By Polymerization Patents (Class 430/137.15)
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Publication number: 20040175640Abstract: The invention provides an electrostatic charge image developing toner containing a fixing resin and a wax, characterized in that in a DSC curve measured by a differential scanning calorimeter for the wax, a maximum endothermic peak of endothermic peaks at temperature up is less than 70° C., on-set temperature attributable to the maximum endothermic peak is above 50° C., and lowest on-set temperature of on-set temperatures attributable to endothermic peaks except the maximum endothermic peak is in a range of from 30° C. to 40° C.Type: ApplicationFiled: March 1, 2004Publication date: September 9, 2004Applicant: Hitachi Printing Solutions, Ltd.Inventors: Tsuneaki Kawanishi, Junji Kobayashi, Ryuuichi Shimizu, Shigenori Yaguchi, Hirobumi Ouchi
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Patent number: 6787280Abstract: A toner for developing an electrostatic image, comprising toner particles each containing at least a colorant and a resin, and an external additive present on each of the toner particles, wherein the water wettability of said toner particles without the external additive is W0, wherein the water wettability of the toner is W100, and wherein (W100−W0)/W100 is not greater than 0.3.Type: GrantFiled: November 4, 2002Date of Patent: September 7, 2004Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Yamashita, Tsunemi Sugiyama, Shinichiro Yagi, Hiroshi Yamada, Masami Tomita, Toshiki Nanya, Shigeru Emoto, Naohiro Watanabe, Tadao Takigawa
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Patent number: 6770411Abstract: A toner including a binder resin, a colorant, and a product of an iron compound containing an aromatic hydroxylcarboxylic acid as a ligand and represented by the formula (I) described in the specification, wherein the product has such a characteristic that a filtrate obtained by filtering a dispersion of 10 g of the product dispersed in 200 ml of purified water provides an electric conductivity of not greater than 600 &mgr;S/cm.Type: GrantFiled: March 28, 2002Date of Patent: August 3, 2004Assignee: Ricoh Company, Ltd.Inventors: Minoru Masuda, Satoshi Mochizuki, Yasuo Asahina, Kazuhiko Umemura, Hideki Sugiura, Kohsuke Suzuki, Tomomi Tamura
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Publication number: 20040146795Abstract: A toner is used in an image forming process employing a toner recycling system and contains at least a modified polyester resin, a coloring agent, and a releasing agent. The toner has a volume-average particle diameter Dv, a number-average particle diameter Dn and a shape factor SF-1, wherein Dv is in a range from 4.0 &mgr;m to 6.0 &mgr;m, the ratio Dv/Dn of Dv to Dn is in a range from 1.00 to 1.30, and the shape factor SF-1 is in a range from 140 to 200.Type: ApplicationFiled: January 20, 2004Publication date: July 29, 2004Inventors: Shigeru Emoto, Toshiki Nanya, Naohito Shimota, Maiko Kondo, Shinichiro Yagi, Hiroto Higuchi, Fumihiro Sasaki, Takahiro Honda, Junichi Awamura
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Publication number: 20040142264Abstract: A toner including a thermoplastic resin; a colorant; a wax; and a crystalline polymer, wherein a DSC endothermic peak temperature of the wax or the crystalline polymer determined by subjecting the toner to a differential scanning calorimetric analysis is lower by not less than 2° C. than a DSC endothermic peak temperature thereof determined when only the wax or the crystalline polymer is subjected to the differential calorimetric analysis.Type: ApplicationFiled: November 13, 2003Publication date: July 22, 2004Inventors: Chiaki Tanaka, Naohiro Watanabe, Takeshi Takada
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Publication number: 20040131961Abstract: A toner composition including toner particles including a binder resin including a modified polyester resin, and a second resin having a weight average molecular weight of from 2,000 to 10,000; a colorant; a release agent; and a particulate material which is present at least a surface portion of the toner particles while embedded into the surface portion, wherein the binder resin has a glass transition temperature not lower than 35° C. and lower than 55° C., and wherein the particulate material has an average particle diameter of from 0.002 to 0.2 times that of the toner particles. A developer including the toner composition and a carrier having a layer thereon which includes at least an acrylic resin and a silicone resin, and a method for fixing an image of the toner composition are also provided.Type: ApplicationFiled: September 26, 2003Publication date: July 8, 2004Applicant: RICOH COMPANY LIMITEDInventors: Yohichiroh Watanabe, Masanori Suzuki, Tsunemi Sugiyama, Hiroshi Yamashita, Takuya Saito, Naohiro Watanabe, Masami Tomita, Shigeru Emoto, Shinichiro Yagi, Hiroshi Yamada, Toshiki Nanya, Tadao Takigawa
