Preparation of pigmentary grade pigment from crude pigment

Details Preparation of pigmentary grade pigment from crude pigment Preparation of pigmentary grade pigment from crude pigment

C - Chemistry, Metallurgy

09

B

241/136, 260/275

C09B 47/04 (2006.01) C09B 48/00 (2006.01) C09B 67/00 (2006.01) C09B 67/10 (2006.01)

Patent

CA 1199026

TITLE Preparation of Pigmentary Grade Pigment From Crude Pigment ABSTRACT Finished grade pigments are prepared from crude pigment precursors by conversion to aggregated low crystallinity pigment followed by milling the aggregated low crystallinity pigment in water having a pH of from 7 to 14 and from 5 to 25% based on pig- ment of a separate phase comprising an organic liquid which is effective in growing and improving the crystallinity of the pigment particles. The resulting material is extracted in dilute acid, washed free of acid and dried to produce the final finished grade pigment.

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