Process for the preparation of an organic pigment dispersion

Details Process for the preparation of an organic pigment dispersion Process for the preparation of an organic pigment dispersion

C - Chemistry, Metallurgy

09

D

134/52

C09D 17/00 (2006.01) C09B 67/00 (2006.01) C09D 5/02 (2006.01)

Patent

CA 1269016

ABSTRACT An organic pigment dispersion in a non-aqueous medium is prepared directly from an aqueous slurry containing 0.1-20% by weight of the pigment by mixing the aqueous slurry with the non-aqueous medium under vigorous agitation and subsequently isolating the organic pigment dispersion from the residual aqueous phase. A substantial part of water in the resulting pigment disperion can be removed by passing the organic pigment dispersion in the non-aqueous medium over a series of surfaces, the surface material thereof having different affinity for water than the non-aqueous medium, respectively, and then removing water and pigment dispersion in the non-aqueous medium, respectively, from respective surfaces.

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