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 (II) 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
+
.
制备公式(I)或其互变异构体和
水合物的
颜料的过程,其中含有
三聚氰胺或
三聚氰胺衍
生物作为客体,其特征在于在存在公式(III)的游离偶氮基尿
嘧啶酸的情况下,将公式(II)的偶氮基杂
咪唑单盐与
镍化合物和
三聚氰胺或
三聚氰胺衍
生物反应,其中阳离子C1⊕为任意所需的一价阳离子或相应于正电荷为1的任意所需多价阳离子的分数,但不包括H+。