Azo Containing Adjuvant Patents (Class 430/108.23)
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Patent number: 6656653Abstract: A toner is provided for the development of an electrostatic image which includes an agglomerate of particles obtained by agglomerating at least primary polymer particles and primary colorant particles, wherein the toner has a THF insoluble content of from 15% to 80% and the toner further includes a wax having a melting point of 30 to 100° C., and the method for producing the same.Type: GrantFiled: December 15, 2000Date of Patent: December 2, 2003Assignee: Mitsubishi Chemical CorporationInventors: Kazuo Mitsuhashi, Osamu Ando, Noriaki Takahashi, Tomoko Ishikawa, Yuqing Xu
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Publication number: 20030207186Abstract: A yellow toner in which, in a spectral-distribution diagram in which the reflectance (%) is plotted as ordinate and the wavelength (nm) as abscissa, the reflectance determined for a toner in a state of powder ranges from 15% to 20% at a wavelength of 500 nm and ranges from 75% to 80% at a wavelength of 600 nm, a cyan toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 30% to 35% at a wavelength of 450 nm and ranges from 35% to 40% at a wavelength of 475 nm, and a magenta toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 5% to 10% at a wavelength of 425 nm and ranges from 65% to 70% at a wavelength of 675 nm. These color toners each contain corresponding pigments in specific combination, and promise color reproduction which can ensure the color tones of process inks.Type: ApplicationFiled: January 17, 2003Publication date: November 6, 2003Inventors: Takayuki Itakura, Takaaki Kotaki, Takaaki Kaya, Kazuhiko Hayami, Nozomu Komatsu
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Patent number: 6641969Abstract: A magnetic toner with a negative polarity for developing latent electrostatic images is made of toner particles, each toner particle containing a binder resin, a magnetic powder, and a charge control agent, the surface of the magnetic toner satisfying the relationship of 2×10−7≦C/Sw≦10×10−7, provided C≦8×10−3, wherein C is an amount (g/g) of the charge control agent dissolved in a solvent comprising water and methanol, and Sw is a specific surface area (cm2/cm3) of the toner particles determined from a weight-average particle diameter of the toner particles. An image forming apparatus has an electrostatic image bearing member, and a unit for developing the electrostatic image with the above magnetic toner, the unit having a developer holding member provided with a magnet, and a developer container.Type: GrantFiled: September 20, 2002Date of Patent: November 4, 2003Assignee: Ricoh Company, Ltd.Inventors: Osamu Uchinokura, Tomio Kondou
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Publication number: 20030198882Abstract: The present invention provides a toner for electrostatic image development which employs a black colorant free from a toxic substance and exhibits stable charge behavior even after extended use or printing of a large number of sheets, thus making it possible to provide printed images having sufficient image density without causing toner dispersion, fogging, and variation in image density. This is a toner for electrostatic image development comprising a binder resin and a colorant, wherein the colorant is made of black fine particles obtained by coating the surface of titanium dioxide particles with a complex oxide of titanium and iron.Type: ApplicationFiled: February 25, 2003Publication date: October 23, 2003Applicant: DAINIPPON INK AND CHEMICALS, INC.Inventor: Hideki Gambayashi
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Patent number: 6635398Abstract: A dry toner has toner particles containing at least a binder resin, a colorant and a wax component and an external additive. The binder resin contains a component derived from a monomer selected from butadiene, isoprene and chloroprene. The toner has a main Tg from 40° C. to 70° C. When specific surface area measured by the BET method in an environment of 23° C. atmospheric temperature and 65% relative humidity is represented by A (m2/g) and specific surface area measured by the BET method in an environment of 50° C. atmospheric temperature and 3% relative humidity is represented by B (m2/g), the toner satisfies the following relationship: 0.8≦A≦4.0, 0.80≦(B/A)≦1.05. The toner has a circle-corresponding number-average particle diameter D1 from 2 to 10 &mgr;m, an average circularity from 0.950 to 0.995 and a circularity standard deviation less than 0.040. The toner has a main-peak molecular weight from 2,000 to 100,000 and contains a THF-insoluble matter from 5 to 60% by weight.Type: GrantFiled: October 25, 2000Date of Patent: October 21, 2003Assignee: Canon Kabushiki KaishaInventors: Keiji Komoto, Tsutomu Kukimoto, Tatsuhiko Chiba, Akira Hashimoto
