Ricoh Company, Ltd.

Mariko Kojima

Akihiko Gotoh

Kiyofumi Nagai

Michihiko Namba

Akiko Bannai

Hisashi Habashi

Tomohiro Inoue

Yoshihiro Norikane

Keiko Osaka

Mitsuru Naruse

Yuuki Yokohama

Masaki Watanabe

Tamotsu Aruga

Yasuyuki Yamashita

Hiroshi Iwata

Hidefumi Nagashima

Teruki Kusahara

Kiminori Masuda

Masaki Kudoh

Tomohiro Nakagawa

Nozomu Tamoto

Akihiko Matsuyama

Naoya Morohoshi

Keita Katoh

Hiroshi Gotou

Takashi Tamai

Tsutomu Maekawa

Ichiroh Fujii

Tohru Ohshima

Tomohiko Kohda

Naoko Kitaoka

Provided is a three-dimensional object formation method for forming a three-dimensional object by at least repeating: forming a powder material layer using a powder material for three-dimensional object formation containing a base material coated with an organic material; and hardening a predetermined region of the powder material layer by delivering a hardening liquid to the powder material layer formed in the formation of a powder material layer, where the hardening liquid contains a cross-linking agent cross-linkable with the organic material.

Formation method of three-dimensional object with metal and/or ceramic particles and thin organic resin

Powder material for three-dimensional object formation, hardening liquid and three-dimensional object formation kit, and formation method and formation apparatus of three-dimensional object

Provided is a liquid material for forming a three-dimensional object. The liquid material is adapted to harden a powder material for forming a three-dimensional object containing an organic material. The liquid material contains a solvent and a cross-linking agent. A dynamic contact angle of the liquid material over a film made of the organic material is from 20&#xb0; to 80&#xb0;.

Liquid material for forming three-dimensional object and material set for forming three-dimensional object, and three-dimensional object producing method

Provided is a liquid material for forming a three-dimensional object, the liquid material adapted to be delivered to a powder material for forming a three-dimensional object to harden the powder material, the powder material containing an organic material and a base material, the liquid material including a cross-linking agent cross-linkable with the organic material and a resin having a glass transition temperature of 50&#xb0; C. or higher or a melting point of 50&#xb0; C. or higher.

Liquid material for forming three-dimensional object and material set for forming three-dimensional object, and three-dimensional object producing method and three-dimensional object producing apparatus

An inkjet recording method includes forming an image on a coated layer provided at least one side of the substrate of a recording medium with ink containing a colorant; and then applying a post-processing fluid comprising a resin to the image; wherein the application amount per unit area of the post-processing fluid to the image is controlled to be less than the application amount per unit area of the ink to form the image.

Inkjet recording method and inkjet recording device

An inkjet recording method, containing: applying a stimulus to an inkjet recording ink to jet the ink, to form an image on a recording medium, wherein the ink contains water, a water-soluble organic solvent, a colorant, and a surfactant, and has a predetermined surface life time as measured by a maximum bubble pressure method and a predetermined static surface tension, wherein the recording medium contains a support, and a recording layer provided at least one surface of the support, where the recording layer contains a cationic resin in a predetermined amount, and is a medium for a concealing postcard where the recording medium is folded to bond a surface of the recording layer to face each other with an adhesive after information is recorded on the surface of the recording layer, in which the surface of the recording layer has a predetermined 10-sec Cobb size degree.

Inkjet recording method, inkjet recording device, and ink recorded matter

Ink containing a pigment, an alcohol alkoxylate-based surfactant, a water-soluble organic solvent, water, and a dispersion agent represented by the following chemical structure 1, wherein the ink has a dynamic surface tension of 36 mN/m or less when the life of foam at 25&#xb0; C. as measured by the maximum bubble pressure technique is 15 msec: where Rrepresents an alkyl group having one to four carbon atoms, an aryl group, and an aralkyl group having one to eight carbon atoms, L represents zero or an integer of from 1 to 7, and n represents an integer of from 20 to 80.

Ink for inkjet recording, inkjet recording method using the ink, and ink cartridge that accommodates the ink

An inkjet recording method is performed using an inkjet recording device including a recording head provided with a nozzle, a pressure chamber, a pressure generator and a driving signal generator, the method satisfying the following requirements (1) and (2): (1) it is required to use aqueous ink having a dynamic surface tension larger by 10 mN/m or more than a static surface tension when the surface life measured at 25&#xb0; C. by a maximum foaming pressure method is 15 ms and a dynamic surface tension larger by 5 mN/m or more than a static surface tension when the surface life measured by a maximum foaming pressure method is 1500 ms and (2) it is required that the signals have a drawing pulse in one print period and a meniscus of the aqueous ink is drawn into the nozzle in two stages by the drawing pulse.

