Process for preparing a substantially pure gamma phase...

Details Process for preparing a substantially pure gamma phase... Process for preparing a substantially pure gamma phase...

C - Chemistry, Metallurgy

07

D

C07D 471/04 (2006.01) C09B 48/00 (2006.01) C09B 67/52 (2006.01)

Patent

CA 2433020

An improved process for producing a substantially pure gamma phase a quinacridone pigment or pigment derivative involving preparing an aqueous slurry of a crude quinacridone in the presence of caustic alkali and a non- polar, water immiscible solvent; and heating said slurry at a temperature above about 120 C.

L'invention concerne un procédé amélioré de production d'un pigment ou d'un dérivé de pigment quinacridone en phase gamma sensiblement pur. Ce procédé consiste à préparer une pâte aqueuse de quinacridone brute en présence d'alcali caustique et d'un solvant non polaire, non miscible dans l'eau, et à chauffer ladite pâte à une température supérieure à environ 120 DEG C.

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