Patents by Inventor Christopher SCHIRWITZ

Christopher SCHIRWITZ 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: 11912865
    Abstract: The present invention relates to a thermoplastic composition comprising at least one aromatic polycarbonate, talc, at least one anhydride-modified alpha-olefin polymer, at least one organic flame retardant selected from: fluoropolymer-containing anti-drip agents, fluorinated sulfonic acid salts, organic phosphoric acid esters, phosphazenes or mixtures of at least two of the abovementioned agents and barium sulfate. The invention further relates to a production process for such a composition and to a molded article producible from this composition. The composition contains barium sulfate in an amount of ?3% by weight based on the total weight of the composition. ?5% by weight is preferred.
    Type: Grant
    Filed: April 9, 2020
    Date of Patent: February 27, 2024
    Assignee: Covestro Intellectual Property GmbH & Co. KG
    Inventors: Christopher Schirwitz, Tim Hungerland, Tanja Grueter-Reetz, Helmut Kruells
  • Patent number: 11795323
    Abstract: The invention relates to a composition obtainable by mixing polycarbonate, unsized talc and a specific anhydride-modified alpha-olefin polymer, wherein the amounts of the talc and the specific anhydride-modified alpha-olefin polymer are matched to one another such that, for every 10 parts by weight of the talc, 0.10 to 1.4 parts by weight of the anhydride-modified alpha-olefin polymer are used. It has been shown that in situ sizing of talc with the wax can minimize the degradation of the polycarbonate only in the course of mixing with the polycarbonate and, at the same time, properties such as multiaxial impact resistance and flowability can be improved.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: October 24, 2023
    Assignee: Covestro Deutschland AG
    Inventors: Christopher Schirwitz, Michael Erkelenz, Birte Sämisch, Alexander Meyer
  • Publication number: 20220371309
    Abstract: The present invention relates to a layered composite comprising a poly carbonate-based matrix, possibly containing fibres, and an outer layer of special poly carbonate-polyester blends, and also to a layered composite such as that described above and provided with painting on that side of its outer layer which is facing away from the matrix, to a method for producing these composites and also to their use for the production for example of automobile add-on parts.
    Type: Application
    Filed: October 28, 2020
    Publication date: November 24, 2022
    Inventors: Christopher SCHIRWITZ, Matthias KNAUPP, Marius NOLTE, Ralf HUFEN, Dirk HINZMANN, Sven SIEGEMUND, Uwe KLIPPERT
  • Patent number: 11485853
    Abstract: The invention relates to compositions based on aromatic polycarbonate comprising metal oxide-coated micas as effect pigment, which do not have any significant increase in molecular weight of the polycarbonate, as can be seen from the MVR, under thermal stress. This is achieved by the addition of small amounts of an anhydride-modified ?-olefin polymer, optionally in combination with phosphorus-containing thermal stabilizer.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: November 1, 2022
    Assignee: COVESTRO DEUTSCHLAND AG
    Inventors: Derk Erich Wandner, Ingmar Hermsdorfer, Christopher Schirwitz
  • Publication number: 20220220301
    Abstract: The present invention relates to a thermoplastic composition comprising at least one aromatic polycarbonate, talc, at least one anhydride-modified alpha-olefin polymer, at least one organic flame retardant selected from: fluoropolymer-containing anti-drip agents, fluorinated sulfonic acid salts, organic phosphoric acid esters, phosphazenes or mixtures of at least two of the abovementioned agents and barium sulfate. The invention further relates to a production process for such a composition and to a molded article producible from this composition. The composition contains barium sulfate in an amount of ?3% by weight based on the total weight of the composition. ?5% by weight is preferred.
    Type: Application
    Filed: April 9, 2020
    Publication date: July 14, 2022
    Inventors: Christopher SCHIRWITZ, Tim HUNGERLAND, Tanja GRUETER-REETZ, Helmut KRUELLS
  • Publication number: 20220162442
    Abstract: The invention relates to a composition obtainable by mixing polycarbonate, unsized talc and a specific anhydride-modified alpha-olefin polymer, wherein the amounts of the talc and the specific anhydride-modified alpha-olefin polymer are matched to one another such that, for every 10 parts by weight of the talc, 0.10 to 1.4 parts by weight of the anhydride-modified alpha-olefin polymer are used. It has been shown that in situ sizing of talc with the wax can minimize the degradation of the polycarbonate only in the course of mixing with the polycarbonate and, at the same time, properties such as multiaxial impact resistance and flowability can be improved.
    Type: Application
    Filed: August 23, 2017
    Publication date: May 26, 2022
    Inventors: Christopher Schirwitz, Michael ERKELENZ, Birte SÄMISCH, Alexander MEYER
  • Publication number: 20220135755
    Abstract: The invention relates to a multilayer body comprising at least one substrate layer, a metal layer bonded directly thereto and optionally at least one protective layer atop the metal layer, wherein the substrate layer comprises a composition which is obtained by mixing polycarbonate, talc and a specific wax. It was shown that the multilayer bodies obtained are particularly suitable for use as reflectors and (housing) components for light sources and heat sources and displays.
    Type: Application
    Filed: December 12, 2018
    Publication date: May 5, 2022
    Applicant: Covestro Deutschland AG
    Inventors: Christopher SCHIRWITZ, Michael ERKELENZ, Birte SÄMISCH, Rainer PROTTE, Martin DÖBLER, Eckhard WENZ
  • Publication number: 20210102062
    Abstract: The invention relates to compositions based on aromatic polycarbonate comprising metal oxide-coated micas as effect pigment, which do not have any significant increase in molecular weight of the polycarbonate, as can be seen from the MVR, under thermal stress. This is achieved by the addition of small amounts of an anhydride-modified ?-olefin polymer, optionally in combination with phosphorus-containing thermal stabilizer.
    Type: Application
    Filed: April 25, 2018
    Publication date: April 8, 2021
    Inventors: Derk Erich WANDNER, Ingmar HERMSDORFER, Christopher SCHIRWITZ
  • Publication number: 20190143582
    Abstract: The invention relates to the use of copolycarbonates stable at high temperature as a supporting material in the FDM (fused deposition modeling) method, said copolycarbonates having a Vicat temperature determined in accordance with ISO 306:2013 of at least 150° C. Polyester, polyamide, PC/polyester blend, and/or polyaryl ether ketone is used as a printing material.
    Type: Application
    Filed: May 3, 2017
    Publication date: May 16, 2019
    Applicant: Covestro Deutschland AG
    Inventors: Tim HUNGERLAND, Matthias ROTHE, Rolf WEHRMANN, Klaus HORN, Christopher SCHIRWITZ, Tanja CASSEL