Patents Assigned to Lenzing AG
  • Patent number: 11939405
    Abstract: The present invention relates to a method of pulping cotton-based raw material for producing dissolving pulp. More specifically, the invention relates to a process for producing dissolving pulp under alkaline conditions in combination with a gaseous oxidizing agent. The present invention further relates to dissolving pulp obtainable by pulping cotton-based raw material, in particular dissolving pulp obtainable by the method of the present invention, the use of such dissolving pulp for producing regenerated cellulose molded bodies, and methods of producing lyocell or viscose including such dissolving pulp.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: March 26, 2024
    Assignee: Lenzing AG
    Inventors: Stephan Silbermann, Christian Weilach
  • Patent number: 10577723
    Abstract: The invention relates to flame-retardant cellulosic man-made fibers containing a flame-retardant substance in the form of an oxidized condensate of a tetrakis hydroxyalkyl phosphonium salt with ammonia and/or a nitrogenous compound which contains one or several amine groups whereby the fiber has a tenacity of more than 18 cN/tex in a conditioned state. Production process and the use of the fibers according to the invention are further objects of the invention.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: March 3, 2020
    Assignee: Lenzing AG
    Inventors: Hartmut Rüf, Clemens Bisjak, Gert Kroner
  • Patent number: 9988743
    Abstract: The invention relates to flame-retardant cellulosic man-made fibers containing a flame-retardant substance in the form of an oxidized condensate of a tetrakis hydroxyalkyl phosphonium salt with ammonia and/or a nitrogenous compound which contains one or several amine groups whereby the fiber has a tenacity of more than 18 cN/tex in a conditioned state. Production process and the use of the fibers according to the invention are further objects of the invention.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: June 5, 2018
    Assignee: Lenzing AG
    Inventors: Hartmut Rüf, Clemens Bisjack, Gert Kroner
  • Patent number: 9822188
    Abstract: The present invention relates to a phase-stable suspension of cellulose II in water, having a high water retention capacity and a cellulose concentration between 0.1 and 5.0% by weight, a method of its preparation, and its use.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: November 21, 2017
    Assignee: Lenzing AG
    Inventors: Johann Männer, Martina Opietnik, Josef Innerlohinger, Gerhard Reiter, Markus Hager
  • Publication number: 20160177471
    Abstract: The present invention relates to a direct dissolving process for the production of polysaccharide fibers which contain ?(1?3)-glucan as a fiber-forming substance, with aqueous sodium hydroxide solution as a solvent, as well as to the fibers made thereby, and to their use.
    Type: Application
    Filed: June 13, 2014
    Publication date: June 23, 2016
    Applicant: Lenzing AG
    Inventors: Gregor Kraft, Gert Kroner, Thomas Röder, Heinrich Firgo
  • Publication number: 20160138217
    Abstract: The present invention relates to a regenerated cellulosic fiber which contains an incorporated dye pigment and a fluorescent dye applied by overdying, the use of this fiber for the production of yarns and fabrics and a process for the production of these fibers. This fiber satisfies the demands of EN 471 in relation to luminance factor, the chromaticity coordinates and color fastness and possesses a light fastness (ISO 105-B02, process 2) of more than 5.
    Type: Application
    Filed: January 20, 2016
    Publication date: May 19, 2016
    Applicant: Lenzing AG
    Inventors: Gabriele Emlinger, Ulf Mathes, Alexander Gstettner, Gert Kroner
  • Publication number: 20130149933
    Abstract: The present invention relates to a cellulosic regenerated fiber which contains an incorporated luminous pigment and an incorporated color pigment and the use of these for the production of yarns, textile fabrics and an article of reflective clothing and a process for the production of these fibers. This fiber satisfies the demands of standard EN 471, standard EN 1150, standard CAN/CSA, standard ANSI/ISEA and standard BS 471 with regard to light density, the color space and fastness values.
