Metal Oxide Conmpound Adjuvant (e.g., Ai2o3'tio2'etc.) Patents (Class 430/108.6)
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Patent number: 7371495Abstract: A toner is formed of toner particles including a polyester resin as a principal component, and at least a colorant and a charge control agent, and externally added inorganic fine particles and organic fine particles. The toner has a volume-average diameter of 4 to 10 ?m, contains the charge control agent at 0.1 to 1.5%, and has an acid value of 2 to 33 mgKOH/g. The charge control agent exhibits a number-basis isolation percentage of at most 10% with respect to the toner particle. The charge control agent, the inorganic fine particles and organic fine particles exhibit number-basis isolation percentages from the toner particles satisfying a following relationship: 30%>inorganic fine particles>organic fine particles>charge control agent>0%.Type: GrantFiled: March 15, 2005Date of Patent: May 13, 2008Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventor: Shuitsu Sato
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Publication number: 20080096116Abstract: The object of the invention is to provide a toner enabling excellent transferring properties, cleanability, and fixability and forming a high-precision image without substantially degraded image quality even after printed on a number of sheets of paper. The invention also provides the toner-production method, an image forming apparatus, an image forming method, and a process cartridge. To this end, the present invention provides a toner which comprises toner-base particles containing a binder resin and a filler, and inorganic fine particles, in which the filler is included in a filler-layer in the vicinity of surfaces of the toner-base particles, the number average particle diameter of the primary particles of the inorganic fine particles is 90 nm to 300 nm, and the average circularity of the toner is 0.95.Type: ApplicationFiled: August 4, 2005Publication date: April 24, 2008Inventors: Tomoko Utsumi, Satoshi Mochizuki, Hideki Sugiura, Tomoyuki Ichikawa, Minoru Masuda, Shinya Nakayama
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Publication number: 20080090164Abstract: The invention provides a developer having at least a toner, an aeration ratio (AR) of the developer measured by a powder rheometer being in a range of about 5.0 to about 10.0. It is preferable that the developer further contains an external additive of silica particles having a small diameter. The invention further provides a process cartridge having at least: a photoreceptor; and a developing device that comprises plura developer storage portions and that makes visible a latent image formed on the photoreceptor by using the developer. The invention further provides an image forming apparatus having at least the process cartridge.Type: ApplicationFiled: May 25, 2007Publication date: April 17, 2008Applicant: FUJI XEROX CO., LTD.Inventors: Tomohiro Takeda, Toyofumi Inoue, Daisuke Ishizuka
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Patent number: 7354688Abstract: A toner composition includes a binder, a colorant, and a surface additive package including a polydimethylsiloxane surface treated silica, a surface treated titania, and calcium sterate. The toner composition provides improved triboelectric charging properties.Type: GrantFiled: November 4, 2004Date of Patent: April 8, 2008Assignee: Xerox CorporationInventors: Scott M. Silence, Joo T. Chung, Juan A. Morales-Tirado
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Patent number: 7348119Abstract: The present invention provides a toner for developing an electrostatic latent image including: toner mother particles containing a binder resin and a colorant; and manganese compound particles having a ?-type crystalline structure, the production method thereof, and a developer containing the toner.Type: GrantFiled: June 28, 2005Date of Patent: March 25, 2008Assignee: Fuji Xerox Co., Ltd.Inventors: Tetsu Torigoe, Noriyoshi Takahashi, Teruo Sakai, legal representative, Emi Takahashi, Teigen Ri, Sueko Sakai
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Patent number: 7348118Abstract: The present invention relates to a non-magnetic mono-component toner composition and a preparation method thereof. Disclosed is a non-magnetic mono-component toner composition prepared by coating a spherical organic fine particle having a weight-average molecular weight (Mw) of 250,000-1,600,000 and an average particle size of 50-500 nm, a hydrophobic silica, and a metal oxide fine particle on a toner mother particle. The non-magnetic mono-component toner composition of the present invention ensures smooth toner supply because of good fluidity, reduces PCR contamination and deterioration of image quality, enables uniform toner layer formation on the development roller, prevents blocking at the blade of the development roller, and solves the low temperature double image problemin the non-imaging region at a low temperature. Therefore, it can be useful for an image printing apparatus adopting the non-magnetic mono-component development system in which the developing roller contacts the photoreceptor.Type: GrantFiled: December 16, 2004Date of Patent: March 25, 2008Assignee: LG Chem, Ltd.Inventors: Won-Sup Lee, Chang-Soon Lee, In-Hee Lim
