| abstract |
The invention relates to pigmentary solid solutions comprising copper phthalocyanine (Pigment Blue 15; C.I. 74160) as host and other blue to violet pigments as guests. Preferred hosts are the α (Pigment Blue 15:1), β (Pigment Blue 15:3) and ε (Pigment Blue 15:6) crystal forms of copper phthalocyanine, especially the ε crystal form. Monophase solid solutions are preferred. n The invention also relates, furthermore, to dispersions comprising these solid solutions as pigment particles, and pigment derivatives as rheology improvers. Preferred dispersions of solid solutions in the ε crystal lattice may be used in particular to prepare color filters for liquid-crystal displays (LCDs) which in comparison to existing color filters have an improved transmission window at about 445 nm. n Also claimed are a process for preparing the dispersions of the invention, the solid solutions themselves, and the use thereof to pigment high molecular mass organic materials. |