| 摘要 |
<p>Process for preparing pigments of the formula (I) or tautomeric structures thereof and their hydrates, containing melamine or melamine derivatives as guest(s), characterized in that the azobarbituric mono-salt of the formula (IT) is reacted with a nickel compound and melamine or a melamine derivative in the presence of the free azobarbituric acid of the formula (III), the cation C1 is any desired univalent cation or the fraction of any desired multivalent cation that corresponds to a positive charge of one, except for H+.</p> |
