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).

  • Publication number: 20020072553
    Abstract: Flame-resistant, thermoplastic moulding compositions containing
    Type: Application
    Filed: November 17, 1999
    Publication date: June 13, 2002
    Inventors: THOMAS ECKEL, MICHAEL BODIGER, DIETER WITTMANN, HEINRICH ALBERTS, KLAUS HORN
  • Publication number: 20020058716
    Abstract: Composites of at least two different plastics materials joined directly to one another, wherein
    Type: Application
    Filed: April 17, 2000
    Publication date: May 16, 2002
    Inventors: DIETER WITTMANN, THOMAS ECKEL, BERND KELLER, WOLFGANG RASCHILAS
  • Patent number: 6326423
    Abstract: The present invention relates to polycarbonate-ABS molding compositions containing phosphorus compounds which are group IB, IIB or VIII metal salts of partial phosphoric acid esters which have excellent mechanical properties, in particular excellent notched impact strength, stress cracking behavior and heat resistance.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: December 4, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Michael Zobel, Dieter Wittmann
  • Patent number: 6320016
    Abstract: X-ray detectable molded articles prepared from polycarbonate resins are disclosed. The articles, preferably toys or medical equipment, are molded of polycarbonate the structure of which contains units derived from iodophenyl.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: November 20, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Bödiger, Wolfgang Ebert, Heinrich Alberts, Dieter Wittmann, Thomas Eckel
  • Patent number: 6228938
    Abstract: Thermoplastic materials containing A) 5 to 80 parts by weight of a thermoplastic co- or terpolymer made from the monomers styrene, &agr;-methylstyrene, methyl methacrylate, acrylonitrile with an average molecular weight ({overscore (M)}w) of 70,000 to 119,000, B) 1 to 30 parts by weight of a thermoplastic copolymer made from 60 to 95% by weight of styrene and/or &agr;-methylstyrene and 40 to 5% by weight of acrylonitrile with an average molecular weight ({overscore (M)}w) of 25,000 to 49,500, C) 0.1 to 10 parts by weight of a thermoplastic co- or terpolymer made from the monomers styrene, &agr;-methylstyrene, methyl methacrylate, acrylonitrile with an average molecular weight ({overscore (M)}w) of 1,500 to 6,000 and D) 0.5 to 50 parts by weight of a particulate rafted rubber with a glass transition temperature ≦10° C. and an average particle diameter (d50) of 0.05 to 0.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: May 8, 2001
    Assignee: Bayer AG
    Inventors: Herbert Eichenauer, Karl-Heinz Ott, Dieter Wittmann, Alfred Pischtschan
  • Patent number: 6140426
    Abstract: The present invention relates to thermoplastic graft polymer moulding compositions for high-gloss applications, which exhibit a reduced tendency of the additives to exude out of the thermoplastic composition during processing, and which exhibit reduced deposit build-up in the mould.
    Type: Grant
    Filed: March 24, 1998
    Date of Patent: October 31, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bahman Sarabi, Herbert Eichenauer, Edgar Leitz, Heinrich Alberts, Thomas Eckel, Dieter Wittmann
  • Patent number: 6057394
    Abstract: Thermoplastic moulding compositions containingA. a thermoplastic polymer andB. 0.1 to 50% by weight, with respect to A, of an inorganic substance with an average particle diameter of 0.1 to 100 nm,and the use of superfine inorganic substances as defined by B for increasing the X-ray contrast of thermoplastic moulding compositions comprising A and B.
    Type: Grant
    Filed: November 22, 1996
    Date of Patent: May 2, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Bodiger, Herbert Eichenauer, Heinrich Alberts, Dieter Wittmann, Thomas Eckel, Peter Kruger
  • Patent number: 5994463
    Abstract: Thermoplastic polycarbonate/graft polymer moulding compositions containingA) 5 to 95 parts by weight of an aromatic polycarbonate,B) 1 to 50 parts by weight of at least one thermoplastic homopolymer, copolymer or terpolymer of styrene, .alpha.-methylstyrene, acrylonitrile, N-substituted maleimide or mixtures thereof,C) 1 to 50 parts by weight of at least one graft polymer ofC.1) 5 to 90 parts by weight of styrene, .alpha.-methylstyrene, acrylonitrile, N-substituted maleimide or mixtures thereof, onC.2) 95 to 10 parts by weight of a rubber with a glass transition temperature .ltoreq.0.degree. C. andD) 1 to 25 parts by weight (per 100 parts by weight A+B+C) of at least one additive selected from flame retardants, lubricants, antistatic agent, mould release agents or mixtures thereof,characterised in that the component B) is produced by bulk, solution or suspension polymerisation and has an oligomer content .ltoreq.1 wt.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: November 30, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Dieter Wittmann, Heinrich Alberts, Bahman Sarabi, Herbert Eichenauer, Edgar Leitz
  • Patent number: 5849827
    Abstract: Thermoplastic molding compositions containing:A. A thermoplastic polymer of ethylenically unsaturated monomers or a polycondensate of bifunctional reactive compounds,B. 0.01 to 50, preferably 0.1 to 10 parts by weight per 100 parts by weight of (A) of extremely finely divided inorganic powder with a mean particle diameter of 1 to 200 nm, preferably 1 to 150 nm, in particular 1 to 100 nmandC. 0.1 to 50, preferably 0.5 to 20 parts by weight per 100 parts by weight of (A) of flame retardant.
