Elemental Metal Or Alloy Magnetic Component Patents (Class 430/106.3)
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Patent number: 9688798Abstract: The method for manufacturing a polymer of the present invention is a method for manufacturing a polymer where a hydroxy group is added to a terminal of either one of a homopolymer of a non-conjugated olefin, a homopolymer of a conjugated diene compound, and a copolymer of a conjugated diene compound and a non-conjugated olefin, the method comprising: a first reaction step of reacting a hydrocarbon containing at least either one of the non-conjugated olefin and the conjugated diene compound with an organic aluminum compound, using a rare earth element compound-containing catalyst; a second reaction step of reacting a first reactant obtained from the first reaction step with oxygen; and a third reaction step of reacting a second reactant obtained from the second reaction step with at least either one of water and alcohol.Type: GrantFiled: August 22, 2012Date of Patent: June 27, 2017Assignee: BRIDGESTONE CORPORATIONInventors: Shojiro Kaita, Yasuo Wakatsuki
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Publication number: 20150111139Abstract: An electrostatic charge image developing toner includes a binder resin, toner particles containing an acylglycerol, and an external additive, wherein at least one of hydroxyl groups in the acylglycerol is esterified with an alkyl monocarboxylic acid that contains a substituted or unsubstituted alkyl group having from 12 to 22 carbon atoms, and a content of a portion esterified with the alkyl monocarboxylic acid that contains the alkyl group having the same carbon number is 95% by weight or greater with respect to the total weight of the acylglycerol.Type: ApplicationFiled: April 16, 2014Publication date: April 23, 2015Applicant: FUJI XEROX CO., LTD.Inventors: Yuki TAKAMIYA, Eisuke IWAZAKI, Shuji SATO, Noriyuki MIZUTANI
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Patent number: 9005858Abstract: A toner to develop electrostatic latent images, which has surface characteristics that may simultaneously improve charge uniformity, charge stability, transferability, and cleaning ability. The toner to develop electrostatic latent images may include core particles comprising a binder resin, a colorant, and a releasing agent; and an external additive including silica particles and titanium dioxide particles, wherein the external additive is attached to external surfaces of the core particles, wherein an iron intensity [Fe], a silicon intensity [Si], and a titanium intensity [Ti] that are measured by X-ray fluorescence (XRF) satisfy both conditions, 0.004?[Si]/[Fe]?0.009 and 0.8?[Ti]/[Fe]?2.Type: GrantFiled: March 12, 2013Date of Patent: April 14, 2015Assignee: Samsung Electronics Co., Ltd.Inventors: Se-young Yoon, Sung-jin Park, Hong-chul Shin, Seung-sik Woo, Hae-ree Joo
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Patent number: 8846288Abstract: When being blended in a toner, a barium titanate external additive for toner enhances, in particular, the toner fluidity, electrical properties, and other relevant performance; concurrently achieves high image density and reduced background fog in a printer using the toner; and further reduces image defects, such as void, fading, and the like. An industrially advantageous producing method of the barium titanate external additive for toner is also provided. The external additive for toner of the present invention includes spherical barium titanate having a specific gravity of 5.6 g/ml or less.Type: GrantFiled: January 25, 2007Date of Patent: September 30, 2014Assignee: Nippon Chemical Industrial Co., Ltd.Inventors: Kazuo Ochiai, Shinji Tanabe, Naoaki Narishige
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Patent number: 8828633Abstract: To obtain a toner which has excellent charge rise and stability, tends to have a sharp charge distribution, has excellent pigment dispersion properties, exhibits no disarray in an image even during a high-speed copying operation, and can stably output high-resolution images. A toner comprising toner particle containing a binder resin, a colorant, resin PA, and resin PB, wherein the resin PA has unit A represented by Formula (1), the resin PB has unit B represented by Formula (2), a content “a” of the unit A in the toner particle is 2.00 ?mol/g or more, and a molar ratio b/a of the content “a” and a content “b” of the unit B in the toner particle is 0.10 or more and 10.00 or less.Type: GrantFiled: December 20, 2010Date of Patent: September 9, 2014Assignee: Canon Kabushiki KaishaInventors: Hitoshi Itabashi, Takashi Kenmoku, Harumi Takada
