Patents by Inventor Konstadinos Douzinas

Konstadinos Douzinas 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).

  • Method for hydrogenating aromatic polymers in the presence of special catalysts
    Patent number: 6841626
    Abstract: A process for hydrogenating aromatic polymers is disclosed. The process entails using a supported catalyst wherein support contains alumina and where the catalyst comprise at least one metal of subgroup VIII of the Periodic Table. The catalyst is characterized in that the pore volume of the pores having diameters of 1000 to 10,000 Angstrom is 15 to 100% relative to the total pore volume, as determined by mercury porosimetry.
    Type: Grant
    Filed: January 26, 2000
    Date of Patent: January 11, 2005
    Assignees: Bayer Aktiengesellschaft, Teijin Limited
    Inventors: Volker Wege, Konstadinos Douzinas, Johann Rechner
  • Vinylcyclohexane—based polymer/copolymer mixture and stabilizer system
    Patent number: 6803397
    Abstract: A thermoplastic molding composition containing a (co)polymer of vinylcyclohexane and a stabilizer system is disclosed. The stabilizer system contains lactone, sterically hindered phenol and a phosphite compound. The composition that is characterized by its improved thermal stability is suitable for the preparation of molded articles, including optical data carriers.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: October 12, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Wege, Konstadinos Douzinas, Friedrich-Karl Bruder
  • Polymers based on vinylcyclohexane
    Publication number: 20040072980
    Abstract: Polymers of vinylcyclohexane with an absolute molecular weight Mw from 100,000 to 450,000 g/mol or a mixture thereof with a low molecular weight component with an absolute molecular weight from 1000 to less than 100,000 g/mol, wherein the molecular weight distribution is characterised by a polydispersity index of 1 to 3 and the maximum melt viscosity is 1000 Pa.s, as measured at 300° C. and at a shear rate of 1000 sec−1.
    Type: Application
    Filed: September 24, 2003
    Publication date: April 15, 2004
    Inventors: Volker Wege, Friedrich-Karl Bruder, Konstadinos Douzinas, Yun Chen
  • Vinylcyclohexane-based polymers
    Patent number: 6649723
    Abstract: A molding composition comprising a (co)polymer of vinylcyclohexane is disclosed. The copolymer is characterized in having an absolute molecular weight Mw of 100,000 to 450,000 g/mol, polydispersity index of 1 to 3 and maximum melt viscosity of 1000 Pa·s, as measured at 300° C. and at a shear rate of 1000 sec−1. The composition is suitable for producing a variety of molded article most notably optical data storage media.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: November 18, 2003
    Assignees: Bayer Aktiengesellschaft, Teijin Ltd.
    Inventors: Volker Wege, Friedrich-Karl Bruder, Konstadinos Douzinas, Yun Chen
  • Thermoplastic multi-layered film with a layer of vinylcyclohexane-based polymer
    Publication number: 20030099837
    Abstract: This invention relates to a multilayer film comprising a layer which contains a vinylcyclohexane-based polymer or mixtures thereof and at least one further layer. The multilayer film is distinguished by elevated water vapour barrier action and low oxygen permeability.
    Type: Application
    Filed: September 20, 2002
    Publication date: May 29, 2003
    Inventors: Dirk Mockel, Miroslav Marek, Volker Wege, Friedrich-Karl Bruder, Konstadinos Douzinas
  • Vinycyclohexane-based single layer films
    Publication number: 20030027937
    Abstract: Monofilms containing a vinylcyclohexane-based polymer or a mixture of vinylcyclohexane-based polymers with at least one polar polymer.
    Type: Application
    Filed: June 19, 2002
    Publication date: February 6, 2003
    Inventors: Dirk Mockel, Volker Wege, Friedrich-Karl Bruder, Konstadinos Douzinas
  • Branching of polyamides with esters of carbonic acid
    Patent number: 6498217
    Abstract: A branched polyamide and a process for its preparation are disclosed. Aliphatic or aromatic esters of carbonic acid are used as branching agents in an optionally catalyzed reaction with crystalline polyamide to produce resins having good flow properties, high degree of crystallinity and excellent mechanical properties. Amorphous polyamides that are branched in accordance with the inventive process have improved flow properties.
    Type: Grant
    Filed: August 10, 2000
    Date of Patent: December 24, 2002
    Assignee: Bayer Aktiengesellshaft
    Inventors: Miroslav Marek, Friedrich-Karl Bruder, Konstadinos Douzinas
  • Vinylcyclohexane-based block copolymers
    Patent number: 6492468
    Abstract: The present invention relates to block copolymers which are predominantly based on vinylcyclohexane and to a process for producing them. The block copolymers can be processed to form mouldings by extrusion or injection moulding. The mouldings which result therefrom are distinguished by their high resistance to thermal deformation, good mechanical properties, high transparency in the visible and near UV range, and by their particularly low birefringence and water absorption.
    Type: Grant
    Filed: May 22, 2001
    Date of Patent: December 10, 2002
    Assignees: Bayer Aktiengesellschaft, Teijin Ltd.
    Inventors: Yun Chen, Friedrich-Karl Bruder, Volker Wege, Konstadinos Douzinas, Ralf Dujardin