Fluorescent yellow 1,2,3,4-Tetrachloro-11H-Isoindolo-?2,1-A!-Benzimidazol-11-one pigments
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United States of America Patent
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Jan 5, 1999
Issued Date -
N/A
app pub date -
Nov 16, 1993
filing date -
May 8, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Fluorescent yellow pigments comprising 1,2,3,4-tetrachloro-11H-isoindolo-?2,1-a!-benzimidazol-11-one and various derivatives thereof; the use of said pigments in a variety of substrates such as alkyds, enamels, inks and the like; a process for the preparation thereof involving the condensation of the appropriate o-phenylenediamine and tetrachlorophthalic anhydride; and the aforementioned novel derivatives of said compound.
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