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Publication number: 20030194628Abstract: A magenta toner for electrophotography includes a binder resin and a colorant, wherein the toner contains at least a naphthol pigment having a structure represented by the following general formula (1) as the colorant, and has a shape factor SF1 of 110 to 140 obtained by the equation below and a volume average particle size of 2 to 9 &mgr;m: 1Type: ApplicationFiled: August 16, 2002Publication date: October 16, 2003Applicant: FUJI XEROX CO., LTD.Inventors: Satoshi Yoshida, Yasuo Matsumura, Toyofumi Inoue, Hidekazu Yaguchi, Takahisa Fujii, Tomohito Nakajima
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Publication number: 20030190538Abstract: A color toner selected from the group consisting of a yellow toner, a magenta toner, and a cyan toner, and mixtures thereof, which includes a binder resin and a color pigment, wherein a C* value of a fixed red image formed by a combination of a layer of the yellow toner having a weight of 8 g/m2 and a layer of the magenta toner having a weight of 8 g/m2 is not less than 80, and wherein a hexagon formed by six points in a *-b* chromaticity coordinates of a fixed yellow image formed by a layer of the yellow toner having a weight of 8 g/m2, the fixed red image, a fixed magenta image formed by a layer of the magenta toner having a weight of 8 g/m2, a fixed blue image formed by a combination of a layer of the magenta toner having a weight of 8 g/m2 and a layer of the cyan toner having a weight of 8 g/m2, a fixed cyan image formed by a layer of the cyan toner having a weight of 8 g/m2, and a fixed green image formed by a combination of a layer of the cyan toner of 8 g/m2 and a layer of the yellow toner having a weiType: ApplicationFiled: November 25, 2002Publication date: October 9, 2003Applicant: RICOH COMPANY, LTD.Inventors: Shinichi Kuramoto, Kanjirou Kawasaki, Shohichi Sugimoto
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Publication number: 20030190544Abstract: A toner for electrophotography and the like that are excellent in color produceability, sublimination-resistance, and color reproduceability, and have no risk of fogging or printing defects of an image. The toner for electrophotography contains C.I. pigment Yellow 74 and C.I. pigment Yellow 180, in which the total content thereof is 7% by mass or less, the content of the C.I. pigment Yellow 74 is 5% by mass or less. A developer for electrophotography comprising the toner for electrophotography.Type: ApplicationFiled: October 8, 2002Publication date: October 9, 2003Applicant: FUJITSU LIMITEDInventors: Tomoaki Tanaka, Yasushige Nakamura
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Patent number: 6627368Abstract: A toner composition, comprising an organometal complex compound having the formula (1), which has an electroconductivity of at most 110 &mgr;S/cm when dispersed in ion-exchanged water in an amount of 1 wt %: wherein Ar is an aryl group selected from the group consisting of a substituted or unsubstituted phenyl group and a substituted or unsubstituted naphthyl group, X and Y are —S—, —O—, —CO—, —COO—, —NH— or —NR—, wherein R is C1-4 alkyl; K+ is hydrogen ion, lithium ion, sodium ion, potassium ion, ammonium ion, organoammonium or a mixture thereof; m is the number of azo compound groups coordinated to Fe and is 1, 2, 3 or 6; p is the valence of Fe; n is 1, 2 or 4; and q is 0 or an integer, as a component of an electrostatic image developing non-magnetic toner.Type: GrantFiled: December 6, 2000Date of Patent: September 30, 2003Assignee: Hodagaya Chemical Co., Ltd.Inventors: Masaki Okubo, Hiroshi Nanaumi, Masataka Sawano
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Patent number: 6613140Abstract: The present invention relates to a composition comprising at least one azo pigment of the formula optionally additional azo pigments and a surfactant, and from 0.1 to 50% by weight of a selected resin. The invention further relates to a process for its preparation, its use for the preparation of dispersions, paint systems, coating materials, color filters, inks, preferably printing inks, as well as color toners comprising the inventive pigment compositions, particularly preferable as liquid inks in the packaging industry, and liquid inks for the packaging industry.Type: GrantFiled: September 17, 2001Date of Patent: September 2, 2003Assignee: Ciba Specialty Chemicals CorporationInventors: Greig Chisholm, Sharon Kathleen Wilson
