Pigmentary synthesis of quinacridone solid solutions

Details Pigmentary synthesis of quinacridone solid solutions Pigmentary synthesis of quinacridone solid solutions

C - Chemistry, Metallurgy

09

B

C09B 48/00 (2006.01) C09B 67/22 (2006.01)

Patent

CA 2131946

Pigmentary synthesis of quinacridone solid solutions Abstract of the Disclosure A general method for the direct preparation of pigmentary quinacridone solid solutions is disclosed. The disclosed process comprises oxidizing a mixture of dihydroquinacridones directly to a pigmentary quinacridone solid solution wherein the oxidation is carried out by heating a reaction mixture comprising the dihydroquinacridone mixture, an alkali metal hydroxide, a water miscible organic solvent, water and effective amounts of an oxidizing agent and a particle growth inhibitor. In addition, an analogous process useful for the direct pigmentary synthesis of .alpha.-quinacridone is disclosed. The pigments prepared by the disclosed processes do not require additional particle-size reducing aftertreatments in order to be useful as pigments.

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