Electrostatic Image Transfer Patents (Class 430/48)
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Patent number: 7673562Abstract: A structure and method of using a reusable master printing plate is described. In one embodiment, the method uses an electric field to control a series of microvalves. The microvalves control a fluid flow that raises or lowers selected regions on a flexible printing surface to create a desired relief pattern. After creating the relief pattern, the pattern is fixed and used for printing. After completion of printing, the relief pattern is removed from the master printing plate and the printing plate may be reused by applying a new pattern.Type: GrantFiled: December 22, 2006Date of Patent: March 9, 2010Assignee: Palo Alto Research Center IncorporatedInventors: Ashish Pattekar, Eric Peeters, Gregory B. Anderson
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Publication number: 20100021834Abstract: There is disclosed a fuser member comprising a substrate; and an outer layer thereover comprising (a) a polymer and (b) an organometallic species, wherein said polymer and said organometallic species forms an interpenetrating network upon curing; and wherein the outer layer comprises an increased number of uniform organometallic binding sites, as compared to an outer layer devoid of the interpenetrating network. An image forming apparatus comprising the disclosed fuser member is also disclosed. Moreover, a method of forming a polymer system suitable for use in color fusing applications is disclosed.Type: ApplicationFiled: July 22, 2008Publication date: January 28, 2010Applicant: XEROX CORPORATIONInventors: Santokh Badesha, David J. Gervasi
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Publication number: 20090258306Abstract: Image noise is reduced in halftone imaging processes by placing clear toner particles around the colored toner particles. The clear toner particles must be placed around the colored toner particles prior to transferring the developed image from an imaging member to a receiving member or substrate. The clear toner particles force the colored toner particles to remain in their deposited location during transfer. The result is an image with less mottle and graininess.Type: ApplicationFiled: April 11, 2008Publication date: October 15, 2009Applicant: XEROX CORPORATIONInventor: Chu-heng Liu
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Patent number: 7600868Abstract: The present invention provides a recording paper comprising pulp fibers and filler as main components and containing at least a cationic substance and a water-soluble polymer in a surface of the recording paper, wherein conductivity of water is not less than 0.002 S/m as measured at 1 second after immersing a piece of the recording paper with an area of 0.05 m2 in 40 ml of pure water.Type: GrantFiled: December 27, 2004Date of Patent: October 13, 2009Assignee: Fuji Xerox Co., Ltd.Inventors: Chizuru Koga, Kiyoshi Hosoi, Takashi Ogino, Tsukasa Matsuda
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Publication number: 20090214966Abstract: A toner including toner particles; and external additives including a fatty acid metal salt having an average primary particle diameter of from 0.5 to 1.5 ?m; a positively chargeable particulate inorganic material; and a negatively chargeable particulate inorganic material. An image forming apparatus including a photoreceptor bearing an electrostatic image, and a center feed developing device configured to develop the electrostatic image with a developer including the toner to form a toner image, and a transfer device configured to transfer the toner image onto a receiving material preferably fed at a speed of from 500 to 1700 mm/s. An image forming method including forming an electrostatic image, developing the electrostatic image with the center feed developing device using the toner to form a toner image, and transferring the toner image onto a receiving material preferably fed at a speed of from 500 to 1700 mm/s.Type: ApplicationFiled: February 9, 2009Publication date: August 27, 2009Inventor: Hiroyuki KISHIDA
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Publication number: 20090214965Abstract: An electrophotographic toner includes a binder resin, a colorant, and a releasing agent, wherein the electrophotographic toner has a complex viscosity (?) of 4e2 Pa·s to 8e3 Pa·s at a temperature range of 120 to 160° C. and an angular velocity range of 1.6 to 10 rad/s, a rate of change of the complex viscosity of 165 to 185 Pa·s/° C. at 1.6 rad/s, and 70 to 80 Pa·s/° C. at 10 rad/s within the temperature range, a stress relaxation of 1.0 e3 to 4.5 e4 Pa at a relaxation time of 0.05 to 0.3 seconds under a temperature range of 120 to 160° C., and a rate of change of the stress relaxation (?G/?T) of 785 to 1000 Pa/° C. at 0.05 seconds and 190 to 215 Pa/° C. at 0.3 seconds within the temperature range above.Type: ApplicationFiled: September 29, 2008Publication date: August 27, 2009Inventors: Jae-hyeuk Jeong, Duck-hee Lee, Deuck-woo Jang, Jung-ik Choi, Soon-cheol Jeong, Hae-ree Joo
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Publication number: 20090202927Abstract: To provide: a charge control agent having negative chargeability, which contributes to environmental conservation and the like to an increased degree, has high performance (high charge amount, quick rise-up of charge, excellent stability with time, and high environmental stability), and has improved dispersibility; a toner for developing an electrostatic charge image containing the charge control agent; and an image forming method and an image forming apparatus each using the toner for developing an electrostatic charge image. A charge control agent for controlling a charged state of powder, characterized by including one or more units each represented by the following chemical formula (1) in a molecule.Type: ApplicationFiled: June 9, 2005Publication date: August 13, 2009Applicant: Canon Kabushiki KaishaInventors: Tetsuya Yano, Takashi Kenmoku, Tatsuki Fukui, Ako Kusakari, Chieko Mihara
