Process for preparation of quinacridone solid solutions
AssigneeCiba-Geigy Corporation
InventorsEdward E. Jaffe, Johannes Pfenninger
Life of this patent
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Abstract
A process for preparing pigmentary solid solutions of at least one quinacridone derivative and the parent quinacridone compound which comprises milling the starting quinacridone materials at ambient or near ambient temperatures in the presence of an alcohol and a base.
Claims17
A process for making a solid solution of at least two quinacridone compounds which consists essentially of milling the crude or subpigmentary quinacridone compounds at a temperature of 20.degree.-40.degree. C. in the presence of an amount 5-25 times the weight of the quinacridone compounds of a low boiling alkanol or glycol and 0.5-10.0%, by weight of said alkanol or glycol, of an alkali metal hydroxide or quaternary ammonium hydroxide, and isolating the resulting solid solution.
Dependencies are inferred from the claim text.