Ink compositions and preparation processes thereof

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 11/02 (2006.01) B41J 27/16 (2006.01) C09D 11/00 (2006.01) C09D 11/10 (2006.01) B41J 2/01 (2006.01) B41M 5/00 (2006.01)

Patent

CA 2128976

Disclosed is a process for preparing an ink composition which comprises (a) forming a mixture by admixing water and a base; (b) adding a colorant to the mixture; and (c) adjusting the pH of the mixture by adding phosphorous acid thereto. Also disclosed is a process for preparing an ink composition which comprises (a) forming a mixture by admixing water and phosphorous acid; (b) adding a colorant to the mixture; and (c) adjusting the pH of the mixture by adding a base thereto. Further disclosed are ink compositions prepared by these processes. One embodiment is directed to an ink composition which comprises water, a colorant, and phosphorous acid. Another embodiment of the present invention is directed to an ink composition which comprises water, a colorant, and a phosphite salt. Additionally disclosed are processes which comprises incorporating these inks into an ink jet printing apparatus and causing droplets of the ink to be ejected in an imagewise pattern onto a substrate. The presence of phosphorous acid and the base create a buffer system in the ink which adjusts the ink to the desired pH, and also enables improved latency, recoverability, and waterfastness.

L'invention concerne un procédé servant à préparer une composition d'encre consistant à a) préparer un mélange en mélangeant de l'eau et une base; b) ajouter un colorant au mélange; et c) ajuster le pH du mélange en y ajoutant de l'acide phosphoreux. L'invention porte aussi sur un procédé servant à préparer une composition d'encre consistant à a) préparer un mélange en mélangeant de l'eau et de l'acide phosphoreux; b) ajouter un colorant au mélange; c) ajuster le pH du mélange en y ajoutant une base. Il est également question de compositions d'encre préparées au moyen de ces procédés. L'une des réalisations est une composition d'encre contenant de l'eau, un colorant et de l'acide phosphoreux. Une autre réalisation découlant de la présente invention est une composition d'encre contenant de l'eau, un colorant et un phosphite. La description porte en outre sur des procédés consistant à incorporer ces encres dans un appareil d'impression à jet d'encre et à faire en sorte que les gouttelettes d'encre soient éjectées sur un substrat suivant une image. L'acide phosphoreux et la base constituent dans l'encre un tampon, grâce auquel le pH de l'encre est ajusté à la valeur voulue, et en améliorent les propriétés de latence, de récupérabilité et de résistance à l'eau.

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