Ricoh Company, Ltd.

Masayuki Koyano

Kiyofumi Nagai

Tamotsu Aruga

Akihiko Gotoh

Akiko Bannai

Akio Kojima

Hitoshi Arita

Masato Igarashi

Akiko Konishi

Takanori Tsuyuki

Hiroyuki Mochizuki

Nobutaka Osada

Tetsuya Kaneko

Takao Hiraoka

Soh Noguchi

Eiji Noda

Tsutomu Maekawa

Okitoshi Kimura

Tomoko Hasegawa

Ikuko Tanaka

Kakuji Murakami

Naoya Morohoshi

Noriyasu Takeuchi

Mio Kumai

Shinya Seno

Azumi Miyaake

Tomoko Maeda

Akihiko Matsuyama

Toshiroh Tokuno

Tohru Ohshima

Yuuki Mizutani

Megumi Kawahara

Hiroshi Goto

Michihiko Namba

Shun Saito

Masayuki Shoshi

Hisashi Habashi

Ayano Momose

Ikuko Yamada

Kaori Miyahara

Yumi Ichikawa

Masaomi Sasaki

Takashi Okada

Yasuo Suzuki

Takayuki Shimizu

Satoshi Kojima

Hiroki Kobayashi

Eiji Kurimoto

Tomohiro Inoue

Hiroki Hagiwara

Takaaki Ikegami

Katsuichi Ohta

Kiminori Masuda

Mihoko Matsumoto

Kaoru Teramura

Amika Sagara

Kaoru Tadokoro

Takashi Rokutanzono

Maiko Koeda

Yuri Haga

Hiroki Nakane

Shin-ya Seno

Norlyasu Takeuchi

Provided is an ink containing at least: an inorganic pigment having a surface hydrophobicity; resin particles; and water.

Inkjet recording method and inkjet recording apparatus

An ink includes water, a coloring material, an organic solvent having a solubility parameter of from 8.0 to 13.0, an urethane resin particle and a metal ion, wherein the organic solvent having the solubility parameter of from 8.0 to 13.0 has a proportion of from 10.0% by mass to 30.0% by mass to the ink, where the metal ion is at least one selected from an alkali metal ion and an alkaline earth metal ion, where the metal ion has a proportion of from 4000 mg/L to 8000 mg/L to the ink.

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

An active-energy-ray-curable composition, a cured material of the active-energy-ray-curable composition satisfying a critical load of 5.0 g or more but 25.0 g or less, the critical load being obtained by a continuous loading test method using a variable normal load friction and wear measurement device, the cured material having an average thickness of 10 &#x3bc;m and being formed by coating the active-energy-ray-curable composition on a substrate and by irradiating and curing the active-energy-ray-curable composition with active energy rays having illuminance of 1.5 W/cmand an amount of irradiation of 200 mJ/cm.

Active-energy-ray-curable composition, active-energy-ray-curable ink, two-dimensional or three-dimensional image forming method, two-dimensional or three-dimensional image forming apparatus, and cured material

An active-energy-ray-curable composition including active-energy-ray-polymerizable compounds, wherein the active-energy-ray-polymerizable compounds include a monofunctional monomer, a bifunctional monomer, and a trifunctional monomer, and wherein the monofunctional monomer, the bifunctional monomer, and the trifunctional monomer satisfy conditions (1) and (2) below: (1) [number of functional groups derived from the monofunctional monomer]&#x3e;[number of functional groups derived from the bifunctional monomer]&#x3e;[number of functional groups derived from the trifunctional monomer]; and (2) a standard deviation of functional group ratios is from 0.003 through 0.030, the functional group ratios being expressed by [number of functional groups derived from N-functional monomer]/([number of functional groups derived from the monofunctional monomer]+[number of functional groups derived from the bifunctional monomer]+[number of functional groups derived from the trifunctional monomer]), the N being mono, bi, or tri.

