention system comprises a water-soluble cationic polymer, and nanocellulose acting like a micro particle, wherein the nanocellulose is added in an amount of less than 1% as active substance based on dry solids weight of the stock.
    Type: Grant
    Filed: November 3, 2010
    Date of Patent: July 22, 2014
    Assignee: Kemira OYJ
    Inventors: Ari Juppo, Ulf Stenbacka
  • Publication number: 20140186576
    Abstract: A nonwoven web of unmodified or cyanoethylated nanocellulose was found to have greater strength than kraft paper after immersion in oil at high temperature, making it useful as an insulation material for transformers. A mixture of nanocellulose and polymetaphenylene isophthalamide has further improved properties for use as an insulating material.
    Type: Application
    Filed: December 28, 2012
    Publication date: July 3, 2014
    Applicant: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: MARK ANDREW HARMER, Ann Y. Liauw, Byoung Sam Kang, Mark A. Scialdone
  • Publication number: 20140166222
    Abstract: A composition for use as a strengthening agent in the wet-end of papermaking which comprises a surface modified non-wood plant fiber and a starch component.
    Type: Application
    Filed: July 25, 2012
    Publication date: June 19, 2014
    Applicant: CARGILL, INCORPORATED
    Inventors: Rita Delrue, Peter Leonhardt, Dogan Sivasligil
  • Patent number: 8728273
    Abstract: The present invention relates to a process for the production of a composition wherein the process comprises pre-treating cellulosic fibers by mechanical, chemical and/or enzymatic treatment, mixing the pre-treated cellulosic fibers with pigments forming a dispersion and dispersing the dispersion of pre-treated cellulosic fibers and pigments whereby a composition comprising microfibrillated cellulose is formed. The invention further relates to a composition produced according to the process.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: May 20, 2014
    Assignee: Stora Enso OYJ
    Inventors: Isto Heiskanen, Kaj Backfolk
  • Patent number: 8728272
    Abstract: Although a microfibrillated cellulose has been conventionally added to a resin molded article for the purpose of improving the properties of resin such as strength, it is only possible to achieve the same level of strength as that of the resin itself. The object is to provide a resin molded article of greater strength. A molded article can be produced by blending resin with a microfibrillated cellulose having a type-II crystalline structure produced by treating a microfibrillated cellulose with an alkali solution. The molded article can be largely increased in tensile strength or flexural strength, tensile strain at break or flexural strain at break, and fracture toughness (work-of-fracture) compared to a molded article produced with resin containing a conventional microfibrillated cellulose.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: May 20, 2014
    Assignee: Kyoto University
    Inventors: Hiroyuki Yano, Antonio Norio Nakagaito
  • Patent number: 8679292
    Abstract: A method is conceived for producing hydrophobic lignocellulosics based on the graft copolymerisation of vinyl-type monomers onto the lignocellulosic backbone initiated by a redox couple initiator in aqueous medium. The green modification process can be carried out on any lignocellulosic material, for example, chemical, chemi-thermomechanical or thermo-mechanical pulps, bleached or unbleached. The technology disclosed in this invention yields individual lignocellulosic entities, for instance, hydrophobic pulp fibers, that can be used in combination with other fibers or polymers to produce nonwoven fibrous materials or composites. A significant aspect of the invention is that the modified lignocellulosic material possesses an efficient hydrophobic barrier and minimum interfacial energy to generate optimum adhesion when introduced to polymer resins.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: March 25, 2014
    Assignee: Fpinnovations
    Inventors: Wadood Y. Hamad, Ali Hayek
  • Patent number: 8662316
    Abstract: A filter medium for liquid filtration of fine texture exhibiting high strength when wetted with water, which filter medium is comprised of a wet-laid nonwoven fabric. There is provided a filter medium for liquid filtration comprised of a wet-laid nonwoven fabric, characterized in that through blending of 0.5 to 40 wt. % of unbeaten natural fibers, it exhibits a very fine texture, a lowering ratio, calculated from bursting strength in ordinary state and bursting strength when wetted with water, of 30% or below, and a bursting strength, had when wetted with water, of 300 kPa or greater.
    Type: Grant
    Filed: July 21, 2004
    Date of Patent: March 4, 2014
    Assignee: Hokuetsu Paper Mills, Ltd.
