Coloring composition for image formation and method for...

C - Chemistry – Metallurgy – 09 – B

Patent

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C09B 29/42 (2006.01) B41M 5/00 (2006.01) C09B 29/033 (2006.01) C09B 29/36 (2006.01) C09B 29/52 (2006.01) C09D 11/00 (2006.01) C09D 11/02 (2006.01)

Patent

CA 2439113

A coloring composition for image formation comprising an azodye having an aromatic nitrogen-containing 6-membered heterocyclicring as a coupling component, a coloring composition which comprises an azo compound having an oxidation potential noblen than 1.0 Vvs.SCE and comprising at least two substituents having a pKa value of-10 to 5 in water, and a method for improving ozone resistance of a color image, the method comprising using a compound having an oxidation potential nobler than 1.0 V vs.SCE and showing a maximum absorption at a wavelength between 500 nm and 580 nm with a half-value width of 150 nm or narrower.

L'invention concerne une composition colorante conçue pour la formation d'images, qui renferme un colorant azoïque ayant un noyau hétérocyclique à 6 chaînons contenant de l'azote aromatique, une composition colorante renfermant un composé azoïque ayant un potentiel d'oxydation supérieur à 1,0 V par rapport à SCE et au moins deux substituants d'une valeur pKa comprise entre 10 et 5 dans l'eau. L'invention concerne en outre un procédé destiné à améliorer la résistance de l'image couleur à l'ozone, ledit procédé consistant à utiliser un composé présentant un potentiel d'oxydation supérieur à 1,0 V par rapport à SCE, ainsi qu'une absorption maximale à une longueur d'onde comprise entre 500 nm et 580 nm avec une demi-largeur de 150 nm ou plus étroite encore.

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