Preparation of pigmentary 2,9-dichloroquinacridone

Details Preparation of pigmentary 2,9-dichloroquinacridone Preparation of pigmentary 2,9-dichloroquinacridone

C - Chemistry, Metallurgy

09

B

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

Patent

CA 2131943

Preparation of pigmentary, 2,9-dichloroquinacridone Abstract of the Disclosure A process for the direct preparation of pigmentary 2,9-dichloroquinacridone, which comprises oxidizing 2,9-dichloro-6,13-dihydroquinacridone directly to pigmentary 2,9-di- chloroquinacridone by heating a reaction mixture comprising 2,9-dichloro-6,13-dihydro- quinacridone, an alkali metal hydroxide, a water-soluble organic solvent, water and effec- tive amounts of an oxidizing agent and a phthalimidomethylquinacridone particle growth inhibitor. The process yields pigmentary 2,9-dichloroquinacridone directly; without the need for additional particle-size reducing aftertreatments.

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