With Coating After Drying Patents (Class 162/135)
  • Patent number: 6071475
    Abstract: A process is disclosed for preserving paper involving the following steps:(a) a plurality of paper layers in contact with one another at least in regions is simultaneously brought into contact with a preservative fluid containing polycondensates based on one or more hydrolytic polycondensation-capable compounds of elements M of main groups III-V and sub-groups II-IV of the Periodic Table; in said polycondensates, at least one organic group (G) with at least two carbon atoms and for each carbon atom at least one atom selected from hydrogen or fluorine and without polar substituents is bound, either directly via one of the carbon atoms or via a connecting group A, to at least 0.1% of the central atoms M; and(b) the paper thus treated with the preservative fluid is dried and/or hardened.
    Type: Grant
    Filed: May 21, 1998
    Date of Patent: June 6, 2000
    Assignee: Institut fur Neue Materialien Gemeinnutzige
    Inventors: Helmut Schmidt, Reiner Kasemann, Stefan Sepeur, Helmut Duddeck
  • Patent number: 6068733
    Abstract: A recording material for the ink jet printing process, comprising a paper support and an ink absorbing layer containing a pigment and a binding agent characterised in that the paper contains a mixture of softwood sulphate and eucalyptus cellulose, and has a wet stretch in the transverse direction<3.0%, a tearing length ratio longitudinal/transverse<2, a stiffness ratio longitudinal/transverse<2 and a density<0.8 g/cm.sup.3.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: May 30, 2000
    Assignee: Felix Schoeller Jr. Foto-und Spezialpapiere GmbH & Co. KG
    Inventors: Wolfgang Storbeck, Gerhard Dransmann
  • Patent number: 6054021
    Abstract: An authenticatable paper product is prepared by adding to a papermaking furnish fibers treated with from about 50-200 lb/ton of a fluorescent whitening agent (FWA). The paper made from the papermaking furnish will include fluorescent cellulosic fibers in an amount ranging from between 0.1-4.0 lb/ton to achieve FWA concentrations within the range of 1-20 ppm.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: April 25, 2000
    Assignee: Westvaco Corporation
    Inventors: Frederick L. Kurrle, Christopher J. Parks
  • Patent number: 6054020
    Abstract: Amine-modified polysiloxanes are applied to the opposite outer surfaces of a tissue product, such as the two outer surfaces of a 3-ply facial tissue, providing improved softness to the surfaces and a degree of hydrophobicity to prevent wet through of liquids during use. However, the degree of hydrophobicity is controlled by the chemical structure of the amine-modified polysiloxane and/or by blending the amine-modified polysiloxane with a more hydrophilic modified polysiloxane such that liquid is still allowed to enter the tissue structure in a reasonably short time to be absorbed by the center ply, but the absorption in combination with the hydrophobicity of the other outer surface substantially delays the liquid from passing completely through the tissue product.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: April 25, 2000
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Mike Thomas Goulet, Dale Alan Burghardt, Duane Gerard Krzysik
  • Patent number: 6051107
    Abstract: A process for preparing sized paper which incorporates in the paper a size composition containing polymer latex, wherein the polymer contained in the polymer latex is anionic polymer having properties selected from the group consisting of T.sub.G about -15.degree. C. to about 50.degree. C. and acid number about 30 to about 100, and wherein the polymer latex has a zeta potential of from about -25 to about -70 millivolts over the pH range of about 5 to about 9. A preferred process has the steps: a) providing an aqueous pulp suspension; b) sheeting and drying the aqueous pulp suspension to obtain paper; c) treating the paper by applying to at least one surface of it the size composition containing polymer latex and starch; and d) drying the paper to obtain sized paper. Preferred anionic polymers are copolymers of monomers comprising styrene or substituted styrene, alkyl acrylate or methacrylate and ethylenically unsaturated carboxylic acid.
    Type: Grant
    Filed: April 28, 1997
    Date of Patent: April 18, 2000
    Assignee: Hercules Incorporated
    Inventor: Daniel Felix Varnell
  • Patent number: 6051106
    Abstract: Provided is a cast-coated paper which comprises a raw paper having on at least one side thereof a layer of a coating composition comprising a pigment and a water based binder, with the layer having a surface treated with a coagulating solution containing one or more of an ammonium salt as a coagulant and smoothened by pressing the treated surface to a hot specular surface of metal while the layer is in a wet condition; and a method of producing the aforesaid cast-coated paper.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: April 18, 2000
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Tomonobu Omura, Takashi Ueno, Toshikazu Teramasa, Yoshihiro Kuroyama
  • Patent number: 6048439
    Abstract: The invention disclosed herein is directed to a modified rosin emulsion, to methods for making the modified emulsion and to uses for the emulsion. The modified emulsion of the invention is made by mixing emulsified rosin solids with a water soluble salt of an alkylene-acrylic acid copolymer.
