Aqueous magnetic ink character recognition ink-jet ink...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 11/00 (2006.01)

Patent

CA 2491360

An aqueous ink-jet ink composition for MICR applications is provided comprising a metal oxide pre-dispersion combined with an aqueous ink-jet ink composition, wherein the metal oxide pre-dispersion contains metal oxide pigment or particles of a very small particle size, about 0.5~ or less, and exhibiting high remanence of at least 20 emu/g. The metal oxide particles may be coated with a hydrophilic coating, and the pre-dispersion may contain at least one surfactant to aid in the dispersion of the metal oxide particles. Also provided are various processing techniques to enhance the MICR ink performance, including conventional and non-conventional grinding techniques and various filtration techniques.

L'invention concerne une composition aqueuse d'encre pour impression par jet d'encre, destinée à des applications MICR. Cette composition comprend une prédispersion d'oxyde métallique combinée à une composition d'encre aqueuse pour impression par jet d'encre, laquelle prédispersion d'oxyde métallique contenant un pigment ou des particules d'oxyde métallique présentant une taille particulaire très faible, inférieure à 0,5µm environ, et présentant une forte rémanence d'au moins 20 emu/g. Les particules d'oxyde métallique peuvent être enrobées d'un enrobage hydrophile, et la prédispersion peut contenir au moins un agent de surface pour faciliter la dispersion des particules d'oxyde métallique. L'invention concerne également des procédés de traitement variés permettant d'accroître la performance de l'encre MICR, y compris des techniques de broyage de pigment classiques et non classiques, ainsi que des techniques de filtration variées.

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