Aqueous ink, ink set, and image-forming method

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 11/00 (2006.01) B41J 2/01 (2006.01) B41M 5/00 (2006.01)

Patent

CA 2565704

The present invention aims to provide an ink which has a sufficiently large area factor even in a small ink droplet quantity and can obtain images having a high image density, and further has a superior storage stability. According to the present invention, a cyan ink is provided which is used in an ink set having four kinds of aqueous inks consisting of a cyan ink, a magenta ink, a yellow ink and a black ink in which each ink comprises at least water, a water-insoluble coloring material, and a plurality of water-soluble organic solvents having a good medium or good mediums for the water-insoluble coloring material and a poor medium or poor mediums for the water-insoluble coloring material, wherein, the ratio B1/A1 is from 0.5 or more to 3.0 or less, where A1 denotes the total content (mass%) of the good medium based on the total mass of the cyan ink and B1 denotes the total content (mass%) of the poor medium based on the total mass of the cyan ink, and a water-soluble organic solvent which shows the maximum Ka value among the respective Ka values of the plurality of water-soluble organic solvents as determined by the Bristow method is the poor medium.

Il est prévu une encre d'un facteur superficiel suffisamment grand même avec une petite quantité de gouttelette d'encre et d'excellente stabilité tout au long de sa durée de conservation, permettant d'obtenir une image d'une excellente densité d'image. Il est prévu spécifiquement une encre cyan utilisée pour un système d'encre comprenant quatre types d'encres aqueuses, à savoir une encre cyan, une encre magenta, une encre jaune et une encre noire, contenant respectivement au moins de l'eau, un colorant insoluble dans l'eau et une pluralité de solvants organiques solubles dans l'eau englobant un bon solvant pour le colorant insoluble dans l'eau et un solvant médiocre pour le colorant insoluble dans l'eau. L'encre cyan est caractérisée en ce que la quantité totale A<SUB>1</SUB> (% en masse) du bon solvant contenu dans l'encre cyan et la quantité totale B<SUB>1</SUB> (% en masse) du solvant médiocre contenu dans l'encre cyan ont un rapport B<SUB>1</SUB>/A<SUB>1</SUB> supérieur ou égal à 0,5 et ne dépassant pas 3,0; et le solvant soluble dans l'eau ayant la valeur Ka la plus élevée déterminée par le procédé Bristow parmi les solvants organiques solubles dans l'eau est un solvant médiocre.

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