Ricoh Company, Ltd.

Dic Corporation

Sei Yamamoto

Kazuhiko Umemura

Hiroki Hagiwara

Tomohiro Nakagawa

Hiroshi Kinoshita

Masanori Miyamoto

Yuya Hirokawa

Takuya Saiga

Tomokazu Yamada

Yuusuke Fujita

Tatsushi Okuda

Youichi Tanimoto

Yuutaroh Nonaka

Yukie Suwa

Azusa Yogo

Akihiro Kondou

An ink contains water, Pigment Red 269, a compound represented by the following Chemical formula (1), and at least one of a silicone compound and an acetylene glycol compound, where the proportion of the compound represented by the following Chemical formula (1) to the Pigment Red 269 is 2.0 percent by mass or less: 

Ink, ink accommodating unit, printing device and printing method

A method of printing includes applying a processing fluid to a substrate and inkjet discharging a white ink to the substrate onto which the processing fluid has been applied, wherein the processing fluid contains a tri-valent metal salt, a nonionic urethane resin, and water and the white ink contains a white pigment, a resin, and water.

Method of printing including applying a processing fluid and white ink to a substrate and device for such printing

A compound obtained through Michael addition reaction of an &#x3b1;-aminoacetophenone skeleton-containing compound (I) represented by the following general formula (1) and a reactive compound (II) having a function as a Michael acceptor is used as a photopolymerization initiator. In the general formula (1), Rrepresents an aliphatic group, Rto Reach independently represent an aliphatic group, etc., Rto Reach independently represent a hydrogen atom, Xrepresents a single bond or a C1-6 alkylene group, Xrepresents a carbonyl group, Yand Yrepresent a group represented by the following general formula (2). However, when Yand Yboth have a structure represented by the general formula (2), Xin at least one of them is &#x2014;NH&#x2014;. In the general formula (2), Xand Xeach independently represent a linear or branched alkylene group having 2 to 6 carbon atoms, Xrepresents a single bond, &#x2014;O&#x2014; or &#x2014;NH&#x2014;. 

Compound, active energy ray curable composition, cured article thereof, printing ink, and inkjet recording ink

Disclosed is an active energy ray-curable ink composition comprising a coloring agent, a binder resin, and a radically polymerizable varnish and/or a radically polymerizable monomer as main components. The coloring agent is a modified pigment wherein the surface of a pigment (A) is provided with a polymer (P) which is obtained by polymerizing a polymer (B), which is soluble in nonaqueous solvents, with at least one polymerizable unsaturated monomer (C), which is originally soluble in nonaqueous solvents but becomes insoluble or poorly soluble after polymerization. Also disclosed is a printed matter which has a coating film obtained by curing and drying the active energy ray-curable ink composition.

Active energy ray-curable ink composition and printed matter

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Tokyo, Japan

Sei Yamamoto