    Inventors: Nobuyuki Sakadume, Eiko Meguro, Toshihiko Soyama
  • Patent number: 8663425
    Abstract: The present invention provides a method for easily and efficiently manufacturing microfibrous cellulose composite sheets. The present invention is a method for manufacturing microfibrous cellulose composite sheets, including a preparation process in which a polymer emulsion is mixed with an aqueous suspension including microfibrous cellulose, thereby preparing a mixed fluid, a papermaking process in which the mixed fluid is dehydrated on a porous base material through filtration, and a sheet including moisture is formed, and a drying process in which the sheet including moisture is heated and dried. In addition, the present invention is a method for manufacturing a microfibrous cellulose composite sheet laminate, in which the microfibrous cellulose sheets are thermally compressed and thus laminated as they are or after being provided with a polymer layer on at least one surface thereof.
    Type: Grant
    Filed: July 22, 2010
    Date of Patent: March 4, 2014
    Assignee: Oji Holdings Corporation
    Inventors: Yasutomo Noishiki, Takashi Kawamukai, Mitsuru Tsunoda, Yoshiyuki Asayama
  • Publication number: 20140053995
    Abstract: The present invention is directed towards a method for spinning anionically modified cellulose comprising the steps of: (a) preparing a suspension of the anionically modified cellulose in a continuous phase; (b) subjecting the suspension to high shear rate; (c) performing spinning by extruding the cellulose suspension through a spinneret into a spinbath comprising a cationic complexing agent, and (d) isolating the sun fibres from the spin bath; as well as fibres obtained based on the method of the invention and paper or board products derived from such fibres.
    Type: Application
    Filed: March 8, 2012
    Publication date: February 27, 2014
    Applicant: Sappi Netherlands Services B.V.
    Inventor: Ian Graveson
  • Publication number: 20140041821
    Abstract: The present invention is directed towards a method for spinning neutral or anionically modified cellulose comprising the steps of: (a) preparing a suspension of the neutral or anionically modified cellulose in a continuous phase; (b) subjecting the suspension to high shear rate; (c) performing spinning by extruding the cellulose suspension into an airgap region comprising at least one heated zone to obtain spun fibres, (d) subjecting the spun fibres to at least one washing stages and (e) isolating the spun fibres from the at least one washing stages; as well as fibres obtained based on the method of the invention and paper or board products derived from such fibres.
    Type: Application
    Filed: March 8, 2012
    Publication date: February 13, 2014
    Applicant: SAPPI NETHERLANDS SERVICES B.V.
    Inventors: Ian Graveson, Philip Turner
  • Patent number: 8647470
    Abstract: Process for the production of paper, board and cardboard having high dry strength by addition of an aqueous composition comprising a nanocellulose and at least one polymer selected from the group consisting of the anionic polymers and water-soluble cationic polymers, draining of the paper stock and drying of the paper products.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: February 11, 2014
    Assignee: BASF SE
    Inventor: Anton Esser
  • Patent number: 8641869
    Abstract: A method for making particles containing carboxyalkyl cellulose, comprising blending a carboxyalkyl cellulose and a starch in water to provide an aqueous gel; treating the aqueous gel with a crosslinking agent to provide a crosslinked gel; drying the crosslinked gel to provide a solid; comminuting the solid to provide a plurality of particles.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: February 4, 2014
    Assignee: Weyerhaeuser NR Company
    Inventor: S Ananda Weerawarna
  • Patent number: 8632658
    Abstract: A multi-ply wiper/towel product includes at least one wet laid web having at least 10% fibrillated cellulosic microfiber, and at least about 40% wood pulp derived papermaking fibers. The at least one wet laid web has formed therein (i) a plurality of fiber-enriched hollow domed regions on the upper side of the at least one wet laid web having a relatively high local basis weight, (ii) connecting regions having a relatively lower local basis weight forming a network interconnecting the relatively high local basis weight domed regions of the one wet laid web, and (iii) transition areas with upwardly and inwardly inflected consolidated fibrous regions transitioning from the connecting regions into the domed regions.
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: January 21, 2014
    Assignee: Georgia-Pacific Consumer Products LP
    Inventors: Joseph H. Miller, Daniel W. Sumnicht, Ayanna M. Bernard, Sanjay Wahal
  • Patent number: 8613363
    Abstract: Disclosed is an integrated paper wherein the paper has capabilities and functionalities provided by both the fiber and the active agent ingredients, and a method of immobilizing the active agents within the integrated paper. The tight pore structure of the integrated paper of the present invention, a mean pore diameter of less than about 2 microns, provides short diffusion distances from a fluid to the surface of the paper ingredients by adsorption or diffusive interception making it an excellent medium for fluid filtration. The integrated paper of the present invention can further include a microbiological interception enhancing agent. The integrated paper can be formed using, preferably, wet laid paper-making processes for speed and efficiency. Also disclosed are devices utilizing the integrated paper useful in fluid filtration.