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Publication number: 20030162116Abstract: A toner contains at least a binder resin, a colorant, a compound (A) and a compound (B) in which the compound (A) is selected from the specific compound group and the compound (B) is a derivative of any one of the compounds included in the group from which the compound (A) is selected. The total content A of the compound (A) and compound (B) in the toner is from 0.2% to 6% by weight based on the weight of the toner, and where the content of the cross-linking agent component in the binder resin is represented by B % by weight based on the weight of the toner, the following relationship is satisfied: 0.1≦A/B≦70.Type: ApplicationFiled: January 13, 2003Publication date: August 28, 2003Inventors: Yasushi Katsuta, Manabu Ohno, Masanori Ito, Emi Tosaka
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Patent number: 6605403Abstract: A color toner is provided that enables printing of all colors, including black, either comprising one particle system that, depending on exposure to a particular wavelength, provides a desired color or comprising a plurality of layers, each of which provide a different color upon exposure to a different wavelength. The color toner comprises three layers, and, optionally, a base, or fixer, layer, each color layer containing separate color grain centers directed to a specific color, including color-sensitive silver halide (AgX) crystals, at least one developing agent, and color coupling chemistry. Advantageously, colors can be created or modified through the application of light (digital), as opposed to application of chemicals. Further, true black is obtainable with a single toner. Finally, image processing is mechanically and chemically simplified.Type: GrantFiled: November 14, 2001Date of Patent: August 12, 2003Assignee: Hewlett-Packard CompanyInventors: C. Troy Jensen, David M. Payne
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Patent number: 6593050Abstract: A flash fixing color toner for use in an image forming process includes a binder resin and a hue-altering coloring agent, wherein the hue-altering coloring agent alters, at a time of irradiation of flash light, an initial hue of the color toner into a secondary hue, so that the color toner is fixed to a recording medium by the irradiation of flash light, and a color image is substantially formed with the secondary hue of the color toner.Type: GrantFiled: May 31, 2001Date of Patent: July 15, 2003Assignee: Fuji Xerox, Co., Ltd.Inventors: Yoshimichi Katagiri, Yasushige Nakamura, Shinichi Yaoi
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Publication number: 20030091918Abstract: A magnetic toner with a negative polarity for developing latent electrostatic images is made of toner particles, each toner particle containing a binder resin, a magnetic powder, and a charge control agent, the surface of the magnetic toner satisfying the relationship of 2×10−7≦C/Sw≦10×10−7, provided C≦8×10−3, wherein C is an amount (g/g) of the charge control agent dissolved in a solvent comprising water and methanol, and Sw is a specific surface area (cm2/cm3) of the toner particles determined from a weight-average particle diameter of the toner particles. An image forming apparatus has an electrostatic image bearing member, and a unit for developing the electrostatic image with the above magnetic toner, the unit having a developer holding member provided with a magnet, and a developer container.Type: ApplicationFiled: September 20, 2002Publication date: May 15, 2003Inventors: Osamu Uchinokura, Tomio Kondou
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Publication number: 20030091919Abstract: A color toner is provided that enables printing of all colors, including black, either comprising one particle system that, depending on exposure to a particular wavelength, provides a desired color or comprising a plurality of layers, each of which provide a different color upon exposure to a different wavelength. The color toner comprises three layers, and, optionally, a base, or fixer, layer, each color layer containing separate color grain centers directed to a specific color, including color-sensitive silver halide (AgX) crystals, at least one developing agent, and color coupling chemistry. The optional base layer (or a separate layer associated with each color layer) is employed if chemical fixing, instead of electronic fixing, is required. If used, the fixer layer(s) comprise(s) fixing agents for fixing unexcited silver halide by saturating the unreacted silver halide with electrons and to terminate developer and color coupler reactions.Type: ApplicationFiled: November 14, 2001Publication date: May 15, 2003Inventors: C. Troy Jensen, David M. Payne
