Ricoh Company, Ltd.

Yuusuke Fujita

Tomohiro Nakagawa

Satoshi Kojima

Hiroki Kobayashi

Yohta Sakon

Kazuhiko Umemura

Satoyuki Sekiguchi

Hiroki Hagiwara

Daisuke Asahina

Hiroko Ohkura

Akira Izutani

Yuuki Matsushita

Takumi Atake

Sei Yamamoto

Yuutaroh Nonaka

Hikaru Ishii

An active energy ray curing composition contains a polymerizable monomer having a phosphoric acid ester group and a polyester resin having an unsaturated bond and a number average molecular weight of 3,000 or less.

Active energy ray curing composition, comprising a polymerizable monomer and a polyester resin

A wiping member to wipe a nozzle surface of a liquid discharging head includes a first layer configured to be brought into contact with the nozzle surface and one or more other layers, wherein the following relation is satisfied: t1<t2, where t1 represents the thickness of the first layer and t2 represents the thickness of the one or more other layers, wherein the porosity of the first layer is smaller than the porosity of at least one of the one or more other layers.

Wiping member, wiping method, and image forming apparatus

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

An ink includes a solvent and a resin, wherein the storage elastic modulus G1 of an ink film obtained by drying the ink is 2.0&#xd7;10-5.0&#xd7;10Pa at 20 degrees C. as measured by a dynamic viscoelasticity measuring method and the ratio (G2/G1) of the storage elastic modulus G1 to the storage elastic modulus G2 of the ink film measured at 80 degrees C. by the dynamic viscoelasticity measuring method is 0.30-0.85.

Ink, ink container, inkjet recording method, inkjet recording device, and recorded matter

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Shizuoka, Japan

Yuusuke Fujita