Patents Examined by Chables F. Warren
  • Heterocyclic azo dyes
    Patent number: 4820809
    Abstract: Novel compounds of the general formula I ##STR1## where X is hydrogen, nitro or unsubstituted or substituted alkyl, alkenyl, cycloalkyl, aryl or hetaryl, Y is cyano, nitro, alkanoyl, aroyl, alkylsulfonyl, arylsulfonyl, carboxyl, a carboxylic ester group or unsubstituted or substituted carbamyl, R is unsubstituted or substituted alkyl or aryl, R.sup.1 is hydrogen or R.sup.2, and R.sup.2 is unsubstituted or substituted alkyl, alkenyl, cycloalkyl, aralkyl or aryl, are useful for dyeing textile fibers, in particular polyesters.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: April 11, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Udo Bergmann, Erwin Hahn, Guenter Hansen