Ricoh Company, Ltd.

Shinya Hanatani

Tsuyoshi Sugimoto

Naohiro Watanabe

Mamoru Hozumi

Osamu Uchinokura

Yoshitaka Sekiguchi

Hisashi Nakajima

Masashi Nagayama

Saori Yamada

Mariko Takii

Tomoyuki Sato

Tomoyuki Satoh

Hiroshi Hosokawa

Kenji Kikuchi

Shinji Tamaki

Shunji Katoh

Masayuki Ishii

Hideki Sato

Takashi Tanaka

Hiroshi Ikeguchi

Michiharu Suzuki

Hyo Shu

Shigeo Hatada

Tetsuya Tanaka

Masami Iguchi

Kiwako Hirohara

Kaoru Aoki

Hiroki Morioka

Makoto Hirai

Moriaki Saito

Hideki Satoh

Michio Urata

A toner comprising base particles and external additive particles covering the base particles is provided. The base particles comprise a binder resin and a colorant. The external additive particles comprise at least one member selected from the group consisting of fluorine-containing aluminum hydroxide, fluorine-containing boehmite, and fluorine-containing pseudoboehmite.

Toner, toner accommodating container, developer, developing device, process cartridge, image forming apparatus, and image forming method

To provide a toner, containing: a binder resin; a colorant; a releasing agent; and a crystalline polyester resin, wherein the toner satisfies the following formulae (1) to (3): 40&#xb0; C.&#x2266;X&#x2266;55&#xb0; C. Formula (1) 85&#xb0; C.&#x2266;Y&#x2266;92&#xb0; C. Formula (2) 35&#xb0; C.&#x2266;Y&#x2212;X&#x2266;50&#xb0; C. Formula (3) where X is an onset temperature and Y is an endset temperature of an endothermic peak on a differential scanning calorimetry (DSC) curve of the toner as measured by a differential scanning calorimeter (DSC).

Toner and developer

A toner housing container includes a container body housing a toner; a conveying portion conveying the toner from one end of the container body, in a longer direction of the container body, to its other end at which a container opening portion is provided; a pipe receiving port receiving a conveying pipe fixed to a toner conveying device; and an uplifting portion moving the toner toward a toner receiving port of conveying pipe. Such toner has a molecular weight distribution having a peak in a range of 10to 10, and has C/R of from 0.03 to 0.55 between peak height C attributed to crystalline polyester resin and R attributed to non-crystalline resin when measured by FT-IR after stored at 45&#xb0; C. for 12 hours.

Toner housing container and image forming apparatus

A toner, including: a binder resin; and a colorant, wherein the binder resin contains: a crystalline polyester resin (A); a non-crystalline resin (B); and a composite resin (C), where the composite resin (C) contains a condensation polymerization resin unit and an addition polymerization resin unit, wherein the toner contains chloroform insoluble matter in an amount of 1% by mass to 30% by mass, wherein the toner has a molecular weight distribution having a main peak in a range of 1,000 to 10,000 and a half width of 15,000 or less, where the molecular weight distribution is obtained through gel permeation chromatography (GPC) of tetrahydrofuran soluble matter of the toner, and wherein the toner has an endothermic peak in a range of 90&#xb0; C. to 130&#xb0; C. in measurement through differential scanning calorimetry (DSC).

Toner, image forming apparatus, image forming method, and process cartridge

A classifying apparatus including: a rotor with a plurality of annularly disposed blades, which rotates; and a louver with a plurality of blades which are disposed at an outer circumferential portion of the rotor so as to supply from the outer circumferential portion a fluid for dispersing and classifying a powder material, wherein the powder material is supplied to a gap between the rotor and the louver and centrifugally classified into fine powder and coarse powder, and wherein at least one of the following relationships is satisfied: Relationship (1): &#x3b1;&#x2267;50&#xb0; Relationship (2): D/D&#x2267;1.17 where &#x3b1; denotes an angle formed between imaginary lines connecting the center of the rotor with both ends of each blade of the louver, Ddenotes a diameter of the rotor, and Ddenotes an inner diameter of the louver.

