Aqueous ink, ink-jet recording method, ink cartridge, recording unit and ink jet recording apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKouhei Nakagawa, Shinichi Hakamada, Tetsu Iwata, Masashi Ogasawara, Masashi Tsujimura, Shuichi Okazaki
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Abstract
An aqueous ink to be used in an ink jet recording method that an ink is ejected from a recording head by the action of thermal energy, wherein the ink contains a pigment, a polymer and a water-soluble organic solvent, the hydrophilicity δm of the pigment falls within a range of from 21.5 or more to 23.5 or less, and the content (mass %) of the water-soluble organic solvent is from 5.0 mass % or more to 17.5 mass % or less with respect to the whole mass of the aqueous ink.
Claims19
An aqueous ink to be used in an ink jet recording method that an ink is ejected from a recording head by action of thermal energy, wherein
- the ink comprises a pigment, a polymer and a water-soluble organic solvent,
- a hydrophilicity δm of the pigment falls within a range of from 21.5 or more to 23.5 or less, and
- a content (mass %) of the water-soluble organic solvent is from 5.0 mass % or more to 17.5 mass % or less with respect to the whole mass of the aqueous ink.
An aqueous ink to be used in an ink jet recording method that an ink is ejected from a recording head by the action of thermal energy, wherein
- the ink comprises a pigment, a polymer and a water-soluble organic solvent,
- the pigment is C.I. Pigment Violet 23, and
- a content (mass %) of the water-soluble organic solvent is from 5.0 mass % or more to 17.5 mass % or less with respect to the whole mass of the aqueous ink.
An aqueous ink to be used in an ink jet recording method that an ink is ejected from a recording head by the action of thermal energy, wherein
- the ink comprises C.I. Pigment Violet 23 and has a maximum absorption wavelength each in a wavelength range of from 530 nm or more to 540 nm or less and in a wavelength range of from 550 nm or more to 570 nm or less, and
- a relationship between an absorbance (A) at the maximum absorption wavelength located in the wavelength range of from 530 nm or more to 540 nm or less and an absorbance (B) at the maximum absorption wavelength located in the wavelength range of from 550 nm or more to 570 nm or less satisfies conditions of the following expression (1):
- 0.93≦(B)/(A)≦0.97 (1).
Dependencies are inferred from the claim text.