    Type: Grant
    Filed: August 7, 1996
    Date of Patent: December 15, 1998
    Assignee: Bayer AG
    Inventors: Michael Bodiger, Thomas Eckel, Dieter Wittmann, Heinrich Alberts
  • Patent number: 5750602
    Abstract: The invention relates to flameproofed polycarbonate/ABS blends which are resistant to stress cracking, wherein the polycarbonates are wholly or partly modified by halobutyl rubber blocks.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: May 12, 1998
    Assignee: Bayer AG
    Inventors: Burkhard Kohler, Jurgen Kirsch, Richard Weider, Dieter Wittmann, Horst Beicher
  • Patent number: 5741838
    Abstract: This invention relates to halogen-free flame retardant thermoplastic moulding compounds prepared from polycarbonate and graft polymer, which may contain thermoplastic copolymer and/or polyalkylene terephthalate, wherein the flame retardant used is polyphenylene oxide combined with phosphorus compounds.
    Type: Grant
    Filed: August 9, 1995
    Date of Patent: April 21, 1998
    Assignee: Bayer AG
    Inventors: Karl Fuhr, Thomas Eckel, Dieter Wittmann, Heinrich Alberts
  • Patent number: 5679759
    Abstract: Thermoplastic moulding materials containingA. 15 to 80 parts by weight of a thermoplastic polycarbonate or polyester carbonate, andB. 4 to 40 parts by weight of a graft polymer ofB.1 20 to 60 weight % of one or more monomers onB.2 40 to 80 weight % of one or more graft bases having glass transition temperatures <0.degree. C., andC. 16 to 45 parts by weight of a thermoplastic, aromatic vinyl (co)polymer,wherein the graft base B.2 has an average particle size (d.sub.50 value) of 0.20 to 0.35 .mu.m and the weight ratio of components B:C is between 2:1 and 1:4.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: October 21, 1997
    Assignee: Bayer AG
    Inventors: Dieter Wittmann, Thomas Eckel, Heinrich Alberts, Herbert Eichenauer, Ulrich Jansen
  • Patent number: 5672645
    Abstract: Flame resistant, thermoplastic molding compounds containingA) 40 to 98 parts by weight of an aromatic polycarbonate,B) 3 to 50 parts by weight of a vinyl copolymer,C) 0.5 to 40 parts by weight of a graft polymer,D) 0.5 to 20 parts by weight of a mixture ofD.1) 10 to 90 wt. %, related to D) , of a monophosphorus compound of the formula (I) ##STR1## D.2) 90 to 10 wt. %, related to D), of an oligomeric phosphorus compound of the formula (II) ##STR2## and E) 0.05 to 5 parts by weight of a fluorinated polyolefin with an average particle diameter of 0.05 to 1000 .mu.m, a density of 1.2 to 2.3 g/cm.sup.3 and a fluorine content of 65 to 76 wt. %.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: September 30, 1997
    Assignee: Bayer AG
    Inventors: Thomas Eckel, Dieter Wittmann, Manfred Oller, Heinrich Alberts
  • Patent number: 5658974
    Abstract: The invention relates to halogen-free, flameproofed, thermoplastic moulding compounds made from polycarbonate and graft polymers which may optionally contain a copolymer and/or polyalkylene terephthalate, wherein a silicon resin in combination with a blend of monophosphate and oligomeric polyphosphates is used as a flameproofing agent.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: August 19, 1997
    Assignee: Bayer AG
    Inventors: Karl Fuhr, Thomas Eckel, Dieter Wittmann, Heinrich Alberts
  • Patent number: 5635560
    Abstract: The invention relates to mixtures of polycarbonate, phenolically hydroxyfunctional branched dimeric fatty acid polyesters and optionally graft polymer, which are distinguished by a good low-temperature strength and stress cracking resistance and good mould release properties.
