Nitrogen Bonded Directly To The Bicyclo Ring System Patents (Class 549/288)
  • Dimethine compounds of the coumarin series, a process for their preparation and their use as luminous dyestuffs
    Patent number: 4384973
    Abstract: Dimethine compounds of the coumarin series of the general formula ##STR1## with the substituent meanings given in the description are used for dyeing synthetic fibre materials, in particular those of polyester, polyamide, polyurethanes, polypropylene and polyacrylonitrile. Clear, luminous-red dyeings of high brilliancy are obtained. The dyestuffs can also be used as laser dyestuffs and as energy converters in light-collecting systems.
    Type: Grant
    Filed: August 27, 1981
    Date of Patent: May 24, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventor: Horst Harnisch