Ricoh Company, Ltd.

Sonoh Matsuoka

Chiaki Tanaka

Naohiro Watanabe

Masahide Yamada

Masahiro Ohki

Akinori Saitoh

Ryota Inoue

Akihiro Kotsugai

Satoshi Mochizuki

Takuya Saito

Takeshi Takada

Ryohta Inoue

Hiroshi Yamashita

Tomoyuki Ichikawa

Shinya Nakayama

Koichi Sakata

Fumihiro Sasaki

Osamu Uchinokura

Yasuo Asahina

Hisashi Nakajima

Hideki Sugiura

Hiroto Higuchi

Shigeru Emoto

Yohichiroh Watanabe

Tsunemi Sugiyama

Masayuki Ishii

Tsuneyasu Nagatomo

A toner satisfying at least one of the following relationships:10&#xb0; C.&#x3c;(1&#x2212;2)&#x3c;60&#xb0; C. and 0&#x3c;2/1&#x3c;

Toner and image forming method using the toner

A toner satisfying at least one of the following relationships:10&#xb0; C.&#x3c;(1&#x2212;2)&#x3c;60&#xb0; C. and 0&#x3c;2/1&#x3c;2/3 wherein Trepresents a glass transition temperature of the toner and Qrepresents an endothermic quantity at a melting point thereof before melting when heated from &#x2212;20&#xb0; C. to 150&#xb0; C. at a heating speed of 10&#xb0; C./min, and Trepresents a glass transition temperature thereof and Qrepresents a an endothermic quantity at a melting point thereof after melting after heated from &#x2212;20&#xb0; C. to 150&#xb0; C. at a heating speed of 10&#xb0; C./min, cooled to &#x2212;20&#xb0; C. at a cooling speed of 10&#xb0; C./min and heated again at a heating speed of 10&#xb0; C./min.

There are provided: a method for producing a toner containing to granulate a toner and to subjecting the granulated toner to at least washing with an alkali washing solution, in which the total organic carbon amount extractable from the alkali-washed toner is 200 ppm/g or less; a toner comprising polyester in which the total organic carbon amount extractable from the toner is 200 ppm/g or less, under the condition that the toner is subjected to washing with the alkali washing solution before extracting; and an image-forming method using such a toner.

Toner and method for producing the same, and image-forming method using the same

A toner is provided containing a parent particulate material, which contains; 

Toner for developing electrostatic latent image, developer using the toner, and process cartridge, image forming apparatus and image forming method using the developer

An object of the present invention is to provide a toner having small-sized and potato-shaped particles created from multiple coherent spherical particles for excellent cleaning ability and high image quality, an image-forming method that realizes high image quality using the toner, and the like. To this end, there is provided a toner, which is produced by granulating toner materials as an organic phase comprising at least a binder resin and a colorant in an aqueous medium and has potato-shaped particles created from multiple coherent primary oil droplets of the organic phase in the aqueous medium.

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

It is an object of the present invention to provide a toner that can sustain favorable transferability and cleaning ability for prolonged periods; prevent photoconductor filming; exhibit no variation in image nonuniformity or external additive immersion induced by developer agitation at the time of use; excels in stability with flowability and charge stability over prolonged periods. Therefore, provided is the toner of which the quantity of aggregate of residual external additives found on the sieve of 635-mesh and 452 cmof mesh area, after 0.2 g of the toner on the sieve is blasted with air at a blow pressure of 0.2 MPa from 160 mm above the sieve while being air-suctioned at a suction force of 5 mmHg, and then air-suctioned at a suction force of 20 mmHg, is 4,500 or less and 5 or more.

