Aqueous ink, ink set, and image-forming method
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United States of America Patent
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Jul 22, 2008
Grant Date -
May 11, 2006
app pub date -
Dec 22, 2005
filing date -
Jun 28, 2004
priority date (Note) -
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Abstract
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 B.sub.1/A.sub.1 is from 0.5 or more to 3.0 or less, where A.sub.1 denotes the total content (mass %) of the good medium based on the total mass of the cyan ink and B.sub.1 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.
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