Ricoh Company, Ltd.

Minolta Company, Ltd.

Konica Minolta Business Technologies, Inc.

Masahide Inoue

Yoshihiro Mikuriya

Masayuki Hagi

Hideaki Yasunaga

Katsunori Kurose

Takuya Kadota

Atsushi Yamamoto

Hiroaki Katoh

Minoru Nakamura

Kazuoki Fuwa

Yoshimichi Ishikawa

Yoshitaka Sekiguchi

Hiroaki Kato

Masahiro Anno

Tsuyoshi Nozaki

Chiyoshi Nozaki

Hiroyuki Murakami

Chikara Tsutsui

Mitsuyo Matsumoto

Yoshiyuki Shimizu

Satoshi Ogawa

Megumi Aoki

Hiroyuki Kishida

Yasutada Shitara

Takeshi Arai

Hyo Shu

Masayasu Hagi

Yoahihiro Mikuriya

An image forming method including forming an electrostatic latent image on a photoreceptor; developing the latent image with a developer including a toner using a center-feed developing device to form a toner image; transferring the toner image onto a receiving material; and fixing the toner image using a fixing member coated with silicone oil. The toner includes at least a binder resin; a colorant; and a quaternary ammonium salt having a specific formula, wherein when the toner is dispersed in ethanol using ultrasonic waves, the dispersion has a turbidity of from 0.4 to 1.0 when the turbidity is determined using a haze meter. An image forming apparatus including a photoreceptor; a center-feed developing device using a developer including the toner; a transferring device; a fixing device using a fixing member coated with silicone oil; and a cleaner for the photoreceptor.

Image forming method and image forming apparatus

A non-magnetic toner, including a binder resin; a wax present dispersing in the toner in the shape of a particle; and a colorant, wherein the wax having a particle diameter not less than 2.0 &#x3bc;m and less than 3.0 &#x3bc;m is not less than 20% and less than 40% by number based on total number thereof; the wax has a mode value not less than 1.5 &#x3bc;m and less than 2.0 &#x3bc;m in a frequency distribution of 0.1 &#x3bc;m width; and the following relationship is satisfied:45&#x3c;&#x3c;62wherein X represents a softening point (&#xb0; C.) of the toner; Y represents a volume-average particle diameter (&#x3bc;m) of the toner; and Z represents a total parts by weight of the wax included in 100 parts by weight of the toner.

Toner for non-magnetic one-component developer, method of preparing the toner, developer and image forming method

An image forming apparatus, wherein a surface resistivity Rse[&#x3a9;] of a charger and a volume resistivity Rsw [&#x3a9;&#xb7;cm] of the composition having a low softening point satisfy the following relationship:0.8&#xd7;101.5&#xd7;10is provided. The image forming apparatus contains a photoreceptor; a charger configured to charge the photoreceptor with a charger contacting thereto; an irradiator configured to irradiate the photoreceptor to form an electrostatic latent image thereon; an image developer configured to develop the electrostatic latent image with a toner to form a toner image on the photoreceptor; a transferer configured to transfer the toner image onto a recording material directly or through an intermediate transferer; and a fixer configured to fix the toner image on the recording material, wherein the toner comprises: a binder resin; a colorant; a composition having a low softening point; and an external additive.

Image forming method and apparatus

To provide a toner that contains at least a binder resin, a colorant, a releasing agent and zeolite, the toner being manufactured through O/W type wet granulation and having an average circularity of 0.970 or greater, and a developer and image forming method using the toner.

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

A developing device including a developing roller facing an image bearing member and a toner layer thickness control member to control an amount of a toner adhered to the developing roller, so that an electrostatic latent image formed on the image bearing member is developed with the toner to form a toner image. The following relationships are satisfied: 0.08&#xd7;10&#xd7;Dv&#x3c;Ra&#x3c;0.18&#xd7;10&#xd7;Dv, 2.0&#x3c;(Ra/RSm)&#xd7;100&#x3c;4.0, and 8&#x3c;Rz&#x3c;15, where Dv (&#x3bc;m) is a volume average particle diameter of the toner, Ra (&#x3bc;m) is an arithmetical mean roughness of the developing roller in a longitudinal direction, Rz (&#x3bc;m) is a ten-point mean roughness of the developing roller in a longitudinal direction, and RSm (&#x3bc;m) is a mean length of roughness curve elements of the developing roller.

Developing device, and image forming method and process cartridge using the developing device

A toner for electrostatic charge development is provided where the toner comprises a colorant and a resin and contains an organic boron compound represented by a following chemical formula (A) as a charge controlling agent, further the toner is treated with an inorganic fine particle and at least one of the inorganic particles is a magnesium silicate compound represented by a following general formula [2] is provided. 

Toner and image forming method

An image developer using a one-component developer, Including a developing roller visualizing an electrostatic latent image formed on an image bearer with a pulverized toner; and a feed roller feeding the pulverized toner to the developing roller while contacting thereto, wherein the pulverized toner includes a parent toner; a wax; and an external additive comprising an additive having a number-average particle diameter of from 20 to 60 nm and adhering to the surface of the parent toner at an adherence strength of from 50 to 70%, and wherein the following relationships (1) to (3) are satisfied:4.70&#x3c;LogR&#x3c;5.70&#x2003;&#x2003;(1)8.00&#x3c;LogZ&#x3c;10.70&#x2003;&#x2003;(2)&#x2212;6.25*Log+37.5&#x3c;Log&#x3c;&#x2212;6.25*Log+45.6&#x2003;&#x2003;(3)wherein R represents a resistivity of the developing roller and Z represents an impedance of the pulverized toner.

