Invention Grant
- Patent Title: Active energy ray curable composition, ink, composition stored container, and two-dimensional or three-dimensional image forming apparatus
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Application No.: US14867717Application Date: 2015-09-28
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Publication No.: US09701852B2Publication Date: 2017-07-11
- Inventor: Tomohiro Hirade , Tomohiro Inoue
- Applicant: Tomohiro Hirade , Tomohiro Inoue
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2014-208563 20141010; JP2015-127794 20150625
- Main IPC: C09D11/101
- IPC: C09D11/101 ; C09D11/322 ; C09D11/326

Abstract:
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/m2 to 42μmol/m2 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/m2 to 85 μmol/m2, 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: ΔV(%)=|V−V0|/V0×100 relation 1, where V0 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.
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