C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 11/00 (2006.01) B01F 3/12 (2006.01) B01F 7/08 (2006.01) C09D 11/02 (2006.01) C09D 17/00 (2006.01)
Patent
CA 2193105
A method of making an improved dispersion of magnetic particles, inorganic pigments, organic pigments, or carbon black, in a liquid carrier by continuously subjecting said dispersion to high sheer forces to deagglomerate the particles, while concurrently extruding the dispersion from regions of high pressure to regions of lower pressure, until a dispersion is obtained that has a narrow distribution of particle sizes, with the particles being uniformly distributed throughout the carrier. Also disclosed is a method for making an ink by dispersing particles in a heated medium that comprises an oil, without the presence of any volatile organic solvent, and after forming such a dispersion, continuously adding a suitable ink vehicle to said dispersion to form the desired ink without allowing the dispersion to solidify.
Procédé de préparation d'une dispersion améliorée de particules magnétiques, de pigments inorganiques, de pigments organiques ou de noir de carbone dans un véhicule liquide, consistant à soumettre en continu ladite dispersion à des forces de cisaillement élevées, de manière à désagglomérer les particules, tout en extrudant simultanément la dispersion depuis des zones de pression élevée vers des zones de pression plus basse, jusqu'à l'obtention d'une dispersion possédant une répartition étroite de la granulométrie des particules, ces dernières étant uniformément réparties dans le véhicule. L'invention concerne également un procédé de préparation d'une encre par dispersion des particules dans un milieu réchauffé comprenant une huile, sans la présence d'un solvant organique volatil et, après la formation de la dispersion, par apport continu d'un véhicule approprié à ladite dispersion, de manière à obtenir l'encre souhaitée tout en permettant à la dispersion de se solidifier.
Dritlein Donald Kenneth
Lustenader Robert Alan
Marconi Data Systems Inc.
Smart & Biggar
The General Electric Company Plc
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