    Type: Grant
    Filed: February 2, 1998
    Date of Patent: April 11, 2000
    Assignee: International Paper Company
    Inventors: Yan C. Huang, M. Bruce Lyne, John H. Stark
  • Patent number: 6030675
    Abstract: The invention relates to tissue products having improved softness properties and methods of making them. Specifically, improved softness is achieved by incorporating a cationic silicone amidoamine ester or phosphate and, optionally, one or more softeners/debonders into the fiber furnish at the wet end of the tissue machine prior to formation, followed by an optional topical treatment with a cationic silicone amidoamine ester or phosphate and/or one or more softeners/debonders after the tissue web is formed. The result is a tissue product with added bulk and a smooth surface feel, both properties contributing to improved softness characteristics.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: February 29, 2000
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Wen Zyo Schroeder, Gary Lee Shanklin
  • Patent number: 6024832
    Abstract: A method for producing extensible paper, comprising the following stages:feeding a mix of vegetable fibres to a kneader member,mixing the mix with water in the kneader,beating the fibres to obtain a pulp,transferring the beaten pulp into a flow chest,feeding the beaten pulp from the flow chest onto a paper web formation cloth with consequent reduction of the water percentage by gravity and vacuum,pressing the web, with consequent further reduction of its water content,initial drying of the paper web to a substantially constant moisture content of between 15% and 65%,compacting,final drying to a moisture content of between 15% and 4%, preferably 10%-8%,glazing,wherein:the beating stage is carried out by rubbing the fibres in a multistage unit to obtain a pulp having a degree of beating of at least 30.degree.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: February 15, 2000
    Assignee: Giorgio Trani Cartiere Cariolaro S. p. A.
    Inventors: Giorgio Trani, Norberto Cariolaro
  • Patent number: 6022450
    Abstract: Paper and cardboard containing starch and protein fractions of flour having improved strength, stiffness and surface properties, wherein the starch and protein fractions are subjected to a degradation with ammonium persulfate, amylase, an acid, protease or a combination thereof before being introduced to the paper or cardboard. After the starch and protein fractions have been degraded, they can be added to the paper fiber matrix or used as a sizing or glue.
    Type: Grant
    Filed: May 7, 1998
    Date of Patent: February 8, 2000
    Assignee: Roermond Papier B.V.
    Inventors: Louis Peter Marie Van Kessel, Gerardus Henricus Andreas Kuypers, Matheus Petrus Marie Maessen
  • Patent number: 6022449
    Abstract: The use of water-dispersible polyisocyanates with anionic and/or potentially anionic groups and cationic and/or potentially cationic compounds in paper finishing leads not only to higher retention but also to improved dry and wet strength and sizing.
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: February 8, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernhard Jansen, Joachim Konig, Peter Nowak
  • Patent number: 6022448
    Abstract: The present invention relates to coated paperboard for formed articles, which paperboard consists of a fibermatrix in one, two or more layers and a coating and has adequate surface for printing and adequate surface gloss for each specific type of formed articles. The paperboard has been calendered after coating with a heatable calender having a soft extended nip, and has reduced density and reduced grammage at a given value for bending force compared to corresponding coated paperboard which has been calendered before or during and after coating with a heatable or non-heatable calender having a hard or soft nip. Additionally, a production line for the production of such coated paperboard, a process for the production of such coated paperboard, and a method of reducing the susceptibility to crack formation at folding of such a coated paperboard, are described.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: February 8, 2000
    Assignee: Korsnab AB
    Inventors: Goran Eriksson, Klas-Erik Karlsson, Nils .ANG.ke Larsson, Sven H.ang.kansson
  • Patent number: 6017419
    Abstract: A metering size press rod assembly specifically for use in a paper-making machine is stored and transported in a container and use in the paper-making machine. A plurality of metering size press rod assemblies are assembled. A storage sand transport container is provided at shipping location. The container includes a plurality of elongate openings therein. Each metering size press rod assembly is loaded into a corresponding one of the elongate openings in the container. The container is then transported to a user location, the metering size press assemblies are then sequentially and individually removed from the container, used in the papermaking machine and reloaded into the elongate openings in the container. The container with the used metering size press rod assemblies is the transported back to the shipping location.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: January 25, 2000
    Assignee: Voith Sulzer Paper Technology North America, Inc.
