Dic Corporation

Tatsushi Okuda

Hiroshi Kinoshita

Yoshinobu Sakurai

Sei Yamamoto

Koichi Yamaguchi

Keisuke Wakahara

Yoshinobu Deguchi

Yukie Suwa

Yumiko Nakamura

Kutzner Fabian

Gaudl Kai-uwe

Fabian Kutzner

The present invention provides an active energy ray-curable composition exhibiting high curability and having excellent offset printability when used for a printing ink, an active energy ray-curable printing ink having both excellent curability and offset printability, and a printed matter using the same. An active energy ray-curable composition includes a urethane (meth)acrylate resin (A) and a polymerization initiator (B), wherein the urethane (meth)acrylate resin (A) is produced by using an aromatic polyisocyanate (a), a hydroxyl group-containing mono(meth)acrylate (b), and a polyol (c) as essential reaction raw materials so that the ratio [(b')/(a&#x2032;)] of the number of moles (b&#x2032;) of hydroxyl groups contained in the hydroxyl group-containing mono(meth)acrylate (b) to the number of moles (a&#x2032;) of isocyanate groups contained in the aromatic polyisocyanate (a) is within a range of 0.99 to 0.40, and the urethane (meth)acrylate resin (A) has a (meth)acryloyl group concentration within a range of 1.5 to 4.0 mmol/g.

Active energy ray-curable composition, active energy ray-curable printing ink using same, and printed matter

The present invention provides a Michael addition reaction product between a specified compound having a group which functions as a Michael donor and a monomer or polymer having a group which functions as a Michael acceptor, a photoinitiator containing the Michael addition reaction product, and an active energy ray-curable composition containing the photoinitiator. The compound having a group functioning as a Michael donor used in the present invention is a phenyl ketone derivative and is characterized by having an amino group or a mercapto group as the group functioning as a Michael donor.

Michael addition reaction product and active energy ray-curable composition

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

Tatsushi Okuda