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Publication number: 20090197190Abstract: An object of the present invention is to suppress the adhesion of a carrier to an image bearing member and the generation of a flaw in the surface layer of the image bearing member, and to improve the dot reproducibility of an electrostatic latent image, and soon. The object is achieved by a two-component developer containing a magnetic carrier, which contains resin-containing magnetic particles, in which the packed bulk density ?1 is 0.80 to 2.40 and ?1/?2 (?2 represents true density) is 0.20 to 0.42 of the porous magnetic core particles, and a specific resistance of the porous magnetic core particles, an average breaking strength of the magnetic carrier and a toner surface tension constant in a 45-vol % aqueous solution of methanol measured by a capillary suction time method fall into the specific range, respectively.Type: ApplicationFiled: May 15, 2008Publication date: August 6, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Kunihiko Nakamura, Hiroyuki Fujikawa, Nozomu Komatsu, Yoshinobu Baba, Takayuki Itakura
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Publication number: 20090186287Abstract: Disclosed is an electrophotographic photoreceptor having a protective overcoat layer including a polyol binder; a hole transport material; a curing agent; and a surface-treated tin oxide particle filler. Also disclosed is a process for forming a photoreceptor that includes providing a photoreceptor substrate; applying a charge generating layer; applying a charge transport layer; and applying a protective overcoating layer over the substrate; such that the protective overcoat layer includes a polyol binder; a hole transport material; a curing agent; and a surface-treated tin oxide particle filler. Also included is a method of forming an image, including the disclosed photoreceptor.Type: ApplicationFiled: January 23, 2008Publication date: July 23, 2009Applicant: XEROX CORPORATIONInventors: Kathy L. DE JONG, Yu QI, Vladislav SKOROKHOD, Nan-Xing HU, Johann JUNGINGER, Markus SILVESTRI, John F. YANUS, Kenny-Tuan DINH
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Publication number: 20090162762Abstract: An electrostatic image developing toner includes a binder resin that includes a polyester carbonate resin or a polyester amide resin, the polyester carbonate resin or the polyester amide resin containing a dodecenylsuccinic acid unit in an mount from about 0.5 mol % to about 30 mol % as a monomer unit; and a colorant.Type: ApplicationFiled: September 10, 2008Publication date: June 25, 2009Applicant: FUJI XEROX CO., LTD.Inventors: Hideo MAEHATA, Hirotaka MATSUOKA, Yasuo MATSUMURA
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Publication number: 20090162761Abstract: In accordance with the invention, there are xerographic photoreceptors, image forming apparatus, and methods of forming an image on image. The xerographic photoreceptor can include a substrate and a conductive ground plane having an optical transparency disposed over the substrate, the conductive ground plane including a carbon nanotube layer, such that machine cycling of the xerographic photoreceptor can produce less than approximately a 10% change in the optical transparency of the conductive ground plane after about 100,000 or more machine cycles. The xerographic photoreceptor can also include a photosensitive layer disposed over the conductive ground plane, wherein the photosensitive layer can include a charge generator material and a charge transport material.Type: ApplicationFiled: December 21, 2007Publication date: June 25, 2009Inventors: Kock-Yee Law, John S. Facci, Edward F. Grabowski
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Publication number: 20090155701Abstract: A toner includes a core containing a binder resin, wax, and a colorant, and an external additive layer coating the core, wherein the core is prepared such that it is extruded and extended to have a fiber phase, and is pulverized. The toner has an improved fixing ability to allow an electrostatic image to be fixed at a low temperature while having an excellent durability and an improved storage stability, while exhibiting reduced toner blocking and offset phenomena.Type: ApplicationFiled: August 19, 2008Publication date: June 18, 2009Applicant: Samsung Electronics Co., LtdInventors: In KIM, Ki-won Seok, Kyung-yol Yon
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Publication number: 20090155700Abstract: A toner including a plurality of fine particles includes a core including first latex particles, a wax and a pigment, or a first latex particle-wax complex and a pigment, and a first shell layer including second latex particles and covering at least a portion of the surface of the core, a method of preparing the toner, a method of forming images using the toner, and an image forming device including a toner transferring unit. The toner can have improved fixing and charging properties, preserving properties at a high temperature and high humidity, glossness and anti-offset properties by reducing a domain size of a wax dispersed in the toner and improving dispersibility of the wax.Type: ApplicationFiled: June 27, 2008Publication date: June 18, 2009Applicant: Samsung Electronics Co., Ltd.Inventors: Kyeong Pang, Kyung-yol Yon, Hong-chul Shin
