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US 8,834,621 B2Granted
Pigment particle, ink, ink cartridge, and ink jet recording method
AssigneeCanon Kabushiki Kaisha
InventorsSatoshi Takebayashi, Yoshio Nakajima, Shuichi Okazaki, Eiichi Nakata
Life of this patent
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Abstract
Provided is a pigment particle suitable for an ink capable of recording an image that is excellent in color developability and lightfastness, and has a yellow hue. The pigment particle is a pigment particle having a structure represented by the following formula (1), in which a maximum absorption wavelength of an absorption spectrum in a wavelength region of 200 nm or more and 800 nm or less is present in a range of 340 nm or more and 360 nm or less.
Claims11
An ink comprising a pigment with pigment particles having a structure represented by the following formula (1):
- wherein a maximum absorption wavelength of the pigment particles of an absorption spectrum in a wavelength region of 200 nm or more and 800 nm or less is present in a range of 340 nm or more and 360 nm or less;
- and
- wherein the pigment particles have an average diameter on a volume basis of 50 nm or less.
Dependencies are inferred from the claim text.