Halogen Containing Patents (Class 552/281)
  • Fluorescent dyes
    Patent number: 6215008
    Abstract: Fluorescent dyes which fluoresce a variety of colors are prepared from substituted isoviolanthrone and substituted isoviolanthrone by reductive alkylation with alkyl halides in the presence of zinc.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: April 10, 2001
    Assignee: Rohm and Haas Company
    Inventor: Peter J. Heffron
  • Preparation of chlorinated violanthrones or isoviolanthrones
    Patent number: 5554774
    Abstract: Chlorinated violanthrones or isoviolanthrones are prepared by reacting violanthrone or isoviolanthrone with chlorine in the presence of a diluent, using aliphatic carboxylic acids and/or aliphatic halo carboxylic acids as diluent for this purpose.
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: September 10, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Udo Bergmann, Gerhard Sch afer, Heinrich Kowarsch
  • Vat dyes
    Patent number: 5334734
    Abstract: Vat dyes for dyeing and printing cellulose material have the formula ##STR1## where P=pyranthrone structure, A=1,4-or 1,5-anthraquinonyl, V=a violanthronyl or isoviol-anthronyl radical which may carry up to 2 chlorine or bromine atoms as substitutents, R=hydrogen, the acyl radical of an aliphatic C.sub.1 -C.sub.6 -carboxylic acid or the acyl or sulfonyl radical of an aromatic carboxylic or sulfonic acid, Hal=chlorine or bromine, m=from 0 to 3, n=from 1 to 4, and p=from 0 to 3, with the proviso that the sum m+n+p is not greater than 4.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: August 2, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Matthias Niedenbrueck, Manfred Patsch