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Patent number: 6537716Abstract: A toner for developing electrostatic images is comprised of a binder resin and a wax. The binder resin contains as a primary component a polyester resin having a soft segment. The wax has, in its endothermic peaks at the time of temperature rise and exothermic peaks at the time of temperature drop in the DSC curve measured using a differential scanning calorimeter; (i) an endothermic onset temperature within the range of from 50° C. to 110° C.; (ii) at least one endothermic peak P1 within the range of from 70° C. to 130° C. at the time of temperature rise; and (iii) a maximum exothermic peak at the time of temperature drop, within the range of plus-minus 9° C. of the endothermic peak P1.Type: GrantFiled: December 4, 1996Date of Patent: March 25, 2003Assignee: Canon Kabushiki KaishaInventors: Shinji Doi, Hirohide Tanikawa, Hiroaki Kawakami, Masatsugu Fujiwara, Tsutomu Onuma
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Publication number: 20030027071Abstract: A coloring agent for use in toners which comprises coloring particles modified with a surface modifier having in one molecule a hydrophilic moiety, a hydrophobic moiety, and a reactive moiety between the hydrophilic moiety and the hydrophobic moiety. Also disclosed is a toner comprising toner particles containing at least a binder resin and a coloring agent comprising the above surface-modified coloring particles.Type: ApplicationFiled: May 21, 2002Publication date: February 6, 2003Inventors: Yayoi Tazawa, Yasukazu Ayaki
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Publication number: 20030022080Abstract: A toner including at least a binder resin; a colorant; and a charge controlling agent, in which the binder resin includes at least a polyester resin having a molecular weight distribution such that components having a molecular weight not greater than 500 are included in an amount of 4% by weight and at least a peak is present in a range of from 3,000 to 9,000 when measured by Gel Permeation Chromatography. In addition, the binder resin does not include a tetrahydrofuran-insoluble compound and the charge controlling agent is a resin charge controlling agent including at least units obtained from a monomer including a sulfonate group; an aromatic monomer including an electron absorption group; and an acrylic ester and/or a methacrylic ester monomer.Type: ApplicationFiled: April 3, 2002Publication date: January 30, 2003Inventors: Hiroyuki Fushimi, Toshiki Nanya, Osamu Uchinokura, Shinichiro Yagi, Kohki Katoh
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Publication number: 20030017405Abstract: A black toner comprising a resin binder; and a black colorant comprising a composite oxide of two or more metals and at least one of a blue dye or pigment and a green dye or pigment. The black toner can be suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: July 2, 2002Publication date: January 23, 2003Applicant: KAO CORPORATIONInventors: Jun Shimizu, Akihiro Eida
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Publication number: 20020192580Abstract: A color toner selected from the group consisting of a yellow toner, a magenta toner, and a cyan toner, and mixtures thereof, which includes a binder resin and a color pigment, wherein a C* value of a fixed red image formed by a combination of a layer of the yellow toner having a weight of 8 g/m2 and a layer of the magenta toner having a weight of 8 g/m2 is not less than 80, and wherein a hexagon formed by six points in a*-b* chromaticity coordinates of a fixed yellow image formed by a layer of the yellow toner having a weight of 8 g/m2, the fixed red image, a fixed magenta image formed by a layer of the magenta toner having a weight of 8 g/m2, a fixed blue image formed by a combination of a layer of the magenta toner having a weight of 8 g/m2 and a layer of the cyan toner having a weight of 8 g/m2, a fixed cyan image formed by a layer of the cyan toner having a weight of 8 g/m2, and a fixed green image formed by a combination of a layer of the cyan toner of 8 g/m2 and a layer of the yellow toner having a weigType: ApplicationFiled: November 5, 1999Publication date: December 19, 2002Inventors: SHINICHI KURAMOTO, KANJIROU KAWASAKI, SHOHICHI SUGIMOTO
