Dimethine compounds of the coumarin series, a process for their preparation and their use as luminous dyestuffs
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United States of America Patent
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May 24, 1983
Grant Date -
N/A
app pub date -
Aug 27, 1981
filing date -
Sep 3, 1980
priority date (Note) -
Expired
status (Latency Note)
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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.
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