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Publication number: 20090142677Abstract: An image forming method including electrostatic image forming step, developing step, transferring step, fixing step and oil application step for applying an oil to a fixing member, wherein the toner includes a binder resin, a colorant and a wax, and the relationship (A2/A1)×100<200 is satisfied, wherein A1 represents the area of the oil dropped on a pellet of the toner measured 30 seconds after dropping the oil, and A2 represents the area of the dropped oil measured 24 hours after dropping the oil. Alternatively, the relationships (X1?X2)<0.5 atomic percent, X1>1.0 atomic percent, and X2>1.0 atomic percent, are satisfied, wherein X1 and X2 represent amounts of Si atoms of the silicone oil measured by subjecting the toner image to X-ray photoelectron spectroscopy at times 5 minutes and 24 hours, respectively, after fixing the toner image.Type: ApplicationFiled: December 4, 2007Publication date: June 4, 2009Inventors: Yasutada SHITARA, Minoru MASUDA, Yasuaki IWAMOTO, Hyo SHU
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Publication number: 20090142678Abstract: To provide an electrophotographic developer carrier including a carrier core material, and a coat layer containing a binder resin and conductivity-imparted microparticles which are produced by imparting conductivity to inorganic microparticles, the coat layer being formed over the carrier core material, wherein the electrophotographic developer carrier has a static resistivity of 10 [Log (?·cm)] or higher and a dynamic resistivity of 9 [Log (?)] or lower, and is used in an electrophotographic developer together with a negatively chargeable toner having an average circularity of 0.925 to 0.970, and wherein the toner includes a resin, a colorant and an inorganic layered mineral in which at least part of interlayer ions is modified with organic ions, and is granulated by dispersing and/or emulsifying an oil phase and/or a monomer phase containing at least a toner composition and/or a toner composition precursor in an aqueous medium.Type: ApplicationFiled: December 2, 2008Publication date: June 4, 2009Inventors: Shinichiro Yagi, Kousuke Suzuki, Masashi Nagayama
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Publication number: 20090123855Abstract: By using an intaglio plate for holding a pattern formed by a developing agent, a transfer device for transferring patterns developed on the intaglio plate to a transfer object medium, and a baking chamber for eliminating an electrode layer after transfer or heightening resistance thereof, the patterns developed on the intaglio plate are transferred onto the electrode layer disposed at the opposite side of the transfer object medium, and then heated in the baking chamber, whereby the electrode layer is eliminated or heightened in resistance.Type: ApplicationFiled: November 11, 2008Publication date: May 14, 2009Inventors: Mitsunaga SAITO, Yasushi SHINJIYO, Yoshihiro TAJIMA, Koichi ISHII, Masahiro HOSOYA, Ken TAKAHASHI
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Publication number: 20090123854Abstract: An electrophotographic image forming method is disclosed, wherein a cylindrical developing sleeve carrying a developer is brought into contact with a photoreceptor with rotating the developing sleeve in the counter direction to the rotation of the photoreceptor, and a lubricant is supplied to the photoreceptor and the photoreceptor comprises a uppermost surface layer containing a polyarylate having a structure unit represented by the following formula and the toner comprises toner particles exhibiting a glass transition temperature of from 16 to 44° C.Type: ApplicationFiled: November 6, 2008Publication date: May 14, 2009Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Akihiko ITAMI, Eiichi SAKAI, Yoshihiko ETO, Takeo OSHIBA
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Publication number: 20090117477Abstract: To solve a thin image density and sweeping occurring when a toner carrying member having a small diameter is used, provided is an image-forming method including: a charging step; an electrostatic latent image-forming step; a developing step; a transferring step; and a fixing step, in which a magnetic toner to be used in the method has a specific weight average particle diameter (D4); the magnetic toner has a specific intensity of magnetization in a specific magnetic field; and a surface free energy of a surface of the magnetic toner and a surface free energy of a surface of a toner carrying member to be used in the method satisfy specific relationships.Type: ApplicationFiled: October 29, 2008Publication date: May 7, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Michihisa Magome, Tadashi Dojo, Eriko Yanase, Takashi Matsui, Tomohisa Sano, Shuichi Hiroko
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Publication number: 20090117476Abstract: Disclosed is an electrophotographic imaging member that includes a substrate; a charge generating layer; a charge transport layer; and a protective overcoat layer having a polyol binder; a hole transport material; an acid catalyst; a leveling agent; and no melamine formaldehyde curing agent or cross-linking additive. Also disclosed is a process for forming a photoreceptor that includes providing a substrate; applying to it a charge generating layer, charge transport layer; and protective over coating layer having a polyol binder; a hole transport material; an acid catalyst; a leveling agent; and no melamine formaldehyde curing agent or cross-linking additive. Additionally provided is a method of forming an image with the disclosed electrophotographic imaging member.Type: ApplicationFiled: November 7, 2007Publication date: May 7, 2009Applicant: XEROX CORPORATIONInventors: Matthew A. HEUFT, Hany AZIZ, Kathy L. DE JONG, Nan-Xing HU
