Production of pigment compositions

Details Production of pigment compositions Production of pigment compositions

C - Chemistry, Metallurgy

09

D

6/217, 6/26

C09D 11/02 (2006.01) C09B 41/00 (2006.01) C09B 67/10 (2006.01) C09B 67/14 (2006.01) C09B 67/20 (2006.01)

Patent

CA 2000155

The present invention provides processes for the production of a pigment composition comprising: Ia) contacting a pigment, before or during its synthesis, with a water-immiscible carrier medium, arid then completing the pigment synthesis to produce a pigment composition comprising the pigment and the water-immiscible carrier medium, and isolating the product or, optionally Ib) contacting the resulting aqueous fully-synthesized pigment composition with an aliphatic organic acid and optionally a water-immiscible carrier medium; adjusting the pH value of the mixture so obtained to below 7.0; and then adjusting to the pH value of the mixture to a value above 7.0 thereby transferring the organic acid into the aqueous phase; and isolating a pigment composition comprising the pigment and the water-immiscible carrier medium, or II) contacting an aqueous conventionally fully-synthesized pigment slurry with an aliphatic organic acid and a water-immiscible carrier medium according to above step Ib).

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