Patents by Inventor Jurgen Kadelka

Jurgen Kadelka 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).

  • Highly viscous polyamide for use in extrusion blow molding
    Publication number: 20030092822
    Abstract: The invention relates to thermoplastic molding materials that are produced from a mixture containing an aliphatic polyanmide and/or copolyamide, fillers and reinforcement agents, bifunctional or multifunctional additives that induce branching and/or polymer chain extension, a modifier and other additives that do not induce branching and/or polymer chain extension.
    Type: Application
    Filed: September 5, 2002
    Publication date: May 15, 2003
    Inventors: Detlev Joachimi, Helmut Schulte, Wolfram Littek, Jurgen Kadelka
  • Use of carbonates as demoulding agents for thermoplastic polycarbonates
    Patent number: 5726228
    Abstract: The present invention relates to the use of cyclic carbonates as demoulding agents for thermoplastic polycarbonates, and to the incorporation of these cyclic carbonates into the thermoplastic polycarbonates.
    Type: Grant
    Filed: December 3, 1996
    Date of Patent: March 10, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ralf Kaufmann, Wolfgang Ebert, Hartmut Lower, Jurgen Kadelka, Claus Wulff, Gottfried Zaby
  • Process for the preparation of polycarbonates
    Patent number: 5508375
    Abstract: The present invention relates to a process for the preparation of polycarbonates in which an oil-in-water emulsion is maintained throughout by employing special reaction conditions.
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: April 16, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Hucks, Jurgen Kadelka, Wolfgang Herrig
  • Process for the production of polycarbonate of constant viscosity
    Patent number: 5412060
    Abstract: The invention relates to a process for the production of polycarbonates by the two-phase interfacial method in which deviations between measured and estimated variables are continuously minimized by means of a suitably selected observer or filter system on the basis of a process model with an empirical Mark-Houwink relation adapted to the process. The variables estimated by the observer/filter are converted into control variables which are used to set input streams of the production process. Product quality is kept constant, changes in load or set values are quickly intercepted and even disturbances not readily accessible to measurement are taken into account by the process control.
    Type: Grant
    Filed: January 31, 1994
    Date of Patent: May 2, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Claus Wulff, Uwe Hucks, Rolf Bachmann, Gunther Weymans, Jurgen Kadelka, Wolfgang Herrig
  • Process for the preparation of polycarbonates
    Patent number: 5376741
    Abstract: The present invention relates to a process for the preparation of polycarbonates in which an oil-in-water emulsion is maintained throughout by carrying out the reaction under special conditions.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: December 27, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Herrig, Jurgen Kadelka, Uwe Hucks
  • Production of ultrafine suspensions of bisphenol, sodium hydroxide and water
    Patent number: 5275758
    Abstract: The invention relates to ultrafine suspensions of bisphenol, sodium hydroxide and water for the production of polycarbonates by the two-phase interfacial process. According to the invention, these suspensions are prepared by cooling bisphenolate concentrations near the solubility limit in aqueous sodium hydroxide with intensive mixing at relatively high temperatures and precipitating bisphenolate or more bisphenolate in the form of fine droplets during the cooling process. The ultrafine suspensions provide for a high volume/time yield in the interfacial reaction.
    Type: Grant
    Filed: September 1, 1992
    Date of Patent: January 4, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Claus Wulff, Reinhard Schomacker, Jurgen Kadelka, Jurgen Heuser, Gunther Weymans, Konrad Hable
  • Process for the preparation of substituted succinic acid amides
    Patent number: 4588833
    Abstract: Substituted succinic acid amides, in particular substituted succinic acid amides containing differing derivative groups, are prepared by reacting unsaturated carboxamides with carbon monoxide and with a nucleophilic component containing at least one mobile hydrogen atom, in the presence of cobalt compounds and, if appropriate, in the presence of one or more tertiary nitrogen bases, under an elevated pressure and at an elevated temperature.
    Type: Grant
    Filed: October 26, 1984
    Date of Patent: May 13, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Kadelka, Hans-Helmut Schwarz