    Inventors: Edwin X. Graf, James A. Eng
  • Patent number: 6013359
    Abstract: A printing paper, especially a newsprint base paper, comprising: a base paper; and a coating layer for improving surface strength of the coated paper and releasing-property when two sheets of the coated paper are stacked, which coating layer is formed on the base paper by using a coating-transcription system such as a gate roll coating system, which coating layer comprises at least either a homopolymer polyacrylamide or a nonionic-copolymer polyacrylamide in a coating weight of from 0.01 g/m.sup.2 to 0.2 g/m.sup.2, wherein the homopolymer polytcrylamide and the nonionic-copolymer polyacrylamide have a weight average molecular weight ranging from 20,000 to 250,000, thereby improving not only surface strength but also releasing-property in a printing paper, especially in a newsprint paper having a basis weight less than 46 gm.sup.2.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: January 11, 2000
    Assignees: Nippon Paper Industries Co., Ltd., Seiko Chemical Industry Co., Ltd.
    Inventors: Toshiyuki Takano, Motoi Fukuda, Toshimi Satake, Masahide Taniguchi
  • Patent number: 6008289
    Abstract: The present invention relates to pigmented coating slip suitable for the production of coated papers and boards containing(a) a coating pigment,(b) 5 to 20%, based on the coating pigment, of at least one synthetic binder,(c) optionally, 0.01 to 20%, based on the coating pigment, of a naturally occurring binder,(d) optionally, 0.01 to 5%, based on the coating pigment, of a cobinder,(e) 0.01 to 5%, based on the coating pigment, of an optical brightener,(f) 0.01 to 5%, based on the coating pigment, of at least one water-dispersible polyisocyanate, and(g) optional additives.
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: December 28, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Joachim Konig, Eckhard Wenderoth, Jurgen Kopp, Gottfried Wallpott
  • Patent number: 6001165
    Abstract: A coating composition for a recording material and a process for producing the recording material are provided, wherein the coating composition includes an aluminum alkoxide, a binder and a hydrophilic solvent.
    Type: Grant
    Filed: June 24, 1998
    Date of Patent: December 14, 1999
    Assignee: Oji-Yuka Synthetic Paper Co., Ltd.
    Inventors: Nobuhiro Shibuya, Toshiyuki Hirabe, Koichi Asami, Masahiro Satoh, Hajime Kanbara
  • Patent number: 5997692
    Abstract: A system for applying a suspension of uncooked starch particles in water to a web on a forming wire includes a source of such suspension and a source of dilution water, an application die positioned transversely of the web with an internal manifold opening into a downwardly opening die slot through which material flows from the manifold as a falling curtain onto the web. The die has a plurality of transversely spaced inlets leading into the manifold to define transversely spaced application zones across the web. The suspended starch and water are applied from the manifolds through control valves into the inlets by means of which the consistency or concentration of the starch may be varied at positions representing the application zones across the web to provide a desired strength profile to the dried web.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: December 7, 1999
    Assignees: GL&V-Paper Machine Group, Inc., Jefferson-Smurfit Corporation
    Inventors: John A. Taylor, Marcus F. Foulger, Joseph E. Parisian, III, Hanuman P. Didwania, Clyde H. Sprague
  • Patent number: 5993603
    Abstract: Transparentized paper is prepared by impregnating a paper web with a solution of a sucrose acetate isobutyrate in a lower alcohol and removing the residual alcohol. The preferred paper is 100% cotton rag content, the preferred lower alcohol solvent contains up to 5 carbon atoms, particularly isopropanol. In production, the transparentizing solution is applied to one side of a travelling paper web, excess solution is removed by an air knife, wire wound rod or other means, and residual solvent is removed by impinging hot air on the travelling web. The sucrose acetate isobutyrate can also be applied when fluidized by heating and in the absence of a solvent. The preferred content of sucrose acetate isobutyrate residual in the paper web is from about 10% to about 50% of the paper content of the transparentized paper.
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: November 30, 1999
    Assignee: Association of Capital and Employees, Inc.