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Publication number: 20040121256Abstract: A color toner which gives a suitable image gloss and has an excellent color reproducibility, which has sufficient anti-offset properties even when a release oil is not coated on a fixing roller or is coated in only a small amount, and which has excellent transfer properties, durability, and charge stability relative to humidity is disclosed. Also, an image-forming apparatus using the color toner and a toner container filled with the color toner are disclosed. The color toner comprises a continuous phase of a resin containing a urea-modified polyester resin; and a modified resin dispersed in the continuous phase, wherein the modified resin contains a release polymer portion containing a release polymer; and a modified portion containing a plurality of vinyl monomer units, the modified portion having an average ester group concentration of 8% by weight to 30% by weight.Type: ApplicationFiled: August 26, 2003Publication date: June 24, 2004Inventors: Masanori Suzuki, Takuya Saito, Hiroshi Yamashita, Yohichiroh Watanabe, Takeshi Takada, Tsunemi Sugiyama, Satoshi Mochizuki, Yasuaki Iwamoto, Takayuki Koike
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Publication number: 20040110077Abstract: The present invention provides a silica fine particle capable of preventing a charging member or an image bearing member from being contaminated with toner when the toner contains the particle and also capable of providing the toner with a stable developing property. The silica fine particle of the present invention has been hydrophobic treated. Furthermore, the particle has a peak in a range of 0.04 &mgr;m to 1 &mgr;m and a peak in the range of 1 &mgr;m to 100 &mgr;m in a volume-basis particle diameter distribution. The particle has a frequency ratio of 10 to 80% for the particles with a particle diameter of 0.04 &mgr;m to 1 &mgr;m to a total of all the peaks, and the particles has the frequency ratio of less than 16% for the particles with a particle diameters of 20 &mgr;m to 2000 &mgr;m to the total of all the peaks.Type: ApplicationFiled: October 2, 2003Publication date: June 10, 2004Inventors: Shinya Yachi, Yushi Mikuriya, Katsuyuki Nonaka, Shuntaro Watanabe
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Publication number: 20040110081Abstract: Methods for producing a polymerized toners are provided, where, a dispersion including colored polymer particles obtained by polymerizing a polymerizable composition is treated stably in the process of reducing the remaining monomer, the resultant polymerized toners include a sufficiently low content of remaining monomer, and the resultant polymerized toners have excellent properties and are useful as developers for printing and copying. In the process of reducing the remaining monomer, the dispersion of the colored polymer particles is treated by stripping in the presence of a specific antifoaming agent.Type: ApplicationFiled: July 31, 2003Publication date: June 10, 2004Inventors: Katsutomo Tanaka, Makoto Watanabe, Keita Sensui
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Patent number: 6746809Abstract: A toner for development of electrostatic images which has a residual polymerizable monomer content lower than 70 ppm and is substantially spherical as demonstrated by the flowability of at least 55%, and a process for producing a toner reduced in residual polymerizable monomer content by subjecting a slurry containing polymer particles obtained by polymerization to a stripping treatment under reduced pressure.Type: GrantFiled: January 7, 2002Date of Patent: June 8, 2004Assignee: Nippon Zeon Co., Ltd.Inventors: Kazuhiro Sato, Takeo Fujino
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Patent number: 6740460Abstract: A dry toner for developing an electrostatic image, including a toner binder containing a urea-modified polyester. The toner has a volume average particle diameter Dv of 3 to 10 &mgr;m and a number average particle diameter Dp such that the ratio Dv/Dp of the volume average particle diameter to the number average particle diameter ranges from 1.05 to 1.25.Type: GrantFiled: September 17, 2002Date of Patent: May 25, 2004Assignee: Ricoh Company, Ltd.Inventors: Masami Tomita, Shigeru Emoto, Hiroshi Yamasita, Tsunemi Sugiyama
