Patents by Inventor Friedrich Linhart

Friedrich Linhart has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8133543
    Abstract: A process for improving the printability of paper and paper products by enhancing the water resistance of ink-jet printed images, wherein the process comprises treating the paper or paper products with aqueous solutions of cationic polymers comprising vinylamine units and having a charge density of at least 3 meq/g as the sole treatment composition in aqueous solution, wherein the sole treatment composition is applied in an amount from 0.05 to 5 g/m2 to the surface of the paper or the surface of the paper product.
    Type: Grant
    Filed: April 20, 2004
    Date of Patent: March 13, 2012
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Rudi Mulder, Andreas Hopf, Klaus Bohlmann
  • Patent number: 7641765
    Abstract: Paper coated with a coating slip containing at least one optical brightener is produced by a process in which base paper or precoated paper is treated, before application of the coating slip containing optical brightener, with at least one substance which enhances the efficiency of optical brighteners.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: January 5, 2010
    Assignee: BASF Aktiengesellschaft
    Inventors: Thierry Blum, Friedrich Linhart, Stephan Frenzel
  • Patent number: 7604713
    Abstract: The process for the production of crepe paper by adhesive bonding of a paper web with the aid of an adhesive comprising (i) polyethyleneimine having a molar mass Mw of from 50 000 to 2 million, (ii) reaction products of polyethyleneimine having a molar mass Mw of from 500 to 1 million with at least one C14- to C22-alkyldiketene, a monocarboxylic acid, an ester of a monocarboxylic acid or an acid chloride of a monocarboxylic acid and/or (iii) reaction products of polyalkylenepolyamines having a molar mass of from 300 to 1 million with at least one bischlorohydrogen ether or bisglycidyl ether of a polyalkylene glycol having a molecular weight MN of from 300 to 3000 to a creping cylinder, compression and removal of the crepe paper, as well as the use of the adhesives (i) to (iii) as creping assistants.
    Type: Grant
    Filed: May 19, 2005
    Date of Patent: October 20, 2009
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Anton Esser, Detlef Kannengiesser
  • Publication number: 20090145565
    Abstract: A process for the production of crepe paper by adhesive bonding of a paper web with the aid of an organic synthetic polymer or mixtures comprising said polymer to a creping cylinder, compression and removal of the crepe paper from the creping cylinder, the organic synthetic polymer used being at least one polymer comprising vinylamine units.
    Type: Application
    Filed: October 20, 2005
    Publication date: June 11, 2009
    Applicant: BASF Aktiengesellschaft
    Inventors: Anton Esser, Friedrich Linhart
  • Publication number: 20070204965
    Abstract: The process for the production of crepe paper by adhesive bonding of a paper web with the aid of an adhesive comprising (i) polyethyleneimine having a molar mass Mw of from 50 000 to 2 million, (ii) reaction products of polyethyleneimine having a molar mass Mw of from 500 to 1 million with at least one C14- to C22-alkyldiketene, a monocarboxylic acid, an ester of a monocarboxylic acid or an acid chloride of a monocarboxylic acid and/or (iii) reaction products of polyalkylenepolyamines having a molar mass of from 300 to 1 million with at least one bischlorohydrogen ether or bisglycidyl ether of a polyalkylene glycol having a molecular weight MN of from 300 to 3000 to a creping cylinder, compression and removal of the crepe paper, as well as the use of the adhesives (i) to (iii) as creping assistants.
    Type: Application
    Filed: August 19, 2005
    Publication date: September 6, 2007
    Inventors: Friedrich Linhart, Anton Esser, Detlef Kannengiesser
  • Publication number: 20070014940
    Abstract: Method for improving the printability of paper and paper products when printing with the aid of the ink-jet printing method by treating the paper or the paper products with aqueous solutions of cationic polymers having a charge density of at least 3 meq/g as the sole treatment composition in aqueous solution, the cationic polymer being applied in an amount of from 0.05 to 5 g/m2 to the surface of the paper or of the paper products, and said cationic polymers are used for improving the ink-jet printability of paper and paper products.
    Type: Application
    Filed: April 20, 2004
    Publication date: January 18, 2007
    Applicant: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Rudi Mulder, Andreas Kasper, Klaus Bohlmann
  • Patent number: 6969444
    Abstract: Paper coating slips whose additives comprise addition polymers or copolymers containing N-vinylformamide in (co)polymerized form, and their use.
