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).

  • Patent number: 7709573
    Abstract: A thermoplastic molding composition having improved properties is disclosed. The composition comprises polycarbonate resin, a first graft polymer, a first free copolymer, a second graft polymer and a second free copolymer; the weight-average molecular weight of the first free copolymer being lower by at least 32,000 g/mol with regard to that of the second free copolymer. The inventive composition features improved balance of melt flowability and ductility, good resistance to hydrolysis and process stability.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: May 4, 2010
    Assignee: Bayer MaterialScience AG
    Inventors: Thomas Eckel, Andreas Seidel, Dieter Wittmann
  • Publication number: 20090292059
    Abstract: The present invention relates to a polycarbonate composition comprising polyalkyl(alkyl)acrylate having a specific molecular weight and an impact modifier, as well as to moulded bodies obtainable from these compositions. Compositions according to the present invention exhibit superior properties, in particular with respect of low-temperature strength and melt flowability.
    Type: Application
    Filed: May 18, 2009
    Publication date: November 26, 2009
    Applicant: Bayer MaterialScience AG
    Inventors: Andreas SEIDEL, Evgueni Avtomonov, Dieter Wittmann, Achim Feldermann
  • Publication number: 20090247673
    Abstract: The present invention relates to compositions comprising A) aromatic polycarbonate, B) polyalkylene terephthalate and C) a concentrate comprising polyalkylene terephthalate and at least one compound selected from the group consisting of ortho-phosphoric acid, phosphorous acid, carboxylic acid esters of ortho-phosphoric acid and carboxylic acid esters of phosphorous acid, Compositions of the present invention are distinguished by high melt stability. The present invention also relates to a process for the preparation of impact-modified polyalkylene terephthalate/polycarbonate compositions, wherein a concentrate of polyalkylene terephthalate with a phosphorus-containing additive is used.
    Type: Application
    Filed: March 20, 2009
    Publication date: October 1, 2009
    Applicant: Bayer MaterialScience AG
    Inventors: Pierre MOULINIE, Ralf Hufen, Stephan Konrad, Dieter Wittmann
  • Publication number: 20090215945
    Abstract: The present invention relates to an impact-modified polyalkylene terephthalate/polycarbonate composition comprising A) 41 to 97 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of aromatic polycarbonate, B) 2 to 19 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of polyalkylene terephthalate, C) 0.5 to 15 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of rubber-modified graft polymer, D) 0.5 to 25 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of a salt of a phosphinic acid, A composition of the present invention is distinguished by an optimum combination of high heat distortion temperature, good flameproofing and excellent mechanical properties (in particular high E modulus), the use of the polycarbonate compositions for the production of shaped articles and the shaped articles themselves.
    Type: Application
    Filed: December 18, 2008
    Publication date: August 27, 2009
    Applicant: BAYER MATERIALSCIENCE AG
    Inventors: Pierre MOULINIE, Vera BUCHHOLZ, Eckhard WENZ, Dieter WITTMANN
  • Publication number: 20090163629
    Abstract: The present invention relates to impact-modified polycarbonate compositions comprising A) 50 to 99.4 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C) of aromatic polycarbonate and/or aromatic polyester carbonate, B) 0.5 to 20 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C) of graft polymer containing a silicone rubber or silicone/acrylate rubber, C) 0.1 to 30 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C) of a salt of a phosphinic acid. which are distinguished by an optimum combination of good flameproofing, high heat distortion temperature, good mechanical properties and good resistance to chemicals, the use of the polycarbonate compositions for the production of shaped articles and the shaped articles themselves.
    Type: Application
    Filed: December 18, 2008
    Publication date: June 25, 2009
    Applicant: BAYER MATERIALSCIENCE AG
    Inventors: Thomas ECKEL, Vera BUCHHOLZ, Dieter WITTMANN, Eckhard WENZ
  • Patent number: 7446144
    Abstract: A thermoplastic molding composition suitable for preparing articles by thermoforming is disclosed. The molding composition that comprise A) branched, aromatic poly(ester)carbonate, B) graft polymer, C) an optional vinyl(co)polymer and or polyalkylene terephthalate, D) at least one flame retarding phosphorous compound selected from the group consisting of mono- and oligomeric phosphorus and phosphonic acid esters, phosphonate amines and phosphazenes and E) talc, is characterized in that its flexural modulus at room temperature is at least 3000 N/mm2 and that its falling dart energy at break, at ?30° C., is at least 40.0 J. Sheets extruded of the composition are suitable for making useful articles by thermoforming.