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

A toner including a binder resin comprising a polyester resin in an amount of from 50 to 100% by weight, wherein the polyester resin includes an unsaturated polyester resin which is preferably a crystalline polyester resin; a colorant; and a fatty acid metal salt which is preferably microencapsulated. A method for preparing a toner including forming particles of a toner composition including at least a binder resin including a polyester resin in an amount of from 50 to 100% by weight and a colorant, in an aqueous medium to prepare a dispersion of a particulate material, wherein the polyester resin includes an unsaturated polyester resin; drying the particulate material; and mixing a fatty acid metal salt with the particulate material to subject double bonds of the unsaturated polyester resin to oxidation polymerization.

Toner containing unsaturated polyester in binder resin, method for preparing the toner, and developer including the toner

A toner including a binder; a colorant; and a wax, wherein the binder includes a polyester resin; and a reaction product of a polymer having a group capable of reacting with an active hydrogen with a compound having an active hydrogen, wherein the polyester resin includes tetrahydrofuran(THF)-soluble resin components in an amount of from 50 to 85% by weight; and chloroform-insoluble components in an amount of from 0 to 30% by weight, and wherein the toner satisfies the following relationship (1):5% by weight&#x3c;(C1-C2)&#x3c;60% by weight &#x2003;&#x2003;(1)wherein C1 represents a content of chloroform-insoluble components in the toner in units of % by weight and C2 represents a content of the colorant therein in units of % by weight.

Toner and method or preparing the toner

A toner containing toner particles having a core-shell structure containing a binder resin, a colorant and a release agent. The toner particles are prepared by dissolving or dispersing at least one of the binder resin and a precursor thereof in an organic solvent or a polymeric monomer and reacting the resultant in an aqueous medium for reaction, wherein the toner satisfies the following relationship: &#x394;Tm=Tm&#x2212;Tm&#x3e;10 &#xb0; C., wherein Tmrepresents half efflux temperature of the toner and Tmrepresents half efflux temperature of a toner which is prepared by melting and kneading the toner particles and wherein a content of the release agent existing close to the surface portion of the toner particles is from 7 to 30% by volume based on an entire portion close to the surface portion of the toner particles when the content is determined by Fourier Transform Infrared Spectroscopy Attenuated Total Reflection (FTIR-ATR) method.

Toner and fixing device and image forming device using the same

A toner including toner particles comprising a binder resin; and at least two kinds of particulate resins which are located on at least a surface of the toner particles, wherein the toner satisfies at least one of the following relationships (TgA-TgB)&#x2267;20&#xb0; C., wherein TgA and TgB represent glass transition temperatures (Tg) of a particulate resin (A) having a highest Tg and a particulate resin (B) having a lowest Tg among the at least two kinds of particulate resins, respectively; and 100,000&#x2266;Mwc&#x2266;6,000,000 and 8,000&#x2266;Mwd&#x2266;800,000, wherein Mwc and Mwd represent weight average molecular weights (Mw) of a particulate resin (C) having a highest Mw and a particulate resin (D) having a lowest Mw among the at least two kinds of particulate resins, respectively, wherein Mwc&#x3e;Mwd.

Toner, method for manufacturing the toner, developer including the toner, toner container containing the toner, and image forming method, image forming apparatus and process cartridge using the toner

A toner including toner particles comprising a binder resin; and at least two kinds of particulate resins which are located on at least a surface of the toner particles, wherein the toner satisfies at least one of the following relationships (TgA&#x2212;TgB)&#x2267;20&#xb0; C., wherein TgA and TgB represent glass transition temperatures (Tg) of a particulate resin (A) having a highest Tg and a particulate resin (B) having a lowest Tg among the at least two kinds of particulate resins, respectively; and 100,000&#x2266;Mwc&#x2266;6,000,000 and 8,000&#x2266;Mwd&#x2266;800,000, wherein Mwc and Mwd represent weight average molecular weights (Mw) of a particulate resin (C) having a highest Mw and a particulate resin (D) having a lowest Mw among the at least two kinds of particulate resins, respectively, wherein Mwc&#x3e;Mwd.

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Numazu, Japan

Sonoh Matsuoka