Loading patent…
AssigneeCanon Kabushiki Kaisha
InventorsTakashi Imai, Mikio Sanada, Yasuhiro Nito, Tetsu Iwata, Shinichi Hakamada, Sadayuki Sugama, Hideki Takayama
Estimating the term…
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.
A cyan ink, for use in an ink set having four kinds of aqueous inks consisting of the 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) a good medium or good mediums for the water-insoluble coloring material and (b) a poor medium or poor mediums for the water-insoluble coloring material, wherein:
A magenta ink, for use in an ink set having four kinds of aqueous inks consisting of a cyan ink, the 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) a good medium or good mediums for the water-insoluble coloring material and (b) a poor medium or poor mediums for the water-insoluble coloring material, wherein:
A yellow ink, for use in an ink set having four kinds of aqueous inks consisting of a cyan ink, a magenta ink, the 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) a good medium or good mediums for the water-insoluble coloring material and (b) a poor medium or poor mediums for the water-insoluble coloring material, wherein:
A black ink, for use in an ink set having four kinds of aqueous inks consisting of a cyan ink, a magenta ink, a yellow ink, and the 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) a good medium or good mediums for the water-insoluble coloring material and (b) a poor medium or poor mediums for the water-insoluble coloring material, wherein:
A yellow ink for use 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, wherein:
An ink set comprising a cyan ink, a magenta ink, a yellow ink, and a black ink,
A cyan ink, for use in a recording apparatus which forms images by the use of the cyan ink, a magenta ink, and a yellow ink, in which each ink comprises at least water, a water-insoluble coloring material, and a plurality of water-soluble organic solvents having (a) a good medium or good mediums for the water-insoluble coloring material and (b) a poor medium or poor mediums for the water-insoluble coloring material, wherein:
A magenta ink, for use in a recording apparatus which forms images by the use of a cyan ink, the magenta ink, and a yellow ink, in which each ink comprises at least water, a water-insoluble coloring material, and a plurality of water-soluble organic solvents having (a) a good medium or good mediums for the water-insoluble coloring material and (b) a poor medium or poor mediums for the water-insoluble coloring material, wherein:
A yellow ink, for use in a recording apparatus which forms images by the use of a cyan ink, a magenta ink, and the yellow ink, in which each ink comprises at least water, a water-insoluble coloring material, and a plurality of water-soluble organic solvents having (a) a good medium or good mediums for the water-insoluble coloring material and (b) a poor medium or poor mediums for the water-insoluble coloring material, wherein:
Dependencies are inferred from the claim text.