    Type: Application
    Filed: July 11, 2011
    Publication date: June 13, 2013
    Applicant: Lenzing AG
    Inventors: Ksenija Varga, Gert Kroner, Peter Wessely, Johann Männer
  • Publication number: 20120178856
    Abstract: The present invention relates to cellulose fibers with an enhanced metering capability, a process for the production of these and the use of these for the reinforcement of compound materials, in particular thermoplastic polymers.
    Type: Application
    Filed: July 27, 2010
    Publication date: July 12, 2012
    Applicant: Lenzing AG
    Inventors: Markus Gobl, Josef Innerlohinger, Friedrich Suchomel
  • Publication number: 20120177919
    Abstract: The present invention relates to a flame-retardant cellulosic regenerated fiber for textile applications which for example also satisfies the demands of industrial dry cleaning, its use for the production of yarns and fabrics and a process for the production of these fibers.
    Type: Application
    Filed: July 27, 2010
    Publication date: July 12, 2012
    Applicant: Lenzing AG
    Inventor: Gert Kroner
  • Publication number: 20110045728
    Abstract: The invention relates to blends of high wet modulus cellulosic fibers and solvent spun cellulosic fibers and yarns and fabrics made thereof.
    Type: Application
    Filed: December 22, 2008
    Publication date: February 24, 2011
    Applicant: Lenzing AG
    Inventors: Friedrich Weninger, Dieter Eichinger, Whilhelm Feilmair, Johann Leitner, Karin Kämpf
  • Publication number: 20110028608
    Abstract: The present invention relates to cellulosic particles, a suspension of cellulosic particles and a process for the production of a suspension of cellulosic particles, whereby the cellulosic material is never dried between the dissolution of the cellulose and the disintegration of the suspended cellulose fibers.
    Type: Application
    Filed: September 12, 2008
    Publication date: February 3, 2011
    Applicant: Lenzing AG
    Inventors: Josef Innerlohinger, Heinrich Firgo, Helmut Schkorwaga
  • Publication number: 20110009259
    Abstract: The invention relates to a process for producing spherical, non-fibrillar cellulose particles with a particle size in the range of from about 1 ?m to about 400 ?m from a solution of cellulose in which the solution is cooled down to below its solidification temperature wherein it is flowing freely, the solvent is washed out, the solidified cellulose solution is disintegrated to form cellulose powder comprising particles, and the disintegrated and washed out particles are dried. The invention also relates to the cellulose powder and particles made in accordance with the process of the invention.
    Type: Application
    Filed: September 12, 2008
    Publication date: January 13, 2011
    Applicant: Lenzing AG
    Inventors: Josef Innerlohinger, Gregor Kraft, Hedda Weber, Haio Harms
  • Publication number: 20100330351
    Abstract: The invention relates to yarns and fabrics containing nylon staple fiber and high-tenacity man-made cellulosic staple fiber, and garments made therefrom, and has particular reference to fabrics having a high resistance to wear whilst retaining a high comfort level.
    Type: Application
    Filed: December 10, 2008
    Publication date: December 30, 2010
    Applicant: Lenzing AG
    Inventors: Marina Crnoja-Cosic, James Martin Taylor
  • Publication number: 20100291823
    Abstract: The present invention relates to a high-tenacity cellulosic regenerated fiber with an individual fiber titer of between 0.6 and 0.9 dtex and yarns and planar textile structures which contain regenerated fibers of this kind.