    Inventor: Robert C. Johnston
  • Patent number: 5972167
    Abstract: A transfer roll coating color is described comprising a pigment and an adhesive as main components, wherein the average aspect ratio of the pigment is 10 or less, the adhesive is a low viscosity starch adhesive, the solids content of the color is about 58 weight % or higher, and the viscosity of the color determined at 60 rpm by using a No. 4 rotor of a Brookfield.TM. viscometer is 1,500 cps or less. Coated papers obtained by transfer roll coating using the colors at an amount of 5 g/m2 or higher per side also are disclosed.
    Type: Grant
    Filed: August 20, 1997
    Date of Patent: October 26, 1999
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Hideki Hayasaka, Osamu Kozuka, Katsuhiko Matsunaga, Hideki Fujiwara
  • Patent number: 5952091
    Abstract: A web printing paper, including a coating base paper which contains mineral filler and at least one of wood pulp and cellulose as fiber components. The coating base paper has a grammage of 30 to <58 g/m.sup.2, and a filler content, relative to its grammage, equal to 15 to 35% by weight. The coating base paper selectively contains, in addition to the at least one of wood pulp and cellulose, up to <50% by weight recycled fibers, all weight parts adding up to 100% by weight. The printing paper further includes a coating applied to both sides of the base paper by a film press so as to absorb printing ink. The coating contains pigment and binder. The coating on each side of the base paper has a grammage of 2 to 12 g/m.sup.2, and the pigment of the coating has a grain size, 40 to 60% by weight, of <2 .mu.m.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: September 14, 1999
    Assignee: Stora Feldmuhle AG
    Inventors: Dieter Horand, Adam Gurtler, Bernd Pelech, Paul-Heinz Dahling
  • Patent number: 5942086
    Abstract: The invention relates to a process of applying a polyhydroxy high molecular weight polymer or like material to a substrate, comprising adding to a solution of such material in anionic form a flocculent of oppositely charged form in order to insolubilise such material, and thereafter applying such insolubilised material to said substrate. The invention has particular application in respect of production of paper by adding to the slurry supplied in paper production of an anionic starch and a cationic flocculent in predetermined amounts. The cationic polymer is preferably added prior to addition of the anionic starch. The cationic polymer preferably has a molecular weight of 150,000 or more and the anionic starch is preferably added in an amount of from 75% to 125% of the reaction ratio amount. Preferably, the cationic polymer flocculent is added in an amount of 0.5 kg or more per 1,000 kg of paper substrate and the anionic starch showing an amount of 2 kg or more per 1,000 kg of paper substrate.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: August 24, 1999
    Assignee: Philip Chem-Solv, Inc.
    Inventor: David Malcolm Owen
  • Patent number: 5928473
    Abstract: The present invention relates to a method for the inhibition of photo-yellowing in paper rich in lignin by treatment of pulp or paper rich in lignin with a compound containing hydroxy functionalities that are capable of forming a ketal with a carbonyl group in an acidic environment. In a preferred embodiment the acidic environment is provided by the presence of an acidic clay or an acidic zeolite.
    Type: Grant
    Filed: January 15, 1997
    Date of Patent: July 27, 1999
    Assignee: University of Ottawa
    Inventors: David Victor Avila, Juan Cesar Scaiano
  • Patent number: 5916418
    Abstract: The specification discloses a method for improving the lay flat properties of paper which comprises applying to a cellulosic fibrous web an aqueous solution consisting essentially of a dialdehyde, preferably glyoxal, and from about 50 to about 150 parts by weight of a polyol, preferably glycerol, per 100 parts of the dialdehyde and then drying the web at a temperature sufficient to cure the glyoxal and polyol. The concentration of dialdehyde and polyol in the solution is sufficient to provide a combined total of from about 0.1 to about 10 weight percent dialdehyde and polyol in the web based on the oven-dry weight of the paper. The solution is preferably applied in a papermaking process at or after the wet press and prior to treating the web with chemicals having free hydroxyl groups which may react with the dialdehyde.
