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US 8,523,992 B2Granted
Magenta recording ink composition, inkjet recording method, and ink recorded matter
AssigneeRicoh Company, Ltd.
InventorsAkihiko Matsuyama, Yuji Natori
Life of this patent
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Abstract
The present invention provides a magenta recording ink composition including at least a solid solution pigment (A) containing quinacridone, a lake pigment (B) having a xanthene structure, an aqueous solvent, and water, wherein the solid solution pigment (A) has visible light absorption peaks at wavelength ranges of from 510 nm to 530 nm and from 540 nm to 560 nm, and a mass ratio (B/A) of the lake pigment (B) to the solid solution pigment (A) falls within the range of 0.1 to 5.
Claims15
A magenta recording ink composition, comprising:
- a solid solution pigment (A) comprising quinacridone;
- a lake pigment (B) having a xanthene structure;
- an aqueous solvent;
- and
- water,
- wherein the solid solution pigment (A) has visible light absorption peaks at wavelength ranges of from 510 nm to 530 nm and from 540 nm to 560 nm,
- wherein a mass ratio (B/A) of the lake pigment (B) to the solid solution pigment (A) falls within the range of 0.1 to 5, and
- wherein each of the solid solution pigment (A) and the lake pigment (B) is dispersed with a dispersant of formula (1A)
5 more elements
Dependencies are inferred from the claim text.