Patents by Inventor Rolf Wehrmann

Rolf Wehrmann 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).

  • Publication number: 20190366621
    Abstract: The invention relates to a method for producing an object by means of a fused deposition modeling method (FDM), from a construction material, wherein the construction material comprises a polycarbonate and a di-glycerol ester. The invention also relates to the use of a polycarbonate with improved flowability comprising a diglycerol as construction material in an additive fused deposition modeling method.
    Type: Application
    Filed: February 13, 2018
    Publication date: December 5, 2019
    Inventors: Dirk ACHTEN, Thomas BUSGEN, Rolf WEHRMANN, Helmut Werner HEUER
  • Publication number: 20190344497
    Abstract: A method for producing an object with layers of different materials in an additive manufacturing process comprises the following steps: I) providing a construction material heated at least in part to a temperature above its glass transition temperature on a substrate, so that a layer of the construction material is obtained which corresponds to a first selected cross section of the object; II) providing a construction material heated at least in part to a temperature above its glass transition temperature on a previously provided layer of the construction material, so that another layer of the construction material is obtained which corresponds to another selected cross section of the object and which is connected to the previously provided layer; repeating step II) until the object is formed.
    Type: Application
    Filed: December 22, 2017
    Publication date: November 14, 2019
    Inventors: Dirk Achten, Thomas BÜSGEN, Peter REICHERT, Nicolas DEGIORGIO, Rolf WEHRMANN, Helmut Werner HEUER, Eckhard WENZ
  • Publication number: 20190344555
    Abstract: A process for manufacturing an article, comprising the step of manufacturing the article via an additive fabrication process from a structural material, is notable in that the structural material comprises a polymer selected from the following group: (co)polycarbonates, polyesters, polyestercarbonates, polyformals, polyamides, polyethers, polyvinyl chloride, polymethyl (meth)acrylate, polystyrene or a combination of at least two thereof and an additive absorbing infrared radiation. The additive absorbing infrared radiation is selected for its chemical structure and its concentration in the structural material such that it reduces transmission by the structural material of light in the wavelength range between 600 nm and 1700 nm, determined on a sample 100 ?m thick, by ?2.5 percentage points relative to a structural material sample with a thickness of 100 ?m that does not contain the additive absorbing infrared radiation.
    Type: Application
    Filed: December 22, 2017
    Publication date: November 14, 2019
    Inventors: Dirk ACHTEN, Thomas BUSGEN, Rolf WEHRMANN, Helmut Werner HEUER
  • Patent number: 10472516
    Abstract: The present invention relates to the use of diglycerol esters to enhance the flowability of graphite-containing, thermally conductive polycarbonate compositions. Melt viscosities and melt volume flow rates are improved.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: November 12, 2019
    Assignee: Coverstro Deutschland AG
    Inventors: Helmut Werner Heuer, Rolf Wehrmann, Anke Boumans, Michael Erkelenz
  • Publication number: 20190276597
    Abstract: The invention relates to the use of a composition A based on aromatic polycarbonate, containing a) aromatic polycarbonate, wherein the polycarbonate has an average weight-average molecular weight Mw of 22000 g/mol to 27000 g/mol, determined by means of gel permeation chromatography according to DIN 55672-1:2007-08, and calibrated in relation to bisphenol A-polycarbonate standards using dichloromethane as an eluent, and wherein the polycarbonate has 0 to max. 19 mol % carbonate units of formula (1) where R1, R2, R3, R4, R5, R6, R7 and R8 independently represent H or C1- to C6-alkyl, and b) 0 to less than 0.2 wt.
    Type: Application
    Filed: September 18, 2017
    Publication date: September 12, 2019
    Inventors: Martin DÖBLER, Rolf WEHRMANN, Anke BOUMANS, Lucia WINKLER, Martin BURGER
  • Publication number: 20190255825
    Abstract: The present invention relates to a composite material comprising one or more fibre layers composed of a fibre material and an aromatic polycarbonate-based matrix material. The fibre layer(s) is/are embedded in the matrix material. The present invention further relates to a process for producing these fibre composite materials, to multilayer composite materials comprising several layers of fibre composite material, and to the use of the composite materials for production of components or housing components or housings, and to the components, housing components or housings themselves.