    Type: Grant
    Filed: April 28, 1997
    Date of Patent: June 29, 1999
    Assignee: International Paper Company
    Inventors: Benjamin Frank, Georgios D. Karles
  • Patent number: 5916420
    Abstract: The present invention relates to a thin printing paper with a weight per unit area in the range below 49 g/m.sup.2 and which contains wood and which is provided with surface pigmentation and which incorporates a mixture of a swellable coating silicate (sodium bentonite) and, for the remainder, conventional coating pigments as the pigment and which, in addition, contains only bonding agent that is a natural organic bonding agent, essentially starch. Even if only lightly calendered, the paper is equally well suited for rotogravure printing and for rotary offset printing. It is preferred that the paper also contain a proportion of processed fibres obtained from old-paper.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: June 29, 1999
    Assignee: Haindl Papier GmbH
    Inventors: Hartmut Wurster, Hans-Peter Hofmann
  • Patent number: 5911855
    Abstract: A printing material for ink-jet printing methods has a support and a dye-receiving coating, and an upper coating which includes finely divided particles of an inorganic pigment and/or filler exhibiting cationic charge centers is disposed on the dye-receiving coating.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: June 15, 1999
    Assignee: Felix Schoeller jr. Foto-und Spezialpapeire GmbH & Co. KG
    Inventors: Gerhard Dransmann, Claudia Junger, Horst Westfal
  • Patent number: 5904810
    Abstract: The invention relates to tissue products having improved softness properties and methods of making them. Specifically, improved softness is achieved by incorporating a cationic amidoamine into the fiber furnish at the wet end of the tissue machine prior to formation and/or by topical addition to the tissue web. One or more softeners/debonders can be added to the furnish and/or topically applied to the tissue web after the tissue web is dried. The result is a tissue product with added bulk and a smooth surface feel, both properties contributing to improved softness characteristics.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: May 18, 1999
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Wen Zyo Schroeder, Gary Lee Shanklin
  • Patent number: 5902453
    Abstract: A printing paper is provided having the appearance of uncoated paper and improved printability properties approaching those of coated papers. Also provided are a surface treatment formulation having a variable viscosity and a method for producing a printing paper having the appearance of uncoated paper and improved printability properties approaching those of coated papers.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: May 11, 1999
    Assignee: Mohawk Paper Mills, Inc.
    Inventor: Thomas D. Ruch
  • Patent number: 5900115
    Abstract: Provided are an ink jet recording paper which is provided with a recording layer having a coverage rate of from 0.1 to 10 g/m.sup.2 on at least one side of a base paper and has a basis weight of from 50 to 100 g/m.sup.2, with the recording paper having an irreversible shrinkage factor of from -0.05% to 0.10% in the CD direction when it is put under an environment that the relative humidity thereof is raised to 95% from 35% and then lowered to 35% and further showing a shrinking rate of from 0.15% to 0.25% in the CD direction by the change in relative humidity of the environment from 75% to 60% during the process of lowering the relative humidity from 90% to 35%.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: May 4, 1999
    Assignee: Nippon Paper Industries, Co., Ltd.
    Inventors: Yoshihiro Kuroyama, Teiichi Ohtani, Yukio Kobayashy, Yoichi Yamazaki, Yasunori Nanri
  • Patent number: 5888367
    Abstract: The present invention provides a record sheet used in an electro-coagulation printing method for forming characters and images on a cylinder as an electrode with an ink which coagulates with electric charge and for transferring the characters and images to the record sheet, wherein the wet time is 15 milliseconds or less, obtained from the absorption curve of pure water measured by a dynamic scanning absorptometer. Preferably, the record sheet has 5 ml/m.sup.2 s.sup.-1/2 or more absorption coefficient, and more preferably, has contact ratio measured by a specular reflection smoothness tester under a pressure of 40 kg/cm.sup.2 with a ray having a wavelength of 0.5 .mu.m is 40% or more. The record sheet can be used for various print sheets, in particular, for business form sheets and newspaper sheets.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: March 30, 1999
    Assignee: Tokushu Paper Mfg. Co., Ltd.