Inkjet recording method, inkjet recording device, and recorded material

An ink jet recording method including attaching a liquid dispersant in which an amphoteric polymer containing a core portion having a cation group and a shell portion having an anion group that covers the core portion is dispersed in a dispersing medium to a recording medium and discharging and attaching cationic ink containing a coloring material and water to the surface of the recording medium to which the liquid dispersant is attached.

Ink jet recording method and liquid dispersant

An ink jet recording method including attaching a liquid dispersant in which an amphoteric polymer containing a core portion having an anion group and a shell portion having a cation group that covers the core portion is dispersed in a dispersing medium to a recording medium and discharging and attaching anionic ink containing a coloring material and water to the surface of the recording medium to which the liquid dispersant is attached.

An inkjet recording ink containing a colorant, a surfactant A, a surfactant B, a water soluble organic solvent, and water, wherein the surfactant A is expressed by any one of Structural Formula (1) and Structural Formula (2), and the surfactant B is expressed by Structural Formula (3): in Structural Formula (1), R1 represents hydrogen, an alkyl group, or an acyl group; Rf represents &#x2014;CFor &#x2014;CFCF; and m, n and p are natural numbers; in Structural Formula (2), M represents alkali metal, ammonium, phosphonium, or alkanolamine; Rf represents &#x2014;CFor &#x2014;CFCF; and q is a natural number; in Structural Formula (3), Rand Reach represent hydrogen or an alkyl group; and r, s, t and u are natural numbers. 

Inkjet recording ink, inkjet recording inkset, ink cartridge, inkjet recording method, and recorded matter

An inkjet recording ink including at least a pigment, fine resin particles, a water soluble organic solvent, and water, wherein a polymer chain is grafted onto a surface of the pigment, and the polymer chain is composed of at least one monomer unit, which is selected from the monomers represented by the following Chemical Formulas (1) to (4): Chemical Formula (1) where R1 represents H or CH3, and 'n' represents the number of carbon atoms; Chemical Formula (2) where R2 and R3 each represent H or CH3, and 'm' represents the number of units repeated; Chemical Formula (3) where R4 and R5 each represent H or CH3, and &#x201c;p&#x201d; is the number of units repeated; and Chemical Formula (4) where R6 and R7 each represent H or CH3, and &#x201c;k&#x201d; and &#x201c;l&#x201d; each represent the number of units repeated. 

Inkjet recording ink, ink cartridge, inkjet recording apparatus, and ink recorded matter

The present invention provides a recording ink set containing a black ink, a cyan ink, a magenta ink, and a yellow ink, each of which contains water, a water-insoluble color material, a water-soluble organic solvent, and a surfactant, wherein the black ink and at least one of the inks other than the black ink respectively contain a different water-soluble organic solvent; and the surface tension of the water-soluble organic solvent(s) used only for the inks other than the black ink is higher than that of the water-soluble organic solvent used only for the black ink; and the present invention also provides a recording method using the recording ink set.

Recording ink, recording ink set, records, ink cartridge, recording method, and inkjet recording apparatus

There is provided an ink for recording, which contains: a coloring agent; a water-dispersible resin; a wetting agent; a surfactant; and water, wherein a total solid content of the coloring agent and the water-dispersible resin is 10% by mass to 30% with respect to a total mass of the ink, a ratio B/C is 0.1 to 1.6 where B is a solid content of the coloring agent in the ink, and C is a solid content of the water-dispersible resin in the ink, a viscosity of the ink is 5 mPa&#xb7;s to 20 mPa&#xb7;s at 25&#xb0; C., and a surface tension of the ink is 35 mN/m or less.

Ink for recording, and ink cartridge, ink recorded matter, inkjet recording apparatus and inkjet recording method using the same

The present invention provides an inkjet recording inkset including a black ink; and at least one color ink, wherein the black ink and the color ink respectively contains a coloring material, water, a water-soluble organic solvent and a surfactant, and wherein the black ink contains, as the coloring material, a water-dispersible carbon black having a hydrophilic group on its surface, which can be dispersed without using a dispersing agent, and only the color ink contains, as the surfactant, a fluorine surfactant expressed by Chemical Formula 1: Chemical Formula 1 where Rf represents a fluorine-containing alkyl group; R1 represents an anionic group; R2 represents a cationic group; and q represents a positive integer. 

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Tokyo, Japan

Mariko Kojima