Inkjet ink and inkjet recording apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorNORIAKI OZAWA
Life of this patent
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Abstract
An inkjet ink includes: a quinacridone pigment, a pigment dispersion resin, and an aqueous medium. The pigment dispersion resin includes an adsorbed resin adsorbed on the quinacridone pigment and an unadsorbed resin that is not adsorbed on the quinacridone pigment. The unadsorbed resin has a weight average molecular weight of 5,000 or less. A ratio of the unadsorbed resin in the pigment dispersion resin is 10 mass % or less. A phosphorus concentration in a 50-fold diluted solution of a supernatant liquid obtained by centrifuging the ink at 23° C. and 140,000 rpm for 3 hours is 0.5 ppm or less.
Claims2
An inkjet ink, comprising:
- a quinacridone pigment;
- a pigment dispersion resin;
- and
- an aqueous medium,
- the pigment dispersion resin including an adsorbed resin adsorbed on the quinacridone pigment and an unadsorbed resin that is not adsorbed on the quinacridone pigment,
- the unadsorbed resin having a weight average molecular weight of 5,000 or less,
- a ratio of the unadsorbed resin in the pigment dispersion resin being 10 mass % or less,
- a phosphorus concentration in a 50-fold diluted solution of a supernatant liquid obtained by centrifuging the ink at 23° C. and 140,000 rpm for 3 hours being 0.5 ppm or less.
Dependencies are inferred from the claim text.