| 摘要 |
The present invention relates to anthraquinone compounds of formula I, <IMAGE> I in which R1 is alkyl or cycloalkyl, R2 is hydrogen, methyl or ethyl, R3 is hydrogen or methyl, either R4 is hydrogen, methyl or ethyl, and Y-CO- is the radical of an organic aliphatic aromatic or araliphatic carboxylic acid containing a total of 2 to 12 carbon atoms, or R4 together with the radical Y-CO- and the nitrogen atom to which they are bound signify a cyclic imide of a dicarboxylic acid containing a total of 4 to 8 carbon atoms, X is a direct bond or (C1-3)alkylene, n is 0 or 1 which compounds are useful as colorants. More particularly those compounds where n is 1 are useful as anionic dyestuffs and those compounds where n is 0 are useful as pigments.
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