Process for preparing modified beta-quinacridone pigment

C - Chemistry – Metallurgy – 09 – B

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C09B 48/00 (2006.01) C09B 67/04 (2006.01) C09B 67/10 (2006.01) C09B 67/52 (2006.01)

Patent

CA 2070576

P-18676/A/CGC 1558 PROCESS FOR PREPARING MODIFIED BETA-QUINACRIDONE PIGMENT Abstract of the Disclosure A process for preparing a modified beta quinacridone polytype having identified color space values which comprises the steps of dry pre-milling beta phase quinacridone, deaggregating the pre-milled product in an alcohol-base medium and ripening the deaggregated product in the presence of an oxidizing agent.

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