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Publication number: 20090111038Abstract: An electrophotographic toner includes a latex, a coloring agent, a wax and 3 to 1,000 ppm of each of Si and Fe, wherein a mole ratio of Si to Fe is from 0.1 to 5.Type: ApplicationFiled: May 13, 2008Publication date: April 30, 2009Applicant: Samsung Electronics Co., LtdInventors: Yoda SHIN, Kyung-yol Yon, Tac-hoe Koo
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Publication number: 20090061333Abstract: A carrier for developing an electrostatic latent image includes carrier particles, and the carrier particles include magnetic particles and a coating layer coating the surfaces of the magnetic particles. The BET specific surface area of the magnetic particles is 0.1300 m2/g to 0.2500 m2/g, and the difference in BET specific surface areas obtained by subtracting the BET specific surface area of the magnetic particles from the BET specific surface area of the carrier particles is 0.0300 m2/g to 0.400 m2/g.Type: ApplicationFiled: March 27, 2008Publication date: March 5, 2009Applicant: FUJI XEROX CO., LTD.Inventors: Akira MATSUMOTO, Taichi YAMADA, Yosuke TSURUMI, Fusako KIYONO, Akihiro IIZUKA, Fumiaki MERA, Hirotaka MATSUOKA
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Publication number: 20090061334Abstract: A toner and a method of preparing the toner, the method including: preparing first latex particles by polymerizing a toner composition including a macromonomer having a hydrophilic group, a hydrophobic group, and at least one reactive functional group; at least one polymerizable monomer; and a wax; preparing a first agglomerated toner by mixing the first latex particles with a pigment dispersion dispersed by the macromonomer and adding an inorganic salt to the mixture; and coating second latex particles which are prepared by polymerizing a composition for the second latex particles including at least one polymerizable monomer and a cross-linkable monomer on the first agglomerated toner, a method of forming an image using the toner, and an image forming apparatus employing the toner.Type: ApplicationFiled: August 18, 2008Publication date: March 5, 2009Inventors: Yo-da Shin, Kyung-yol Yon, Min-young Cheong, Tae-hoe Koo
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Publication number: 20090053630Abstract: A method of preparing toner, the method including: preparing latex particles for a core which contain wax by polymerizing a toner composition comprising at least one polymerizable monomer and a macromonomer having a hydrophilic group, a hydrophobic group, and at least one reactive functional group; mixing the latex particles for a core with a self-dispersable pigment dispersion and adding an inorganic salt thereto to prepare a primarily agglomerated toner; and coating latex particles for a shell layer on the primarily agglomerated toner. In addition, a toner prepared using the preparation method, a method of forming image using the toner, and an image forming apparatus using the toner. Accordingly, pigments can be uniformly dispersed even without using an emulsifying agent and a dispersant, and thus images that are uniformly transferred can be obtained, and toner with long-term storage and excellent durability can be prepared.Type: ApplicationFiled: March 19, 2008Publication date: February 26, 2009Applicant: Samsung Electronics Co., LtdInventors: Jun-young LEE, Kyung-yol Yon, Min-young Cheong, Yo-da Shin, Tae-hoe Koo
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Publication number: 20090053631Abstract: An image forming method includes forming an electrostatic latent image on a surface of a latent image carrier; developing the electrostatic latent image with a developing agent including a toner to form a toner image; transferring the toner image onto a surface of a target to obtain a transferred toner image; and fixing the transferred toner image; wherein the toner includes a resin particle having a core-shell structure, both of a resin constituting the core and a resin constituting the shell are a non-crystalline resin, glass transition temperatures of the resin constituting the core and the resin constituting the shell are different by about 20° C. or greater, the resin constituting the shell includes an acidic polar group, a basic polar group, or an alcoholic hydroxy group, and the fixing of the transferred toner image is performed by applying a pressure on the transferred toner image without heating.Type: ApplicationFiled: March 12, 2008Publication date: February 26, 2009Applicant: FUJI XEROX CO., LTD.Inventor: Yasuo Matsumura
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Publication number: 20090053632Abstract: A pattern forming apparatus includes a depressed plate holding patterns by developers, a charging device for charging the depressed plate, a developing device for developing a red pattern, a developing device for developing a green pattern, a developing device for developing a blue pattern, and a stage for holding the charging device and the developing devices and moving them relative to the depressed plate. The charging device, the red developing device, the green developing device and the blue developing device pass along the depressed plate sequentially to perform the charging process, the red developing process, the green developing process and the blue developing process simultaneously.Type: ApplicationFiled: September 2, 2008Publication date: February 26, 2009Inventors: Koichi Ishii, Masahiro Hosoya