    Inventors: Toyohisa Mouri, Toshio Takagi, Shigeki Matsunaga, Yutaka Hattori
  • Patent number: 5885697
    Abstract: A soft tissue product is disclosed having uniformly distributed surface deposits of a solidified composition having a melting point of from about 30.degree. C. to about 70.degree. C. The solidified composition is applied to the outer surfaces of the tissue product in melted form, preferably by rotogravure printing. The solidified composition contains an oil, a wax, and preferably a fatty alcohol.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: March 23, 1999
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Duane Gerard Krzysik, Lee Patrick Garvey, Cynthia Watts Henderson, Michael Chauncey Tuck
  • Patent number: 5882478
    Abstract: The softness of tissue products, such as facial and bath tissue, is improved by the addition of a carboxylic acid ester. The carboxylic acid ester can be incorporated into the tissue by addition of the ester to the furnish prior to the formation of the tissue, or it can be topically applied to the tissue web after formation, either while the tissue web is still wet or after the tissue web has been dried.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: March 16, 1999
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventor: Wen Zyo Schroeder
  • Patent number: 5879512
    Abstract: A method of producing a composition for coating fibrous sheet products includes adding a surface treatment agent in an aqueous emulsion or solution form to an aqueous suspension of a dispersed inorganic particulate material comprising kaolin to improve the coating composition, e.g., rheology, and the rotogravure printing process, e.g. runnability. The dispersing agent is polycarboxylate. The surface treatment agent is in a substantially free state, has a hydrophobic group, and is selected from the group consisting of: (i) a long chain fatty acid; (ii) a long chain fatty alcohol; or (iii) an anionic surfactant having a long chain hydrophobic group and a polar group. A hydrophilic adhesive is added to the dispersed aqueous suspension during or while the surface treatment agent is added to the dispersed aqueous suspension. This method is used to produce a coated and a printed coated cellulosic sheet member.
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: March 9, 1999
    Assignee: ECC Internatinal Ltd.
    Inventors: Philip Martin McGenity, Janet Susan Preston
  • Patent number: 5876562
    Abstract: An aqueous anionic sizing dispersion which comprises an anionic dispersion of a cellulose-reactive sizing agent and colloidal anionic aluminum modified silica-based particles. The dispersion is used in the production of paper, board or cardboard whereby the dispersion is either added to the stock or applied as a surface size.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: March 2, 1999
    Assignee: Eka Chemicals AB
    Inventor: Hans Johansson
  • Patent number: 5873978
    Abstract: Provided is a recording paper having a feeling of plain paper suitable for ink jet recording with water-base ink, with the recording paper having in both machine and cross directions an irreversible shrinkage factor of from -0.10% to +0.10% when it is put under an environment that the relative humidity thereof is changed from 35% to 90% and further changed to 35%.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: February 23, 1999
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Yoshihiro Kuroyama, Yoichi Yamazaki, Yasunori Nanri
  • Patent number: 5868902
    Abstract: The present invention relates to a method for producing security paper which includes a security feature. The method comprises forming paper in a wet state, which paper incorporates on or more security features, applying to the paper a sizing agent, thereafter applying to one or both sides of the sized paper a coating comprising an unpigmented polyurethane. The unpigmented polyurethane may optionally comprise a functional additive provided that the presence of the functional additive does not increase the opacity of the paper by more than 1%. After the polyurethane has been applied the paper is dried. The coating composition provides a film, when cast on a glass surface, having a Konig hardness of from 15 to 130 seconds.
    Type: Grant
    Filed: September 10, 1997
    Date of Patent: February 9, 1999
    Assignee: Portals Limited
    Inventors: Paul Howland, Jonathan Paul Foulkes
  • Patent number: 5865953
    Abstract: Making paper for corrugating medium includes forming a sheet of pulp material, partially drying the sheet of pulp material to provide a partially dried sheet, applying a crack-reducing agent to surfaces of the partially dried sheet, and providing a sheet of paper by drying the partially dried sheet after applying the crack-reducing agent. Forming a sheet of pulp material may include providing a pulp slurry to a headbox having a slice and carrying the pulp slurry that exits from the slice away from the headbox using, for example, a Fourdrinier. The Fourdrinier may also dry the sheet.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: February 2, 1999
    Assignee: Merrimac Paper Company, Inc.
    Inventors: Mark A. Rottger, Mark R. Leonard
  • Patent number: 5853539
    Abstract: Dry strength additives used to enhance the properties of creped tissues are applied to the surface of the Yankee dryer along with the creping adhesive formulation and thereafter transferred to the tissue web as the tissue web is being adhered to the Yankee. When dry strength agents are applied in this manner, less dust and lint are accumulated resulting in improved productivity and product quality.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: December 29, 1998
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Michael John Smith, Stephen John McCullough
  • Patent number: 5853900
    Abstract: Paper coating slips contain an emulsion copolymer, comprising overallfrom 0 to 60% by weight of a vinylaromatic,from 40 to 95% by weight of a C.sub.1 -C.sub.10 -alkyl (meth)acrylate,from 5 to 40% by weight of an alkenylnitrile,from 0 to 10% by weight of an ethylenically unsaturated acid andfrom 0 to 20% by weight of further monomersas a binder, wherein the emulsion copolymer is a mixture of at least two polymers or an emulsion copolymer comprising at least two stages, one polymer or one stage whose content in the emulsion copolymer is from 10 to 75% by weight containing at least 90% by weight of the total amount of alkenylnitrile (alkenylnitrile-rich polymer or stage).