    Type: Grant
    Filed: October 28, 2009
    Date of Patent: December 24, 2013
    Assignee: KX Technologies LLC
    Inventor: Evan E. Koslow
  • Patent number: 8540846
    Abstract: A multi-ply wiper/towel product includes at least one wet laid web including at least 10% fibrillated cellulosic microfiber, and at least about 40% wood pulp derived papermaking fibers. The at least one wet laid web has formed therein (i) a plurality of fiber-enriched hollow domed regions on the upper side of the at least one wet laid web having a relatively high local basis weight, and (ii) connecting regions of a relatively lower local basis weight forming a network interconnecting the relatively high local basis weight domed regions of the one wet laid web. Transition areas are provided in the at least one wet laid web with upwardly and inwardly inflected consolidated fibrous regions transitioning from the connecting regions into the domed regions, and the at least one wet laid web exhibits a differential pore volume for pores under 5 microns in a diameter of at least about 75 mm3/g/micron.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: September 24, 2013
    Assignee: Georgia-Pacific Consumer Products LP
    Inventors: Joseph H. Miller, Daniel W. Sumnicht, Ayanna M. Bernard, Sanjay Wahal
  • Publication number: 20130197461
    Abstract: A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.
    Type: Application
    Filed: March 13, 2013
    Publication date: August 1, 2013
    Applicant: GP Cellulose GmbH
    Inventor: GP Cellulose GmbH
  • Patent number: 8497410
    Abstract: A method of making personal hygiene articles of high absorbency from cellulosic fiber pulp without chemical cross-linking of the cellulosic fibers is disclosed. The method comprises interposing a sublayer of mechanically fluffed alkali extracted cellulosic fiber pulp between a fluid permeable layer and a fluid impermeable layer.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: July 30, 2013
    Assignee: Rayonier TRS Holdings Inc.
    Inventors: Phyllis Leithem, Charles A. Kremers, W. Paul Harrell, Stephen Lewis, Karl D. Sears, Quan He, Peter R. Abitz
  • Patent number: 8435345
    Abstract: A method of curing cementitious material comprising added a carboxylated bleached wood pulp fiber to the material during mixing. The fiber has a carboxyl content of from 10 to 70 meq/100 g cellulose fiber. The fibers are 0.1 to 5% by weight of the dry weight of the cementitious material. The structure produced by the method. The autogenous shrinkage of the cementitious material is reduced.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: May 7, 2013
    Assignee: Weyerhaeuser NR Company
    Inventors: John A. Westland, David J. O'Callaghan
  • Publication number: 20130087298
    Abstract: A sensor wipe, made in part by a hydroentangling or conforming process, includes fibers onto which an indicator dye is immobilized. The substrate may be used to make sensor wipes for testing surface conditions, including but not limited to pH or the presence of certain microbes. The indicator dye does not leach from the sensor wipe. The indicator dye may be reversible so that the sensor wipe can be reused prior to disposal.
    Type: Application
    Filed: October 5, 2011
    Publication date: April 11, 2013
    Inventors: Ronnie Lee Phillips, Kelly Dean Branham, Stephanie Michelle Martin, John Gavin MacDonald, David William Koenig
  • Publication number: 20130025807
    Abstract: The present invention relates to a process for producing an oxidised cellulose pulp fibrillar network and a composite with lignocellulosic fibres comprising the following steps: (a) oxidising a cellulose pulp to obtain about 0.3 to 2.5 mmol carboxylic groups per gram cellulose pulp; and about 0.1 to 5.0 mmol aldehyde groups per gram cellulose pulp; (b) homogenisation of the cellulose pulp of step (a) wherein the cellulose fibres are refined to provide a cellulose pulp comprising 0-50% of fibres having an average length 0.7 mm-2.1 mm; and 50-100% of fibres having a particle size of 0.05-500 micrometer (?m); and optionally (c) combining with lignocellulosic fibre. Also step (d) drying of the cellulose pulp obtained by step (b) or step (c) may be included in the process.
