Patents Assigned to Spezial-Papiermaschinenfabrik August Alfred Krupp GmbH & Co.
  • Patent number: 4379721
    Abstract: The present invention relates to a pressure-sensitive recording material ing improved storability, lightfastness and heat resistance, which comprises a unit containing a dye precursor or its solution and a unit containing a dye acceptor material which is capable of color formation by reaction with the dye precursor. The pressure-sensitive recording material according to the invention is characterized in that the dye acceptor material is an intimate mixture comprising(a) a 2-hydroxy-benzophenone of the general formula I ##STR1## or 3,5,7,3',4'-pentahydroxy-flavone of the formula II ##STR2## (b) a substituted benzotriazole of the general formula III ##STR3## and, optionally, an inert waxy binder. The invention further relates to further embodiments of this recording material with improved properties as well as process for producing the pressure-sensitive recording materials according to the invention.
    Type: Grant
    Filed: March 9, 1981
    Date of Patent: April 12, 1983
    Assignee: Spezial-Papiermaschinenfabrik August Alfred Krupp GmbH & Co.
    Inventors: Marion Qualitz, Viktor A. Krupp