Ricoh Company, Ltd.

Keiko Osaka

Chiaki Tanaka

Ryota Inoue

Akihiro Kotsugai

Akiyoshi Sabu

Shingo Sakashita

Yukiko Nakajima

Yoshihiro Norikane

Yasuyuki Yamashita

Mariko Kojima

Mitsuru Naruse

Masaki Watanabe

Ryoichi Kitajima

Akira Suzuki

Nozomu Tamoto

Yoshitaka Yamauchi

Hiroshi Iwata

Taichi Nemoto

Teruki Kusahara

Toyoshi Sawada

Satoshi Mochizuki

Yoshihiro Moriya

Shinji Ohtani

Daiki Yamashita

Takeo Yamaguchi

Shinichiro Kawasaki

Tanaka Chiaki

A method for producing particles, the method including: depolymerizing a resin to obtain a depolymerized product; contacting the depolymerized product obtained in the depolymerizing with a first compressive fluid to obtain a melted product; and jetting the melted product obtained in the contacting to granulate the particles.

Method and apparatus for producing particles, particles, composition, particles dispersion liquid, and method for producing the particles dispersion liquid

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 used for forming a three-dimensional object made of a powder material for forming a three-dimensional object containing an organic material and a base material, wherein the liquid material contains a cross-linking agent cross-linkable with the organic material and a water-soluble resin having a weight average molecular weight of greater than or equal to 50,000.

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

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

A method for producing particles, which contains: bringing a compressive fluid and a pressure plastic material into contact with each other to melt the pressure plastic material; and jetting a melt obtained by melting the pressure plastic material to form particles, wherein the jetting the melt is performed by a two-fluid nozzle or three-fluid nozzle.

Particles and method for producing particles

To provide a method for producing particles, which contains: bringing a compressive fluid and a pressure plastic material into contact with each other using a multistage split flow micromixer, to thereby produce a melt of the pressure plastic material, in which the compressive fluid is dissolved; and jetting the melt of the pressure plastic material, to form particles, wherein the pressure plastic material is a resin having a carbonyl structure &#x2014;C(&#x2550;O)&#x2014;, and wherein a viscosity of the melt is 500 mPa&#xb7;s or lower, as measured under temperature and pressure conditions at the time of the jetting the melt of the pressure plastic material.

Method for producing particles and apparatus for producing particles

A particle manufacturing method of the present invention includes: ring-opening-polymerizing a ring-opening-polymerizable monomer after bringing the ring-opening-polymerizable monomer into contact with a first compressible fluid; and granulating a polymer obtained in the ring-opening-polymerizing by jetting the polymer and the first compressible fluid.

Particle manufacturing method, particles, and particle manufacturing apparatus

An electrostatic image developing toner including a toner particle (C), wherein the toner particle (C) has a structure in which a resin particle (A) containing at least a first resin (a) or a coated film (P) containing the first resin (a) is attached to a surface of a resin-containing particle (B) containing a second resin (b), and wherein the resin (b) includes a polyhydroxycarboxylic acid skeleton, and the resin (a) is a polyester resin containing a polybasic acid and a polyhydric alcohol.

Electrostatic image developing toner, developer, image forming apparatus, image forming method, and process cartridge

A toner including: a first binder resin; a colorant; a releasing agent; and a crystalline organic compound, wherein the first binder resin contains an amorphous polyester resin (a) having a polyhydroxycarboxylic acid skeleton derived from optically active monomers in a part of a main chain of the amorphous polyester resin, and the polyhydroxycarboxylic acid skeleton has an optical purity X, calculated on the monomer basis, of 80% or less, and the optical purity X is determined from the equation,Optical Purity(%)=|(-form)&#x2212;(-form)|

Toner, developer, and image forming method

A toner including a binder resin comprising a resin (a) comprising a polyhydroxycarboxylic acid skeleton formed from an optically-active monomer. The polyhydroxycarboxylic acid skeleton has a weight average molecular weight of from 7,000 to 60,000. The binder resin comprises the polyhydroxycarboxylic acid skeleton in an amount of from 10 to 90% by weight. The optical purity X (%) of the polyhydroxycarboxylic acid skeleton represented by the following formula is 80% or less:(%)=|(-isomer)&#x2212;(-isomer)|wherein X(L-isomer) and X(D-isomer) represent molar ratio (%) of L-isomer and D-isomer of the optically-active monomer, respectively.

Toner, color toner set, developer, process cartridge, and image forming method

To provide a toner including: a resin particle (C) containing a first resin (a1), a second resin (a2), and a resin particle (B) to a surface of which the first resin (a1) and the second resin (a2) are attached, wherein the first resin (a1) and the second resin (a2) have mutually different glass transition temperatures, and wherein the resin particle (B) contains a third resin (b) having an amorphous polyhydroxycarboxylic acid skeleton.

Toner, developer, image forming method and image forming apparatus

A toner including a colorant, a thermoplastic resin (a) comprising an amorphous polyester resin having a main chain having a polyhydroxycarboxylic acid skeleton, and a thermoplastic resin (b) is provided. The toner is manufactured by a method including mixing the colorant with the thermoplastic resin (a) to prepare a preliminary mixture, and mixing the preliminary mixture with the thermoplastic resin (b).

Toner, and developer, toner cartridge, image forming apparatus, process cartridge and image forming method using the same

A particle producing method is provided including bringing a material into contact with a compressible fluid to prepare a melt of the material, and discharging the melt from a vibrated through hole to form particles of the melt. A particle producing apparatus is also provided including a discharger to discharge the melt. The discharger includes a storage to store the melt, at least one through hole disposed on the storage, and a vibrator to vibrate the through hole. The particle producing apparatus further includes a particle forming member defining a space within which the discharged melt is formed into particles and a pressure controller controlling a pressure difference between the space and an inside of the storage so that the discharged melt is formed into a columnar melt and the columnar melt is constricted and separated into particles.

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Shizuoka, Japan

Keiko Osaka