Patents Examined by H. M. S.g17 Sneed
  • Method for the production of modified pitches and the further application
    Patent number: 4943365
    Abstract: Contrary to known alkylation of pitches, it is disclosed that pitches are modified with particular aromatically substituted and activated C.sub.1 to C.sub.4 alkyl groups. The resulting modified pitches are easily polycondensed and give high coking residues and good mesophase formation. This is achieved on the one hand by dispensing with catalysts, which can be only incompletely removed from the pitch and, on the other hand, by employing reactive short chain alkyl aromatic compounds.
    Type: Grant
    Filed: March 9, 1987
    Date of Patent: July 24, 1990
    Assignee: Rutgerswerke AG
    Inventors: Winfried Boenigk, Maximilian Zander, Jurgen Stadelhofer