Process for producing transparent pigmentary quinacridones...

Details Process for producing transparent pigmentary quinacridones... Process for producing transparent pigmentary quinacridones...

C - Chemistry, Metallurgy

09

B

C09B 48/00 (2006.01) C09B 67/14 (2006.01) C09B 67/22 (2006.01) C09D 5/36 (2006.01)

Patent

CA 2190719

A process for preparing transparent, pigmentary quinacridone compounds and solid solutions thereof comprises combining a premilled sub-pigmentary powder containing at least one unsubstituted or substituted quinacridone or a derivative thereof with a sufficient amount of moderately concentrated sulfuric acid to form a slurry, then agitating this slurry in the presence of an organic liquid which is immiscible or only partially miscible with the slurry and which is effective in deagreggating and improving the crystallinity of the pigment for an effective length of time to convert the sub-pigmentary unsubstituted or substituted quinacridone or solid solution thereof to a transparent, pigmentary form.

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