Patents Assigned to Hoechst Atiengesellschaft
  • Benzoxazole derivatives, process for their preparation and their use as optical brighteners
    Patent number: 4048185
    Abstract: Compounds of the general formula I ##STR1## in which R represents hydrogen or a lower alkyl radical which may be further substituted, n is an integer of from 1 to 4, and which may contain further non-chromophoric substituents. They are prepared by reaction of the dichloride of naphthalene-1,4-dicarboxylic acid with an o-aminophenol and subsequent ring closure. These compounds can be used as optical brighteners.
    Type: Grant
    Filed: June 8, 1976
    Date of Patent: September 13, 1977
    Assignee: Hoechst Atiengesellschaft
    Inventors: Ulrich Pintschovius, Erich Schinzel, Gunter Rosch