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Publication number: 20080070141Abstract: A toner having a core with at least one resin and at least one colorant, and having on a surface thereof, an additive package including fluorinated polymer particles, and a method of forming toner particles having surface particles attached thereto, wherein the surface particles include fluorinated polymer particles, and the method includes aggregating a material with at least one resin and at least one colorant to produce toner particles, following aggregation, forming a mixture of the surface particles and the toner particles, and subjecting the mixture to a temperature above the glass transition temperature of the toner particles to coalesce the toner particles, whereby the surface particles become at least partially embedded within the surface of the toner particles.Type: ApplicationFiled: September 19, 2006Publication date: March 20, 2008Inventors: Maura A. Sweeney, Grazyna E. Kmiecik-Lawrynowicz, Robert D. Bayley
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Publication number: 20080063966Abstract: Single component toners having a core with a first latex having a specific glass transition temperature and molecular weight, further having a shell surrounding the core with a second latex having a specific glass transition temperature and molecular weight, and additives added thereto, and processes for producing the same. In embodiments, the toner is a non-magnetic single component toner produced by emulsion aggregation methods.Type: ApplicationFiled: September 7, 2006Publication date: March 13, 2008Inventors: Dennis A. Mattison, Vincenzo G. Marcello, Steven A. VanScott, Nancy S. Hunt, Chieh-Min Cheng, Dawn M. Jacobs
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Publication number: 20080050667Abstract: The present invention provides a custom color toner having a first particle size. Colored particles are attached to the surface of the base toner in an amount sufficient to provide a predetermined color to the base toner. The colored particles have a second particle size less than the first particle size.Type: ApplicationFiled: August 28, 2006Publication date: February 28, 2008Inventors: Lloyd A. Lobo, Eric C. Stelter
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Patent number: 7327974Abstract: An electrophotographic toner for visualizing an electrostatic latent image formed by an electrophotographic process, an electrostatic printing process, an electrostatic recording process, etc., which is produced in consideration of the environment and safety. The electrophotographic toner includes a fixing resin and a colorant. The electrophotographic toner is a black toner using a titanium compound containing no carbon black as the colorant. The electrophotographic toner may be an electrophotographic two-component black toner using magnetic iron oxide containing no carbon black as the colorant.Type: GrantFiled: September 11, 2003Date of Patent: February 5, 2008Assignee: Ricoh Printing Systems, Ltd.Inventors: Shigenori Yaguchi, Ryuuichi Shimizu, Hiroshi Ueno
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Patent number: 7316879Abstract: In an imaging color toner employing a photofixing system, a binder resin, which contains, as a principal component, a polyester resin obtained by mixing a first polyester resin having a softening point Tsp of not lower than 120° C. and lower than 170° C. with a second polyester resin having a softening point Tsp of not lower than 80° C. and lower than 110° C. in a weight ratio of 80:20 to 20:80, is used. The color toner is used in an electrophotographic process and other imaging processes.Type: GrantFiled: August 24, 2001Date of Patent: January 8, 2008Assignee: Fuji Xerox Co., Ltd.Inventors: Yasushige Nakamura, Shinichi Yaoi, Tomoaki Tanaka, Yoshimichi Katagiri
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Patent number: 7316880Abstract: A toner for developing an electrostatic charge image comprising a resin, a colorant, and a particle having domain-matrix structure and the particle having two or more kinds of metal elements.Type: GrantFiled: August 23, 2004Date of Patent: January 8, 2008Assignee: Konica Minolta Holdings, Inc.Inventors: Yasuko Yamauchi, Hiroshi Yamazaki, Masafumi Uchida, Kenji Yamane
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Publication number: 20070298343Abstract: The invention relates to a developer for developing electrostatic images. The developer includes magnetic carrier particles at a loading of from 60 to 99 weight percent of the developer. Toner particles are at a loading of 1 to 40 weight percent of the developer. The toner particles include a resin core particle having an outer surface and 0.05 to 5 weight percent a first metal oxide powder is substantially fixed to the outer surface. The toner particles further include 0.05 to 2 weight percent of a second metal oxide powder that is substantially free to transfer between outer surface of the toner particles and an outer surface of the magnetic carrier surface.Type: ApplicationFiled: June 23, 2006Publication date: December 27, 2007Inventors: Kevin D. Lofftus, Satyanarayan Srinivsan, David D. Putnam, Peter S. Alexandrovich