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Publication number: 20040096767Abstract: In a process for producing toner particles by pre-dispersing at least a colorant and/or a release agent in a first dispersion medium to prepare a first fluid mixture, preparing a second fluid mixture from the first fluid mixture by means of a fine-dispersion machine, and forming toner particles from the second fluid mixture;Type: ApplicationFiled: November 7, 2003Publication date: May 20, 2004Inventors: Yoshinori Tsuji, Hidekazu Fumita
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Publication number: 20040072089Abstract: A toner containing a binder resin, a colorant, a charge control agent, and a thiazolyl disulfide compound or a thiuram disulfide compound. A process for producing a toner comprising polymerization of a polymerizable monomer composition that contains a polymerizable monomer and a colorant in an aqueous medium in the presence of a compound selected from a group consisting of (1) a thiazol thio compound, (2) a thiuram compound and (3) a dithiocarbamate compound.Type: ApplicationFiled: September 25, 2003Publication date: April 15, 2004Inventors: Takuji Kishimoto, Rieko Takahara
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Publication number: 20040072092Abstract: A toner for developing a static image is disclosed. The toner has carboxyl group in an amount of from 0.1×10−5 to 2.0×10−5 moles/g in a condition that the toner particle is dispersed in water, and an amount of a metal element contained in the toner is from 10 to 5,000 ppm by weight based on the toner.Type: ApplicationFiled: May 23, 2003Publication date: April 15, 2004Inventors: Asao Matsushima, Hiroyuki Kozuru, Tomoe Kitani, Tomoko Tanma
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Publication number: 20040067429Abstract: The present invention relates to an electrostatic-latent-image developing toner which contains at least a binder resin, a coloring agent and a wax that does not exhibit a clear peak on a low-temperature side of a main fusing peak in a DSC curve, the wax being represented by the formula;Type: ApplicationFiled: January 29, 2003Publication date: April 8, 2004Applicant: Minolta Co., Ltd.Inventors: Hideaki Ueda, Shino Hirao, Masahiro Anno
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Publication number: 20040053155Abstract: Disclosed is an electrophotographic toner using a polyester resin as a binder and a highly dispersed pigment colorant. The toner gives a high quality image excellent in transparency and chroma (brightness, gloss) and exhibits excellent powder fluidity, anti-offset property, charge stability and transferability.Type: ApplicationFiled: July 7, 2003Publication date: March 18, 2004Inventors: Shigeru Emoto, Masami Tomita, Hiroshi Yamashita, Tsunemi Sugiyama
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Publication number: 20040048184Abstract: A method of manufacturing polymer particles for use in a toner capable of incorporating fine wax particle in a polymer resin particle also in a case of adopting a dispersion polymerization method used generally so far, thereby enabling to prevent offset in a heat fixing device provided to copying machines or printers thereby improving the fixing property of the toner and capable of forming images at fine fineness when the polymer resin particles are used as the toner. The fine wax particle is dispersed by using the polymeric dispersant into an organic solvent and one or more of monomers for forming the polymer is dissolved and the polymerizing reaction of the monomer is proceeded while depositing the fine polymer particles on the surface of the fine wax particle upon deposition of the polymer into the organic solvent in the initial stage of the polymerizing reaction of the monomer, thereby incorporating the fine wax particles into the formed polymer particle.Type: ApplicationFiled: June 26, 2003Publication date: March 11, 2004Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventors: Naomichi Kobayashi, Masato Tanaka
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Patent number: 6689525Abstract: A dispersing agent for a pigment, comprising a specific compound having a structure wherein a phthalocyanine type molecular skeleton which is adsorptive on the pigment and an oligomer unit or polymer unit which prevents re-agglomeration of the pigment to bring out the effect of dispersion are covalently bonded, and having affinity for a medium or a solvent. Also disclosed are a pigment-dispersion composition containing the dispersing agent, a toner prepared using a pigment having been treated with the dispersing agent, and a process for producing such a toner.Type: GrantFiled: February 6, 2002Date of Patent: February 10, 2004Assignee: Canon Kabushiki KaishaInventor: Hitoshi Itabashi
