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AssigneeCanon Kabushiki Kaisha
InventorsMakoto Aoki, Yoshifumi Hattori, Mayumi Yamamoto, Shinichi Tochihara, Yoshihisa Takizawa, Akira Nagashima, Shinichi Sato
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Disclosed herein is an ink comprising a dye having at least one anionic group, an amino acid type polyamine or a polyethyleneimine containing at least 7 nitrogen atoms in its molecule, and water, wherein the dye is either a metallized azo dye or a nonmetallized azo dye satisfying the following conditions (x) and (y) at the same time: (x) no anionic group is situated at an ortho position to the azo bond, and at least one anionic group exists at another position than the ortho position to the azo bond; and (y) at least one aromatic residue is bonded to the azo bond, and the aromatic ring of the aromatic residue is a benzene or naphthalene ring, with the proviso that the aromatic rings situated on both sides of the azo bond are not naphthalene rings at the same time if present.
An ink comprising a dye having at least one anionic group, a polyamine selected from the group consisting of a polyamine containing an amino acid group and a polyethyleneimine containing at least 7 nitrogen atoms in its molecule, and water, wherein the dye is either a metallized azo dye or a nonmetallized azo dye satisfying the following conditions (x) and (y) at the same time:
Dependencies are inferred from the claim text.