Pigment-based non-aqueous ink-jet inks

Details Pigment-based non-aqueous ink-jet inks Pigment-based non-aqueous ink-jet inks

C - Chemistry, Metallurgy

09

D

C09D 11/02 (2006.01)

Patent

CA 2670326

The present invention is drawn to ink commpositions and methods for ink-jet recording. The ink compositions can include a milled pigment, a surfactant, a non-aqueous co-solvent system, and at least 2 wt% resin solublized in the ink composition. The non-aqueous solvent system comprises a main co-solvent system, where each co-solvent of this system has a surface tension less than 32 dynes/cm at 25 oC. the co-solvent system also includes gamma butyrolactone and a second co-solvent system. The second co-solvent system includes one or more co-solvent(s), each having a surface tension of greater than 32 dynes/cm at 25 oC. The second co-solvent system or other components can optionally act to increase the overall surface tension of the ink composition as a whole.

La présente invention concerne des compositions d'encre et des procédés pour enregistrement à jet d'encre. Les compositions d'encre peuvent comprendre un pigment broyé, un agent tensioactif, un système de cosolvant non aqueux, et au moins 2 % en poids de résine solubilisée dans la composition d'encre. Le système de solvant non aqueux comporte un système de cosolvant principal, où chaque cosolvant de ce système a une tension superficielle inférieure à 32 dynes/cm à 25 °C. Le système de cosolvant comprend également de la gamma butyrolactone et un second système de cosolvant. Le second système de cosolvant comprend un ou plusieurs cosolvants, chacun ayant une tension superficielle supérieure à 32 dynes/cm à 25 °C. Le second système de cosolvant ou d'autres composants peuvent facultativement agir pour augmenter la tension superficielle globale de la composition d'encre dans son ensemble.

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