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: December 29, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernhard Schuler, Elmar Schwarzenbach, Jurgen Hartmann, Chung-Ji Tschang
  • Patent number: 5853540
    Abstract: Water-resistant recording material for the inkjet process using water-based inks, having a substrate paper which, in addition to cellulosic fibres, contains 1-40% fibres and on one side or both sides of which a water-resistant recording layer is arranged. After storage for 24 hours at 23.degree. C. in water, the recording material has over 80% of the tear strength of the dry paper, measured according to DIN 53128. Even after the storage in water, the color difference .DELTA.E, measured according to DIN 6174, of colored areas of the primary colors applied in the inkjet process is less than 10, based on the initial color values.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: December 29, 1998
    Assignee: SIHL GmbH
    Inventors: Axel Niemoller, Klaus Gotzen, Manuel Gold
  • Patent number: 5851654
    Abstract: Disclosed herein is a recording medium comprising an alumina hydrate having an average pore radius of 20 to 200 .ANG. and a half breadth of pore radius distribution of 20 to 150 .ANG..
    Type: Grant
    Filed: January 14, 1997
    Date of Patent: December 22, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hitoshi Yoshino, Kyo Miura, Yuji Kondo
  • Patent number: 5849153
    Abstract: A water-dispersible sheet and a cigarette using the sheet are disclosed. The sheet comprises a water-resolvable base paper made from fibrous raw materials and a water-dispersible coating layer containing water-soluble polymer and an alkaline compound. The sheet is also produced through an impregnation treatment for a water-resolvable base paper with a coating mixture containing water-soluble polymer and an alkaline compound, wherein said water-resolvable base paper is made from a mixture of water-dispersible fibers and fibrous carboxymethyl cellulose acid or fibrous carboxyethyl cellulose acid. The gas-permeability of the water-dispersible sheet is controlled by the water-dispersible coating layer or the impregnation treatment.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: December 15, 1998
    Assignees: Mishima Paper Co., Ltd., Japan Tobaco Inc.
    Inventors: Yoshiaki Ishino, Masato Shishikura, Toru Tsujimoto, Susumu Minamisawa
  • Patent number: 5849154
    Abstract: A printing paper, especially a newsprint base paper, comprising a base paper, suitably lightweight acid base paper, and a coating layer for improving surface strength of the coated paper and releasing-property when two sheets of the coated paper are stacked, which coating layer is formed on the base paper by using a coating-transcription system such as a gate-roll coating system, which coating layer comprises low-molecular anionic polyacrylamide in a coating weight of from 0.01 g/m.sup.2 to 0.2 g/m.sup.2, wherein the anionic polyacrylamide have a weight average molecular weight ranging from 10,000 to 150,000, thereby improving not only surface strength but also releasing-property in a printing paper, especially in a newsprint paper having a basis weight less than 46 g/m.sup.2.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: December 15, 1998
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Toshiyuki Takano, Motoi Fukuda, Toshimi Satake
  • Patent number: 5846382
    Abstract: The invention relates to the addition of sulfonated zinc, manganese, or aluminum phthalocyanines to inorganic fillers and pigments for enhancing their whiteness, brightness and chromaticity, as well as to the fillers and pigments and mixtures thereof so obtained, and to the use thereof in e.g. paper manufacture.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: December 8, 1998
    Assignee: Jorax GmbH
    Inventor: Axel von Raven
  • Patent number: 5846381
    Abstract: Papers which are coated with a paper coating slip based on a binder containingA) from 1 to 49% by weight of polymers based on esters of acrylic acid or of methacrylic acid with a C.sub.4 -C.sub.12 -alkanol, having a glass transition temperature of from -80.degree. to +25.degree. C., andB) from 51 to 99% by weight of polymers based on butadiene, the stated weights being based on the sum A)+B), are used for offset printing.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: December 8, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Thomas Wirth, Harald Nissler, Berthold Sturm, Dirk Lawrenz, Bernhard Schuler
  • Patent number: 5843566
    Abstract: A laminated transparent paper is disclosed therein which is obtained by laminating transparent papers on both the surfaces of a transparent polyester film via an adhesive, the surfaces of the transparent papers having coating layers of a coating solution mainly comprising an aqueous dispersion of at least one selected from the group consisting of an acrylonitrile-vinylformal-acrylic acid ester copolymer, a styrene-acrylic acid copolymer and a styrene-methacrylic acid copolymer, the laminated transparent paper having a Bekk smoothness of 20 seconds or more and an opacity of 45% or less.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: December 1, 1998
    Assignee: Mitsubishi Paper Mills Limited
    Inventors: Masahiro Miyauchi, Yukihiro Tachifuji
  • Patent number: 5824190
    Abstract: Compositions containing hydrophilic polyacrylamide and hydrophobic surface size agents and the methods for using such compositions in paper and board to improve printability, sizing and strength are provided in the instant invention.
