| abstract |
Pigment compositions containing organic pigments with an outstanding migration-free property and an excellent rheology at high concentration, and derivatives thereof containing heterocyclic substituents. The pigment compositions contains (a) carbon black or an organic pigment containing a chromophore Q 1 of the following formula, n nwherein Z 1 and Z 2 are O or N—, C· is a carbon atom with an electron in a p orbital, and n is an integer from 1 to 4; and (b) a compound containing a chromophore of the following formula (II),n n nwherein Q 2 is an m-valent residue of carbon black or of the chromophore Q 1 ; G 1 is preferablyn n nand R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 8 are preferably all H; m is an integer from 1 to 4. The pigment compositions can be used as rheology modifiers, preferably for pigmented coating compositions. |