    Type: Grant
    Filed: July 20, 1995
    Date of Patent: June 3, 1997
    Assignee: Bayer AG
    Inventors: Burkhard Kohler, Dieter Wittmann, Wolfgang Ebert, Horst Beicher, Werner Tischer, Klaus Horn
  • Patent number: 5621029
    Abstract: This invention relates to halogen-free flame retardant thermoplastic moulding compositions prepared from polycarbonate and graft polymer, which may optionally contain thermoplastic copolymer and/or polyalkylene terephthalate.The flame retardant used is a synergistic combination of silicone resin and polyphenylene oxide.
    Type: Grant
    Filed: November 24, 1995
    Date of Patent: April 15, 1997
    Assignee: Bayer AG
    Inventors: Thomas Eckel, Karl Fuhr, Dieter Wittmann, Heinrich Alberts
  • Patent number: 5605963
    Abstract: ABS polymer compositions consisting ofA) 5 to 80 parts by weight of at least one ABS polymer prepared by mass polymerization or solution polymerization, having rubber particles with an average particle diameter of from 800 to 15,000 nm and a rubber content of from 1 to 20% by weight,B) 1 to 50 parts by weight of at least one ABS polymer prepared by emulsion polymerization, having an average particle diameter of from 50 to 500 nm and a rubber content of from 20 to 80% by weight,C) 0 to 70 parts by weight of at least one thermoplastic vinyl resin prepared by radical polymerization of at least two monomer components selected from styrene, .alpha.-methylstyrene, methyl methacrylate, acrylonitrile, N-phenylmaleimide andD) 0.5 to 10 parts by weight of at least one polybutadiene prepared by emulsion polymerization, having an average particle diameter d.sub.50 in the latex form of from 80 to 500 nm and a gel content of from 10 to 95% by weight.
    Type: Grant
    Filed: February 6, 1995
    Date of Patent: February 25, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Edgar Leitz, Herbert Eichenauer, Karl-Erwin Piejko, Dieter Wittmann, Ekkehard Frohberg
  • Patent number: 5416161
    Abstract: The present invention relates to a process for producing polymer blends from polycarbonate and mass-polymerized ABS by the condensation of oligocarbonate in the presence of mass-polymerized ABS.
    Type: Grant
    Filed: December 13, 1993
    Date of Patent: May 16, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Werner Nielinger, Hermann Kauth, Dieter Wittmann, Dieter Freitag, Karsten-Josef Idel
  • Patent number: 5393835
    Abstract: 1. Thermoplastic molding compounds containingA. 5 to 95 parts by weight of an aromatic polycarbonate,B. 1 to 50 parts by weight of a vinyl copolymer andC. 5 to 95 parts by weight of one or more graft polymers obtained by graft polymerization,characterized in that 10 to 100% of component A is replaced by a mixture of two polycarbonates A.1 and A.2 of identical structure,1) the relative solution viscosity of A.1 being 1.18 to 1.24,2) the relative solution viscosity of A.2 being 1.24 to 1.34 and3) the difference between the relative solution viscosities of A.1 and A.2 being greater than or equal to 0.
    Type: Grant
    Filed: May 18, 1993
    Date of Patent: February 28, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Dieter Wittmann, Gerhard Fennhoff, Jochen Schoeps, Karl-Heinz Ott, Wolfgang Jakob
  • Patent number: RE36902
    Abstract: Flame resistant, thermoplastic molding compounds containingA) 40 to 98 parts by weight of an aromatic polycarbonate,B) 3 to 50 parts by weight of a vinyl copolymer,C) 0.5 to 40 parts by weight of a graft polymer,D) 0.5 to 20 parts by weight of a mixture ofD.1) 10 to 90 wt. %, related to D) , of a monophosphorus compound of the formula (I) ##STR1## D.2) 90 to 10 wt. %, related to D), of an oligomeric phosphorus compound of the formula (II) ##STR2## and E) 0.05 to 5 parts by weight of a fluorinated polyolefin with an average particle diameter of 0.05 to 1000 .mu.m, a density of 1.2 to 2.3 g/cm.sup.3 and a fluorine content of 65 to 76 wt. %.
    Type: Grant
    Filed: September 27, 1999
    Date of Patent: October 3, 2000
    Assignee: Bayer AG
    Inventors: Thomas Eckel, Dieter Wittmann, Manfred Oller, Heinrich Alberts