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Patent number: 6485875Abstract: A toner is constituted by at least a binder resin, a colorant and a wax. The binder resin has been formed from monomers including a vinyl monomer and polyester-forming monomers containing at least a polybasic carboxylic acid having three or more carboxyl groups or its anhydride, and comprises at least a hybrid resin comprising a vinyl polymer unit and a polyester unit.Type: GrantFiled: October 26, 2000Date of Patent: November 26, 2002Assignee: Canon Kabushiki KaishaInventors: Yuki Karaki, Hiroshi Yusa, Takashige Kasuya, Yoshihiro Ogawa
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Publication number: 20020172880Abstract: A spherical dry color toner for electrostatic image development produces a clear image after printing and has an excellent color reproducibility in color overlapping during multi-color printing, and also yields an image having a transparency fixed on an OHP sheet and can achieve a clear color free from turbidity when projected on a screen.Type: ApplicationFiled: February 26, 2002Publication date: November 21, 2002Applicant: Dainippon Ink and Chemicals, Inc.Inventors: Hitoshi Takayanagi, Takashi Ito, Katsuyuki Ogura
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Patent number: 6479204Abstract: A magnetic toner with a negative polarity for developing latent electrostatic images is made of toner particles, each toner particle containing a binder resin, a magnetic powder, and a charge control agent, the surface of the magnetic toner satisfying the relationship of 2×10−7≦C/Sw≦10×10−7, provided C≦8×10−3, wherein C is an amount (g/g) of the charge control agent dissolved in a solvent comprising water and methanol, and Sw is a specific surface area (cm2/cm3) of the toner particles determined from a weight-average particle diameter of the toner particles. An image forming apparatus has an electrostatic image bearing member, and a unit for developing the electrostatic image with the above magnetic toner, the unit having a developer holding member provided with a magnet, and a developer container.Type: GrantFiled: June 2, 2000Date of Patent: November 12, 2002Assignee: Ricoh Company, Ltd.Inventors: Osamu Uchinokura, Tomio Kondou
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Patent number: 6465145Abstract: Disclosed is a yellow developing agent with improvements in resistance to the environment, the transparency, the resistance to offset, and the safety in the environment, comprising a binder resin containing mainly a copolymer resin of a norbornene derivative and an ethylene derivative, a natural wax, and a yellow coloring material containing mainly benzimidazolone pigment.Type: GrantFiled: June 8, 2001Date of Patent: October 15, 2002Assignee: Toshiba TEC Kabushiki KaishaInventor: Toshiaki Yamauchi
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Patent number: 6455215Abstract: An electrophotographic magenta toner which comprises a binder resin and a colorant comprising (a) 0.5 to 15 parts by weight of C.I. Pigment Red 57:1 and (b) 0.5 to 15 parts by weight of C.I. Pigment Red 81 or C.I. Pigment Red 122, per 100 parts by weight of the toner. A magenta developer comprising the magenta toner, and a full color image forming method using the magenta toner or developer are also disclosed.Type: GrantFiled: March 9, 1998Date of Patent: September 24, 2002Assignee: Fuji Xerox Co., Ltd.Inventors: Masaki Hashimoto, Masanori Ichimura, Michio Take, Hiroshi Takano
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Patent number: 6455216Abstract: A toner for developing electrostatic latent images comprises: a colorant; a polyester resin; a negative charge controlling agent comprised of a chromium complex compound; and a positive charge controlling agent, wherein the polyester resin has an acid value Z of 15 to 33 mgKOH/g, a hydroxyl value Y of 4 to 17 mgKOH/g and a number-average molecular weight (Mn) of 5200-7000.Type: GrantFiled: March 20, 2001Date of Patent: September 24, 2002Assignee: Sharp Kabushiki KaishaInventors: Hitoshi Nagahama, Toshihiko Murakami, Katsuaki Sumida