    Type: Application
    Filed: January 18, 2011
    Publication date: January 31, 2013
    Applicant: SÖDRA SKOGSÄGARNA EKONOMISK FÖRENING
    Inventors: Fredrik Wernersson, Harald Brelid, Hans Theliander, Kristoffer Lund
  • Publication number: 20130005869
    Abstract: The present invention provides a novel cationized microfibrillated plant fiber and a method for manufacturing the same. A cationic microfibrillated plant fiber that is cationically modified with a quaternary-ammonium-group-containing compound, and that has an average diameter of 4 to 200 nm.
    Type: Application
    Filed: February 4, 2011
    Publication date: January 3, 2013
    Inventors: Hiroyuki Yano, Tadafumi Hashimoto, Akihiro Sato, Antonio Norio Nakagaito, Kazuo Kitagawa, Takeshi Semba, Akihiro Ito
  • Publication number: 20120283363
    Abstract: A composite material of the invention is a mixture of cellulose microfibers having a carboxyl group content of 0.1 to 3 mmol/g and a moldable polymeric material selected from the group consisting of a biomass-derived polymer and a petroleum-derived polymer. The biomass-derived polymer is preferably polylactic acid or pulp. The cellulose microfibers are preferably present in an amount of 0.01% to 60% by mass. Another composite material of the invention is a mixture of cellulose composite microfibers and a moldable resin, the cellulose composite microfibers being obtained by adsorbing a surfactant onto cellulose microfibers having a carboxyl group content of 0.1 to 3 mmol/g.
    Type: Application
    Filed: December 10, 2010
    Publication date: November 8, 2012
    Applicant: KAO CORPORATION
    Inventors: Yoshiaki Kumamoto, Kenta Mukai, Hironobu Kawajiri, Akira Takenaka, Taiki Yoshino, Akira Isogai, Motoi Konishi, Tetsuji Kito
  • Patent number: 8287692
    Abstract: Cellulose nanofibers are produced using a 4-hydroxy TEMPO derivative by treating a cellulosic material with an oxidizing agent in water in the presence of a cellulose oxidation catalyst containing an N-oxyl compound to prepare oxidized cellulos, and microfibrillating the oxidized cellulose.
    Type: Grant
    Filed: December 25, 2008
    Date of Patent: October 16, 2012
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Shoichi Miyawaki, Shiho Katsukawa, Hiroshi Abe, Yuko Iijima, Akira Isogai
  • Publication number: 20120199298
    Abstract: The present invention relates to cationic polymers, such as polyaminoamide epichlorohydrin (PAE), that are derived from renewable resources and can be used to produce wet strength resins suitable for a variety of applications, such as in absorbent paper articles.
    Type: Application
    Filed: February 3, 2011
    Publication date: August 9, 2012
    Inventor: John Collins Dyer
  • Publication number: 20120199299
    Abstract: The present invention relates to cationic polymers, such as polyaminoamide epichlorohydrin (PAE), that are derived from renewable resources and can be used to produce wet strength resins suitable for a variety of applications, such as in absorbent paper articles.
    Type: Application
    Filed: January 17, 2012
    Publication date: August 9, 2012
    Inventor: John Collins Dyer
  • Patent number: 8216425
    Abstract: An absorbent paper sheet for tissue or towel includes from about 99 percent to about 70 percent by weight of cellulosic papermaking fiber and from about 1 percent to about 30 percent by weight fibrillated regenerated cellulose microfiber which was regenerated form a cellulosic dope utilizing a tertiary amine N-oxide solvent or an ionic liquid.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: July 10, 2012
    Assignee: Georgia-Pacific Consumer Products LP
    Inventors: Daniel W. Sumnicht, Bruce J. Kokko
  • Publication number: 20120125547
    Abstract: An object of the invention is to provide cellulose fibers which can give a cellulose composite that renders high transparency, a reduction in linear expansion coefficient, and a high modulus of elasticity possible. The invention relates to: a process for producing modified cellulose fibers which includes a modification reaction step of reacting cellulose with an aromatic compound in an organic acid to thereby modify the cellulose with an aromatic-ring-containing substituent; cellulose fibers modified with aromatic-ring-containing substituent; a dispersion of the cellulose fibers; and a cellulose fiber composite obtained from the same.
    Type: Application
    Filed: December 12, 2011
    Publication date: May 24, 2012
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventor: Hideko AKAI