Pigment composition and preparation process thereof

Details Pigment composition and preparation process thereof Pigment composition and preparation process thereof

C - Chemistry, Metallurgy

09

D

400/9003, 400/90

C09D 17/00 (2006.01) C09D 7/14 (2006.01)

Patent

CA 1286825

ABSTRACT A pigment composition is composed of an intimate mixture of 75 - 95 wt.% of an organic pigment and the remainder of a polymer. Monomers which form the polymer include 0 - 40 wt.% of styrene, 20 - 70 wt.% of a methacrylic ester and 20 - 50 wt.% of methacrylic acid. The total proportion of styrene, the methacrylic ester and methacrylic acid is at least 85 wt.% of the entire monomers. The pigment composition is prepared by mixing the organic pigment with an aqueous alkaline solution, which contains the polymer and an alkali metal salt, alkali metal hydroxide, lower amine or ammonium, to form an aqueous dispersion. The organic pigment and polymer are then subjected to coprecipi- tation, preferably, by lowering the pH of the aqueous dispersion beyond 7Ø The composition can be easily dispersed as fine particles in an aqueous alkaline medium or vehicle by simply adding and mixing it with the medium or vehicle. It is therefore useful as a colorant for water-base inks and paints.

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