Ricoh Company, Ltd.

Yuuki Matsushita

Hiroki Kobayashi

Shin Hasegawa

Satoshi Kojima

Yukiko Ishijima

Takayuki Shimizu

Masato Iio

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

An ink is provided that comprises wafer and a dye having a triazine skeleton. The ink satisfies Expression (1):≤−403+3400  Expression (1)

Ink, method for producing ink, and inkjet system

Provided is an active-energy-ray-curable ink including at least a surface tension modifier and including a monomer having a surface tension of 39 mN/m or greater in an amount of 20% by mass or greater but 60% by mass or less. Preferably, the ink includes a monomer having a surface tension of 43 mN/m or greater in an amount of 5% by mass or greater but 10% by mass or less.

Ink, ink set, ink container, recording method, and recording apparatus

A curable composition contains a polymerizable compound and a polymerization initiator containing pheylbis(2,4,6-trimethyl benzoyl)phosphine oxide and diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide in a mass ratio of pheylbis(2,4,6-trimethyl benzoyl)phosphine oxide:diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide from 1:6 to 1:160, wherein supernatant obtained after the curable composition is centrifuged for 30 minutes at 70,000 rotation per minute has an absorbance of 0.02 or less at a wavelength of 700 nm.

Curable composition, accommodating unit, device for forming two or three dimensional image, method of forming two or three dimensional image, and cured matter

A curable composition contains a polymerizable compound, a polymerization initiator, and a fluorescent whitener comprising a benzoxazole derivative, wherein the proportion of the fluorescent whitener is from 0.10 to 0.3 percent by mass and the proportion of the polymerization initiator is from 5 to 15 percent by mass.

A curable clear ink composition is provided. The curable clear ink composition comprises a surfactant, a monofunctional polymerizable compound having a static surface tension of 33 mN/m or less at 25 degrees C. in an amount of 10% by mass or more but 30% by mass or less, an oligomer having a weight average molecular weight (Mw) of 1,000 or more, and an acylphosphine oxide polymerization initiator in an amount of 8% by mass or more but 12% by mass or less.

Curable clear ink composition, storing container, ink set, printing method, printed matter, and cured material

An active energy ray-curable composition is provided. The active energy ray-curable composition comprises a polymerizable compound and a polymerization initiator. The polymerizable compound comprises isobornyl acrylate. The active energy ray-curable composition gives, when centrifuged with a centrifugal force of 8&#xd7;10g, a supernatant with an absorbance at a wavelength of 700 nm of 0.02 or lower.

Active energy ray-curable composition, active energy ray-curable inkjet ink, composition storage container, inkjet discharging apparatus, and cured product

A composition is provided including an acrylamide compound having an ester structure and a molecular weight of 150 to 200, and a polysilane as a polymerization initiator.

Composition, cured product, composition stored container, image forming apparatus, and image forming method

A curable composition is provided. The curable composition comprises diethylene glycol dimethacrylate and a resin, and the following conditions (1) to (3) are satisfied:

Curable composition, curable ink, method for forming two-dimensional or three-dimensional images, apparatus for forming two-dimensional or three-dimensional images, cured product, structural body, and processed product

A curable composition includes a polymerizable compound containing diethylene glycol dimethacrylate and a mono-functional (meth)acrylate having an OH group and a resin, wherein the resin satisfies the following (1) and (2), (1). a viscosity at 25 degrees C. of a liquid mixture of 70 parts of the diethylene glycol dimethacrylate and 30 parts of the resin is 15 to 27 times greater than that of the diethylene glycol dimethacrylate alone, and (2). the liquid mixture has a spin-spin relaxation time of 240 ms or less as measured by Carr-Purcell-Meiboom-Gill (CPMG) of pulse Nuclear Magnetic Resonance (NMR) analysis.

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Kanagawa, Japan

Yuuki Matsushita