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Publication number: 20030232269Abstract: A process for producing toner particles, in which toner particles are produced by polymerizing a polymerizable monomer composition containing at least a polymerizable monomer in an aqueous medium in a vessel, is provided. In this process, a resin composition containing a THF-insoluble resin component, which is a resin component generated in the process for producing toner particles, is kneaded. Then, the kneaded material and the polymerizable monomer are mixed together, and the resulting polymerizable monomer is polymerized to produce toner particles. For the resin composition, toner particles different from those having desired property, deposits on the vessel where the polymerization reaction occurred, or the like is used.Type: ApplicationFiled: April 24, 2003Publication date: December 18, 2003Inventors: Takeshi Tsujino, Hitosi Kanda, Ryoichi Fujita, Yoshinori Tsuji
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Publication number: 20030224276Abstract: To provide a process for producing toner particles in a good efficiency which have less residue of monomers and less other organic volatile components, the process has a polymerization step of polymerizing a polymerizable monomer composition containing at least a polymerizable monomer, in a vessel holding therein an aqueous medium, wherein a high-temperature saturated steam with a temperature higher than 100° C. is introduced into the aqueous medium held in the vessel, at the latter half of polymerization or after the polymerization has been completed, to remove at least organic volatile components from toner particles having at least a binder resin and a colorant.Type: ApplicationFiled: January 24, 2003Publication date: December 4, 2003Inventors: Yoshinori Tsuji, Toshiyuki Ugai, Akira Hashimoto, Hidekazu Fumita
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Publication number: 20030203300Abstract: An electrostatic image developing toner is disclosed. The toner is composed of a colored particle containing a compound represented by Formula (1).Type: ApplicationFiled: April 3, 2003Publication date: October 30, 2003Inventors: Tomoe Kitani, Hiroshi Yamazaki, Ken Ohmura
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Publication number: 20030186150Abstract: A toner for developing a static latent image is disclosed.Type: ApplicationFiled: March 4, 2003Publication date: October 2, 2003Applicant: Konica CorporationInventors: Ryuji Kitani, Asao Matsushima, Tomoe Kitani
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Publication number: 20030180644Abstract: A toner for developing an electrostatic image, including a colorant, a binder resin comprising a modified polyester, and fine resin particles having a weight average particle diameter of 50 to 300 nm and being present on an outer surface of the toner, wherein the toner has a BET specific surface area of 1.5 to 4.0 m2/g.Type: ApplicationFiled: March 24, 2003Publication date: September 25, 2003Inventors: Toshiki Nanya, Masami Tomita, Shigeru Emoto, Hiroshi Yamada, Shinichiro Yagi, Naohiro Watanabe, Tadao Takigawa
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Publication number: 20030180641Abstract: A toner for developing an electrostatic latent image is provided that can prevent occurrence of blister even with coated paper having a coated surface, exhibits excellent releasing performance in oilless fixing, and realizes both high glossiness and OHP transparency for an image to be formed. A process for producing the toner, a developer containing the toner, and a process for forming an image using the toner are also provided. The toner for developing an electrostatic latent image contains a binder resin, a releasing agent and a colorant, in which the binder resin has a number average molecular weight (Mn) in a range of from 9,000 to 18,000 and a molecular weight distribution represented by a ratio (Mw/Mn) of a weight average molecular weight (Mw) and a number average molecular weight (Mn) of 2.5 or less, and the binder resin contains a vinyl resin.Type: ApplicationFiled: August 16, 2002Publication date: September 25, 2003Applicant: FUJI XEROX CO., LTD.Inventors: Tomohito Nakajima, Satoshi Yoshida, Hidekazu Yaguchi, Takahisa Fujii, Yasuo Matsumura
