Aqueous base metal pigment dispersion liquid and aqueous ink composition
Disclosed herein is an aqueous base metal pigment dispersion liquid, including: a base metal pigment surface-treated with a fluorine-based compound; and water as a part of a solvent, in which the aqueous base metal pigment dispersion liquid further includes one or more solvents having a specific dielectric constant of greater than or equal to 30 and less than or equal to 50 and one or more solvents having a specific dielectric constant of less than 30, as measured by an alternate current-type dielectric constant measurement device at a temperature of 23° C. and a frequency of 10 kHz, as the solvent, as the solvent, and in which the sum of the solvents having a specific dielectric constant of greater than or equal to 30 and less than or equal to 50 is more than or equal to 5 mass % and less than or equal to 50 mass % and the sum of the solvents having a specific dielectric constant of less than 30 is more than or equal to 5 mass % and less than or equal to 20 mass %, when the total amount of the solvents is 100 mass %.
1. An aqueous base metal pigment dispersion liquid, comprising:
a base metal pigment surface-treated with a fluorine-based compound; and
water as a part of a solvent,
wherein the aqueous base metal pigment dispersion liquid further comprises one or more solvents having a specific dielectric constant of greater than or equal to 30 and less than or equal to 50 and one or more solvents having a specific dielectric constant of less than 30, as measured by an alternate current-type dielectric constant measurement device at a temperature of 23° C. and a frequency of 10 kHz, as the solvent, and
wherein the sum of the solvents having a specific dielectric constant of greater than or equal to 30 and less than or equal to 50 is more than or equal to 5 mass % and less than or equal to 50 mass % and the sum of the solvents having a specific dielectric constant of less than 30 is more than or equal to 5 mass % and less than or equal to 20 mass %, when the total amount of the solvents is 100 mass %, and
wherein a molecular weight of the fluorine-based compound is less than or equal to 1000.
2. The aqueous base metal pigment dispersion liquid according to claim 1 ,
wherein a solvent, from which the base metal pigment was removed by centrifugal separation, has a specific dielectric constant of greater than or equal to 45 and less than or equal to 60, as measured by an alternate current-type dielectric constant measurement device, at a temperature of 23° C. and a frequency of 10 kHz.
3. The aqueous base metal pigment dispersion liquid according to claim 1 ,
wherein the base metal pigment has a scale-like shape.
4. The aqueous base metal pigment dispersion liquid according to claim 1 ,
wherein the fluorine-based compound has a perfluoroalkyl group.
5. The aqueous base metal pigment dispersion liquid according to claim 4 ,
wherein the perfluoroalkyl group has a carbon number of 1 to 6.
6. An aqueous ink composition, comprising:
a base metal pigment surface-treated with a fluorine-based compound; and
water as a part of a solvent,
wherein the aqueous ink composition further comprises one or more solvents having a specific dielectric constant of greater than or equal to 30 and less than or equal to 50 and one or more solvents having a specific dielectric constant of less than 30, as measured by an alternate current-type dielectric constant measurement device at a temperature of 23° C. and a frequency of 10 kHz, as the solvent, as the solvent, and
wherein the sum of the solvents having a specific dielectric constant of greater than or equal to 30 and less than or equal to 50 is more than or equal to 5 mass % and less than or equal to 50 mass % and the sum of the solvents having a specific dielectric constant of less than 30 is more than or equal to 5 mass % and less than or equal to 20 mass %, when the total amount of the solvents is 100 mass %, and
wherein a molecular weight of the fluorine-based compound is less than or equal to 1000.
7. The aqueous ink composition according to claim 6 ,
wherein a solvent, from which the base metal pigment was removed by centrifugal separation, has a specific dielectric constant of greater than or equal to 45 and less than or equal to 60, as measured by an alternate current-type dielectric constant measurement device at a temperature of 23° C. and a frequency of 10 kHz.
8. The aqueous ink composition according to claim 6 ,
wherein the base metal pigment has a scale-like shape.
9. The aqueous ink composition according to claim 6 ,
wherein the fluorine-based compound has a perfluoroalkyl group.
10. The aqueous ink composition according to claim 9 ,
wherein the perfluoroalkyl group has a carbon number of 1 to 6.
11. The aqueous ink composition according to claim 6 ,
wherein the aqueous ink composition does not substantially contain a polymerizable compound.