Inkjet ink and inkjet recording apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorSatoshi SATO
Life of this patent
Estimating the term…
Abstract
An inkjet ink contains quinacridone pigment, pigment dispersion resin, and aqueous medium. The pigment dispersion resin contains absorbed resin that is absorbed by the quinacridone pigment and unabsorbed resin that is not absorbed by the quinacridone pigment. A ratio of the unabsorbed resin to the pigment dispersion resin is 50 weight percent or less. A sulfur concentration in the 10-fold diluent of supernatant liquid obtained by centrifuging the inkjet ink at 1,050,000 G for three hours is 0.4 ppm or more and 7.0 ppm or less. In an ultraviolet and visible ray absorption spectrum of the 25-fold diluent of the supernatant liquid, light absorbance at a predetermined peak is 0.7 or less. The predetermined peak is a maximum peak in a wavelength range of 400 nm or more and 490 nm or less.
Claims12
An inkjet ink containing quinacridone pigment, pigment dispersion resin, and aqueous medium, wherein
- the pigment dispersion resin contains absorbed resin that is absorbed by the quinacridone pigment, and unabsorbed resin that is not absorbed by the quinacridone pigment,
- a ratio of the unabsorbed resin to the pigment dispersion resin is 50 weight percent or less,
- a sulfur concentration in 10-fold diluent of supernatant liquid obtained by centrifuging the inkjet ink at 1,050,000 G for three hours is 0.4 ppm or more and 7.0 ppm or less, and
- in an ultraviolet and visible ray absorption spectrum of 25-fold diluent of the supernatant liquid, light absorbance at a predetermined peak is 0.7 or less, and the predetermined peak is a maximum peak in a wavelength range of 400 nm or more and 490 nm or less.
Dependencies are inferred from the claim text.