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Publication number: 20030181551Abstract: It is an object of the present invention to provide a dispersing agent for a pigment capable of finely dispersing a pigment in a dispersion medium. The present invention provides a dispersing agent for a pigment comprising at least a metallic compound having a specific structure with a central metal capable of taking a penta-coordinated structure, and n-electron-donating compound having affinity for the dispersion medium and capable of being coordinated with the central metal of the metallic compound.Type: ApplicationFiled: January 10, 2003Publication date: September 25, 2003Inventors: Norikazu Fujimoto, Hitoshi Itabashi
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Publication number: 20030175610Abstract: An electrostatic image developing toner comprising a resin and a colorant is disclosed. The resin comprises a polymerization component of a polymerizable monomer having a polar group in an amount of 1.0 to 10.0 percent by weight, and a polymerization component of a polyfunctional polymerizable monomer in an amount of 0.1 to 10.0 percent by weight; ratio (A/B) is from 0.5 to 20.0 percent; and either a peak or a shoulder is positioned in the molecular weight region of 5,000 to 20,000, wherein A is an area of a chromatograph curve in the molecular weight region of 60,000 to 1,000,000, based on GCP measurement of a THF soluble component of toner and B is an entire area of the chromatograph curve.Type: ApplicationFiled: December 2, 2002Publication date: September 18, 2003Inventors: Tomoe Kitani, Takao Yamanouchi, Naohiro Hirose, Ken Ohmura
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Publication number: 20030170557Abstract: A non-magnetic mono-component toner of the present invention comprises, at least, a plurality of mother particles and a plurality of CCA particles adhering to the mother particles. The non-magnetic mono-component toner satisfies a×d<2.5, wherein “a” is the inclination of an approximation straight line of the CCA particles adhering to the mother particles, obtained by approximating distribution of particle diameter of the CCA particles relative to the particle diameter of the mother particles by the least-square method, and “d” (&mgr;m) is the volume-based mean particle diameter of the toner. Therefore, the charge on one particle of the non-magnetic mono-component toner can be efficiently reduced, thereby allowing lower developing voltage and achieving reduction in developing hysteresis.Type: ApplicationFiled: February 24, 2003Publication date: September 11, 2003Applicant: SEIKO EPSON CORPORATIONInventor: Hiroshi Toyama
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Publication number: 20030162112Abstract: A toner for developing an electrostatic image, comprising toner particles each containing at least a colorant and a resin, and an external additive present on each of the toner particles, wherein the water wettability of said toner particles without the external additive is W0, wherein the water wettability of the toner is W100, and wherein (W100−W0)/W100 is not greater than 0.3.Type: ApplicationFiled: November 4, 2002Publication date: August 28, 2003Inventors: Hiroshi Yamashita, Tsunemi Sugiyama, Shinichiro Yagi, Hiroshi Yamada, Masami Tomita, Toshiki Nanya, Shigeru Emoto, Naohiro Watanabe, Tadao Takigawa
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Publication number: 20030134220Abstract: A toner composition including toner particles including mother toner particles, which include a binder resin, a colorant and a release agent, and a charge controlling agent which is located on a surface of the mother toner particles and fixed thereon, wherein the toner particles have a spherical degree of from 0.960 to 1.000 and a specific surface area of from 0.70 to 2.5 m2/g. The toner composition optionally includes an external additive which is present on the surface of the toner particles.Type: ApplicationFiled: September 19, 2002Publication date: July 17, 2003Inventors: Shigeru Emoto, Hiroshi Yamashita, Naohiro Watanabe, Tsunemi Sugiyama, Hiroshi Yamada, Masami Tomita
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Publication number: 20030113648Abstract: A dry toner for developing an electrostatic image, including a toner binder containing a urea-modified polyester. The toner has a volume average particle diameter Dv of 3 to 10 &mgr;m and a number average particle diameter Dp such that the ratio Dv/Dp of the volume average particle diameter to the number average particle diameter ranges from 1.05 to 1.25.Type: ApplicationFiled: September 17, 2002Publication date: June 19, 2003Inventors: Masami Tomita, Shigeru Emoto, Hiroshi Yamasita, Tsunemi Sugiyama
