Patents by Inventor Dieter Wittmann

Dieter Wittmann 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).

  • Polymer blends containing polyamide and rubber modified polymers produced by a mass polymerization method
    Publication number: 20030181591
    Abstract: The present invention relates to polymer blends containing
    Type: Application
    Filed: November 14, 2002
    Publication date: September 25, 2003
    Inventors: Holger Warth, Gerwolf Quaas, Dieter Wittmann
  • Weather-resistant polymer blends
    Publication number: 20030181582
    Abstract: The present invention relates to weather-resistant polymer blends containing
    Type: Application
    Filed: November 14, 2002
    Publication date: September 25, 2003
    Inventors: Holger Warth, Gerwolf Quaas, Dieter Wittmann, Heinrich Alberts
  • Non-inflammable, anti-electrostatic polycarbonate molding materials
    Publication number: 20030171472
    Abstract: The present invention relates to anti-electrostatic polycarbonate compositions which are provided with chlorine- and bromine-free flame resistance and are distinguished by good mechanical and thermal properties and problem-free processability in the injection moulding process, i.e. by a good melt flowability and a low tendency towards juicing. The present invention also relates to the use of the polycarbonate moulding compositions according to the invention for the production of shaped articles and mouldings of all types, and the shaped articles and mouldings themselves.
    Type: Application
    Filed: November 26, 2002
    Publication date: September 11, 2003
    Inventors: Andreas Seidel, Thomas Eckel, Michael Zobel, Dieter Wittmann, Manfred Dietrich
  • Flame-resistant polycarbonate ABS moulding materials
    Patent number: 6613822
    Abstract: A thermoplastic molding composition that contains aromatic polycarbonate and/or polyester carbonate, a graft polymer, phosphazene compound, phosphorus compound and fluorinated polyolefin is disclosed. The composition exhibits excellent flame retardance and very good mechanical properties, including weld line strength and impact strength.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: September 2, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Michael Zobel, Dieter Wittmann
  • Non-inflammable, translucent polycarbonate molding materials
    Publication number: 20030158304
    Abstract: The present invention relates to flame-resistant translucent polycarbonate moulding compositions which comprise oligophosphates and specific fluorinated polyolefins and have an excellent flameproofing and resistance to chemicals.
    Type: Application
    Filed: November 25, 2002
    Publication date: August 21, 2003
    Inventors: Torsten Derr, Thomas Eckel, Michael Zobel, Dieter Wittmann, Andreas Seidel
  • Bead polymerizates containing halogen-free phosphourus compounds
    Publication number: 20030158303
    Abstract: The present invention relates to novel crosslinked bead polymers having an average particle size of 1 to 1000 &mgr;m containing specific, halogen-free phosphorus compounds, to a process for the production of these bead polymers and to the use thereof as flame retardants in thermoplastics.
    Type: Application
    Filed: November 13, 2002
    Publication date: August 21, 2003
    Inventors: Wolfgang Podszun, Andreas Seidel, Thomas Eckel, Dieter Wittmann, Kamelia Karlou-Eyrisch
  • Impact-resistance modified polymer compositions
    Publication number: 20030153677
    Abstract: An impact resistance-modified polymer composition containing
    Type: Application
    Filed: November 14, 2002
    Publication date: August 14, 2003
    Inventors: Holger Warth, Gerwolf Quass, Dieter Wittmann
  • Extrudable polycarbonate molding compositions
    Publication number: 20030153658
    Abstract: A thermoplastic molding composition comprising A) at least one member selected from the group consisting of polycarbonate and polyestercarbonate and B) a phosphorus compound is disclosed. The composition wherein A) is a mixture of (A.1) 99.9 to 40 wt. % of branched member, and (A.2) 0.1 to 60 wt. % of linear member, is characterized by high melt stability and improved mechanical properties, particularly improved stress crack resistance under the effect of chemicals and a higher notched impact resistance. The composition is especially suitable for producing profiles, films or sheets of any type in an extrusion process.
