Color changing compositions

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 11/16 (2006.01) B05D 1/36 (2006.01) B05D 7/00 (2006.01) B44D 2/00 (2006.01) C09D 5/29 (2006.01) C09D 7/00 (2006.01) C09D 11/00 (2006.01) C09D 13/00 (2006.01)

Patent

CA 2101365

A multiple coloring composition system is disclosed whose coloring effect is changed upon treatment with a second coloring composition, once the second coloring composition has been deposited over the undercolor coloring composition. The multiple ink system comprises: (a) an undercolor aqueous coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater and/or by a reducing agent; and (b) an overcolor aqueous coloring composition comprising a colorant capable of maintaining its characteristic color in the presence of a pH of about 10 or greater and/or a reducing agent, a base in an amount sufficient to yield a pH of the overcolor composition of about 10 or greater, and/or a reducing agent.

Multisystème de composition de couleur, selon lequel l'effet de coloration est modifié grâce à un traitement au moyen d'une seconde composition de couleur lorsque cette dernière est déposée sur la composition de sous-couleur. Le multisystème d'encre comprend : a) une composition aqueuse de sous-couleur constituée d'un colorant de sous-couleur dont la capacité de coloration est éliminée en présence d'un pH d'environ 10 ou plus et/ou d'un réducteur; b) une composition aqueuse de sur-couleur constituée d'un colorant capable de conserver sa couleur caractéristique en présence d'un pH d'environ 10 ou plus et/ou d'un réducteur, d'une base en quantité suffisante pour avoir un pH de la composition de sur-couleur d'environ 10 ou plus et/ou un réducteur.

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