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Publication number: 20030073020Abstract: A toner production process comprising the step of polymerizing a polymerizable monomer in the presence of (i) base particles containing at least a binder resin and (ii) a polymerization initiator. The polymerization initiator has in one molecule a hydrophilic moiety and a hydrophobic moiety and a reactive moiety between them, and the base particles are enlarged and/or surface-modified upon polymerization of the polymerizable monomer. Also disclosed is a toner having a circularity of from 0.92 to 1.0, which is produced by this process.Type: ApplicationFiled: May 23, 2002Publication date: April 17, 2003Inventors: Yasukazu Ayaki, Hitoshi Itabashi, Yayoi Tazawa
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Publication number: 20030044707Abstract: A dispersing agent for a pigment, comprising a specific compound having a structure wherein a phthalocyanine type molecular skeleton which is adsorptive on the pigment and an oligomer unit or polymer unit which prevents re-agglomeration of the pigment to bring out the effect of dispersion are covalently bonded, and having affinity for a medium or a solvent. Also disclosed are a pigment-dispersion composition containing the dispersing agent, a toner prepared using a pigment having been treated with the dispersing agent, and a process for producing such a toner.Type: ApplicationFiled: February 6, 2002Publication date: March 6, 2003Inventor: Hitoshi Itabashi
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Publication number: 20030022082Abstract: The present invention relates to a toner for developing a static latent image, wherein a smell of the toner has a cos&thgr; of from 0.990 to 0.998 as to the smell of styrene and a cos&thgr; of from 0.986 to 0.994 as to the smell of n-butyl acrylate in the smell space formed by styrene and n-butyl acrylate, and a toner for developing a static latent image, wherein a smell of the toner has a cos &thgr; of from 0.990 to 0.998 as to the smell of styrene and a cos &thgr; of from 0.991 to 0.999 as to the smell of mercaptocarboxylic acid ester in the smell space formed by styrene and mercaptocarboxylic acid ester.Type: ApplicationFiled: June 5, 2002Publication date: January 30, 2003Inventors: Ken Ohmura, Naohiro Hirose, Hiroshi Yamazaki
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Patent number: 6506529Abstract: A toner for developing an electrostatic latent image comprising a resin, a colorant and a releasing agent is disclosed. The releasing agent comprises a mixture of a plurality of compounds represented by formula (1) having difference carbon number of carbon atoms in R2 R1—(OCO—R2)n (1) wherein n represents an integer of 1 to 8 carbon atoms which may has a substituent, R1 is a hydrocarbon group having from 1 to 40, R2 is a hydrocarbon group having from 8 to 40 carbon atoms which may has a substituent.Type: GrantFiled: September 17, 2001Date of Patent: January 14, 2003Assignee: Konica CorporationInventors: Masafumi Uchida, Hiroshi Yamazaki, Meizo Shirose, Hajime Tadokoro, Ken Ohmura
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Patent number: 6500593Abstract: In a toner containing at least a binder resin, a pigment and a pigment dispersant, the pigment dispersant has a structure wherein a quinacridone molecular skeleton which is readily adsorptive on the colorant pigment and an oligomer or polymer which has good affinity for the solvent and for the resin serving as a toner binder are covalently bonded. Also disclosed is a process for producing the toner.Type: GrantFiled: November 29, 2001Date of Patent: December 31, 2002Assignee: Canon Kabushiki KaishaInventors: Koji Abe, Hitoshi Itabashi
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Patent number: 6495648Abstract: Toner binder resins with low odor and excellent charging stability as toners, containing styrene-acrylic copolymers or mixtures thereof, wherein the total content of volatile components is no greater than about 1,500 ppm, the content of volatile components with benzene rings is no greater than about 1,400 ppm, and the content of volatile components with benzene rings and boiling point of below about 200° C. is no greater than about 500 ppm.Type: GrantFiled: April 28, 2000Date of Patent: December 17, 2002Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Motoshi Inagaki, Koji Shimizu, Yoko Harada, Junya Nakamura