    Type: Grant
    Filed: August 6, 1996
    Date of Patent: October 20, 1998
    Assignee: Cytec Technology Corp.
    Inventors: Gerald Guerro, David Dauplaise, Rajiv Bazaj
  • Patent number: 5824191
    Abstract: The present invention provides a process for making a paper based product which comprises a paper sheet, an aqueous latex binder and a release agent comprised of an emulsion of lecithin and a fatty acid or derivative thereof. In one embodiment, the process comprises first preparing a slurry of a cellulosic pulp and a polymeric latex binder, and then breaking the stability of the latex so that the polymer particles of the latex are able to be deposited on the fibers of the cellulosic pulp. An emulsion comprised of lecithin and a fatty acid or derivative thereof is added during the process. The addition can be to the slurry, or to the web which is formed when the slurry is drained of liquid. The web is then dried to provide the paper based product. In a preferred embodiment, a slurry of cellulosic pulp is first drained of liquid to form a web, with the polymeric latex binder and emulsion being applied to the web prior to drying.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: October 20, 1998
    Assignee: FiberMark Filter & Technical Products, Inc.
    Inventor: Homan B. Kinsley, Jr.
  • Patent number: 5820998
    Abstract: A process of making a coated paper comprises the following steps: 1) providing a paper layer composed of a blend of pulp fibers and particulate material containing polyvalent metal cations, 2) applying a acidified alginate solution of a material selected from salts and derivatives of alginic acid to cover at least a portion of the paper, 3) reacting the salts and/or derivatives of alginic acid with polyvalent metal cations in the paper to form a polymer coating, and 4) drying the paper and polymer coating. The permeability of the coated paper is generally at least about 75 percent less than the permeability of an identical uncoated portion of the paper. The solution of alginate material may be partially cross-linked. The alginate solution may be deposited utilizing gravure printing techniques. Also disclosed is a coated paper and a wrapper for a smoking article.
    Type: Grant
    Filed: March 8, 1994
    Date of Patent: October 13, 1998
    Assignee: Schweitzer-Mauduit International, Inc.
    Inventors: Raymond Dwayne Hotaling, Vladimir Hampl, Jr.
  • Patent number: 5814188
    Abstract: Strong, soft, and low dusting tissue paper webs useful in the manufacture of soft, absorbent sanitary products such as bath tissue, facial tissue, and absorbent towels are disclosed. At least one surface of the tissue papers has uniform discrete surface deposits of a substantively affixed chemical softening agent.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: September 29, 1998
    Assignee: The Procter & Gamble Company
    Inventors: Kenneth Douglas Vinson, Paul Thomas Weisman, Jonathan Andrew Ficke, Thomas James Klofta
  • Patent number: 5810970
    Abstract: A method for making a collagen strengthened cellulosic sheet by providing a cellulosic pulp slurry; adding solubilized collagen to the pulp slurry, and mixing for a time effective for interaction of the cellulosic pulp slurry and solubilized collagen; forming the interacted cellulosic pulp slurry and solubilized collagen into a sheet; and drying the sheet; also, a method for using solubilized collagen for strengthening paper by mixing the solubilized collagen with a cellulosic pulp slurry; and making a cellulosic pulp product from the mixture and drying.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 22, 1998
    Assignee: Ranpak Corporation
    Inventors: Kenneth E. Hughes, David C. Masterson, David J. Fink, Barbara A. Metz, Gordon E. Pickett, Paul M. Gemmer