Treatment of transition metal containing pigments with...

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 3/08 (2006.01) C09C 1/24 (2006.01) C09C 1/62 (2006.01) C09C 3/12 (2006.01) C09D 17/00 (2006.01) G11B 5/706 (2006.01) G11B 5/712 (2006.01) H01F 41/16 (2006.01) G01J 3/28 (2006.01)

Patent

CA 2233947

A surface derivatizing agent having an .alpha., .gamma.-diketo moiety, a beta- hydroxy acid moiety, a hydroxamic acid moiety, a phosphonic acid moiety, or a phenolic moiety, or that is a trimethylsilyl donor, is allowed to contact an aqueous slurry of pigment particles selected from the group consisting of transition metal containing pigment particles, transition metal oxide containing pigment particles, and complexes of transition metals or transition metal oxides, to increase the hydrophobicity of the surface of such particles. The modified pigment particles disperse easily in a wide variety of organic solvents, and provide stable dispersions having a small mean pigment particle size and narrow particle size distribution.

Un agent de dérivation de surface comportant une fraction .alpha.,.gamma.-dicéto, une fraction acide béta-hydroxy, une fraction acide hydroxamique, une fraction acide phosphonique ou une fraction phénolique, ou qui est donneur de triméthylsilyle, est mis en contact avec une boue aqueuse de particules de pigments sélectionnés dans le groupe constitué de particules de pigments constituées d'un métal de transition, de particules de pigments constituées d'un oxyde de métal de transition, et de complexes de métaux de transition ou d'oxydes de métaux de transition, dans le but d'accroître l'hydrophobie de la surface de ces particules. Les particules de pigments modifiées se dispersent facilement dans une large gamme de solvants organiques, et permettent d'obtenir des dispersions stables ayant une faible taille moyenne des particules de pigments et une répartition étroite des tailles de particules.

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