| 摘要 |
<p>Azo pigments of the formula WHEREIN R1 denotes an aromatic radical, R4 denotes a cyclic radical of aromatic character, R2 denotes a naphthalene radical in which the azo, hydroxyl and -CO group are in the 1,2,3-position, R3 denotes an arylene radical and R5 denotes an alkyl or aryl group or a hydrogen atom, are useful for coloring plastics and lacquers in orange ro red shades of excellent fastness properties.</p> |