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Publication number: 20090029273Abstract: Briefly described, embodiments of this disclosure include ink composition for use in electrostatic imaging, method of making an ink formulation for use in electrostatic imaging, and the like.Type: ApplicationFiled: July 26, 2007Publication date: January 29, 2009Inventors: Stella Stolin Roditi, Albert Teishev
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Publication number: 20090011347Abstract: The invention provides an electrophotographic toner having a crystalline polyester resin; a non-crystalline polyester resin; a colorant; and a releasing agent. A resin (i), that is included in a toluene-soluble component of the toner and having a molecular weight of 30,000 to 100,000 as measured by gel permeation chromatography relative to polystyrene standards, has an acid value A. A resin (ii), that is included in a toluene-soluble component of the toner and having a molecular weight of 8,000 to 12,000 as measured by gel permeation chromatography relative to polystyrene standards, has an acid value B. A resin (iii), that is included in a toluene-insoluble component of the toner, has an acid value C. The acid values A, B, and C satisfy the inequation of B>A>C. The invention further provides an electrophotographic developer using the toner, a toner cartridge storing the toner, and an image forming method using the developer.Type: ApplicationFiled: March 12, 2008Publication date: January 8, 2009Applicant: FUJI XEROX CO., LTD.Inventors: Katsumi DAIMON, Yutaka SUGIZAKI, Susumu YOSHINO, Hiroshi NAKAZAWA
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Publication number: 20090004582Abstract: An electrophotographic toner is provided including parent toner particles having a small average particle diameter and external additives applied to the surface of the parent toner particles. The external additives include: a large particulate silica; a small particulate silica; a conductive titanium oxide; strontium titanate; and an aluminum oxide. High-quality and high-speed imaging can be performed using the toner since the amount of toner charge can be stably maintained for both initial and long-term use.Type: ApplicationFiled: January 2, 2008Publication date: January 1, 2009Inventor: Sang-woo Kim
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Publication number: 20080318142Abstract: A photoreceptor including an electroconductive substrate; a photosensitive layer, which is located overlying the electroconductive substrate and which includes a charge generation material, a charge transport material having no radical polymerizability, a binder resin having no radical polymerizability, and a crosslinked polymer including a unit obtained from a first radically polymerizable monomer having three or more functional groups and no charge transport structure and a unit obtained from a second radically polymerizable monomer having a charge transport structure; and an outermost layer, which is located on the photosensitive layer and which includes a crosslinked polymer including a unit obtained from a third radically polymerizable monomer having three or more functional groups and no charge transport structure and a unit obtained from a fourth radically polymerizable monomer having a charge transport structure. An image forming method and apparatus, and a process cartridge using the photoreceptor.Type: ApplicationFiled: May 28, 2008Publication date: December 25, 2008Applicant: RICOH COMPANY, LTD.Inventors: Yoshiaki KAWASAKI, Akihiro Sugino, Mitsuaki Hirose
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Publication number: 20080318141Abstract: A method of preparing toner, the method including preparing a latex for a core by polymerizing a composition for a core including a macromonomer having a hydrophilic group, a hydrophobic group and at least one reactive functional group, at least one polymerizable monomer, and a wax; agglomerating the latex for a core by adding a pigment dispersion dispersed by the macromonomer and an inorganic salt to the prepared latex for a core; and coating the agglomerated latex for a core using a latex for a shell layer, wherein the latex for a shell layer is prepared by polymerizing a composition for a shell layer including at least one polymerizable monomer, a macroinitiator having polydimethyl siloxane units, and a macromonomer, and toner prepared according to the method.Type: ApplicationFiled: January 23, 2008Publication date: December 25, 2008Applicant: Samsung Electronics Co., Ltd.Inventors: Yo-da SHIN, Kyung-yol YON, Kyeong PANG, Tae-hoe KOO
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Publication number: 20080318144Abstract: To provide a toner including: a toner material that contains at least a binder resin, a pigment, and a pigment dispersant, wherein the pigment dispersant has an acid value of 20 mgKOH/g to 50 mgKOH/g and an amine value of 1 mgKOH/g to 50 mgKOH/g, and wherein the pigment contains at least aluminum phthalocyanine.Type: ApplicationFiled: June 20, 2008Publication date: December 25, 2008Inventors: Naohiro Watanabe, Shinichi Wakamatsu, Hiroshi Yamashita, Tsuyoshi Sugimoto
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Publication number: 20080318145Abstract: A toner having at least one binder, at least one colorant and external additives. The external additives include at least one fluoropolymer. An electrophotographic image forming machine and method includes the toner with at least one fluoropolymer.Type: ApplicationFiled: September 2, 2008Publication date: December 25, 2008Applicant: XEROX CORPORATIONInventors: Nan-Xing HU, Cuong VONG, John F. GRAHAM, Richard P.N. VEREGIN
