Inkjet ink and inkjet recording apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorSatoshi Sato
Life of this patent
Estimating the term…
Abstract
An inkjet ink includes: a quinacridone pigment; a pigment coating resin; and an aqueous medium. The pigment coating resin includes an adsorbed resin that is adsorbed on the quinacridone pigment and an unadsorbed resin that is not adsorbed on the quinacridone pigment. A ratio of the unadsorbed resin to the pigment coating resin is 18 mass % or more and 52 mass % or less. A phosphorus concentration in a supernatant liquid is 1.0 ppm or more and 12.5 ppm or less, the supernatant liquid being obtained by centrifuging the inkjet ink at 1,050,000 G for 3 hours. A sulfur concentration in the supernatant liquid is 1.0 ppm or more and 12.5 ppm or less. Absorbance of a first peak in an ultraviolet-visible light absorption spectrum of a 25-fold diluted solution of the supernatant liquid is 0.010 or less.
Claims10
An inkjet ink, comprising:
- a quinacridone pigment;
- a pigment coating resin;
- and
- an aqueous medium,
- the pigment coating resin including an adsorbed resin that is adsorbed on the quinacridone pigment and an unadsorbed resin that is not adsorbed on the quinacridone pigment,
- a ratio of the unadsorbed resin to the pigment coating resin being 18 mass % or more and 52 mass % or less,
- a phosphorus concentration in a supernatant liquid being 1.0 ppm or more and 12.5 ppm or less, the supernatant liquid being obtained by centrifuging the inkjet ink at 1,050,000 G for 3 hours,
- a sulfur concentration in the supernatant liquid being 1.0 ppm or more and 12.5 ppm or less,
- absorbance of a first peak in an ultraviolet-visible light absorption spectrum of a 25-fold diluted solution of the supernatant liquid being 0.010 or less,
- the first peak being a maximum peak in a wavelength range of 400 nm or more and 450 nm or less.
Dependencies are inferred from the claim text.