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Patent number: 6458502Abstract: A process for producing a polymerization toner, which comprises preparing a polymerizable-monomer composition which contains at least a polymerizable monomer and a colorant and does not contain any polymerization initiator, i) introducing the polymerizable-monomer composition into an aqueous medium to effect granulation, adding a polymerization initiator to the aqueous medium in the course of the granulation or after the granulation has been completed, or ii) adding a polymerization initiator in an aqueous medium, introducing the polymerizable-monomer composition into the aqueous medium to effect granulation, and then polymerizing the polymerizable-monomer composition having been granulated, to produce toner particles. In the process, the polymerization initiator is added in a specific time and a specific manner.Type: GrantFiled: June 7, 2001Date of Patent: October 1, 2002Assignee: Canon Kabushiki KaishaInventors: Tatsuya Nakamura, Hiroaki Kawakami, Koji Inaba, Yuji Moriki, Satoshi Handa, Katsuyuki Nonaka
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Patent number: 6455219Abstract: A process for making silica-containing latex particles involves polymerizing monomer in an emulsion comprising the monomer, water, silica particles, and optionally at least one surfactant, by adding at least one free radical initiator to the emulsion to form the silica-containing latex particles. In a preferred method, semicontinuous polymerization employing a seed latex is used to form the latex resin. The process achieves a silica-containing latex in which the silica is chemically incorporated therein that is ideally suited for use in the manufacture of toner and developer for xerographic use.Type: GrantFiled: June 22, 2001Date of Patent: September 24, 2002Assignee: Xerox CorporationInventors: Allan K. Chen, Tie Hwee Ng, Arthur Helbrecht, Kimberly D. Nosella, Danielle C. Boils-Boissier, Paul J. Gerroir, Rosa M. Duque
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Patent number: 6432605Abstract: A process for preparing a dispersion polymerized color toner for developing latent electrostatic images includes polymerization of a macromer in a liquid organic medium in which the macromer or the resulting polymer resin is not soluble. The liquid organic medium comprises a polymeric dispersion stabilizer. A macromer mixture comprising macromer, a colorant and a charge control agent may be polymerized in the dispersed state to produce the toner. Alternatively, the macromer is polymerized in the dispersed state to produce a particulate polymer resin. The particulate polymer resin formed is a functionalized resin having sites suitable for interacting with functionalized dyes that have complementary functionality. The functionalized dye is then applied to the resin particles typically with a dyeing aid, or surfactant. Toners produced by the inventive processes are substantially free of contamination by the liquid organic medium used during dispersion polymerization and/or dispersion dyeing.Type: GrantFiled: December 31, 2001Date of Patent: August 13, 2002Assignee: MatSci Solutions, Inc.Inventor: Hyun-Nam Yoon
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Publication number: 20020102485Abstract: In a toner containing at least a binder resin, a pigment and a pigment dispersant, the pigment dispersant has a structure wherein a quinacridone molecular skeleton which is readily adsorptive on the colorant pigment and an oligomer or polymer which has good affinity for the solvent and for the resin serving as a toner binder are covalently bonded. Also disclosed is a process for producing the toner.Type: ApplicationFiled: November 29, 2001Publication date: August 1, 2002Inventors: Koji Abe, Hitoshi Itabashi
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Patent number: 6403273Abstract: Toner particulates comprise a styrene/acrylic copolymer having a first aliphatic hydrocarbon wax incorporated therein during polyermization of the copolymer, and a second aliphatic hydrocarbon wax mixed with the copolymer.Type: GrantFiled: February 9, 2001Date of Patent: June 11, 2002Assignee: Lexmark International, Inc.Inventors: Vincent Wen-Hwa Ting, Michael Thomas Moore