    Type: Grant
    Filed: November 2, 2001
    Date of Patent: November 29, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Bernd Dirks, Heinrich Ullrich, Thierry Blum, Norbert Mahr, Stefan Frenzel, Martin Wendker
  • Publication number: 20050061461
    Abstract: Paper, board and cardboard are produced by draining a paper stock in the presence of at least one cationic polymer on a wire by a process in which a mixture of at least one substantially linear, cationic polyelectrolyte and an optical brightener is added to the paper stock before sheet formation, said mixture containing at least two parts by weight of the polyelectrolyte per part by weight of the optical brightener.
    Type: Application
    Filed: December 6, 2002
    Publication date: March 24, 2005
    Inventors: Friedrich Linhart, Thierry Blum, Ralf Hemel, Klaus Bohlmann
  • Publication number: 20040238791
    Abstract: Pigment-free mixtures, containing a) at least one optical brightener and b) at least one (co)polymer, with at least one N-vinylcarboxamide incorporated in the polymer and/or at least one nitrogen-containing heterocyclic ring and/or which may form a nitrogen-containing heterocyclic ring.
    Type: Application
    Filed: February 26, 2004
    Publication date: December 2, 2004
    Inventors: Simon Champ, Friedrich Linhart, Hans-Peter Kaub, Thierry Blum, Simon Nord
  • Publication number: 20040182533
    Abstract: Recording materials are produced by a process in which a mixture A comprising
    Type: Application
    Filed: February 13, 2004
    Publication date: September 23, 2004
    Inventors: Thierry Blum, Friedrich Linhart, Hans-Peter Kaub, Simon Champ, Martin Wendker, Dieter Meck, Steffen Geiger
  • Publication number: 20040154764
    Abstract: Paper coated with a coating slip containing at least one optical brightener is produced by a process in which base paper or precoated paper is treated, before application of the coating slip containing optical brightener, with at least one substance which enhances the efficiency of optical brighteners.
    Type: Application
    Filed: February 9, 2004
    Publication date: August 12, 2004
    Inventors: Thierry Blum, Friedrich Linhart, Stefan Frenzel
  • Publication number: 20040020615
    Abstract: Paper coating slips whose additives comprise addition polymers or copolymers containing N-vinylformamide in (co)polymerized form, and their use.
    Type: Application
    Filed: May 2, 2003
    Publication date: February 5, 2004
    Inventors: Friedrich Linhart, Bernd Dirks, Heinrich Ullrich, Thierry Blum, Norbert Mahr, Stefan Franzel, Martin Wendker
  • Patent number: 6673206
    Abstract: Paper, board and cardboard are produced by a process in which a paper stock is drained in the presence of condensates of basic amino acids with sheet formation. In particular, homo- and cocondensates of lysine and the crosslinked condensates obtainable therefrom by reaction with crosslinking agents are used in amounts of from 0.01 to 5% by weight, based on dry paper stock, as a means of increasing the dry and wet strength and the absorptivity of paper, for fixing anionic dyes and interfering substances in the paper, for increasing the drainage rate and the retention as well as the efficiency of synthetic anionic and cationic retention aids in the production of paper, board and cardboard by draining a paper stock with sheet formation.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: January 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Bernd Dirks, Rainer Tresch, Bernhard Mohr, Dietrich Fehringer
  • Patent number: 6303002
    Abstract: Paper, board and cardboard are produced from paper stocks which contain tacky impurities by the addition of surfactants and cationic polymers having a charge density of at least 1.5 meq/g (measured at pH 7) and a molar mass Mw of the cationic polymers of at least 15,000 and drainage of the paper stocks with fixation of the tacky impurities in the paper produced.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: October 16, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Jaroslav Melzer, Hubert Meixner
  • Patent number: 6190503
    Abstract: Wastewaters and circulation waters in papermaking, in deinking and in pulp bleaching are treated by adsorption of water-soluble anionic compounds and compounds dispersed in water from the wastewaters and circulation waters over finely divided adsorbents which consist of insoluble, only slightly swellable polymers which contain polymerized vinylamine units, and these polymers are used as adsorbents for treating water circulations in papermaking and for treating paper machine wastewaters and wastewaters from the deinking process and from pulp bleaching.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: February 20, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Manfred Niessner, Martin Rübenacker, Claudia Nilz
  • Patent number: 6132558
