Patents by Inventor Tibor Krakkay

Tibor Krakkay 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).

  • Process for preparation of acrylonitrile polymers with low K value
    Patent number: 4977225
    Abstract: The invention relates to homopolymers and copolymers of acrylonitrile with very low Fikentscher K values of 34-15 and a total content of sulfonate and sulfate end groups, which do not originate from correspondingly substituted comonomers, of 250 to 1,000 milliequivalents per kilogram of polymer, 180 to 900 milliequivalents per kilogram being in the form of sulfonate end groups, and to suitable semi-continuous or continuous precipitation polymerization processes for their preparation by means of a redox system in an aqueous medium.The resulting polymers can be extruded to shaped articles. In particular, after hydrolysis, they can be used as emulsifiers and deep bore auxiliaries.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: December 11, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Tibor Krakkay, Tatjana Poggi, Ernst Schubert
  • Polyacrylonitriles with a low K value, a process for their preparation and their suitable use
    Patent number: 4759853
    Abstract: A method of inhibiting scale formation or precipitation in an aqueous alkaline-earth salt solution with an aqueous solution of a hydrolyzed polyacrylonitrile salt made by heating homopolymers and copolymers of acrylonitrile with very low Fikentscher K values of 34-15 and a total content of sulfonate and sulfate end groups, which do not originate from correspondingly substituted comonomers, of 250 to 1,000 milliequivalents per kilogram of polymer, 180 to 900 milliequivalents per kilogram being in the form of sulfonate end groups, and to suitable semi-continuous or continuous precipitation polymerization process for their preparation by means of a redox system in an aqueous medium.
    Type: Grant
    Filed: June 26, 1987
    Date of Patent: July 26, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Tibor Krakkay, Tatjana Poggi, Ernst Schubert
  • Polyacrylonitriles with a low K value, a process for their preparation and their suitable use
    Patent number: 4683286
    Abstract: The invention relates to homopolymers and copolymers of acrylonitrile with very low Fikentscher K values of 34-15 and a total content of sulfonate and sulfate end groups, which do not originate from correspondingly substituted comonomers, of 250 to 1,000 milliequivalents per kilogram of polymer, 180 to 900 milliequivalents per kilogram being in the form of sulfonate end groups, and to suitable semi-continuous or continuous precipitation polymerization processes for their preparation by means of a redox system in an aqueous medium.The resulting polymers can be extruded to shaped articles. In particular, after hydrolysis, they can be used as emulsifiers and deep bore auxiliaries.
    Type: Grant
    Filed: February 21, 1986
    Date of Patent: July 28, 1987
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Tibor Krakkay, Tatjana Poggi, Ernst Schubert
  • Polyacrylonitriles with a low K value
    Patent number: 4673721
    Abstract: The invention relates to homopolymers and copolymers of acrylonitrile with very low Fikentscher K values of 34-15 and a total content of sulfonate and sulfate end groups, which do not originate from correspondingly substituted comonomers, of 250 to 1,000 milliequivalents per kilogram of polymer, 180 to 900 milliequivalents per kilogram being in the form of sulfonate end groups, and to suitable semi-continuous or continuous precipitation polymerization processes for their preparation by means of a redox system in an aqueous medium.The resulting polymers can be extruded to shaped articles. In particular, after hydrolysis, they can be used as emulsifiers and deep bore auxiliaries.
    Type: Grant
    Filed: March 13, 1986
    Date of Patent: June 16, 1987
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Tibor Krakkay, Tatjana Poggi, Ernst Schubert