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Patent number: 7312009Abstract: The present invention relates to a non-magnetic mono-component toner comprising a toner mother particle, and a coating layer formed on the mother particle where the coating layer comprises fatty acid metal salt having average particle size of 0.05 to 3.0 ?m, a first organic particle having average particle size of 0.3 to 2.0 ?m, a second organic particle having average particle size of 0.05 to 0.25 ?m, and silica having average particle size of 0.006 to 0.04 ?m. The color toner has narrow charge distribution, high chargeability, a low environmental dependence, and excellent image quality, transfer efficiency, and long-term stability by significantly reducing the contamination of the charging elements.Type: GrantFiled: May 13, 2005Date of Patent: December 25, 2007Assignee: LG Chem, LtdInventors: Hyeung-Jin Lee, Joo-Yong Park, Chang-Soon Lee
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Patent number: 7309555Abstract: The present invention relates to a non-magnetic monocomponent color toner and a preparing method thereof. In the non-magnetic monocomponent color toner including a toner mother particle, silica and titanium dioxide, the toner mother particle comprises a specific shaped particle size distribution of the charge control agents, and thus, providing non-magnetic monocomponent color toner with a narrow charge distribution and good chargeability. Accordingly, the color toner does not cause contamination in the non-imaging region. Also, because it has superior image density and printing efficiency and significantly improved charge maintenance, it has good long-term stability.Type: GrantFiled: January 12, 2005Date of Patent: December 18, 2007Assignee: LG Chem, LtdInventors: Hyeung-Jin Lee, Joo-Yong Park, Chang-Soon Lee
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Patent number: 7309556Abstract: A developer includes black toner particles and carrier particles, the black toner particles including at least one binder, at least one black colorant and one or more external additives, wherein the toner particles comprise from about 7 to about 15 pph of the developer, and wherein the toner particles exhibit a triboelectric charge of from about ?25 to about ?50 ?C/g at toner particle concentrations of about 7 to about 15 pph of the developer. The developer is ideally suited for use in a high speed (greater than 100 prints per minute) semiconductive magnetic brush development apparatus. Preferably, the black toner particles include a styrene acrylate binder, and the external additives include from about 1.3 to about 2.1% by weight of the toner particles of a first silica having an average particle size of from about 35 to about 45 nm, from about 0.5 to about 1.0% by weight of the toner particles of a second silica having an average particle size of from about 135 to about 160 nm, and from about 0.Type: GrantFiled: March 21, 2005Date of Patent: December 18, 2007Assignee: Xerox CorporationInventors: Maria N. V. Mc Dougall, Richard P. N. Veregin, Vladislav Skorokhod, Mary L. Mc Stravick, Deepak R. Maniar, Paul W. Morehouse, Jr., Rachael L. Mc Grath, Jackie Parker, Shigang Qui, Mary B. Schlitzer, Michael D. Thompson, Christopher M. Pattison, Thomas C. Dombroski
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Patent number: 7309554Abstract: A negatively chargeable toner containing: resin particles containing a colorant; and an external additive which coats the surface of the resin particles, wherein the external additive contains; first silica particles having a number mean primary particle size of 5 to 20 nm and second silica particles having a number mean primary particle size of 30 to 50 nm; surface-modified silica particles which are surface modified by wet treatment using an oxide or hydroxide of at least one metal selected from the group consisting of titanium, tin, zirconium and aluminum, and are further subjected to hydrophobic treatment; and aluminum oxide-silicon dioxide composite oxide particles obtained by flame hydrolysis and hydrophobic treatment.Type: GrantFiled: July 15, 2004Date of Patent: December 18, 2007Assignee: Seiko Epson CorporationInventor: Nobuhiro Miyakawa
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Publication number: 20070281233Abstract: A toner comprising a resin and having on a surface thereof, an additive package comprising coated strontium titanate.Type: ApplicationFiled: May 31, 2006Publication date: December 6, 2007Inventor: Thomas R. Pickering
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Publication number: 20070281232Abstract: A toner, and an electrophotographic apparatus and an electrophotographic process cartridge using the toner are provided having excellent charge stability without adversely affecting electric properties of the toner even when used for a long period of time and having excellent image density stability without bringing about image deletion and blurring. The toner includes colored particles containing at least a binder resin and a colorant, and two or more external additives. At least one of the external additives includes hydrophobic treated mesoporous particles, and the mesoporous particles are inorganic particles of at least one type selected from the group consisting of silica, titanium oxide, alumina, cerium oxide, and strontium titanate.Type: ApplicationFiled: May 29, 2007Publication date: December 6, 2007Applicant: CANON KABUSHIKI KAISHAInventor: Kimihiro Yoshimura
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Patent number: 7300734Abstract: A toner composition comprising a binder, colorant, and a charge control surface additive mixture comprising a mixture of a first titanium dioxide possessing a first conductivity and a second titanium dioxide possessing a second conductivity and which second conductivity is dissimilar than the first conductivity; wherein the mixture of the first titanium dioxide and the second titanium dioxide is selected in a ratio sufficient to impart a selected triboelectric charging characteristic to the toner composition.Type: GrantFiled: December 3, 2004Date of Patent: November 27, 2007Assignee: Xerox CorporationInventors: Maria N. V. McDougall, Richard P. N. Veregin