Classifying apparatus, classifying method, and method for producing toner

A toner including a crystalline polyester resin (A), an amorphous resin (B), and a composite resin (C) having a condensation polymerization resin unit and an addition polymerization resin unit is provided. A molecular weight distribution of the toner based on THF-soluble contents thereof has a main peak within a molecular weight range from 1,000 to 10,000 and a half bandwidth of the main peak is 15,000 or less. The molecular weight distribution is determined by gel permeation chromatography. The toner includes chloroform-insoluble contents. A ratio C/R of the toner is within a range from 0.03 to 0.55. C and R represent heights of spectrum peaks specific to the crystalline polyester resin (A) and the amorphous resin (B), respectively, determined by a Fourier transform infrared spectroscopic attenuation total reflection method after the toner is stored in a thermostatic chamber at 45&#xb0; C. for 12 hours.

Toner, image forming method, and process cartridge

A toner including base particles each containing a crystalline polyester and a non-crystalline polyester, wherein the toner has a glass transition temperature of 45&#xb0; C. or higher where the glass transition temperature is determined from a DSC curve of the toner obtained in the first elevation of temperature thereof, and wherein the toner has a temperature width of 8&#xb0; C. or lower where the temperature width is a temperature width at &#x2153; the height of an endothermic peak attributed to the crystalline polyester in the DSC curve.

Toner and method for producing the same

To provide a toner, containing: a binder resin; a crystalline polyester resin; a colorant; and wax, wherein the toner has a fluidized powder characteristic value of 35% to 45%, and a BET specific surface area of 2.8 m/g to 4 m/g, and wherein the toner has an intensity ratio P2850/P828 of 0.10 to 0.20, where P2850 is an intensity of a peak at 2850 cmwhich is attributed from the wax and the crystalline polyester resin, and P828 is an intensity of a peak at 828 cmwhich is attributed from the binder resin, as measured by total reflectance infrared spectroscopy.

Toner, production method thereof, developer and image forming method

A toner containing toner particles, each toner particle containing: a releasing agent; a colorant; and a binder resin containing at least a crystalline polyester resin and a non-crystalline polyester resin, wherein in the case where a volume average particle diameter of the toner is defined as Dv, the toner contains a group of the toner particles having 4/5 Dv, and a group of the toner particles having 6/5 Dv, and wherein an endothermic value A of the crystalline polyester resin at a first temperature increase in DSC of the toner, an endothermic value B of the crystalline polyester resin at a first temperature increase in DSC of the group of the toner particle having 4/5 Dv, and an endothermic value C of the crystalline polyester resin at a first temperature increase in DSC of the group of the toner particles having 6/5 Dv satisfy the relation represented by the following formulas:50&#x3c;()&#xd7;100&#x3c;90, and110&#x3c;()&#xd7;100&#x3c;150.

Toner, developer, image forming method and image forming apparatus

A toner containing: a non-crystalline polyester resin; a crystalline polyester resin; a releasing agent; a graft-modified polymer; and a colorant, wherein the graft-modified polymer is a polymer having a glass transition temperature of higher than 40&#xb0; C. but lower than 80&#xb0; C., and obtained by grafting an acrylic resin onto at least one of a hydrocarbon wax and a crystalline polyester resin, and wherein a SP value of the non-crystalline polyester resin is defined as SP1, a SP value of the crystalline polyester resin is defined as SP2, a SP value of the releasing agent is defined as SP3, and a SP value of the graft-modified polymer is defined as SP4, and SP1, SP2, SP3 and SP4 satisfy relations represented by Formulas (1) to (3): 

A method of sealing a liquid container, including filling a liquid into a liquid containing bag including a cylindrical inlet; and sandwiching the cylindrical inlet with a pair of heat-sealing heads upon application of heat such that the cylindrical inlet is sealed with the liquid therein, wherein at least one of the pair of heat-sealing heads comprises a concave edge.

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Shizuoka, Japan

Shinya Hanatani