Patents by Inventor Berthold Keggenhoff

Berthold Keggenhoff 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).

  • Use of an apparatus for continuous photopolymerization
    Patent number: 4211751
    Abstract: For photopolymerization, glass cylinders through which a mechanically stirred stream of ethylinically unsaturated monomeric material continually flows are irradiated from the exterior with light which initiates polymerization.
    Type: Grant
    Filed: February 23, 1978
    Date of Patent: July 8, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Berthold Keggenhoff, Eberhard Bandtel, Hans J. Rosenkranz
  • Bulk photo polymerization process for esters of acrylic and methacrylic acids
    Patent number: 4141806
    Abstract: Ethylenically unsaturated monomers are polymerized in bulk in the presence of from 0 to 10% by weight of a photoinitiator by irradiation of UV light(a) in a first reaction stage at or below the boiling point of the reaction mixture, up to a conversion of 40 - 80% by weight, and(b) in a second reaction stage, at a temperature which has been raised by from 20 to 120.degree. C and is above the glass transition temperature of the resulting polymer, up to a conversion of above 90% by weight, the percentages in each case relating to the total amount of monomer.
    Type: Grant
    Filed: January 3, 1977
    Date of Patent: February 27, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Berthold Keggenhoff, Hans J. Rosenkranz, Hans Rudolph