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Patent number: 8617776Abstract: A method and system for printing documents with one or more embedded security features is provided. Security features are embedded in the document by co-printing magnetic and non-magnetic toner on a receiver before fixation by a fixing station. The combination of magnetic and non-magnetic toners in the image results in image elements that easily show alteration or are undetectable by visual means.Type: GrantFiled: November 16, 2011Date of Patent: December 31, 2013Assignee: Eastman Kodak CompanyInventors: Jason Morgan, John F. Crichton, Raymond Rossborough, Timothy G. Armstrong, Matthias H. Regelsberger
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Publication number: 20130196258Abstract: A toner includes a binder resin including an amorphous polyester resin (A), a crystalline polyester resin (B), and a polyurethane thermoplastic elastomer (C).Type: ApplicationFiled: July 24, 2012Publication date: August 1, 2013Applicant: FUJI XEROX CO., LTD.Inventors: Yoshihiro INABA, Daisuke YOSHINO, Akira IMAI, Takako KOBAYASHI, Koji HORIBA, Masahiro OKI, Ryosaku IGARASHI
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Publication number: 20120070770Abstract: The present disclosure relates to a magnetic toner composition. The toner composition includes one or more resins, and spherical ferromagnetic nanoparticles. Also provided is a process for preparing these toners including ferromagnetic nanoparticles. In embodiments, the aggregation of the toner is conducted at a pH greater than about 7, without the use of a coagulant. Additionally, in embodiments, freezing (stopping particle growth) and coalescence of the toner particles may be conducted at a pH greater than about 9. In yet other embodiments, the process may be conducted under an inert gas such as argon to avoid oxidation of the ferromagnetic nanoparticles during toner preparation.Type: ApplicationFiled: September 21, 2010Publication date: March 22, 2012Applicant: XEROX CORPORATIONInventors: Ke Zhou, Karen Ann Moffat, Richard P.N. Veregin, Paul J. Gerroir, Cuong Vong
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Patent number: 8101326Abstract: A method and system for printing documents with one or more embedded security features is provided. Security features are embedded in the document by co-printing magnetic and non-magnetic toner on a receiver before fixation by a fixing station. The combination of magnetic and non-magnetic toners in the image results in image elements that easily show alteration or are undetectable by visual means.Type: GrantFiled: May 19, 2006Date of Patent: January 24, 2012Assignee: Eastman Kodak CompanyInventors: Jason Morgan, John F. Crichton, Raymond Rossborough, Timothy G. Armstrong, Matthias H. Regelsberger
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Patent number: 8084174Abstract: An object of the present invention is to provide a toner excellent in ability to prevent electrostatic offset and fixation tailing. Provided is a toner including toner particles each containing at least a binder resin, a wax, and a magnetic iron oxide, and inorganic fine particles, in which the magnetic iron oxide contains at least a Ti component, an Al component, an Si component, and an Fe component; and the each component has some particular characteristics.Type: GrantFiled: September 29, 2009Date of Patent: December 27, 2011Assignee: Canon Kabushiki KaishaInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Kouji Nishikawa, Kentarou Kamae, Takashige Kasuya
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Patent number: 8080357Abstract: When being blended particularly in a color toner, a barium titanate external additive for toner enhances the toner fluidity, electrical properties, and other relevant performance; concurrently achieves high image density and reduced background fog in a color printer using the toner; and further retains high image quality even under a high-temperature high-humidity environment and a low-temperature low-humidity environment. An industrially advantageous producing method of the barium titanate external additive for toner is also provided. The external additive for toner of the present invention includes spherical barium titanate having undergone coating treatment with a hydrophobicizing agent.Type: GrantFiled: January 25, 2007Date of Patent: December 20, 2011Assignee: Nippon Chemical Industrial Co., Ltd.Inventors: Kazuo Ochiai, Shinji Tanabe, Naoaki Narishige
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Patent number: 7570904Abstract: In the image forming apparatus by: visualizing an electrostatic latent image formed on an electrostatic charge carrying member; transferring a toner image, which is thus visualized, to a recording medium, or to a recording medium through an intermediate transfer material; and fixing the toner image, which is thus transferred to the recording medium, to obtain a recorded image, the toner includes at least a fixing resin, a colorant, a releasing agent, and an external additive, the toner has an average particle diameter in a range of from 4 to 12 ?m and including no particle having a diameter of 45 ?m or more, a ratio of a toner adhesion amount in a character part to a toner adhesion amount in a solid image part upon printing is more than 0.5 and less than 4, and the toner adhesion amount in a character part is 1.6 mg/cm2 or less.Type: GrantFiled: May 26, 2005Date of Patent: August 4, 2009Assignee: Ricoh Printing Systems, Ltd.Inventors: Shigenori Yaguchi, Junji Kobayashi, Hirobumi Ouchi, Tomonari Hokkyo
