Method for preparing modified magnetic pigment particles

Details Method for preparing modified magnetic pigment particles Method for preparing modified magnetic pigment particles

C - Chemistry, Metallurgy

09

C

C09C 1/24 (2006.01) C09C 3/08 (2006.01) C09D 11/00 (2006.01) G11B 5/706 (2006.01) G11B 5/712 (2006.01) H01F 41/16 (2006.01) G01J 3/28 (2006.01)

Patent

CA 2233946

A method for preparing modified magnetic pigment particles which are used in magnetic ink compositions and magnetic recording media. The magnetic pigment particles are prepared from an aqueous slurry. A surface derivatizing agent is added to the slurry to render the magnetic pigment particles hydrophobic. The particles then sink to the bottom of the slurry, and the bulk water is then removed. After air drying, dry magnetic pigment particles are provided. The particles will be hydrophobic, and thus will have superior resistance to water as compared to previously known magnetic pigment particles.

L'invention se rapporte à un procédé de préparation de particules pigmentaires magnétiques modifiées qui sont utilisées dans des compositions d'encre magnétique et des supports d'enregistrement magnétiques. Les particules pigmentaires magnétiques sont préparées à partir d'une pâte fluide aqueuse. Un agent de dérivatisation de surface est ajouté à la pâte fluide pour rendre les particules pigmentaires magnétiques hydrophobes. Les particules tombent alors au fond de la pâte fluide et l'eau libre est ensuite retirée. Après séchage à l'air, on obtient des particules pigmentaires magnétiques sèches. Les particules deviennent hydrophobes et ont, par conséquent, une meilleure résistance à l'eau comparé aux particules pigmentaires magnétiques connues.

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