Patents by Inventor Hartmut Bucka

Hartmut Bucka 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: 6815545
    Abstract: A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH3, introduced into the reactor from below, and emerges from the central pipe in the upper part of the central pipe. Part of the melamine formed flows downward in the annular space between the central pipe and reactor wall, and the remainder is expelled for further work-up. The off-gases are removed at the top of the reactor. A reactor for carrying out the process is also provided.
    Type: Grant
    Filed: October 7, 2003
    Date of Patent: November 9, 2004
    Assignee: Agrolinz Melamin GmbH
    Inventors: Hartmut Bucka, Gerhard Coufal, Ferdinand Koglgruber
  • Publication number: 20040054175
    Abstract: A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH3, introduced into the reactor from below, and emerges from the central pipe in the upper part of the central pipe. Part of the melamine formed flows downward in the annular space between the central pipe and reactor wall, and the remainder is expelled for further work-up. The off-gases are removed at the top of the reactor. A reactor for carrying out the process is also provided.
    Type: Application
    Filed: October 7, 2003
    Publication date: March 18, 2004
    Inventors: Hartmut Bucka, Gerhard Coufal, Ferdinand Koglgruber
  • Publication number: 20040049034
    Abstract: A process for preparing melamine by pyrolysis of urea in a high-pressure process, in which urea is reacted together with NH3 to give melamine and the melamine melt formed is fed together with further urea to a cooling reactor, with the melt being cooled to a temperature which is 1-50° C., preferably 1-30° C., above the melting point of the melamine, which is dependent on the prevailing NH3 pressure. Introduction of NH3 in countercurrent drives out the CO2 formed, after which the melamine melt is worked up in any appropriate way.
    Type: Application
    Filed: September 25, 2003
    Publication date: March 11, 2004
    Inventors: Gerhard Coufal, Hartmut Bucka, Faramarz Bairamijamal
  • Patent number: 6433109
    Abstract: Modified polypropylenes of improved processability are produced by a continuous method by absorptively charging polypropylene particles at 20° to 120° C. with a gas mixture, which contains oxygen and bifunctional, unsaturated monomers, and melting the mixture. The modified polypropylenes of improved processability as well as mixtures with unmodified polypropylenes are suitable for the production of films, sheets, fibers, panels, coatings, pipes, hollow objects and foamed materials.
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: August 13, 2002
    Assignee: Borealis GmbH
    Inventors: Manfred Raetzsch, Hartmut Bucka, Achim Hesse, Ulf Panzer, Norbert Reichelt
  • Patent number: 6388020
    Abstract: Structurally isomeric poly(alkyl ethylenes) with H and Y structures, polymeric bridging segments and a Y index of 2×10−3 to 8×10−3 (kJ/mole/degree), have decreased instability in the melt and more advantageous processing properties. The structurally isomeric poly(alkyl ethylenes) with H and Y structures are synthesized by an irradiating method, a melt reaction method or a solid phase reaction method by reacting poly(alkyl ethylenes) with 0.05 to 5% by weight of monofunctional, difunctional and polyfunctional monomers, optionally in the presence of peroxides. The structurally isomeric poly(alkyl ethylenes) are suitable for producing films, sheets, panels, coatings, pipes, hollow objects and foams.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: May 14, 2002
    Assignee: Borealis GmbH
    Inventors: Manfred Raetzsch, Achim Hesse, Hartmut Bucka, Norbert Reichelt, Ulf Panzer, Konrad Buehler
  • Patent number: 6310140
    Abstract: Thermoplastic elastomers of good dyeability and high strength and elasticity, the incorporated elastomeric particles of which have and average particle diameter of 0.05 to 5 &mgr;m. The thermoplastic elastomers are formed according to a method in which mixtures of propylene homopolymers and/or propylene copolymers, elastomeric C4 C12 olefin copolymers and/or terpolymers and C8 to C14 diacrylates, C7 to C16 diallyl compounds, C9 to C15 dimethacrylates, C7 to C10 divinyl compounds, C12 to C17 acrylate esters of polyalcohols, C15 to C21 methacrylate esters of polyalcohols and/or C9 C12 triallyl compounds are added to a melt. The thermoplastic elastomers, as well as mixtures of the thermoplastic elastomers with conventional polyolefins, are suitable for use in the vehicle industry, in the domestic appliances industry, in the construction industry and in medical technology.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: October 30, 2001
    Assignee: Borealis GmbH
    Inventors: Manfred Raetzsch, Norbert Reichelt, Achim Hesse, Hartmut Bucka, Matthias Stolp, Hans-Joachim Radusch
  • Publication number: 20010016628
    Abstract: Structurally isomeric poly(alkyl ethylenes) with H and Y structures, polymeric bridging segments and a &PSgr; index of 2×10−3 to 8×10−3 (kJ/mole/degree), have decreased instability in the melt and more advantageous processing properties.