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Patent number: 7300736Abstract: A toner contains: (A) a binder resin; (B) a colorant; (C) a charge controlling agent; and (D) an additive. (A) contains: a polyester resin containing no tetrahydrofuran-insoluble component; and having components having a molecular weight not greater than 5×102 present in an amount of 4% or less by weight, a main peak present in a molecular weight range of from 3×103 to 9×103 as determined by gel permeation chromatography. (C) contains: a metal salt of salicylic acid or salicylic acid derivative. (D) contains: a hydrophobized silica having a primary particle diameter of from 0.01 to 0.03 ?m; and a hydrophobized titanium oxide having a primary particle diameter of from 0.01 to 0.03 ?m, a specific surface area of from 60 to 140 m2/g, one or more water-soluble components in an amount of 0.2% or more by weight, a transmittance not less than 35% for light having a wavelength of 300 nm and a transmittance not less than 80% for light having a wavelength of 600 nm.Type: GrantFiled: May 27, 2004Date of Patent: November 27, 2007Assignee: Ricoh Company, Ltd.Inventors: Hiroyuki Fushimi, Osamu Uchinokura
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Patent number: 7297455Abstract: A toner is composed primarily of toner particles containing at least a binder resin, a colorant and a wax, and inorganic fine particles. The binder resin is one which has at least a polyester unit and is synthesized by using as a catalyst one or more compounds selected from titanium chelate compounds each having a specific structure and hydrates of the titanium chelate compounds. The toner has superior fixing performance and high-temperature anti-offset properties and is superior in charge stability even when used for a long time.Type: GrantFiled: July 28, 2004Date of Patent: November 20, 2007Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Fujikawa, Yuko Sato, Nobuyoshi Sugahara, Takayuki Itakura
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Publication number: 20070254230Abstract: A process for toner preparation includes forming toner particles by mixing an emuslion comprising at least binder resin and a colorant, aggregating the toner particles, and blending external additives with the toner particles in a blender to form a toner, wherein the blender has a blend intensity of from about 90.5 to about 100.5 W/lb, a specific blend energy of from about 20.3 to about 35.3 W-h/lb and a blender loading density of from about 0.25 to about 0.55 lb/L.Type: ApplicationFiled: June 26, 2006Publication date: November 1, 2007Applicant: XEROX CORPORATIONInventors: Juan A. Morales-Tirado, Daniel A. Harrington, William H. Hollenbaugh, Vladislav Skorokhod, Wafa F. Bashir, Jackie B. Parker, Robert E. Grace, James M. Chappell, Karen A. Moffat, Richard P.N. Veregin, Cuong Vong
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Patent number: 7288352Abstract: A toner composition including a binder, a colorant, and a surface additive package including a surface treated silica, a surface treated titania, and magnesium stearate.Type: GrantFiled: May 3, 2005Date of Patent: October 30, 2007Assignee: Xerox CorporationInventor: Thomas R. Pickering
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Patent number: 7276320Abstract: A method of forming toner particles having surface particles attached thereto includes the steps of aggregating a material of at least one binder material and at least one colorant to produce toner particles, following aggregation, forming a mixture of the surface particles and the toner particles, and subjecting the mixture to a temperature above the glass transition temperature of the toner particles to coalesce the toner particles, whereby the surface particles become at least partially embedded within the surface of the toner particles. Toner particles prepared by such method include a core comprised of at least one binder and at least one colorant, and surface particles at an external surface of the toner particles, wherein at least about 50% of the surface particles are substantially completely covered by a portion of binder and a majority of the surface particles protrude from the toner particle surface a distance of at least 50% of the average particle size of the surface particles.Type: GrantFiled: January 19, 2005Date of Patent: October 2, 2007Assignee: Xerox CorporationInventors: Grazyna E. Kmiecik-Lawrynowicz, Maura A. Sweeney, Robert D. Bayley, Ronald J. Koch, Mary L. McStravick, Daniel W. Asarese
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Publication number: 20070212629Abstract: Disclosed is a toner for use in an image forming apparatus using an amorphous silicon photoconductor as a latent image carrier, and having a cleaning blade for removing the toner remaining on the photoconductor after a transfer step. The toner has a friction coefficient with the photoconductor in a range of 0.3 to 0.6. At least inorganic fine particles such as titanium oxide are externally added to the toner. The inorganic fine particles have a number-average primary particle size of 30 nm or more.Type: ApplicationFiled: March 6, 2007Publication date: September 13, 2007Inventors: Naruo Yabe, Kousuke Satou