Image developer using one-component developer

A toner useful for an oilless fixing method, includes a binder resin; a colorant; and 2.0 to 4.5% by weight of a wax which is soluble in n-hexane, based on a total weight of the toner, wherein the wax is dispersed in the toner, the wax forming wax domain particles (DA) comprising wax domain particles (DS) exposed at a surface of the toner and wax domain particles (DI) encapsulated in the toner and not exposed at the surface of the toner, wherein a weight of the DS is greater than a weight of the DI, wherein the toner from which the DS have been eluted with n-hexane comprises vestigial concavities having an area of 0.01 &#x3c0;&#x3bc;mor more on the surface of the toner in an amount of from 1 to 7 pcs/4 &#x3bc;m, and wherein 60% or more by number of the DA having a particle diameter of 200 nm or more have a spindle or cylindrical shape having an aspect ratio of 4 or more.

Toner, and oilless fixing method and process cartridge using the toner

A toner including toner particles including a resin, a colorant, a wax, and a charge controlling agent, and an external additive, wherein the toner satisfies the relationships (1) 0.15&#xd7;Q&#x2212;2&#x2266;T&#x2266;0.15&#xd7;Q&#x2212;0.15, and (2) 1.0&#x2266;T&#x2266;2.5, wherein Q represents the charge of the toner in units of &#x3bc;C/g, and T represents the torque of the toner in units of mN&#xb7;m determined by a method using a cone-shaped rotor while controlling a space ratio of the toner at 58%. A developer including the toner and a carrier. An image forming apparatus including an image bearing member, a transfer device, a fixing device and a double side image forming unit, and using the toner, wherein the receiving material includes moisture in an amount of not greater than 5% by weight after the toner image on the first side is fixed.

Toner, developer including the toner, and image forming method and apparatus using the toner

A developing device including a developer bearing member configured to feed a developer to an image bearing member; a developer supplying member, which is contacted with the developer bearing member at a first nip while opposed thereto and which is configured to supply the developer to the developer bearing member; and a developer layer forming member, which is contacted with the developer bearing member at a second nip located on the downstream side from the first nip relative to the rotation direction of the developer bearing member to form the layer of the developer on the developer bearing member, wherein the developer is a nonmagnetic one component developer, and the distance between the front edge of the second nip and the rear edge of the first nip relative to the rotation direction of the image bearing member is greater than 0.8 mm and less than 2.0 mm.

Developing device, developer therefor, and image forming method and apparatus, and process cartridge using the developing device

An image forming method, including charging a photoreceptor with a charger contacting thereto; irradiating the photoreceptor to form an electrostatic latent image thereon; developing the electrostatic latent image with a toner to form a toner image on the photoreceptor; transferring the toner image onto a recording material directly or through an intermediate transferer; and fixing the toner image on the recording material, wherein the toner includes a binder resin; a colorant; a composition having a low softening point; and an external additive, and wherein a surface resistivity Rse [&#x3a9;] of the charger and a volume resistivity Rsw [&#x3a9;&#xb7;cm] of the composition having a low softening point satisfy the following relationship:0.8&#xd7;10&#x3c;1.5&#xd7;10

A toner including toner particles including a binder resin, a colorant and a release agent, and an external additive including a first particulate inorganic material having a formula of MgSiOwhere each of x and y is an integer, and a number average secondary particle diameter of from 0.02 &#x3bc;m to 2 &#x3bc;m, wherein the first atomic ratio (Mg/Si)s in a surface portion of the first particulate inorganic material is not greater than (preferably less than) the second atomic ratio (Mg/Si)e in the entire first particulate inorganic material. Alternatively, a toner including toner particles including a binder resin and a colorant, and an external additive which includes a particulate inorganic material having a formula of MgSiOwhere each of x and y is an integer and which has a surface treated with a fatty acid.

Toner and image forming method using the toner

A toner kit containing at least a black toner, a yellow toner, a magenta toner and a cyan toner, wherein these toners have at least the binder resin, the colorant and the charge controlling agent having the molecular structure containing K+ as the counterion, when the K+ intensity detected by the fluorescent X ray on the surface of the black toner is Kk, the K+ intensity detected by the fluorescent X ray on the surface of the yellow toner is Ky, the K+ intensity detected by the fluorescent X ray on the surface of the magenta toner is Km and the K+ intensity detected by the fluorescent X ray on the surface of the cyan toner is Kc, the following formulae: Kk&#x3c;Ky, Kk&#x3c;Km and Kk&#x3c;Kc are fulfilled is provided.

Toner and method for producing the same, toner kit, and developer, process cartridge, image forming method and image forming apparatus

To provide a toner recovery apparatus including: a toner transporting duct; and an endless toner transporting belt; wherein the toner transporting belt is rotated in a loop form in such a way that it descends in a region where the outer circumferential surface faces a ceiling surface of the toner transporting duct and that it rises in a region where the outer circumferential surface of the toner transporting belt faces a bottom surface of the toner transporting duct, the toner recovery apparatus transports the residual toner to the outlet by holding the toner by the convex parts, spaces formed between convex parts and the bottom surface of the toner transporting duct, and the toner comprises a binding resin, releasing agent, coloring material and external additive, and torque T (mNm) measured by torque measurement method using a conical rotor in a space ratio of 50% to 60% is 1.0 to 2.5.

Toner recovery apparatus, process cartridge, and image forming apparatus

The present invention provides a developing device that allows for maintaining the conveyance amount of a toner within a certain definite range. A developing deviceof the present invention is provided with a toner conveying unitconfigured to convey a first toner and a controlling memberconfigured to control the thickness of a toner layer formed with the first toner conveyed by the toner conveying unit, wherein a second toner provided with a charged amount per unit mass that differs from a charged amount per unit mass of the first toner is applied over the surface of the controlling member

Growing community of inventors

Numazu, Japan

Masahide Inoue