Patents Assigned to Lenzing AG
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Patent number: 11939405Abstract: 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: GrantFiled: December 22, 2017Date of Patent: March 26, 2024Assignee: Lenzing AGInventors: Stephan Silbermann, Christian Weilach
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Patent number: 11767623Abstract: This invention relates to a process and a device for manufacturing cellulose-based webs which are directly formed from lyocell spinning solution and in particular for the washing of directly formed cellulose webs.Type: GrantFiled: May 27, 2022Date of Patent: September 26, 2023Assignee: LENZING AGInventors: Mirko Einzmann, Malcolm Hayhurst, Ibrahim Sagerer-Foric
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Patent number: 11613097Abstract: This invention relates to a nonwoven material consisting of one or more layers of nonwoven webs of essentially continuous cellulosic filaments, characterized in that within each layer each of the three bonding mechanisms: a) hydrogen bonding, b) filament intermingling and c) merged filament bonding occur for bonding the essentially continuous cellulosic filaments. Further it relates to a process for the manufacture and to various uses of this material.Type: GrantFiled: April 3, 2017Date of Patent: March 28, 2023Assignee: LENZING AGInventors: Tom Carlyle, Mirko Einzmann, Gisela Goldhalm, Malcolm John Hayhurst, Katharina Mayer, Ibrahim Sagerer-Foric
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Patent number: 11371173Abstract: This invention relates to a process and a device for manufacturing cellulose-based webs which are directly formed from lyocell spinning solution and in particular for the washing of directly formed cellulose webs.Type: GrantFiled: October 18, 2017Date of Patent: June 28, 2022Assignee: LENZING AGInventors: Mirko Einzmann, Malcolm Hayhurst, Ibrahim Sagerer-Foric
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Patent number: 10577723Abstract: 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: GrantFiled: October 10, 2013Date of Patent: March 3, 2020Assignee: Lenzing AGInventors: Hartmut Rüf, Clemens Bisjak, Gert Kroner
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Patent number: 9988743Abstract: 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: GrantFiled: December 9, 2011Date of Patent: June 5, 2018Assignee: Lenzing AGInventors: Hartmut Rüf, Clemens Bisjack, Gert Kroner
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Patent number: 9822188Abstract: 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: GrantFiled: November 14, 2014Date of Patent: November 21, 2017Assignee: Lenzing AGInventors: Johann Männer, Martina Opietnik, Josef Innerlohinger, Gerhard Reiter, Markus Hager
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Publication number: 20170284023Abstract: A process for pretreating reclaimed cotton fibers to be used in the production of molded bodies from regenerated cellulose characterized by effective metal redaction and adjustment of the degree of polymerization and brightness, including a metal removing stage and an oxidative bleaching stage of the reclaimed cotton fibers or pulp produced thereof. Reclaimed cotton fibers treated according to the described process may be used alone or in blends with conventional dissolving pulp as raw material for the production of molded bodies from regenerated cellulose. The process enables technically smooth, safe, and economically feasible spinning via the Viscose or Lyocell process, therefore, the current invention provides an efficient recycling pathway for cotton waste materials.Type: ApplicationFiled: November 18, 2014Publication date: October 5, 2017Applicant: LENZING AGInventors: Christian Weilach, Susanne Möderl, Christian Sperger, Andrea Borgards
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Publication number: 20170283512Abstract: 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: ApplicationFiled: November 14, 2014Publication date: October 5, 2017Applicant: LENZING AGInventors: Johann Männer, Martina Opietnik, Josef Innerlohinger, Gerhard Reiter, Markus Hager
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Publication number: 20170241079Abstract: The present invention relates to fibrillated lyocell fibers which have a fibrillation ratio Q of 20 or more and whose content of microfibers with a fineness of less than 14 mesh and a diameter of less than 2 ?m is at least 50%, as well as the use thereof for producing a wipe, which contains cellulosic fibers and 5 to 20 wt. % of fibrillated lyocell fibers.Type: ApplicationFiled: May 29, 2015Publication date: August 24, 2017Applicant: LENZING AGInventors: Johann Männer, Rudolf Aigner, Jim Gannon, Matt Riley