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Patent number: 7267920Abstract: The present invention provides a toner for developing an electrostatic latent image comprising of: toner particles containing at least a binder resin, a colorant and a releasing agent; wherein a volume-average particle diameter of the toner particles is in a range of about 5 to 8 ?m; an average of shape factor SF1 of the toner particles is in a range of about 125 to 140; and an arithmetical mean undulation height of the surface of the toner particles at the 90% point on the cumulative distribution curve is in a range of about 0.15 to 0.25 ?m. Further, the present invention provides an electrostatic latent image developer containing the toner. The invention also provides a method for producing the toner.Type: GrantFiled: September 9, 2004Date of Patent: September 11, 2007Assignee: Fuji Xerox Co., Ltd.Inventors: Hiroshi Nakazawa, Yutaka Sugizaki, Kazufumi Tomita, Shuji Sato, Akira Matsumoto, Yosuke Tsurumi, Masanobu Ninomiya, Takao Ishiyama
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Patent number: 7258959Abstract: The object of the present invention is to provide a developer having a sharp charge amount distribution and bringing out high-quality image without substantially smearing a charging unit, developing units, a photoconductor, and an intermediate transferring member by the developer, namely, a developer capable of providing an appropriate image density and exhibiting extremely little background smear even when used over a long period of time and repeatedly used for a number of sheets of paper as well as to provide an image forming apparatus for electrophotography using the developer.Type: GrantFiled: September 26, 2005Date of Patent: August 21, 2007Assignee: Ricoh Company, Ltd.Inventors: Shinya Nakayama, Satoshi Mochizuki, Yasuaki Iwamoto, Yasuo Asahina, Kazuhiko Umemura, Hideki Sugiura, Hisashi Nakajima, Tomoyuki Ichikawa, Tomoko Utsumi, Koichi Sakata, Akihiro Kotsugai, Osamu Uchinokura, Masayuki Ishii
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Publication number: 20070190443Abstract: 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 MgxSiyOx+2y where each of x and y is an integer, and a number average secondary particle diameter of from 0.02 ?m to 2 ?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 MgxSiyOx+2y where each of x and y is an integer and which has a surface treated with a fatty acid.Type: ApplicationFiled: February 1, 2007Publication date: August 16, 2007Inventors: Masayuki Hagi, Takuya Kadota, Hiroaki Katoh, Atsushi Yamamoto, Katsunori Kurose, Yoshihiro Mikuriya, Masahide Inoue, Hideaki Yasunaga, Minoru Nakamura, Yoshimichi Ishikawa, Hiroyuki Murakami
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Patent number: 7252915Abstract: The present invention relates to a magnetic mono-component toner composition, and more particularly to a mono-component toner composition that comprises magnetic toner particle comprising a binder resin, a magnetic component, and a charge control agent; a hydrophobic treated silica having a specific surface area of 20 to 80 m2/g; a hydrophobic treated silica having a specific surface area of 130 to 230 m2/g; and a metal oxide fine powder. A magnetic mono-component toner composition of the present invention has such good flowability that it provides smooth toner supply even when the developing roller surface has been worn due to long time use, and it has such excellent uniform chargeability that it prevents image deterioration (“wave” patterns of toner may form on developing roller, that is, magnetic sleeve) by forming an uniform toner layer on the developing roller.Type: GrantFiled: December 24, 2002Date of Patent: August 7, 2007Assignee: LG Chem, Ltd.Inventors: Won-Sup Lee, Chang-Soon Lee, In-Hee Lim
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Patent number: 7252916Abstract: A non-magnetic one-constituent developing agent is an electro-photographic developing agent that provides high quality images without fogging, scattering of toners and ineffective development by maintaining stable charges and a uniform distribution of toners over an extended lifetime in a developing apparatus of an electro-photographic image processing device. In addition, the developing agent has deodorizing, anti-bacterial and sterilizing functions.Type: GrantFiled: August 25, 2004Date of Patent: August 7, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Duck-hee Lee, Jong-moon Eun
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Patent number: 7250243Abstract: A nonmagentic one-component toner for an electrophotographic image forming apparatus includes a toner with toner particles, a binder resin having a coloring agent, a charging control agent, and a release agent, and an external additive added to the toner particles. The external additive includes approximately 0.1 to 3.0 wt % of silica having a charge opposite to the toner particles, approximately 0.1 to 3.0 wt % of silica having a same charge as the toner particles, and approximately 0.1 to 4.0 wt % of titanium dioxide.Type: GrantFiled: May 12, 2004Date of Patent: July 31, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Duck-hee Lee, Jong-moon Eun
