Active energy ray curable composition, ink, composition stored container, and two-dimensional or three-dimensional image forming apparatus
An active energy ray curable composition includes an inorganic pigment and a polymerizable monomer, wherein the inorganic pigment is carbon black having a ratio of the amount of hydrophilic functional group to the specific surface area in a range of from 7 μmol/m 2 to 42μmol/m 2 or a metal oxide having a ratio of the amount of sulfonic acid group to the specific surface area in a range of from 7 μmol/m 2 to 85 μmol/m 2 , wherein the active energy ray curable composition has a viscosity change rate (ΔV) represented by the following relation 1 from −10 percent by mass to +10 percent by mass: Δ V (%)=| V−V 0 |/V 0 ×100 relation 1, where V 0 represents an initial viscosity at 25 degrees C. and V represents a storage viscosity after the active energy ray curable composition is stored still at 70 degrees C. for 14 days.
1. An active energy ray curable composition comprising:
an inorganic pigment; and
a polymerizable monomer,
wherein the inorganic pigment is carbon black having a ratio of an amount of hydrophilic functional group to a specific surface area in a range of from 8.2 μmol/m 2 to 42 μmol/m 2 or a metal oxide having a ratio of an amount of sulfonic acid group to a specific surface area in a range of from 7 μmol/m 2 to 85 μmol/m 2 ,
wherein the active energy ray curable composition has a viscosity change rate (ΔV) represented by the following relation 1 from −10 percent by mass to +10 percent by mass:
Δ V (%)=| V−V 0 |/V 0 ×100 relation 1,
where V 0 represents an initial viscosity at 25 degrees C. and V represents a storage viscosity after the active energy ray curable composition is stored still at 70 degrees C. for 14 days.
2. The active energy ray curable composition according to claim 1 , wherein the viscosity change rate (ΔV) is from −5% by mass to +5% by mass.
3. The active energy ray curing type composition according to claim 1 , wherein the carbon black is surface-treated with a sulfonating agent.
4. The active energy ray curing type composition according to claim 3 , further comprising a polymeric dispersant wherein a dispersant adsorption amount to the carbon black is at least 1.0 mg/m 2 .
5. The active energy ray curable composition according to claim 1 , wherein the metal oxide is titanium oxide.
6. The active energy ray curable composition according to claim 5 , wherein the titanium oxide is surface-treated with an alkylhalogen compound having a sulfonic acid group.
7. The active energy ray curable composition according to claim 1 , further comprising a polymeric dispersant.
8. The active energy ray curable composition according to claim 7 , wherein the polymeric dispersant is a polymer having a basic polar functional group.
9. The active energy ray curable composition according to claim 1 , wherein the polymerizable monomer has a solubility parameter (SP) value of 9.5 or higher.
10. An ink comprising:
the active energy ray curable composition of claim 1 .
11. The ink according to claim 10 , wherein the ink is used for inkjet printing.
12. A composition-stored container comprising:
the active energy ray curable composition of claim 1 .
13. A two-dimensional or three-dimensional image forming apparatus comprising:
the composition-stored container of claim 12 .