    Type: Application
    Filed: December 16, 2002
    Publication date: August 14, 2003
    Inventors: Andreas Siedel, Klaus Kircher, Thomas Eckel, Dieter Wittmann
  • Flame-resistant polycarbonate ABS moulding material
    Patent number: 6596794
    Abstract: Thermoplastic moulding compositions based on polycarbonate and/or polyester-carbonate comprising graft polymer prepared by means of bulk, solution or bulk-suspension polymerization processes and phosphorus compounds of the general formula (I)
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: July 22, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Michael Zobel, Bernd Keller, Dieter Wittmann
  • Polycarbonate molding materials exhibiting improved mechanical properties
    Patent number: 6596800
    Abstract: A thermoplastic molding compositions comprising thermoplastic polycarbonate and an additive amount of a zinc compound having an average particle diameter of 1 nm to 20 &mgr;m is disclosed. The composition has an improved crude shade and improved mechanical properties.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: July 22, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Zobel, Thomas Eckel, Dieter Wittmann, Bernd Keller
  • Flame-resistant molding compounds
    Patent number: 6590015
    Abstract: The invention relates to flame-resistant poly-carbonate/ABS molding compounds which are considerably improved in their mechanical properties and thermal stability by an addition of polyalkylene terephthalate and an oligomeric phosphate.
    Type: Grant
    Filed: January 3, 1995
    Date of Patent: July 8, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Dieter Wittmann, Horst Beicher
  • Mineral-reinforced impact-resistant modified polycarbonate blends
    Publication number: 20030125441
    Abstract: A mineral-filled, impact-resistant thermoplastic molding composition is disclosed. The composition contains at least one resin selected from the group consisting of polycarbonate and polyester carbonate B) impact resistance modifier, and C) wollastonite having carbon content greater than 0.1% relative to the weight of the wollastonite as determined by elemental analysis. Exhibiting high modulus of elasticity and a good toughness, in particular also at low temperatures, the composition is suitable for car body external applications.
    Type: Application
    Filed: October 22, 2002
    Publication date: July 3, 2003
    Inventors: Marc Vathauer, Andreas Seidel, Detlev Joachimi, Dieter Wittmann
  • Composition based on copolycarbonates
    Patent number: 6583257
    Abstract: The invention relates to thermoplastic copolycarbonate compositions and moulded parts containing the latter having improved stress cracking resistance and thermal stability.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: June 24, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Holger Warth, Thomas Eckel, Dieter Wittmann, Silke Kratschmer
  • Flame resistant thermostable polycarbonate ABS moulding compounds
    Patent number: 6583204
    Abstract: Thermoplastic moulding composition comprising at least 2 components chosen from the group consisting of aromatic poly(ester)carbonates, graft polymers of one or more vinyl monomers on one or more graft bases having a glass transition temperature of <10° C., thermoplastic vinyl (co)polymer and polyalkylene terephthalate and 0.5 to 20 parts by wt. phosphorus compound of the general formula (I).
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: June 24, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Dieter Wittmann, Jörn Stölting, Michael Zobel
  • Impact-resistant poly(ester)carbonate composition
    Publication number: 20030114563
    Abstract: Impact-resistant polycarbonate and/or polyester carbonate compositions containing at least one oxalate compound selected from the group consisting of metal oxalates, metal hydroxy oxalates, oxalic acid esters and metal salts of oxalic acid esters in quantities of 0.1 to 5 parts by weight (based on 100 parts by weight of the total composition) display an advantageous combination of flow line strength and stress-cracking resistance on exposure to chemicals combined with high thermal stability and good processing properties and they are also flame-resistant.
