Ricoh Company, Ltd.

Teruki Kusahara

Hiroshi Yamashita

Junichi Awamura

Satoshi Ogawa

Daisuke Ito

Daisuke Inoue

Masaki Watanabe

Nozomu Tamoto

Osamu Uchinokura

Satoshi Kojima

Tsuyoshi Sugimoto

Mamoru Hozumi

Tsuneyasu Nagatomo

Mariko Kojima

Tatsuya Niimi

Yasuo Suzuki

Yoshihiro Norikane

Tomomi Suzuki

Syouko Satoh

Mitsuru Naruse

Shoko Sato

Hitoshi Iwatsuki

Ryota Inoue

Fumihiro Sasaki

Yasuyuki Yamashita

Takahiro Honda

Takuya Saito

Takeo Yamaguchi

Keiko Osaka

Shizuka Kohzuki

Hiroki Nakane

Kiwako Hirohara

Toshihiko Karato

Yasutada Shitara

Hyo Shu

Masaaki Oka

Yoichi Sakurai

Tomoyuki Satoh

Kazumi Ohtaki

Ryuuta Yoshida

Kohichiroh Tanaka

Koshi Sato

Ryuta Yoshida

Yasuaki Ohta

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

A solid freeform fabrication material set includes a material A for solid freeform fabrication and a material B for solid freedom fabrication. The material A includes a polymerization initiator A and at least one of an organic particle and an inorganic particle. The material B includes a polymerizable compound B.

Solid freeform fabrication material set, method of fabricating solid freeform object, method of fabricating dental prosthesis, and device for fabricating solid freeform object

A material set for manufacturing a glass object includes a powder material including glass and a first water soluble resin; and a liquid material including water and a second water soluble resin having a mass average molecular weight of less than 50,000.

Material set for manufacturing glass object, liquid material for manufacturing glass object, method of manufacturing glass object, glass object, and device for manufacturing glass object

Provided is a three-dimensional object formation powder material used for three-dimensional object formation of forming a three-dimensional object by stacking up a plurality of powder material layers each bound by a resin and having a predetermined shape. The three-dimensional object formation powder material contains particles in which a plurality of cores are fixed by a water-soluble resin.

Three-dimensional object formation powder material, three-dimensional object formation material set, and three-dimensional object production method

An active energy ray image forming apparatus containing a head, a heating mechanism disposed inside the head, and a storing part configured to accommodate a non-polymerizable synthetic resin and a mono-functional monomer containing a single unsaturated ethylene double bond. An active energy ray image forming apparatus, containing a head, a heating mechanism disposed inside the head, and a storing part configured to accommodate a non-polymerizable synthetic resin and a mono-functional monomer containing a single unsaturated ethylene double bond, where the heating mechanism is heated to 60&#xb0; C. when ink is discharged.

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

An active energy ray curable composition includes a non-polymerizable resin; and polymerizable compounds comprising a mono-functional monomer having a single polymerizable unsaturated ethylene double bond, wherein the following relations are satisfied: &#x394;Tg=|Tg&#x2212;Tg}&#x2267;19 degrees C., where Tgrepresents a glass transition temperature of the non-polymerizable resin and Tgrepresents a glass transition temperature of a homopolymer of the mono-functional monomer, Tg&#x2267;10 degrees C., where Tgrepresents the higher of Tgand Tg, and Tg&#x2266;40 degrees C., where Tgrepresents the lower of Tgand Tg.

A toner including a non-crystalline polyester resin and a crystalline polyester resin, wherein a tetrahydrofuran soluble component of the non-crystalline polyester resin has a weight-average molecular weight of 3,000 to 8,000 measured by gel permeation chromatography, and wherein the toner has a glass transition temperature A before an extraction process of the toner with methanol and a glass transition temperature B after the extraction process of the toner with methanol, and a difference between A and B (B&#x2212;A) is 2.0&#xb0; C. or less.

Toner and developer

A toner set, including: a transparent toner including a binder resin a, a releasing agent a and no colorant; and one or more color toners, each including a binder resin b, a colorant b and a releasing agent b, wherein the binder resin a includes a non-crystalline resin &#x3b1; and a crystalline resin &#x3b1;, the binder resin b includes a non-crystalline resin &#x3b2; and a crystalline resin &#x3b2;, the releasing agent a has an average particle diameter as a long diameter of 0.2 &#x3bc;m to 2.0 &#x3bc;m, and there is a relationship of 1&#x3c;A/B&#x3c;1.5, where A is an area of the releasing agent a in a transparent toner cross-section from a surface thereof to a &#x2153;-depth of a volume-average particle diameter, and B is an area of the releasing agent b in a color-toner cross-section from a surface thereof to a &#x2153;-depth of a volume-average particle diameter.