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Publication number: 20020110746Abstract: A toner for developing an electrostatic image is disclosed. The toner contains an amount of not less than 0.1% by weight of an element selected from elements of the Groups of 1B, 2B, 4B, 5B, 6B, 7B, 8, 3A and 4A of the fourth and fifth periodic of the long periodic table of the elements, and the isolation ratio of the element is not more than 10% by number.Type: ApplicationFiled: February 11, 2000Publication date: August 15, 2002Inventors: Tomomi Oshiba, Ken Ohmura, Shigenori Kouno, Hiroshi Yamazaki
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Publication number: 20020106571Abstract: A flash fixing color toner for use in an image forming process includes a binder resin and a hue-altering coloring agent, wherein the hue-altering coloring agent alters, at a time of irradiation of flash light, an initial hue of the color toner into a secondary hue, so that the color toner is fixed to a recording medium by the irradiation of flash light, and a color image is substantially formed with the secondary hue of the color toner.Type: ApplicationFiled: May 31, 2001Publication date: August 8, 2002Applicant: Fujitsu LimitedInventors: Yoshimichi Katagiri, Yasushige Nakamura, Shinichi Yaoi
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Patent number: 6426169Abstract: A toner having a stable chargeability in various environments, a stable fixability over a wide temperature range and a resistance to sticking on an image-bearing member, is formed of a binder resin, a colorant and an azo iron compound as a charge control agent. The azo iron compound is formed from a monoazo compound having at least one alkyl group and two hydroxyl groups capable of bonding with an iron atom. The toner has a tetrahydrofuran-soluble content providing a gel-permeation chromatogram showing at least one peak in a molecular weight region of 3×103 to 5×104 and at least one peak or shoulder in a molecular weight region of above 5×104 and at most 1×107.Type: GrantFiled: October 30, 2000Date of Patent: July 30, 2002Assignee: Canon Kabushiki KaishaInventors: Tsutomu Onuma, Hirohide Tanikawa, Nobuyuki Okubo, Yoshihiro Ogawa, Tsuneo Nakanishi, Katsuhisa Yamazaki, Kaori Hiratsuka
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Publication number: 20020098435Abstract: The present invention relates to the use of wax-coated pigment granules as colorants in electrophotographic toners and developers, powder coating materials, inkjet inks, electret fibers, and color filters, wherein the coated pigment granules have a particle size of between 0.05 and 5 mm and a wax content of from 1 to 50% by weight, based on the overall weight of the coated pigment granules.Type: ApplicationFiled: November 1, 2001Publication date: July 25, 2002Applicant: Clariant GmbHInventors: Ulrike Rohr, Ruediger Baur, Hans-Joachim Metz, Andreas Stohr
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Publication number: 20020058193Abstract: A color toner (magenta toner) showing not only color image forming performances such as color reproducibility, gradation characteristic, light-fastness, full-color image forming characteristic and a chargeability but also excellent in matching with various members of an electrophotographic apparatus is produced from a binder resin, a wax component and a specific monoazo pigment composition. The monoazo pigment composition is characterized by a principal monoazo pigment of a specific structure and specified amounts of a &bgr;-naphthol derivative and an aromatic amine, usable as materials for synthesizing the monoazo pigment.Type: ApplicationFiled: August 31, 2001Publication date: May 16, 2002Inventors: Emi Tosaka, Motoya Fukushima, Manabu Ohno, Yasushi Katsuta
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Publication number: 20020055053Abstract: A toner showing quick chargeability and stable chargeability in a high humidity environment is provided by a combination of a specific polyester binder resin and a specific azo iron compound. The polyester binder resin has an acid value (Av) of 0.5 to 30 mgKOH/g and a hydroxyl value (OHv) of 1 to 50 mgKOH/g giving a ratio (Av/OHv) therebetween satisfying: 0.05≦Av/OHv≦2.0. The azo iron compound is preferably an iron complex (salt) including as a ligand a mono-azo compound formed by diazo coupling between a 2-aminophenol (derivative) and an alkyl-substituted naphthol (derivative).Type: ApplicationFiled: September 6, 2001Publication date: May 9, 2002Inventors: Takashige Kasuya, Hirohide Tanikawa, Hiroshi Yusa, Yoshihiro Ogawa, Katsuhisa Yamazaki, Ryota Kashiwabara