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Publication number: 20080318143Abstract: An image forming apparatus including a charging unit, an exposing unit, a developing unit, a transferring unit, and a fixing unit. A toner containing a colorant and a binder resin which contains a polyester resin (A) and a polyester resin (B) having a softening point 10° C. or more higher than that of the polyester resin (A); the polyester resin (A) is a (meth)acrylic acid-modified rosin derived resin having a polyester unit obtained by polycondensation of an alcohol component, which contains 65 mol % or more of 1,2-propanediol in a dihydric alcohol component, and a carboxylic acid component containing a (meth)acrylic acid-modified rosin; the polyester resin (B) is a purified rosin derived resin having a polyester unit obtained by polycondenstation of an alcohol component, which contains a total of 70 mol % or more of 1,2-propanediol and 1,3-propanediol in a dihydric alcohol component, and a carboxylic acid component containing purified rosin.Type: ApplicationFiled: June 19, 2008Publication date: December 25, 2008Inventors: Shinya Nakayama, Akihiro Kotsugai, Akiyoshi Sabu
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Publication number: 20080299471Abstract: A carrier of the present invention is used in a developer including a toner which includes at least a binder resin and an organic colorant, and the carrier has a core and a coating formed on the surface of the core, the coating including (i) a charge control agent for controlling a charge whose polarity is the same as a polarity of a charge controlled by a charge control agent included in the toner, and (ii) a conductive particles. The use of the carrier of the present invention enables: prevention of decrease in the charging amount of the toner which includes at least a binder resin and an organic colorant; and formation of a stable, high-resolution, high-quality image which has very few image defects such as a photographic fog.Type: ApplicationFiled: May 28, 2008Publication date: December 4, 2008Inventors: Takanori Kamoto, Tadashi Iwamatsu, Nobuyuki Yoshioka, Yoshinori Mutoh, Hiroyuki Hirakawa, Takashi Hara
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Publication number: 20080286668Abstract: An object of the present invention is to provide a two-component developer which can achieve a high-definition image with a smaller toner laid-on level than a conventional one, provides a color gamut comparable to that of printing, can respond to an increase in printing speed, and allows an image with a stable tinge to be formed even in long-term use. The object can be achieved by a two-component developer containing a cyan toner and a magnetic carrier, the two-component developer being characterized in that the cyan toner has the following characteristics: (i) when the concentration of the cyan toner in a solution of the cyan toner in chloroform is represented by Cc (mg/ml) and the absorbance of the solution at a wavelength of 712 nm is represented by A712, a relationship between Cc and A712 satisfies the relationship of 2.00<A712/Cc<8.15; (ii) the lightness L* and chroma C* of the cyan toner determined in a powder state satisfy the relationships of 25.0?L*?40.0 and 50.0?C*?60.Type: ApplicationFiled: July 29, 2008Publication date: November 20, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Koh Ishigami, Kazuo Terauchi, Noriyoshi Umeda, Tetsuya Ida, Naoki Okamoto, Yojiro Hotta, Yoshinobu Baba, Takayuki Itakura, Takeshi Yamamoto, Manami Haraguchi, Kenta Kubo
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Publication number: 20080286008Abstract: A titanylphthalocyanine crystal having an X-ray diffraction spectrum having plural diffraction peaks and a primary particle diameter not greater than 0.2 ?m, wherein a maximum diffraction peak is observed at a Bragg (2 ?) angle of 27.2±0.2°; main peaks are observed at 9.4°, 9.6° and 24.0°; and a minimum diffraction peak is observed at 7.3°; and preferably no diffraction peak is observed at an angle greater than 7.3° and less than 9.4° when a specific X-ray of CuK? having a wavelength of 1.542 ? irradiates the titanylphthalocyanine crystal.Type: ApplicationFiled: July 16, 2008Publication date: November 20, 2008Inventor: Tatsuya NIIMI
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Publication number: 20080280218Abstract: To provide a toner produced by emulsifying or dispersing in an aqueous medium particles containing at least polyester resin particles and by aggregating the polyester resin particles, wherein the polyester resin particles contain a polyester resin, the polyester resin is produced by condensation polymerization of an alcohol component containing 65 mol % or more 1,2-propanediol in a dihydroxy alcohol component and a carboxylic acid component containing purified rosin, and the softening point of the polyester resin is 80° C. or more and less than 120° C., and wherein the toner comprises a colorant and a releasing agent.Type: ApplicationFiled: April 30, 2008Publication date: November 13, 2008Inventors: Akiyoshi Sabu, Akihiro Kotsugai, Shinya Nakayama, Hiroshi Yamashita, Tsuyoshi Sugimoto, Hiroshi Yamada, Junichi Awamura
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Publication number: 20080280219Abstract: The present invention provides a toner containing at least a binder resin, a releasing agent, and a colorant, wherein the binder resin contains at least a polyester resin (A) having a softening point Tm(A) of 120° C. to 160° C., a polyester resin (B) having a softening point Tm(B) of 80° C. or more and less than 120° C. and a composite resin (C) containing a condensation polymerization monomer and an addition polymerization monomer, at least any one of the polyester resins (A) and (B) is a polyester resin prepared by condensation-polymerizing an alcohol component substantially composed of only aliphatic alcohol with a carboxylic acid component, and 65% or more of the alcohol component is 1,2-propanediol.Type: ApplicationFiled: May 9, 2008Publication date: November 13, 2008Inventors: Shinya Nakayama, Akihiro Kotsugai, Akiyoshi Sabu, Hiroshi Yamashita, Hiroshi Yamada, Junichi Awamura, Tsuyoshi Sugimoto
