| 摘要 |
There are described organic-inorganic ternary composite pigments consisting of 70%-90% by weight of an inorganic binary titanium dioxide/aluminum hydrate component and, from 10% to 30% by weight, of a co-precipitated organic component consisting of an organic dye, containing in its structure at least one carboxylic and/or sulphonic acid function, having the formula: <IMAGE> (I) wherein R1 is selected from the group consisting of NO2 -SO3H and -COOH; R2 is selected from the group consisting of NO2, -SO3H, alkyl and alkoxyl; R3 is selected from the group consisting of H, halogen and alkyl; R4 and R5 are each selected from the group consisting of H, halogen, alkyl and alkoxyl; R6 is selected from the group consisting of H, halogen and alkoxyl; and wherein the -COOH and/or -SO3H group of dye (I) is salified with metal cations. The pigments are obtained by co-precipitation acidifying an aqueous solution and/or dispersion of acid dye (I) in sodium aluminate, in the presence of TiO2, maintained at 40 DEG -80 DEG C. and at pH=9.5-10.5, by then treating it with any aqueous solution of an alkaline-earth (Ca, Ma, Al, Ba, Sr) salt or of Mn or Zn.
|