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Patent number: 6383700Abstract: In an electrostatic image forming method, said electrophotographic photoreceptor comprises a resinous layer comprising siloxane base resin containing a structural unit having charge transport performance and a cross-linked structure on an electrically conductive support, and developer material comprises a toner which is obtained by suspension-polymerizing a polymerizable composition comprised of at least polymerizing monomer and colorant or a toner which is obtained by fusing at least said resin particles in an aqueous medium.Type: GrantFiled: October 13, 2000Date of Patent: May 7, 2002Assignee: Konica CorporationInventors: Hiroshi Yamazaki, Hiroyuki Yamada, Meizo Shirose, Shigenori Kouno, Akihiko Itami
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Patent number: 6383702Abstract: A dry toner of polymerization type for electronic photography for forming an image on a recordable medium is synthesized during a polymerization process by adding a hydrophobic silica system compound having both hydrophobic groups and hydrophilic groups and having the following chemical structure formula: the silica system compound being a stabilizer in a polymerization composition.Type: GrantFiled: October 13, 2000Date of Patent: May 7, 2002Assignee: Samsung Electronics Co., Ltd.Inventors: Seung-Min Ryu, Seung-Soon Jang, Soon-Nam Kim, Jong-Moon Eun, Hee-Won Jung, Moon-Soo Park, Soon-Gil Hong
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Patent number: 6365318Abstract: Disclosed is a process which comprises (a) dispersing into a solvent (i) toner particles comprising a resin and an optional colorant, and (ii) monomers selected from pyrroles, thiophenes, or mixtures thereof; and (b) causing, by exposure of the monomers to an oxidant, oxidative polymerization of the monomers onto the toner particles, wherein subsequent to polymerization, the toner particles are capable of being charged to a negative or positive polarity, and wherein the polarity is determined by the oxidant selected.Type: GrantFiled: November 28, 2000Date of Patent: April 2, 2002Assignee: Xerox CorporationInventors: Karen A. Moffat, Maria N. V. McDougall, James R. Combes
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Publication number: 20020034703Abstract: A toner for developing electrostatic latent image is disclosed. The toner comprise of particles having a volume average particle diameter of from 3 to 8 &mgr;m, and said resin is obtained by either emulsion polymerization, mini-emulsion polymerization employing or suspension polymerization employing thioglycerin or at least one compound selected from compounds represented by the Formula (1) as the chain transfer agent.Type: ApplicationFiled: July 17, 2001Publication date: March 21, 2002Inventors: Hiroshi Yamazaki, Kenji Yamane, Hiroyuki Kozuru, Kenji Hayashi, Mikio Kohyama
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Patent number: 6355392Abstract: A process for preparing a dispersion polymerized color toner for developing latent electrostatic images includes polymerization of a macromer in a liquid organic medium in which the macromer or the resulting polymer resin is not soluble. The liquid organic medium comprises a polymeric dispersion stabilizer. A macromer mixture comprising macromer, a colorant and a charge control agent may be polymerized in the dispersed state to produce the toner. Alternatively, the macromer is polymerized in the dispersed state to produce a particulate polymer resin. The particulate polymer resin formed is a functionalized resin having sites suitable for interacting with functionalized dyes that have complementary functionality. The functionalized dye is then applied to the resin particles typically with a dyeing aid, or surfactant. Toners produced by the inventive processes are substantially free of contamination by the liquid organic medium used during dispersion polymerization and/or dispersion dyeing.Type: GrantFiled: August 7, 2000Date of Patent: March 12, 2002Assignee: MatSci Solutions, Inc.Inventor: Hyun-Nam Yoon
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Patent number: 6342328Abstract: A toner for development of electrostatic images, comprising at least a binder resin, a colorant and a charge control agent, wherein the charge control agent is a polar resin composed of a copolymer of a vinyl monomer and SO3X (X=H or alkali metal) group-containing (meth)acrylamide and having an SO3X group-containing (meth)acrylamide unit content of 0.1 to 10 wt. % and a weight average molecular weight of 17,000 to 25,000, and a production process of the toner.Type: GrantFiled: September 5, 2000Date of Patent: January 29, 2002Assignee: Nippon Zeon Co., Ltd.Inventors: Takahiro Takasaki, Kazu Niwa, Kojiro Masuo, Kazuhiro Sato