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Patent number: 7250242Abstract: A toner comprising a resin binder and a colorant comprising a composite oxide of two or more metals, wherein the composite oxide has a BET specific surface area of 0.5 to 7 m2/g and a saturation magnetization of from 1 to 40 Am2/kg; and a two-component developer comprising the above toner and a carrier having a saturation magnetization of from 40 to 100 Am2/kg. The toner can be used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: October 7, 2003Date of Patent: July 31, 2007Assignee: Kao CorporationInventors: Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima
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Patent number: 7244536Abstract: A toner comprising a resin binder, a black colorant comprising a composite oxide of two or more metals, and a charge control agent comprising a quaternary ammonium salt. The toner is suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: May 16, 2002Date of Patent: July 17, 2007Assignee: Kao CorporationInventors: Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima, Yasuyuki Tamane
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Patent number: 7229735Abstract: A toner composition for use in a xerographic or electrostatographic imaging process. The toner composition includes a toner particle and an optional primary external surface additive and a friable external surface additive. The friable external surface additive may also be a material that is capable of functioning as a primary external surface additive. The friable external surface additive is generally larger than the primary surface additive and capable of having portions of the friable particle broken or abraded off during the imaging process. The particles that are abraded off the friable additive can replace the primary external additive particles that become embedded into toner particles during the development process. The friable additives contribute to reducing toner aging and provide a toner with satisfactory flow and triboelectric properties.Type: GrantFiled: July 26, 2004Date of Patent: June 12, 2007Assignee: Xerox CorporationInventors: Thomas R. Pickering, Louis V. Isganitis
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Patent number: 7217486Abstract: The present invention provides a toner containing toner mother particles containing a binder resin and a colorant having added thereinto external additives, e.g., positively electrifiable silica fine particles, negatively electrifiable silica fine particles, titanium oxide fine particles and a long chain fatty acid or a salt thereof, wherein the external additives are added by multistage process, thereby is low in desorption of external additives, has the electrification property for a long period of time, shows high flowability and transfer efficiency, and is not accompanied by the reduction of image density.Type: GrantFiled: January 16, 2004Date of Patent: May 15, 2007Assignee: Seiko Epson CorporationInventors: Hiroshi Kato, Nobuhiro Miyakawa
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Patent number: 7217485Abstract: A toner for electrophotography contains a binder resin, a charge control agent, and a colorant. The colorant is a black iron oxide compound containing 10 to 45% by weight of titanium component calculated in terms of Ti atom in relation to Fe atom when measured by wavelength dispersive X-ray fluorescence spectrometry. Peaks at Bragg angle 2? of the toner to CuK? X-ray are peak A at 32.9 degrees ±0.3 degrees and peak B at 35.5 degrees ±0.3 degrees, and X ray intensity ratio between peaks A and B (A/B) is in the range of 0.3 to 2.0 at a scan speed of 0.5 to 4 degrees/min.Type: GrantFiled: March 16, 2004Date of Patent: May 15, 2007Assignee: Ricoh Company, Ltd.Inventors: Kumi Hasegawa, Mitsuo Aoki, Bing Shu, Toyoshi Sawada, Keiko Shiraishi, Masashi Nagayama, Shinichi Kuramoto
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Patent number: 7214459Abstract: The invention provides a toner for developing electrostatic charged images comprising toner mother particles containing a binder resin and a colorant, and an external additive, wherein: the average of shape factors SF1 of the toner mother particles represented by the following Formula (1) is 140 or less; the external additive contains higher alcohol particles having a volume-average particle diameter of 1 to 12 ?m; and the content of the higher alcohol particles having a diameter equal to or less than the volume-average particle diameter of the toner mother particles is in a range of 0.15 to 2.5 parts by weight with respect to 100 parts by weight of the toner mother particles. In addition, the invention provides a developer for developing electrostatic charged images comprising the toner. Further, the invention provides an image forming method using the toner.Type: GrantFiled: September 8, 2004Date of Patent: May 8, 2007Assignee: Fuji Xerox Co., Ltd.Inventors: Akihiro Iizuka, Atsuhiko Eguchi, Masahiro Okita, Yasuhiro Oya
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Patent number: 7208252Abstract: Magnetic toner compositions, conductive developer compositions, and methods for producing images in a hybrid jumping development system, more specifically, in a magnetic ink character recognition system, are disclosed. The developer compositions contain coated magnetic toner particles and coated carrier particles. The toner compositions include a resin, colorant, wax, magnetic component, and surface additives of coated silica, titania, and zinc stearate.Type: GrantFiled: June 30, 2004Date of Patent: April 24, 2007Assignee: Xerox CorporationInventors: Michael L. Grande, William H. Hollenbaugh, Jr.
