Jet ink composition

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 11/00 (2006.01)

Patent

CA 2349591

The present invention provides a jet ink composition comprising a volatile organic solvent, an oil, one or more binder resins which are soluble in the volatile organic solvent, and a colorant. The ink composition is fast drying and provides excellent adhesion to non-porous substrates. Printers, such as drop-on-demand ink jet printers, employing the ink composition can operate without nozzle clogging even after long non-printing intervals. The present invention further provides a method for reducing clogging of a nozzle orifice in an ink jet printer comprising printing with an ink composition that includes an oil that forms a continuous oil phase which acts as the boundary layer between the air outside the nozzle orifice and the ink inside the nozzle during non-printing intervals. The present invention further provides a process for jet ink printing onto a substrate comprising projecting a stream of ink droplets of the ink composition of the present invention to the substrate and controlling the direction of the droplets so that the droplets form the desired printed image on the substrate.

La présente invention concerne une composition d'encre pour imprimante à jet d'encre, qui comprend un solvant organique volatile, une huile, une ou plusieurs résines liantes solubles dans le solvant organique volatile, et un colorant. D'un séchage rapide, cette composition d'encre adhère remarquablement bien sur les substrats non poreux. Utilisée avec des imprimantes à jet d'encre du type goutte à la demande, cette composition d'encre empêche le colmatage des buses, même après des périodes de non-utilisation prolongées. Cette invention concerne également un procédé permettant de réduire le colmatage des orifices de buse sur une imprimante à jet d'encre. Ce procédé consiste à utiliser une composition d'encre d'impression dont la composante huile forme une phase huileuse continue qui fait office de couche d'arrêt entre l'air à l'extérieur de la buse et l'encre à l'intérieur de la buse pendant les périodes de repos de l'imprimante. L'invention englobe également un procédé d'impression par jet d'encre sur un substrat qui consiste à projeter un flux de gouttelettes de l'encre selon l'invention sur un substrat et à contrôler la direction des gouttelettes pour qu'elles forment l'image recherchée sur le substrat.

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