Inkjet ink and inkjet ink manufacturing method
View Patent ↗A decolorizable inkjet ink includes a first particle that contains a color-forming compound, a color-developing agent, and a polar group-containing crystalline binder; and a second particle that contains a decoloring agent and a polar group-containing crystalline binder.
1. A decolorizable inkjet ink, comprising:
an aqueous vehicle;
a first particle that disperses in the aqueous vehicle and contains a color-forming compound, a color-developing agent, and a polar group-containing crystalline binder; and
a second particle that disperses in the aqueous vehicle as a particle distinguished from the first particle and contains a decoloring agent and a polar group-containing crystalline binder.
2. The ink according to claim 1 ,
wherein the first particle and the second particle have a volumetric medium diameter (D50) of less than 1 μm as measured by a laser diffraction scattering method.
3. The ink according to claim 1 ,
wherein the decoloring agent is a hindered amine derivative.
4. The ink according to claim 1 ,
wherein the color-developing agent has a molecular chain with a phenolic hydroxyl group, and a molecular weight of at least 1,000.
5. A method for manufacturing a decolorizable inkjet ink, the method comprising:
preparing an aqueous dispersion of a first particle that contains a color-forming compound, a color-developing agent, and a polar group-containing crystalline binder, and an aqueous dispersion of a second particle that contains a decoloring agent and a polar group-containing crystalline binder; and
mixing the aqueous dispersion of the first particle and the dispersion of the second particle to each other for obtaining a mixture which has the first particle and the second particle which is distinguished from the first particle.
6. The method according to claim 5 ,
wherein the first particle and the second particle are produced with a high-pressure atomizer to have a volumetric medium diameter (D50) of less than 1 μm as measured by a laser diffraction scattering method.
7. The method according to claim 5 ,
wherein the decoloring agent is a hindered amine derivative.
8. The method according to claim 5 ,
wherein the color-developing agent has a molecular chain with a phenolic hydroxyl group, and a molecular weight of at least 1,000.