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Publication number: 20160237619Abstract: A process for pretreating reclaimed cotton fibers to be used in the production of molded bodies from regenerated cellulose characterized by effective metal redaction and adjustment of the degree of polymerization and brightness, including a metal removing stage and an oxidative bleaching stage of the reclaimed cotton fibers or pulp produced thereof. Reclaimed cotton fibers treated according to the described process may be used alone or in blends with conventional dissolving pulp as raw material for the production of molded bodies from regenerated cellulose. The process enables technically smooth, safe, and economically feasible spinning via the Viscose or Lyocell process, therefore, the current invention provides an efficient recycling pathway for cotton waste materials.Type: ApplicationFiled: November 18, 2014Publication date: August 18, 2016Applicant: LENZING AGInventors: Christian Weilach, Susanne Möderl, Christian Sperger, Andrea Borgards
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Publication number: 20160237171Abstract: 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: ApplicationFiled: November 14, 2014Publication date: August 18, 2016Applicant: LENZING AGInventors: Johann Männer, Martina Opietnik, Josef Innerlohinger, Gerhard Reiter, Markus Hager
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Publication number: 20160177471Abstract: 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: ApplicationFiled: June 13, 2014Publication date: June 23, 2016Applicant: Lenzing AGInventors: Gregor Kraft, Gert Kroner, Thomas Röder, Heinrich Firgo
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Publication number: 20160138217Abstract: 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: ApplicationFiled: January 20, 2016Publication date: May 19, 2016Applicant: Lenzing AGInventors: Gabriele Emlinger, Ulf Mathes, Alexander Gstettner, Gert Kroner
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Publication number: 20160053061Abstract: The present invention relates to a method for the production of films made of polysaccharides which, as a fiber-forming substance, contain ?(1?3)-glucan, as well as to the films made thereof and to their use.Type: ApplicationFiled: April 10, 2014Publication date: February 25, 2016Applicant: LENZING AGInventors: Franz Dürnberger, Andreas Schweigart, Gerold Riedl, Elisabeth Beiter, Gert Kroner
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Publication number: 20160053406Abstract: The present invention relates to a method for the production of polysaccharide fibers which, as a fiber-forming substance, comprise a mixture of cellulose and ?(1?3)-glucan, as well as to the fibers made thereof and to their use.Type: ApplicationFiled: April 4, 2014Publication date: February 25, 2016Applicant: LENZING AGInventors: Franz Dürnberger, Sigrid Redlinger, Christoph Schrempf, Hartmut Rüf, Heinrich Firgo, Gert Kroner
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Publication number: 20150159302Abstract: 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: ApplicationFiled: February 12, 2015Publication date: June 11, 2015Applicant: LENZING AGInventors: Johann Leitner, Gert Kroner, Egon Dünser, Karin Kämpf, Harald Schobesberger, Ronald Möslinger
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Publication number: 20140318415Abstract: 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: ApplicationFiled: July 8, 2014Publication date: October 30, 2014Applicant: LENZING AGInventors: Josef Innerlohinger, Heinrich Firgo, Helmut Schkorwaga
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Publication number: 20140205830Abstract: The present invention relates to high-strength, possibly pigment-containing—for example flame-retardant—regenerated cellulosic filaments having improved textile properties, in particular as regards strength and uniformity, to their use for the production of fabrics, and to a method for the production of these filaments.Type: ApplicationFiled: June 18, 2012Publication date: July 24, 2014Applicant: LENZING AGInventors: Robert Malinowsky, Martin Neunteufel, Franz Gugerell
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Publication number: 20140037933Abstract: 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: ApplicationFiled: October 10, 2013Publication date: February 6, 2014Applicant: LENZING AGInventors: Hartmut Rüt, Clemens Bisjack, Gert Kroner