Active-energy-ray-curable composition, active-energy-ray-curable ink, composition stored container, two-dimensional or three-dimensional image forming apparatus, two-dimensional or three-dimensional image forming method, cured material, and structure

Active-energy-ray-curable composition including: monofunctional monomers; and polymerization initiator, cured material of the composition satisfying 0.30&#x2266;D&#x2266;0.85, where D is difference between peak-area-ratios A and B in infrared-ATR and obtained by: the composition is coated on polycarbonate substrate to form coated film having average thickness of 10 &#x3bc;m; the film is irradiated with active energy rays having light quantity of 500 mJ/cmat UV intensity of 1.0 W/cmfor curing; the A is obtained from Formula (1) by infrared-ATR at one portion present from the cured material surface through 1 &#x3bc;m away therefrom toward the substrate, the B is obtained from Formula (1) by infrared-ATR at one portion present from the substrate-cured material interface through 1 &#x3bc;m away therefrom toward the cured material surface,Peak-area (from 1,679 mthrough 1,751 m/peak-area (from 1,096 mthrough 1,130 m)&#x2003;&#x2003;Formula (1), andthe A and B obtained are used to obtain D from Formula (2):=peak-area-ratio&#x2212;peak-area-ratio&#x2003;&#x2003;Formula (2).

Active-energy-ray-curable composition, active-energy-ray-curable ink, composition stored container, image forming method, image forming apparatus, cured material, and image formed matter

To provide a method of producing a film, comprising: ejecting a liquid B over a liquid surface of an active energy ray-curable liquid as a liquid A by an inkjet process, according to a predetermined periodic signal; and subsequently applying an active energy ray to the liquid A and the liquid B so as to perform curing and obtain a film which comprises a pattern according to any one of (1) to (4) below, (1) a smooth pattern having a periodic amplitude based upon a trigonometric function, (2) a pattern having a periodic depression, (3) a pattern in the form of a periodic flat surface, and (4) a pattern having a periodic semicylindrical shape.

Method of producing film by inkjet process, and film

An ink jet recording method including: applying at least two energy beam curable liquids different from each other in surface tension on a recording medium to form an energy beam curable liquid layer having a distribution pattern of different surface tensions; ejecting an energy beam curable ink on the energy beam curable liquid layer formed on the recording medium; and irradiating the energy beam curable liquid layer and the energy beam curable ink with energy beams to cure the energy beam curable liquid layer and the energy beam curable ink to form an image.

Ink jet recording method, ink jet recording apparatus, and ink jet recorded matter

An ultraviolet crosslinking ink including a radically polymerizable and anionically polymerizable monomer; a photoradical generator; and a photo-base generator. An inkjet recording method including ejecting an ultraviolet crosslinking ink including a radically polymerizable and anionically polymerizable monomer; a photoradical generator; a photo-base generator; and a colorant, toward a surface of a recording material to form an ink image, and irradiating the ink image with ultraviolet light using a light emitting diode.

Ultraviolet crosslinking ink and inkjet recording method

An ultraviolet crosslinking inkjet ink including a radically polymerizable monomer including a methacrylate and no acrylate; and a photoradical generator. An ink cartridge including the ultraviolet crosslinking inkjet ink and a container containing the ultraviolet crosslinking inkjet ink therein. An image forming method including ejecting droplets of the ultraviolet crosslinking inkjet ink toward a recording material to form an image on the recording material; and irradiating the image with ultraviolet light to crosslink the image. An image forming apparatus including a recording device to eject droplets of the ultraviolet crosslinking inkjet ink toward a recording material to form an image on the recording material; and an ultraviolet irradiator to irradiate the image with ultraviolet light to crosslink the image.

Ultraviolet crosslinking inkjet ink, ink cartridge containing same, and image forming method and apparatus using same

A method of ink jet recording including forming an uncured first ink layer of a first ultraviolet curable ink A on a recording medium, forming an uncured second ink layer having a recording pattern inside the uncured first ink layer of the ink A by discharging a second ultraviolet curable ink B from an ink jet head, and curing the uncured first ink layer by irradiating the uncured first ink layer with ultraviolet light after forming the uncured second ink layer, wherein the ink A contains a photoradical generator and the ink B contains a photobase generator and a coloring agent.