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Publication number: 20090186288Abstract: The object of the present invention is to provide a magnetic toner enabling an image with high image density and excellent image reproducibility to be obtained, which is excellent in fluidity, charging stability, and charging uniformity, even for long-term use, and also enabling an image whose fogging, ghost, and scattering are suppressed to be obtained. The magnetic toner has at least a binder resin and a magnetic material, where, the magnetic material is an magnetic iron oxide whose dielectric breakdown voltage of the magnetic material is 160 to 1600 V/cm, and the dielectric loss tangent (tan ?) of the magnetic toner at 100 kHz and 40° C. is 2.0×10?3 to 1.0×10?2.Type: ApplicationFiled: April 25, 2007Publication date: July 23, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Junko Hirata, Yoshihiro Ogawa, Yusuke Hasegawa, Kouji Nishikawa, Miho Okazaki, Takashige Kasuya
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Patent number: 7550241Abstract: The present invention relates to a magnetic mono-component toner composition with positive charge comprising i) a magnetic toner particle containing a charge control agent with positive charge; ii) a hydrophobic silica with negative charge; iii) a fluorinated organic fine powder; and iv) a metal oxide fine powder containing 20 to 80 wt % of tin oxide. The toner has an advantageous in the extended life of the drum, reduction of the background contamination, and improvement of long-term reliability, and thus can be used effectively for image forming apparatus.Type: GrantFiled: February 4, 2005Date of Patent: June 23, 2009Assignee: LG Chem Ltd.Inventors: Won-Sup Lee, Chang-Soon Lee, Joo-Yong Park, Hyeung-Jin Lee
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Publication number: 20080038653Abstract: An electrophotographic developer comprising a toner and a carrier is disclosed. The toner contains a toner binder resin, a colorant and a releasing agent, and a carrier contains a magnetic particles dispersed in a carrier binder resin, wherein the releasing agent contained in toner is composed of from 40 to 98% by weight of a first releasing agent component of an ester compound and 60 to 2% by weight of a second releasing agent component of a hydrocarbon compound having a branched-chain structure, and the carrier has a shape coefficient SF-1 of from 1.0 to 1.2 and a shape coefficient S-2 of from 1.1 to 2.5, and a volume based median diameter of from 10 to 100 ?m.Type: ApplicationFiled: July 20, 2007Publication date: February 14, 2008Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Hiroshi YAMAZAKI, Shingo FUJIMOTO, Ken OHMURA, Takao YAMANOUCHI
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Patent number: 6376146Abstract: Added to magnetic toner particles are 0.5 to 5% by weight based on the total weight of the toner particles of a magnetic powder and 0.01 to 0.5% by weight based on the total weight of the toner particles of stearate particles having an average particle diameter of 1 &mgr;m to 5 &mgr;m.Type: GrantFiled: June 23, 2000Date of Patent: April 23, 2002Assignee: Toshiba Tec Kabushiki KaishaInventor: Osamu Ieda
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Patent number: 6355194Abstract: A process for the preparation of microsynthetic carrier comprising the melting of a mixture of binder resin, magnetic component, colorant and optionally charge control additive, thereby forming a polymer melt, and mixing said mixture in a melt mixing device, cooling and pelletizing said mixture, and thereafter grinding and classifying said pellets.Type: GrantFiled: March 22, 1999Date of Patent: March 12, 2002Assignee: Xerox CorporationInventors: Enno E. Agur, Hadi K. Mahabadi, Sheau V. Kao, Gerald R. Allison, John A. Creatura
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Patent number: 6338928Abstract: A negative conductive silica and an inorganic oxide are added to a negative magnetic toner so as to obtain a developing agent satisfactory in the rise of the charging and in the stability of charging over the entire life of the developing agent and capable of forming an image free from blurring and a defective transference.Type: GrantFiled: August 30, 2000Date of Patent: January 15, 2002Assignee: Toshiba Tec Kabushiki KaishaInventor: Nobuo Tohata