    Type: Application
    Filed: July 3, 2017
    Publication date: August 22, 2019
    Inventors: Rolf WEHRMANN, Anke BOUMANS, Helmut Werner HEUER, Thomas GRIMM, Matthias KNAUPP, John BAUER
  • Patent number: 10323145
    Abstract: The invention relates to copolycarbonate compositions having cyclic and linear oligomers and improved optical properties, to their use for producing blends and moldings and to moldings obtained therewith. The copolycarbonate compositions comprise (A) 5% to 99% by weight, based on the total weight of the copolycarbonate composition, of a copolycarbonate containing one or more monomer units of the formula (1) wherein R1 is hydrogen or C1-C4-alkyl, R2 is C1-C4-alkyl, and n is 0, 1, 2 or 3 and (B) 95% to 1% by weight, based on the total weight of the copolycarbonate composition, of a (co)polycarbonate containing one or more monomer units of the general formula (2) wherein R3 is H or linear or branched C1-C10 alkyl and R4 is linear or branched C1-C10 alkyl.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: June 18, 2019
    Assignee: COVESTRO DEUTSCHLAND AG
    Inventors: Rolf Wehrmann, Helmut Werner Heuer, Anke Boumans
  • Publication number: 20190161576
    Abstract: The invention relates to compositions comprising polycarbonate and to a mixture comprising a carboxylic acid and the glycerol and/or diglycerol esters thereof, to the use of the compositions for production of blends or mouldings and to mouldings obtainable therefrom. The compositions have improved rheological and optical properties.
    Type: Application
    Filed: May 19, 2017
    Publication date: May 30, 2019
    Inventors: Rolf WEHRMANN, Helmut Werner HEUER, Anke BOUMANS
  • Publication number: 20190153199
    Abstract: The invention relates to glass-fibre- and/or carbon-fibre-reinforced polycarbonate compositions having improved flowability coupled with good heat resistance and to articles of manufacture produced from said compositions, in particular those from the thin wall applications sector, for example housing parts for ultrabooks or smartphones. The compositions comprise at least one saturated or unsaturated monocarboxylic acid having a chain length of 6 to 30 carbon atoms and at least one ester of these monocarboxylic acids based on glycerol and/or diglycerol.
    Type: Application
    Filed: May 22, 2017
    Publication date: May 23, 2019
    Inventors: Rolf WEHRMANN, Helmut Werner HEUER, Anke BOUMANS
  • 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
  • Publication number: 20190136047
    Abstract: The invention relates to compositions containing polycarbonate and carboxylic acid esters of isosorbide, to the use of the compositions for the production of blends or shaped parts and to molded parts obtained therefrom. The compositions have improved rheological and optical properties and an improved demolding and processing behavior in the injection-molding process.
    Type: Application
    Filed: April 13, 2017
    Publication date: May 9, 2019
    Inventors: Helmut Werner HEUER, Rolf WEHRMANN, Anke BOUMANS
  • Patent number: 10189941
    Abstract: The invention relates to polycarbonate compositions with an improved thermal behavior and improved slip characteristics, achieved by the use of oxidized, acid-modified polyethylene waxes.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: January 29, 2019
    Assignee: Covestro Deutschland AG
    Inventors: Rolf Wehrmann, Helmut Werner Heuer, Anke Boumans, Michael Erkelenz
  • Publication number: 20180355167
    Abstract: The invention relates to polycarbonate compositions having high flowability and good thermal properties, comprising specific glycidyl ether compounds and typically at least one additive from the group of the thermal stabilizers, UV stabilizers and/or demoulding agents, and to mouldings made from these compositions. The polycarbonate compositions have high flowability and good thermal properties. The invention also relates to the improvement in the flowability of polycarbonate melts.