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Publication number: 20080261134Abstract: A developing apparatus, a developing method and an image forming apparatus are provided in which reduction in the quantity of development is prevented in the case where a micro particle diameter toner is used. The developing apparatus uses a developer containing a toner and supplies the toner to an image carrier. The developing apparatus includes: a developer housing unit configured to house the developer; a developer carrier in which at least one of magnets provided therein is formed by an electromagnet, and which carries the developer from the developer housing unit toward the image carrier; a developer carrying regulating unit configured to regulate the developer carried by the developer carrier; and an electromagnet driving unit configured to vary a voltage to be applied to the electromagnet.Type: ApplicationFiled: April 17, 2008Publication date: October 23, 2008Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventor: Mitsutoshi Watanabe
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Publication number: 20080261131Abstract: A toner that is excellent in low-temperature fixing property, offset resistance, storage stability, charge rising property, charge stability with time and pulverizability and allows for forming high-quality images over a long period of time. The toner contains at least a binder resin, a colorant and a charge controlling agent, wherein the charge controlling agent contains an aromatic oxycarboxylic acid metal compound having a trivalent or more central metal, the binder resin comprises a polyester resin (A) having a softening point Tm (A) of 120° C. to 160° C. and a polyester resin (B) having a softening point Tm (B) of 80° C. to less than 120° C., and at least any one of the polyester resins (A) and (B) contains 1,2-propane diol at 65 mol % or more in a divalent alcohol component and can be obtained by condensation polymerizing an alcohol component substantially composed of only an aliphatic alcohol with a carboxylic acid component.Type: ApplicationFiled: November 21, 2007Publication date: October 23, 2008Inventors: Shinya NAKAYAMA, Akihiro KOTSUGAI, Yasuaki IWAMOTO, Yasutada SHITARA
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Publication number: 20080261132Abstract: A resin for an electrostatic-image-developing toner includes a polyester resin; a vinyl polymer resin obtained by polymerization of a radically polymerizable vinyl monomer; and at least one of a nitroxide compound and a reaction product of a nitroxide compound and an acid.Type: ApplicationFiled: February 26, 2008Publication date: October 23, 2008Applicant: FUJI XEROX CO., LTD.Inventors: Hideo Maehata, Hirotaka Matsuoka, Yasuo Matsumura
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Publication number: 20080261133Abstract: A resin for an electrostatic-image-developing toner includes a graft polymer, wherein the graft polymer has a polyester structure in the main chain thereof; the graft polymer includes monomer units derived from vinyl monomers in the side chains thereof; and at least a part of the monomer units have a residue of surfactant.Type: ApplicationFiled: March 3, 2008Publication date: October 23, 2008Applicant: FUJI XEROX CO., LTD.Inventors: Hideo MAEHATA, Hirotaka MATSUOKA, Fumiaki MERA
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Publication number: 20080254378Abstract: The object of the present invention is to provide a toner characterized in that the toner comprises a first binder resin and a second binder resin, the first binder resin is an amorphous resin and the second binder resin is a crystalline resin, and the glass-transition temperature of the toner (TgA) is lower than the glass-transition temperature expressed by the following equation (1) (TgC). TgC = ? i = 1 n ? ? b i / ? i = 1 n ? ? ( b i TgB i ) Equation ? ? ( 1 ) In the above equation (1), “TgBi” represents the glass-transition temperature of the amorphous resin, “n” represents the number of amorphous resins, and “b” represents the content of the amorphous resin (part by mass). Examples of the preferred aspect of the present invention includes the one that at least a part of the amorphous resin and a part of the crystalline resin are compatible each other, and the one that the glass-transition temperature of the toner (TgA) is 10° C.Type: ApplicationFiled: June 17, 2008Publication date: October 16, 2008Inventors: Keiko Matsumoto, Toyoshi Sawada
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Publication number: 20080247785Abstract: A pattern forming apparatus brings a masking panel having a pattern-like through hole into tight contact with the inside surface of a front panel, and positions the through hole to the inside of a recess of the front panel. In this state, liquid developer is supplied through a developing roller, and an electric field passing through a developing recess where the recess and through hole are continued. Therefore, charged developer particles are collected in the developing recess, and the recess of the front panel is developed.Type: ApplicationFiled: March 26, 2008Publication date: October 9, 2008Inventors: Nobuo Kawamura, Makoto Onodera, Sachiko Hirahara, Toshio Ioi, Koichi Ishii