    Type: Application
    Filed: September 17, 2002
    Publication date: June 19, 2003
    Inventors: Andreas Seidel, Thomas Eckel, Dieter Wittmann
  • Impact-resistant and flameproofed polycarbonate molding compositions
    Publication number: 20030109612
    Abstract: An impact resistant, flame-resistant thermoplastic molding composition suitable for making thin-wall housing parts is disclosed. The composition contains A) 50 to 90 parts by weight of at least one a member selected from the group consisting of polycarbonate and polyester carbonate, B) 5 to 20 parts by weight of rubber-modified vinyl (co)polymer C) 2 to 15 parts by weight of at least one low-volatility, halogen-free flameproofing agent, D) 0.1 to 6 parts by weight of a silicate mineral, and optional E) fluorinated polyolefin, and F) conventional polymer additive wherein the total sum of the parts by weight of the components A) to F) is 100, and wherein the rubber content of the composition referred to the weight of the composition is 2 to 6 wt.-%.
    Type: Application
    Filed: October 22, 2002
    Publication date: June 12, 2003
    Inventors: Andreas Seidel, Thomas Eckel, Dieter Wittmann
  • Flame-resistant polycarbonate moulding compounds
    Publication number: 20030105196
    Abstract: The present invention relates to flame-resistant polycarbonate compositions which are rendered flame-resistant in chlorine-free, bromine-free manner, contain ≦0.1 wt. % fluorine and are distinguished by excellent flame resistance even at low wall thickness, combined with improved mechanical, thermal and Theological properties and in particular also demonstrate good resistance to ESC. The present invention also relates to the use of the polycarbonate moulding compositions according to the invention to produce mouldings and moulded parts as well as extruded profiles of all types.
    Type: Application
    Filed: September 3, 2002
    Publication date: June 5, 2003
    Inventors: Andreas Seidel, Thomas Eckel, Bernd Keller, Dieter Wittmann
  • Flame and stress crack resistant polycarbonate molding compositions
    Patent number: 6569930
    Abstract: A flame resistant thermoplastic molding composition is disclosed. The composition contains aromatic polycarbonate, graft polymer, a specifically structured phosphorous compound, fluorinated polyolefin and inorganic compound with an average particle size no greater that 200 nm and an optional vinyl(co)polymer. The inventive composition is characterized in its improved stress cracking resistance and mechanical properties.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: May 27, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Dieter Wittmann, Michael Zobel, Bernd Keller, Heinrich Alberts
  • Flame-resistant thermostable polycarbonate ABS moulding materials
    Patent number: 6566428
    Abstract: A flame-resistant, thermoplastic molding composition characterized by its improved stress cracking resistance, notched impact strength and heat resistance is disclosed. The composition contains A) an aromatic polycarbonate or polyestercarbonate, B) a graft polymer of B.1 5 to 95 wt. % of one or more vinyl monomers on B.2 5 to 95 wt. % of one or more graft substrates with a glass transition temperature below 10° C. and an average particle size (d50 value) of 0.05 to 5 &mgr;m, C) 0 to 50 parts by weight of a thermoplastic vinyl copolymer, D) 0.5 to 20 parts by weight of at least one phosphorus compound of the general formula (I) and optionally at least one further phosphorus compound which differs from compounds of the formula (I), and E) 0.05 to 5 parts by weight of a fluorinated polyolefin.
    Type: Grant
    Filed: February 7, 2000
    Date of Patent: May 20, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Dieter Wittmann, Michael Zobel, Heinrich Alberts
  • Flame-resistant polycarbonate moulding compounds for extrusion applications
    Publication number: 20030092805
    Abstract: The present invention relates to chlorine- and bromine-free, flame-resistant poly-carbonate moulding compositions which are distinguished by excellent flame resistance combined with good mechanical and thermal properties, good ESC behaviour and adequate melt stability for extrusion processing. The invention relates also to mouldings, profiles, sheets, tubes and conduits produced from the moulding compositions.
    Type: Application
    Filed: September 3, 2002
    Publication date: May 15, 2003
    Inventors: Andreas Seidel, Thomas Eckel, Bernd Keller, Dieter Wittmann