    Type: Application
    Filed: December 5, 2008
    Publication date: November 18, 2010
    Applicant: Lenzing AG
    Inventors: Johann Leitner, Gert Kroner, Egon Dünser, Karin Kämpf, Harald Schobesberger, Ronald Möslinger
  • Patent number: 7326376
    Abstract: A method of regulating the composition of the cellulose-containing extrusion solution in the production of cellulosic molded articles, whereby (a) cellulose is mixed with an aqueous amine oxide solution; (b) the mixture is converted to the extrusion solution by evaporation of water in vacuo at an elevated temperature and by input of shearing energy; (c) the extrusion solution is extruded, forming the cellulosic molded article, and is coagulated in a coagulation bath, and (d) the resulting molded article is washed to remove the residual amine oxide, characterized in that in step (a) the cellulose/amine oxide ratio is kept at a predetermined level by preregulation, and the water content of the extrusion solution is kept at a predetermined level by a main regulation after leaving step (b). This method allows accurate regulation of the composition of the solution.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: February 5, 2008
    Assignee: Lenzing AG
    Inventors: Uwe Kind, Leo Kagalowski, Marco Blech
  • Patent number: 5284540
    Abstract: An unstretched first plastic foil is laminated with a longitudinally stretched second plastic foil by the application of heat and pressure. The second foil is preheated, thereupon stretched and thereafter tempered prior to being laminated with the first foil which is heated prior to lamination. The laminating step can coincide with the tempering step and immediately follows the stretching step so that the laminating step can be carried out by utilizing heat which is required for stretching of the second foil. The material of the first foil is or can be identical with the material of the second foil; in any event, the two materials are sufficiently compatible to permit bonding of the unstretched foil to the stretched foil by the application of heat and pressure alone, i.e., without resorting to an adhesive.
    Type: Grant
    Filed: January 9, 1991
    Date of Patent: February 8, 1994
    Assignees: Spohn Verpackungswerke GmbH & Co., Lenzing AG, Spohn Verpackungswerke GmbH & Co.
    Inventors: Roland Roth, Henning Schick, Johann Bloo, Franz Zacek
  • Patent number: 5120814
    Abstract: To produce flame-retardant thermostable new homopolyimides having structural units of the general formula ##STR1## by reacting 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride with an overall equimolar amount of 2,4- and/or 2,6-toluene diisocyanate, the reaction is carried out in the presence of a polymerization accelerator. The new homopolyimides have a glass transition point of at least 320.degree. C. and are processible to moulded articles exhibiting a similarly good structural strength as could hitherto be observed in mixed polyimides only. Furthermore, the new homopolyimides can be spun to fibres.
    Type: Grant
    Filed: January 31, 1990
    Date of Patent: June 9, 1992
    Assignee: Lenzing AG
    Inventors: Sigrid Seidl, Klaus Weinrotter, Herbert Griesser
  • Patent number: 5116673
    Abstract: A high-temperature resistant stacking support is composed of a, preferably self-supporting, core which at least partially is surrounded by a high-temperature resistant fiber composite made of polyimide fibers of the general formula ##STR1## wherein n is an integer larger than 1 and A represents a four-valent aromatic group.The stacking support can be produced by shrinking a polyimide fiber nonwoven consisting of polyimide fibers of the general formula (I) onto the core under heat exposure.These stacking supports are particularly useful for stacking heated aluminum sections.
    Type: Grant
    Filed: March 23, 1990
    Date of Patent: May 26, 1992
    Assignee: Lenzing AG
    Inventors: Robert Vodiunig, Gerhard Reiter, Klaus Weinrotter
  • Patent number: 5094877
    Abstract: Surfaces are coated by flame spraying onto the surfaces a powder mixture including a high-temperature resistant plastic and a metal, the high-temperature resistant plastic being a polyimide having a glass transition point of above 250.degree. C. and containing low-molecular emittable components in an amount of at least 1.0% by weight, preferably of between 1.0 and 10% by weight.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: March 10, 1992
    Assignee: Lenzing AG
    Inventors: Heimo Bieringer, Manfred Schobesberger, Klaus Weinrotter
  • Patent number: 4727864
    Abstract: A protective sleeve, particularly for human arms and legs, uses a sack-like synthetic material film with a slip-in opening. A preferably adhesive, band-shaped sealing strip is fastened at the rim of the slip-in opening over a part of its circumference and projects over the rim of the film. The strip forms a freely projecting member of such length and such surface that the ends of the sealing strip, after enclosing a body part to be covered, overlap, one adhering on the other.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: March 1, 1988
    Assignees: IIIe GmbH, Chemie Lenz AG
    Inventors: Peter Wiesenthal, Beatus Ille