Toner set, developer set, and image forming apparatus

A toner including a binder resin which contains a crystalline polyester resin and a non-crystalline polyester resin, wherein the crystalline polyester resin has at least two diffraction peaks in a range of 20&#xb0;&#x3c;2&#x3b8;&#x3c;25&#xb0; as detected by X-ray diffraction measurement, and has a melting point which is 60&#xb0; C. or higher but lower than 80&#xb0; C., and wherein the diffraction peaks each have a half width which is less than 1.0&#xb0;.

Toner containing crystalline polyester

An image forming apparatus including: image bearing member; latent image forming unit; developing unit; transfer unit; fixing unit, wherein toner in the developing unit contains amorphous polymer, crystalline resin and releasing agent, when the toner is measured for G' at 40&#xb0; C. to 210&#xb0; C. with rheometer at 1 Hz and 1 deg, G&#x2032;(100) is &#x2266;20,000 and G&#x2032;(150) is &#x2267;500 Pa, and straight line drawn by connecting points of the G&#x2032;(100) and G&#x2032;(110) on curve of the G&#x2032; has gradient of &#x2266;0.035, the gradient being 'a' expressed by: a=|logG&#x2032;(100)&#x2212;logG&#x2032;(110)|/10, and the fixing unit includes: heating member containing flexible endless belt; heat source fixed within the flexible endless belt; and press member in contact with the belt to form nip portion, and the fixing unit is configured to heat/press the medium passing through the nip portion to fix the image on the medium.

Image forming apparatus

A toner for developing an electrostatic image, including: toner base particles each including a binder resin and a releasing agent; and inorganic fine particles, wherein the toner includes the inorganic fine particles as an external additive on a surface of the toner base particle, wherein the toner base particles have a BET specific surface area of 2.5 m/g to 5.0 m/g, and wherein the inorganic fine particles comprise inorganic fine particles (A) which are each a secondary particle where a plurality of primary particles are coalesced together.

Toner for developing electrostatic image, two-component developer and image forming apparatus

To provide a toner, which contains a binder resin, a colorant, and a releasing agent, wherein the binder resin contains a low molecular weight resin component, where the low molecular weight resin component has a resin softening coefficient (A), represented by the following formula (1), satisfying A&#x3e;0.165, and has storage elastic modulus (dyne/cm) G'(Tfb) satisfying G&#x2032;(Tfb)&#x2266;1&#xd7;10where Tfb is a flow onset temperature (&#xb0; C.) of the low molecular weight resin component as measured by a capillary rheometer:=|[(1)&#x2212;ln&#x2032;(2)]/(1&#x2212;2)|&#x2003;&#x2003;Formula (1)(where T1 is temperature (&#xb0; C.) at which storage elastic modulus G&#x2032;(r1) is 1&#xd7;10(dyne/cm) and T2 is temperature (&#xb0; C.) at which storage elastic modulus G&#x2032;(r2) is 1&#xd7;10(dyne/cm) as measured by means of a viscoelasticity measuring device with measuring frequency of 1 Hz, and measuring distortion of 1 deg; and | | represents an absolute value.).

Toner for electrostatic charge development

A set of toners including yellow, cyan, magenta, and black toner, each of which containing a binder resin containing a crystalline resin and a non-crystalline resin, a releasing agent, and a corresponding coloring agent, wherein the following relationship is satisfied: 0.8&#x3c;EBk/EFc&#x3c;0.95, where EBk represents the amount of heat of melting (mJ/mg) for the black toner and EFc represents the average amount of heat of melting (mJ/mg) of the yellow toner, magenta toner, and cyan toner from 50&#xb0; C. to 100&#xb0; C. at the first temperature rising in differential scanning calorimetry (DSC).

Toner, process cartridge, and image forming apparatus

The present invention provides a method for producing a toner, the method including: preparing a wax dispersion liquid by cooling a wax solution, in which a wax is heated and dissolved or dispersed in an organic solvent, in a container so that a standard deviation &#x3c3; of a temperature distribution between a center portion of the container and an inner wall of the container is 0.5 or less and the cooling rate is 2.0&#xb0; C./min or more, to precipitate wax particles in the wax solution; forming toner base precursor particles by adding an aqueous phase containing resin fine particles into an oil phase containing at least the wax dispersion liquid, a colorant and a binder resin and mixing the oil phase and the aqueous phase with each other; and preparing toner base particles by removing the solvent from the toner base precursor particles.

Toner, and production method of the same

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Shizuoka, Japan

Teruki Kusahara