    Type: Application
    Filed: December 8, 2016
    Publication date: December 13, 2018
    Inventors: Rolf WEHRMANN, Helmut Werner HEUER, Anke BOUMANS
  • Patent number: 10131123
    Abstract: The invention relates to a multi-layer film composite having at least one layer made of polycarbonate or copolycarbonate, characterized in that the polycarbonate or copolycarbonate comprises at least one additive of the general formulas (1) to (8), R1 are selected independently of each other from the group made of C10-C25-alkyl, C10-C25-alkoxy, and C10-C25-alkyl-substituted aryl, R2 are selected independently of each other from the group of C10-C25-alkylcarbonyl or hydrogen, and R3 are selected independently of each other from the group of C10-C25-alkyl.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: November 20, 2018
    Assignee: Covestro AG
    Inventors: Helmut Werner Heuer, Rolf Wehrmann
  • Patent number: 10119009
    Abstract: The present invention relates to the use of diglycerol esters for enhancing the flowability of transparent polycarbonate compositions. Melt viscosities and melt volume flow rates are improved. In addition, the diglycerol esters also exert a positive effect on the optical properties by increasing the transmission of the compositions and reducing the yellowness index.
    Type: Grant
    Filed: November 26, 2015
    Date of Patent: November 6, 2018
    Assignee: Covestro Deutschland AG
    Inventors: Rolf Wehrmann, Helmut Werner Heuer, Anke Boumans
  • Publication number: 20180201780
    Abstract: The present invention relates to the use of diglycerol esters to enhance the flowability of graphite-containing, thermally conductive polycarbonate compositions. Melt viscosities and melt volume flow rates are improved.
    Type: Application
    Filed: July 5, 2016
    Publication date: July 19, 2018
    Inventors: Helmut Werner HEUER, Rolf WEHRMANN, Anke BOUMANS, Michael ERKELENZ
  • Publication number: 20180201755
    Abstract: The present invention relates to the use of diglycerol esters to increase the flowability of impact-modified polycarbonate-containing compositions, without adverse effect on mechanical and thermal properties. Melt viscosities and melt volume flow rates are improved. In comparison with conventional flow improvers moreover smaller quantities of diglycerol esters are sufficient to achieve the desired flow improvement.
    Type: Application
    Filed: July 5, 2016
    Publication date: July 19, 2018
    Inventors: ROLF WEHRMANN, Helmut Werner HEUER, Anke BOUMANS
  • Publication number: 20180194926
    Abstract: The present invention relates to thermally conductive compositions based on a thermoplastic polymer and boron nitride. The compositions contain at least one diglycerol ester to improve flow. These compositions additionally have good heat distortion resistance, and so the compositions are especially usable for the production of heat sinks.
    Type: Application
    Filed: July 5, 2016
    Publication date: July 12, 2018
    Inventors: BIRTE SÄMISCH, Rolf WEHRMANN, Helmut Werner HEUER, Timo KUHLMANN
  • Publication number: 20180194925
    Abstract: The present invention relates to a thermally conductive composition based on a thermoplastic polymer and a hybrid boron nitride material. The compositions contain at least one diglycerol ester to improve flow. These compositions additionally have good heat distortion resistance, and so the compositions are especially usable for the production of heat sinks.
    Type: Application
    Filed: July 5, 2016
    Publication date: July 12, 2018
    Inventors: Birte SÄMISCH, Rolf WEHRMANN, Helmut Werner HEUER, Timo KUHLMANN
  • Publication number: 20180179378
    Abstract: The invention relates to copolycarbonate compositions having cyclic and linear oligomers and improved optical properties, to their use for producing blends and moldings and to moldings obtained therewith.
    Type: Application
    Filed: July 31, 2015
    Publication date: June 28, 2018
    Inventors: Rolf Wehrmann, Helmut Werner Heuer, Anke Boumans