Ink jet recording method

An ink for inkjet recording containing water, water-soluble organic solvent, water-dispersible resin, fluorochemical surfactant or derivative thereof, and coloring agent containing pigment, where the ink has a surface tension of 20-35 mN/m and viscosity of &#x2267;5 mPa&#xb7;s at 25&#xb0; C., total amount of the water-dispersible resin and the coloring agent in the ink is 5-40% by mass, and mass ratio A/B of the water-dispersible resin A to the coloring agent B is 0.5-4, where the ink is applied to a recording medium containing a support containing cellulose pulp, and one or more barrier layers disposed on a face of the support, and where the barrier layer contains &#x2267;30% by mass of inorganic pigment having refractive index of &#x2267;1.5, excluding aluminum hydrate, and &#x2266;10% by mass of inorganic pigment having a refractive index of &#x3c;1.5.

Ink for inkjet recording, ink set for inkjet recording, ink media set for inkjet recording, ink cartridge, inkjet recording method, and inkjet recording apparatus

An ink set includes at least two aqueous inks A and B with different colors, the inks A and B used in an inkjet recording method in which the inks A and B are superimposed for formation of a color image, wherein the ink A contains water-dispersible colorant A1 free of a surfactant-based dispersant, and anionic compound A2, and wherein the ink B contains water-dispersible colorant B1 containing a surfactant-based dispersant.

Ink set, ink cartridge, inkjet recording method, and inkjet recording apparatus

A recording ink containing at least a solid component which contains a colorant and a resin and is a solid at 25&#xb0; C., a liquid component which has a higher boiling point than that of water and is a liquid at 25&#xb0; C. and water, wherein the total content of the liquid component in the recording ink is 20% by mass or less, the total content of the solid component in the recording ink is 20% by mass or more, and the total content of a resin component in the solid component is 40% by mass to 95% by mass relative to a total amount of the solid component is provided.

Recording ink as well as ink media set, ink cartridge, ink recorded matter, inkjet recording apparatus and inkjet recording method

To provide an ink for inkjet recording containing water, water-soluble organic solvent, water-dispersible resin, fluorochemical surfactant or derivative thereof, and coloring agent containing pigment, wherein the ink has a surface tension of 20-35 mN/m and viscosity of 5 mPa&#xb7;s or more at 25&#xb0; C., total amount of the water-dispersible resin and the coloring agent in the ink is 5-40% by mass, and mass ratio A/B of the water-dispersible resin A to the coloring agent B is 0.5-4, wherein the ink is applied for a recording medium for inkjet recording containing a support containing cellulose pulp, and one or more barrier layers disposed on at least one face of the support, and wherein the barrier layer contains 30% by mass or more of inorganic pigment having refractive index of 1.5 or more, excluding aluminum hydrate, and 10% by mass or less of an inorganic pigment having a refractive index of less than 1.5.

An ink-jet recording process which conducts recording by imparting ink onto the surface of a recording medium according to recording information, where the recording medium has a base material and a porous ink receiving layer thereon containing inorganic particles having a BET specific surface area of at least 150 m/g, and the ink contains a polymer emulsion having a water-insoluble or hardly-soluble colorant contained in polymer fine particles and at least one wetting agent, 8-11 C polyol or glycol ether, anionic or nonionic surfactant, water-soluble organic solvent, and water; and has a surface tension of 40 mN/m or less at 25&#xb0; C. This process can provide high-grade images excellent in ink absorbing and fixing properties and satisfactory in color tone, produce images excellent in image fastness such as water resistance and light resistance, and implement ink-jet recording excellent in storage stability and discharge stability and free from head clogging at printing.

Ink jet recording method, recording device, ink/recording medium set, recording matter

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Kanagawa, Japan

Masayuki Koyano