    Abstract: Paper and cardboard are produced by draining pulps, with sheet formation and drying of the sheets, by a process in which first(a) polyethyleneimines having a molar mass M.sub.w of more than 500,000 or polymers containing vinylamine units and having a molar mass of from 5000 to 3 million and then(b) cationic polyacrylamides or polymers containing vinylamine units, the molar masses M.sub.w of the polymers each being at least 4 million,are added to the pulps, and the pulp is then subjected to at least one shearing stage and is flocculated by adding bentonite, colloidal silica or clay.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: October 17, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Rainer Dyllick-Brenzinger, Hubert Meixner, Friedrich Linhart, Dietmar Monch, Klaus-Dieter Gerber, Bernd Dirks, Peter Baumann
  • Patent number: 5851300
    Abstract: In a cationic modification process for starch, starch is reacted with polymers that contain amino and/or ammonium groups in an aqueous medium at temperatures from 115.degree. C. to 180.degree. C. under an increased pressure and in the absence of oxidizers, polymerization initiators and alkali. The reaction is conducted so that maximum 10% by weight starch has its molar weight reduced. Also disclosed is the use of the thus obtained reaction products as dry strength agents for paper.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: December 22, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Andreas Stange, Rudolf Schuhmacher, Heinrich Hartmann, Walter Denzinger, Manfred Niessner, Claudia Nilz, Wolfgang Reuther, Hubert Meixner
  • Patent number: 5744001
    Abstract: Aqueous pigment slurries which contain up to 80% by weight of a finely divided pigment in dispersed form and from 0.1 to 5% by weight of dispersants which are obtainable by reacting(a) polyalkylenepolyamines, polyamidoamines, polyamidoamines grafted with ethyleneimine, polyetheramines and mixtures of the stated compounds and(b) monoethylenically unsaturated carboxylic acids, salts, esters, amides or nitriles of monoethylenically unsaturated carboxylic acids, chlorocarboxylic acids and/or glycidyl compounds and, if required,(c) bifunctional or polyfunctional crosslinking agents which have a halohydrin, glycidyl, aziridine or isocyanate unit or a halogen atom as a functional group,to give water-soluble condensates which, in 20% strength by weight aqueous solution at 20.degree. C., have a viscosity of at least 100 mPa.s are prepared by milling or dispersing pigments in the presence of the dispersants and water and are used as additives to paper stock in the production of filler-containing paper.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: April 28, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Dietmar Moench, Guenter Scherr, Wolfgang Reuther, Primoz Lorencak
  • Patent number: 5695610
    Abstract: Aqueous pigment slurries which contain up to 80% by weight of a finely divided pigment in dispersed form and from 0.1 to 5% by weight of a water-soluble reaction product of(a) a polyamidoamine grafted with ethyleneimine and(b) a bifunctional or polyfunctional crosslinking agents which have a halohydrin, glycidyl, aziridine or isocyanate unit or a halogen atom as a functional group,the reaction product, in 25% strength by weight aqueous solution at 20.degree. C., having a viscosity of at least 100 mPa.s, are used as an additive to the paper stock in the production of filler-containing paper.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: December 9, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Auhorn, Friedrich Linhart, Dietmar Monch, Jurgen Weiser, Primoz Lorencak
  • Patent number: 5641855
    Abstract: There are described water-soluble condensation products of amino-containing compounds and crosslinkers, obtainable by reacting(a) polyalkylenepolyamines, polyamidoamines, ethylene-imine-grafted polyamidoamines, polyetheramines and mixtures thereof, with(b) monethylenically unsaturated carboxylic acids, salts, esters, amides or nitriles of monoethylenically unsaturated carboxylic acids, chlorocarboxylic acids and/or glycidyl compounds such as glycidic acid, glycidamide or glycidyl esters, and(c) at least bifunctional crosslinkers having a halo-hydrin, glycidyl, aziridine or isocyanate unit or a halogen atom as functional group,to form water-soluble condensation products having a viscosity of at least 100 mPas in a 20% strength by weight aqueous solution at 20.degree. C., processes for preparing the water-soluble condensation products by reacting the abovementioned compounds of groups (a), (b) and (c), and the use of the condensation products as drainage, flocculation and retention aids in papermaking.
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: June 24, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Guenter Scherr, Wolfgang Reuther, Dietmar Moench, Friedrich Linhart, Juergen Weiser