    Type: Grant
    Filed: September 14, 2005
    Date of Patent: November 4, 2008
    Assignees: Bayer MaterialScience LLC, Bayer MaterialScience AG
    Inventors: Eckhard Wenz, Pierre Moulinié, Thomas Eckel, Vera Buchholz, Dieter Wittmann, Bruce Hager, Fred J. Zaganiacz
  • Patent number: 7319116
    Abstract: A flame resistant thermoplastic molding composition having improved mechanical properties is disclosed. The composition contains polycarbonate, a graft polymer and a phosphorus compounds of formula (I): and a mixture of fluorinated polyolefins with polyalkyl (meth)acrylates.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: January 15, 2008
    Assignee: Bayer MaterialScience AG
    Inventors: Thomas Eckel, Andreas Seidel, Juan Gonzalez-Blanco, Dieter Wittmann
  • Publication number: 20070225413
    Abstract: A process for producing a three-dimensional article comprising a poly(ester)carbonate compositions characterized by its flame resistance and high impact strength is disclosed. The composition that contains branched aromatic poly(ester)carbonate, a graft polymer wherein the graft base is silicone rubber or silicone-acrylate rubber, talc, phosphorus-containing flameproofing agent, and an inorganic boron compound, and an optional anti-dripping agent satisfies enhanced fire-protection requirements.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 27, 2007
    Inventors: Vera Buchholz, Eckhard Wenz, Thomas Eckel, Burkhard Thuermer, Dieter Wittmann
  • Publication number: 20070225441
    Abstract: A flame resistant, impact-modified polycarbonate composition is disclosed. The composition that is suitable especially for preparing thermoformed articles comprises branched aromatic polycarbonate and/or branched aromatic polyester carbonate, a graft polymer containing silicone rubber or silicone acrylate rubber, talc, and a phosphorus-containing flameproofing agent, and meets high requirements in terms of fireproofing. Also disclosed is a process for the preparation of the composition and its use in the production of molded articles.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 27, 2007
    Inventors: Eckhard Wenz, Thomas Eckel, Vera Buchholz, Dieter Wittmann, Burkhard Thuermer
  • Publication number: 20070225412
    Abstract: A poly(ester)carbonate compositions characterized by its flame resistance and high impact strength is disclosed. The composition that contains branched aromatic poly(ester)carbonate, a graft polymer wherein the graft base is silicone rubber or silicone-acrylate rubber, talc, phosphorus-containing flameproofing agent, and an inorganic boron compound, and an optional anti-dripping agent satisfies enhanced fire-protection requirements.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 27, 2007
    Inventors: Vera Buchholz, Eckhard Wenz, Thomas Eckel, Burkhard Thuermer, Dieter Wittmann
  • Patent number: 7235598
    Abstract: A thermoplastic molding compositions comprising thermoplastic polycarbonate and an additive amount of an aluminum compound is disclosed. The aluminum compound is characterized by its particle size and the composition is characterized by its improved anti-static properties.
    Type: Grant
    Filed: January 24, 2000
    Date of Patent: June 26, 2007
    Assignee: Bayer MaterialScience AG
    Inventors: Michael Zobel, Thomas Eckel, Dieter Wittmann, Bernd Keller
  • Publication number: 20070142535
    Abstract: A thermoplastic molding composition that features improved thermal stability and a relatively low maximum rate of decomposition in the event of fire is disclosed. The composition contains an aromatic polycarbonate and/or polyester carbonate, and a modified layered compound, the modification with organic polymer by means of a solvent-free melt process. Optional additional components include an impact modifier, a thermoplastic (co)copolymer, and a phosphorus compound.
    Type: Application
    Filed: December 11, 2006
    Publication date: June 21, 2007
    Inventors: Eckhard Wenz, Uwe Peucker, Thomas Eckel, Dieter Wittmann, Arno Nennemann, Vera Buchholz
  • Publication number: 20070135544
    Abstract: A stabilized thermoplastic molding composition is disclosed. The composition contains A) aromatic polycarbonate and/or polyester carbonate, B) a rubber-modified graft polymer or its mixture with a rubber-free (co)polymer and C) a Bronsted acid compound. The inventive composition is characterized in its improved stability under processing conditions. Also disclosed is a process for the production of the composition and its use for the production of shaped articles.
    Type: Application
    Filed: December 5, 2006
    Publication date: June 14, 2007
    Inventors: Andreas Seidel, Dieter Wittmann, Christoph Schwemler
  • Publication number: 20070135568
    Abstract: A thermoplastic molding composition having improved properties is disclosed. The composition comprises polycarbonate resin, a first graft polymer, a first free copolymer, a second graft polymer and a second free copolymer; the weight-average molecular weight of the first free copolymer being lower by at least 32,000 g/mol with regard to that of the second free copolymer. The inventive composition features improved balance of melt flowability and ductility, good resistance to hydrolysis and process stability.
