US 7,682,433 B2Granted

Ink set, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus

AssigneeCanon Kabushiki Kaisha

InventorsSatomi Yanagimachi, Kumiko Mafune, Mikio Sanada, Kenji Moribe, Tomonari Watanabe, Daiji Okamura, Hideki Yamakami, Satoshi Kudo, Fumiharu Nakamura

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Abstract

In an ink set having a plurality of inks, the ink set has at least a pigment ink and a dye ink. The pigment ink contains at least water, a surfactant, a self-dispersion pigment, and a poor medium for self-dispersion pigment and/or a salt; a dynamic surface tension of the pigment ink at a lifetime of 50 milliseconds is higher than 47 mN/m. The dye ink contains at least water, a surfactant and a dye. An ink set is provided which can obtain images having a high image density and a superior bleeding resistance without regard to the types of recording mediums.

Claims14

Dependent claims

An ink set comprising:

a plurality of inks including a pigment ink and a dye ink,
wherein the pigment ink comprises at least water, a surfactant, a self dispersion pigment, and at least one of a poor medium for self-dispersion pigment and a salt,
wherein the surfactant of the pigment ink is polyoxyethylene alkyl ether,
wherein a dynamic surface tension, at 25° C., of the pigment ink at a lifetime of 50 milliseconds is higher than 47 mN/m,
wherein the dye ink comprises at least water, a surfactant, and a dye, and
wherein a content (% by mass) of the surfactant in the pigment ink is from 0.10% by mass or more to 0.75% by mass or less based on the total mass of the pigment ink.

3 more elements

Dependencies are inferred from the claim text.