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Patent number: 7187396Abstract: Laser marking of plastic material is achieved by incorporating into the plastic a laser marking particulate additive having a particle size of less than 100 nm. A mixed oxide particle of tin and antimony having a particle size of 10–70 nm is useful as a laser marking additive when using a YAG laser. A metallic powder can further be added to improve marking contrast.Type: GrantFiled: November 1, 2004Date of Patent: March 6, 2007Assignee: Engelhard CorporationInventors: James B. Carroll, Jr., Steven A. Jones
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Patent number: 7186493Abstract: A toner for developing an electrostatic image is disclosed. The toner comprises toner particles comprising a resin and a colorant, and the toner comprises metal oxide particles have a domain-matrix structure comprising a domain and a matrix.Type: GrantFiled: March 22, 2004Date of Patent: March 6, 2007Assignee: Konica Minolta Holdings, Inc.Inventors: Kenji Yamane, Ken Ohmura, Yasuko Yamauchi
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Patent number: 7169525Abstract: The object of the present invention is to provide a toner which is excellent in shelf stability for a long term by producing the toner through controlling the dispersion condition of the wax around the toner surface and through improving, not only the off-set resistance of the toner for rendering the fixing properties of the toner advantageous, but also the blocking resistance of the toner, wherein the toner contains a binder resin, a colorant, and a wax, wherein the amount of the wax is 3% by mass to 21% by mass, and the amount of the wax which is present in the portion of the toner particle which is in the range of from the outermost surface to the depth of 0.3 ?m in the toner particle is in a specified range, and at least a part of the wax is present as plural individual wax dispersion particles involved in the toner particles.Type: GrantFiled: July 20, 2005Date of Patent: January 30, 2007Assignee: Ricoh Company, Ltd.Inventors: Hideki Sugiura, Satoshi Mochizuki, Yasuaki Iwamoto, Yasuo Asahina, Kazuhiko Umemura, Tomoyuki Ichikawa, Shinya Nakayama, Tomoko Utsumi, Koichi Sakata
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Patent number: 7169524Abstract: The present invention provides a toner comprising a binder resin, a colorant and an infrared absorbing agent, wherein tan ? (loss elastic modulus G?/storage elastic modulus G?) of the toner at 120° C. is in the range of 3 to 6, and an image-forming method using the toner in which toner images on a recording medium are light irradiated by a flash lamp having a light-emitting energy of 1.0 to 5.0 J/cm2 so that the toner images are fixed on the recording medium.Type: GrantFiled: January 26, 2004Date of Patent: January 30, 2007Assignee: Konica Minolta Business Technologies, Inc.Inventors: Minoru Nakamura, Yoshihiro Mikuriya, Masahide Inoue, Masahiro Anno
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Patent number: 7163774Abstract: A toner including a binder resin including a crystalline polyester and a non-crystalline resin; a release agent; and a black metal-containing material having a saturation magnetization not greater than 50 emu/g. A toner container containing the toner. A fixing method including passing a support with the toner image thereon through a nip between two cylindrical rollers while applying a pressure not greater than 1×105 Pa to the two cylindrical rollers, wherein one of the cylindrical rollers which contacts the toner image has a thickness not greater than 1.0 mm. An image forming method including developing an electrostatic image with the toner to form a toner image; transferring the toner image onto a receiving material; and fixing the toner image by the fixing method mentioned above. A process cartridge including an image bearing member and a developing device using the toner.Type: GrantFiled: February 6, 2004Date of Patent: January 16, 2007Assignee: Ricoh Company LimitedInventors: Keiko Shiraishi, Toyoshi Sawada, Masashi Nagayama, Shinichi Kuramoto, Mitsuo Aoki, Kumi Hasegawa, Bing Shu
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Patent number: 7160663Abstract: A toner includes toner particles and an inorganic fine powder mixed with the toner particles. The toner particles contain a binder resin, a coloring agent, a releasing agent, and a sulfur-containing resin. The toner particles contain at least one element selected from the group consisting of magnesium, calcium, barium, zinc, aluminum, and phosphorus and satisfy the relationship: 4?T/S?30 wherein T represents the total content of the element in ppm, and S represents the content of sulfur in ppm. The weight-average particle diameter (D4) of the toner is in the range of 3 to 10 ?m. The average circularity of the toner is within the range of 0.950 to 0.995.Type: GrantFiled: March 25, 2004Date of Patent: January 9, 2007Assignee: Canon Kabushiki KaishaInventors: Keiji Komoto, Yasushi Katsuta, Yushi Mikuriya, Takeshi Kaburagi, Emi Tosaka