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Publication number: 20080248413Abstract: On the surface of a core particle of a toner particle, a silane coupling agent treatment layer, a coating layer of thermoplastic resin microparticles applied to the core particle and a charge control agent added to the coating layer through the silane coupling agent treatment layer are provided, wherein the toner particle has a particle diameter of 1 to 10 ?m, or on the surface of a core particle of a toner particle, a coating layer of thermoplastic resin microparticles and a charge control agent added to the coating layer and made of an organic compound containing at least one type of lanthanoid metal are provided, or on a ZnS type fluorescent body core particle, a coating layer of thermoplastic resin microparticles and a charge control agent added to the coating layer and including a metal compound containing the IIA metal or IIIA group metal are provided.Type: ApplicationFiled: March 25, 2008Publication date: October 9, 2008Inventors: Keita Ishii, Yasushi Shinjo, Hirofumi Takemura, Katsuyuki Aoki
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Publication number: 20080241718Abstract: A method and device for receiving a used web of transfer foil on a wind-up reel overcome the disadvantage of telescoping of the wound-up web of transfer foil on the wind-up reel, which tends to increase as a used web of transfer foil continues to be fed to the wind-up reel. Telescoping is at least reduced by providing a device for receiving a used web of transfer foil with at least one dielectric layer, causing web regions adjacent each other in the radial direction on the wind-up reel to adhere to each other due to electrostatic forces. At least one charging device for charging the dielectric layer of the web of transfer foil is provided in a transfer foil web region upstream of the wind-up reel, to charge the used web of transfer foil. The charging device substantially extends over the entire width of the web of transfer foil.Type: ApplicationFiled: March 27, 2008Publication date: October 2, 2008Applicant: HEIDELBERGER DRUCKMASCHINEN AGInventor: Alexander Weber
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Publication number: 20080241719Abstract: A process for forming a full-color image, wherein the 4 color toners each have an apparent viscosity at 105° C. of 50,000 to 300,000 Pa·s and an apparent viscosity at 130° C. of 3,000 to 30,000 Pa·s, and as a color toner arranged at the outermost layer on a transfer medium among the 4 color toners, a toner, in which a maximum peak or a shoulder peak is present between 105° C. and 130° C. in a temperature-logarithmic melt viscosity graph, is used, and as the other color toners arranged at lower layers than the outermost layer, toners, in which neither the maximum peak nor the shoulder peak is present between 105° C. and 130° C., are used.Type: ApplicationFiled: March 31, 2008Publication date: October 2, 2008Applicant: ZEON CORPORATIONInventor: Kazu Niwa
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Publication number: 20080241716Abstract: An image forming apparatus including an image bearing member, a charging device, an irradiating device, a developing device, a transfer device, a fixing device, and a cleaning device, wherein the image bearing member includes a substrate on which a photosensitive layer and a cross-linked surface layer are accumulated and the cross-linked surface layer comprises a cross-linked material formed by curing a monomer having at least three radical polymerizable function groups without a charge transport structure and a radical polymerizable compound having a charge transport structure by a photo-energy irradiation device, wherein the toner has a volume average particle diameter of from 1 to 5 ?m and an average circularity of from 0.95 to 0.Type: ApplicationFiled: November 21, 2007Publication date: October 2, 2008Inventors: Masahiko Ishikawa, Masami Tomita, Yoshiaki Kawasaki
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Publication number: 20080240759Abstract: A developer device applies bias voltage including an alternating-current component equal to or larger than a value corresponding to a developing electric field of 9 V/?m to a developing roller. The bias voltage is set to apply developer to a latent image on a photosensitive element to develop the image in an image forming mode. The bias voltage is set so that a difference between an area central potential and a surface potential of the photosensitive element is shifted to a direction attracting the normally charged developer to a developer carrier, in relation to a difference between an area central potential and a surface potential of the image carrier in the latent image section in the image forming mode, and a supply amount of the developer to the photosensitive element is smaller than that in the latent image section in the image forming mode.Type: ApplicationFiled: February 15, 2008Publication date: October 2, 2008Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventor: Ryouji Kouno
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Publication number: 20080241717Abstract: A toner for electrostatic image development, containing a resin binder and a wax, wherein the resin binder contains an amorphous polyester obtained by polycondensing a carboxylic acid component containing fumaric acid in an amount of from 55 to 100% by mole, with an alcohol component, wherein the wax contains an ester of pentaerythritol and a fatty acid having 15 to 25 carbon atoms, and a method of forming fixed images, including the step of applying the toner for electrostatic image development to a non-contact fixing type image-forming apparatus. The toner for electrostatic image development of the present invention is suitably used for, for example, developing a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: ApplicationFiled: March 24, 2008Publication date: October 2, 2008Applicant: KAO CORPORATIONInventors: Satoshi KUNII, Masahito Yamazaki