    Type: Application
    Filed: January 27, 1997
    Publication date: August 23, 2001
    Inventors: MANFRED RAETZSCH, ACHIM HESSE, HARTMUT BUCKA, NORBERT REICHELT, ULF PANZER, KONRAD BUEHLER
  • Patent number: 6242525
    Abstract: Thermoplastic elastomers of high strength, high elasticity and good dyeability, the incorporated elastomeric particles of which have an average particle diameter of 0.05 to 5 &mgr;m, from propylene homopolymers and/or propylene copolymers, elastomeric C2 to C8 olefin copolymers and/or terpolymers and multifunctional, unsaturated monomers are formed by a method, for which mixtures of propylene homopolymers and/or propylene copolymers, elastomeric C2 to C8 olefin copolymers and/or terpolymers and readily volatile C4 to C7 dienes are reacted in the melt. The thermoplastic elastomers, as well as mixtures with conventional polyolefins, are suitable for use in the vehicle industry, in the domestic appliances industry, in the building sector and in medical technology.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: June 5, 2001
    Assignee: Borealis GmbH
    Inventors: Manfred Raetzsch, Achim Hesse, Norbert Reichelt, Hartmut Bucka, Hermann Heinemann, Matthias Stolp, Hans-Joachim Radusch
  • Patent number: 6225366
    Abstract: Polyolefin foam materials of high dimensional stability at elevated temperatures are produced from modified polypropylenes and unmodified polypropylenes. The modified polypropylenes used are produced by mixing polypropylene particles with thermally decomposing free radical-forming agents, absorbing readily volatile bifunctional monomers and heating and melting the mixture. Areas of application for the polyolefin foam materials of high dimensional stability at elevated temperatures are the packaging sector, motor vehicle parts, sports and leisure equipment, industrial applications, as well as applications in the building sector.
    Type: Grant
    Filed: May 7, 1998
    Date of Patent: May 1, 2001
    Assignee: Borealis AG
    Inventors: Manfred Raetzsch, Hartmut Bucka, Achim Hesse, Ulf Panzer, Norbert Reichelt
  • Patent number: 6204348
    Abstract: Modified polypropylenes of improved processability are produced by a continuous method by absorptively charging polypropylene particles at 20° to 120° C. with a gas mixture, which contains oxygen and bifunctional, unsaturated monomers, and melting the mixture. The modified polypropylenes of improved processability as well as mixtures with unmodified polypropylenes are suitable for the production of films, sheets, fibers, panels, coatings, pipes, hollow objects and foamed materials.
    Type: Grant
    Filed: May 7, 1998
    Date of Patent: March 20, 2001
    Assignee: Borealis GmbH
    Inventors: Manfred Raetzsch, Hartmut Bucka, Achim Hesse, Ulf Panzer, Norbert Reichelt
  • Patent number: 5962594
    Abstract: Segmented polyolefins, which are produced by the reaction of mixtures of powdery polyolefins and polyolefin granulates with unsaturated monomers in the presence of thermally decomposing free radical-forming agents in continuous mixers in two consecutive reaction steps in the solid phase, a reaction step in a solid phase/melt transition phase and a melt homogenizing step, have a high strength and tenacity.The segmented polyolefins, as well as mixtures with conventional polyolefins, are suitable for the production of films, sheets, fibers, panels, coatings, pipes, hollow objects and foams.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: October 5, 1999
    Assignee: Borealis AG
    Inventors: Manfred Raetzsch, Hartmut Bucka, Achim Hesse, Norbert Reichelt
  • Patent number: 5929127
    Abstract: Fine-celled polyolefin foams of high dimensional stability at elevated temperatures and high stiffness, with foam densities ranging from 10 to 600 kg/m.sup.3, consisting of mixtures of polypropylenes and polyolefins, which were reacted with bifunctional, unsaturated monomers and/or hydrolyzable, ethylenically unsaturated organosilane compounds in the presence of thermally decomposing free radical-forming agents in two reactive process steps and subsequently foamed. The fine-celled polyolefin foams are suitable for use in the packaging sector, preferably for packaging foods, for external and internal parts of motor vehicles and for components of electric and electronic equipment.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: July 27, 1999
    Assignee: Borealis AG
    Inventors: Manfred Raetzsch, Hartmut Bucka, Ulf Panzer, Achim Hesse, Norbert Reichelt, Dirk Leistner
  • Patent number: 5883151
    Abstract: Polypropylene mixtures of increased stress-crack resistance and melt strength can be produced by irradiating polypropylene powders with low average particle diameters by low energy electron-beam accelerators with energies of 150 to 300 keV. The polypropylene mixtures produced are suitable particularly for producing films, sheets, panels, coatings, pipes, hollow objects and foamed materials.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: March 16, 1999
    Assignee: PCD Polymere Ges. m.b.H.
    Inventors: Manfred Raetzsch, Achim Hesse, Hartmut Bucka, Norbert Reichelt, Ulf Panzer, Reiner Mehnert
  • Patent number: 5585435
    Abstract: Process for the preparation of grafted polyolefins in a fluidized bed fluidized by means of steam and, if appropriate, alcohols.
    Type: Grant
    Filed: September 25, 1995
    Date of Patent: December 17, 1996
    Assignee: PCD Polymere Gesellschaft m.b.H.
    Inventors: Manfred R atzsch, Achim Hesse, Hartmut Bucka