    Type: Application
    Filed: December 5, 2006
    Publication date: June 14, 2007
    Inventors: Thomas Eckel, Andreas Seidel, Dieter Wittmann
  • Patent number: 7223812
    Abstract: A thermoplastic molding composition containing talc is disclosed. The composition wherein talc has a median particle size of less than 1000 nm further contains a polycarbonate and/or polyester-carbonate, and a graft polymer having as graft base a rubber having a glass transition temperature of below about 10° C. is suitable for preparing molded articles having improved mechanical properties, such as weld line strength, elongation at break and toughness at low temperatures.
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: May 29, 2007
    Assignee: Bayer Aktiengesellschaft
    Inventors: Andreas Seidel, Marc Vathauer, Thomas Eckel, Holger Warth, Dieter Wittmann
  • Patent number: 7220790
    Abstract: A thermoplastic molding composition having good flame resistance, melt flowability, resistance to chemicals and creep is disclosed. The composition contains A) at least one member having weight average molecular weight (Mw) of 25,000 to 35,000 g/mol, selected from the group consisting of aromatic polycarbonate and polyestercarbonate B) ABS graft polymer produced by the mass polymerization process and characterized in (i) having a butadiene content of 8 to 15% in relation to the weight of the graft polymer, (ii) having an acrylic acid derivative content of 15 to 30% in relation to the total weight of the acrylic derivative and styrene monomer, and (iii) containing styrene monomer-acrylic acid derivative copolymer having a weight average molecular weight of 5·104 to 14·104 g/mol. The composition may further contain one or more of halogen-free phosphorus compounds, fluorinated polyolefin, a polymer containing acrylate monomer and an inorganic material in particulate form.
    Type: Grant
    Filed: July 25, 2003
    Date of Patent: May 22, 2007
    Assignee: Bayer Aktiengesellschaft
    Inventors: Andreas Seidel, Thomas Eckel, Dieter Wittmann, Dirk Kurzidim
  • Publication number: 20070060678
    Abstract: A thermoplastic molding composition suitable for preparing articles by thermoforming is disclosed. The molding composition that comprise A) branched, aromatic poly(ester)carbonate, B) graft polymer, C) an optional vinyl(co)polymer and or polyalkylene terephthalate, D) at least one flame retarding phosphorous compound selected from the group consisting of mono- and oligomeric phosphorus and phosphonic acid esters, phosphonate amines and phosphazenes and E) talc, is characterized in that its flexural modulus at room temperature is at least 3000 N/mm2 and that its falling dart energy at break, at ?30° C., is at least 40.0 J. Sheets extruded of the composition are suitable for making useful articles by thermoforming.
    Type: Application
    Filed: September 14, 2005
    Publication date: March 15, 2007
    Inventors: Eckhard Wenz, Pierre Moulinie, Thomas Eckel, Vera Buchholz, Dieter Wittmann, Bruce Hager, Fred Zaganiacz
  • Publication number: 20070021559
    Abstract: An impact modified thermoplastic molding composition comprising aromatic polycarbonate and/or polyester carbonate and a rubber-modified graft polymer prepared by the bulk, solution or bulk-suspension polymerization process is disclosed. The composition that is characterized by its low content of lithium ions features improved hydrolytic resistance.
    Type: Application
    Filed: July 21, 2005
    Publication date: January 25, 2007
    Inventors: Andreas Seidel, Dieter Wittmann, Bruce Hager
  • Publication number: 20060293422
    Abstract: A thermoplastic molding composition that features improved properties is disclosed. The composition contains A) aromatic polycarbonate and/or polyester carbonate, B) polyalkylene terephthalate, C) graft polymer, D) an oligomeric phosphorus compound of formula (I), in which R1, R3, R4 independently of each other mean C1-C8 alkyl, C5-C6-cycloalkyl, C6-C10-aryl or C7-C12 aralkyl, n independently of each other mean 0 or 1, q mean 0.5 to 15, and optionally E) fluorinated polyolefin.
    Type: Application
    Filed: July 15, 2005
    Publication date: December 28, 2006
    Inventors: Andreas Seidel, Thomas Eckel, Dieter Wittmann
  • Patent number: 7144935
    Abstract: A flame resistant poly(ester)carbonate composition is disclosed. The composition contains at least one phosphorus-silicon compound, the compound has a phosphorus content of 1 to 20% and a silicon content of 1 to 20%, and is characterized in that its weight loss (assessed by thermogravimetric analysis under nitrogen inert gas at a heating rate of 20° K/min,) at 280° C. is less than 30%. The preferred phosphorus-silicon compound is produced by thermal oligomerization from phosphorylated silanes.
    Type: Grant
    Filed: December 3, 2003
    Date of Patent: December 5, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Andreas Seidel, Michael Wagner, Jochen Endtner, Wolfgang Ebenbeck, Thomas Eckel, Dieter Wittmann