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Patent number: 7157201Abstract: A toner for developing a latent electrostatic image including a base of toner particle which contains a binder resin and a coloring agent, and an external additive. Herein, a plurality of the base of toner particle has a volume average particle diameter (Dv) of 3 ?m to 7 ?m, a ratio (Dv/Dn) of the volume average particle diameter (Dv) to a number average particle diameter (Dn) is 1.01 to 1.25, a plurality of the base of toner particle contains 15% by number or less of the base of toner particle having a particle diameter of 0.6 ?m to 2.0 ?m, a plurality of the base of toner particle has a circularity of 0.930 to 0.990 on average, the binder resin contains a modified polyester resin, and the toner contains 0.3 parts by weight to 5.0 parts by weight of the external additive, relative to 100 parts by weight of the base of toner particle.Type: GrantFiled: June 27, 2003Date of Patent: January 2, 2007Assignee: Ricoh Company, Ltd.Inventors: Masami Tomita, Tadao Takikawa, Tomoyuki Ichikawa, Fumihiro Sasaki, Toshiki Nanya, Hiroto Higuchi, Shigeru Emoto, Shinichiro Yagi, Naohito Shimota, Maiko Kondo
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Patent number: 7157200Abstract: A black toner of toner particles including at least one binder, at least one black colorant, and a package of external additives is described, wherein the at least one binder includes a styrene acrylate binder and wherein the external additives include each of a first silica having an average particle size of from about 35 to about 45 nm, a second silica having an average particle size of from about 135 to about 160 nm, and a titania having an average particle size of from about 35 to about 45 nm. Also described is a developer that includes the black toner and carrier particles comprising a core of ferrite coated with a coating comprising a polymethyl methacrylate polymer and fluoro-copolymer, carbon black and melamine beads. The black toner and developer are preferably used in a semiconductive magnetic brush development system.Type: GrantFiled: May 6, 2004Date of Patent: January 2, 2007Assignee: Xerox CorporationInventors: Mary L. Mc Stravick, Paul C. Julien, Sue E. Blaszak, William H. Hollenbaugh, Jr.
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Patent number: 7150952Abstract: A toner for developing an electrostatic image is disclosed. The toner particles containing a binder resin containing a polyester resin or a polyol resin and a colorant, and the toner particles contain aluminum in an amount of 0.007 to 0.140% by weight, chlorine in an amount of 0.002 to 0.412% by weight, and the toner particles have an average circular degree of 0.94 to 0.99 and an average circle equivalent diameter of from 2.6 to 7.4 ?m.Type: GrantFiled: February 26, 2004Date of Patent: December 19, 2006Assignee: Konica Minolta Holdings, Inc.Inventors: Asao Matsushima, Hiroshi Yamazaki, Ken Ohmura, Eiichi Yoshida
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Patent number: 7150953Abstract: A developer capable of providing an excellent image without causing a charging failure even after a long-term and repeated use contains a toner particle having a binder resin and a colorant, an inorganic fine particle, and a conductive fine particle, in which a volume average particle diameter Da of the conductive fine particle and an number average primary particle diameter Db of the inorganic fine particle satisfy the expression (1) below, and a rate of liberation “a” of the conductive fine particle from the toner particle is 40 to 95% and a rate of liberation “b” of the inorganic fine particle from the toner particle is 0.1 to 5% Da?10Db.Type: GrantFiled: September 12, 2003Date of Patent: December 19, 2006Assignee: Canon Kabushiki KaishaInventors: Katsuhisa Yamazaki, Takashige Kasuya, Tsuyoshi Takiguchi, Kaori Hiratsuka
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Patent number: 7144666Abstract: A toner having toner particles containing a binder resin and a colorant; and a first external additive having 0.1 to 3.0 wt % of large silica particles with an average particle size of 20 to 200 nm; a second external additive having 0.1 to 3.0 wt % of small silica particles with an average particle size of 5 to 20 nm; a third external additive having 0.1 to 2.0 wt % of hydrophobic titanium dioxide microparticles with a resistance of 105 to 1012 ?cm; and a fourth external additive having at least one of 0.1 to 2.0 wt % of conductive titanium dioxide particles with a resistance of 1 to 105 ?cm and 0.1 to 2.0 wt % of positively chargeable aluminum oxide particles. Therefore, a thin toner layer with a uniform toner amount is formed on a toner carrier and stable charge distribution and toner flowability are maintained for a long time, thereby resulting in prevention of fog and toner scattering, and improvements in developing efficiency and toner durability.Type: GrantFiled: February 20, 2004Date of Patent: December 5, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Duck-hee Lee, Jong-moon Eun