Canon Kabushiki Kaisha

Yui Kitamura

Masashi Ogasawara

Tomonari Watanabe

Katsuhiko Takahashi

Mikio Sanada

Yasushi Nakano

Noriyasu Asaki

A water-based ink of the present invention includes water, a plurality of different water-soluble organic solvents, and a water-insoluble coloring material, wherein the above water-soluble organic solvents consist of a good solvent to the above water-insoluble coloring material and a poor solvent to the above water-insoluble coloring material, and the total amount (% by mass) of the good solvents in the ink is represented by A and the total amount (% by mass) of the poor solvent in the ink is represented by B, the ratio of A to B ranges from 10:5 to 10:30 both inclusive, and when the respective Ka values of the above water-soluble organic solvents are determined by the Bristow method and compared with each other, a water-soluble organic solvent having the largest Ka value is the poor solvent. The pigment ink has a sufficiently large area factor even with a small amount of ink and provides an image of high OD.

Water-based ink, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image forming method

A water-based ink of the present invention includes water, a plurality of different water-soluble organic solvents, and a water-insoluble coloring material, wherein the water-soluble organic solvents consist of a good solvent to the water-insoluble coloring material and a poor solvent to the water-insoluble coloring material, and the total amount (% by mass) of the good solvents in the ink is represented by A and the total amount (% by mass) of the poor solvent in the ink is represented by B, the ratio of A to B ranges from 10:5 to 10:30 both inclusive, and when the respective Ka values of the above water-soluble organic solvents are determined by the Bristow method and compared with each other, a water-soluble organic solvent having the largest Ka value is the poor solvent. The pigment ink has a sufficiently large area factor even with a small amount of ink.

A residual ink container comprising laminated members for absorbing residual ink not used for recording, wherein the laminated members are laminated with a gap between adjacent ones of the members; and a covering member covering such that non-contact portion is provided between the covering member and a topmost one of the laminated member so as not to press against the topmost one.

Ink jet recording apparatus

An object of the present invention is to provide an aqueous ink which can form a more excellent image in bleeding resistance, character quality and print density than the image formed by using an aqueous ink containing a conventional self-dispersion pigment and a salt. The aqueous ink includes a self-dispersion pigment and a salt, in which the self-dispersion pigment is a pigment containing a pigment particle having a &#x2014;R&#x2014;(COOM)group bonded to a surface of the pigment particle, wherein R represents an alkylene group or an aromatic ring; Mrepresents a hydrogen atom, an alkali metal, an ammonium or an organic ammonium; and n is an integer of 2 or more.

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Kanagawa, Japan

Yui Kitamura