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Patent number: 6372399Abstract: A developing agent comprising a toner particle containing a binder resin having an acid value of 1 to 30, a glass transition temperature of 40 to 65° C. and a softening point of 80 to 140° C., an azo-based iron complex, and a colorant and/or a first magnetic particle. This developing agent is suited for use in a fixing device of electromagnetic induction heating system.Type: GrantFiled: April 20, 2000Date of Patent: April 16, 2002Assignee: Toshiba Tec Kabushiki KaishaInventor: Shinya Tomura
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Publication number: 20020042012Abstract: A toner is provided for the development of an electrostatic image which includes an agglomerate of particles obtained by agglomerating at least primary polymer particles and primary colorant particles, wherein the toner has a THF insoluble contentof from 15% to 80% and the toner further includes a wax having a melting point of 30 to 100° C., and the method for producing the same.Type: ApplicationFiled: December 15, 2000Publication date: April 11, 2002Applicant: Mitsubishi Chemical CorporationInventors: Kazuo Mitsuhashi, Osamu Ando, Noriaki Takahashi, Tomoko Ishikawa, Yuqing Xu
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Patent number: 6365314Abstract: A toner for developing electrostatic images. having a uniform composition and uniform performances over varying sizes of toner particles is constituted by (a) a binder resin, (b) a long-chain alkyl compound and (c) a specific azo-type iron complex. The long-chain alkyl compound is represented by the following formula (1), (2) or (3): CH3&Parenopenst;CH2&Parenclosest;xCH2OH (1), CH3&Parenopenst;CH2&Parenclosest;yCH2COOH (3), wherein x and y independently denote an average value in the range of 35-150.Type: GrantFiled: December 9, 1999Date of Patent: April 2, 2002Assignee: Canon Kabushiki KaishaInventors: Koichi Tomiyama, Takaaki Kohtaki, Manabu Ohno, Makoto Unno, Yushi Mikuriya, Nobuyuki Okubo, Tadashi Doujo, Shunji Suzuki
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Publication number: 20020037466Abstract: A magenta toner containing at least a binder resin and a colorant; the magenta toner having a storage elastic modulus at a temperature of 80° C., G′80, in the range of from 1×106 dN/m2 to 1×108 dN/m2 and a storage elastic modulus at a temperature of from 120° C. to 180° C., G′120-180, in the range of from 2×103 dN/m2 to 1×106 dN/m2, and containing at least a compound selected from the group consisting of compounds represented by the following Formulas (1) and (2) and a compound represented by the following Formula (3).Type: ApplicationFiled: July 10, 2001Publication date: March 28, 2002Inventors: Makoto Kanbayashi, Takaaki Kotaki, Katsumi Kondo, Yasuhiro Ichikawa, Takaaki Kaya, Wakashi Iida, Takayuki Itakura
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Publication number: 20020028401Abstract: Iron azo complex compounds of the formula (I) are used as charge control agents in electrophotographic toners and developers, in powder coating materials, electret materials and in electrostatic separation processes, in inkjet inks and in color filters.Type: ApplicationFiled: June 28, 2001Publication date: March 7, 2002Applicant: Clariant GmbHInventors: Hans-Tobias Macholdt, Eduard Michel, Ruediger Baur, Dominique Pflieger, Bansi Lai Kaul
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Publication number: 20020006564Abstract: A method for forming a full color image including: forming at least yellow, magenta and cyan color toner images on a receiving material to form a full color image thereon; and fixing the full color image upon application of heat thereto while not contacting the full color image, wherein each of the yellow, magenta and cyan color toner images includes a binder resin and a pigment, wherein the yellow color toner includes a benzimidazolone pigment, the magenta color toner includes at least one of Naphthol Carmine F6B and a combination of Naphthol Carmine F6B and Naphthol Carmine FBB, and the cyan color toner includes &bgr; copper phthalocyanine, and wherein the yellow color toner image has a position closer to the receiving material than any other color toner image when two or more of the color toner images including the yellow color toner image are overlaid.Type: ApplicationFiled: April 30, 2001Publication date: January 17, 2002Applicant: Ricoh Company, Ltd.Inventors: Tomio Kondou, Shinichi Kuramoto, Hideki Sugiura
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Publication number: 20020004588Abstract: Monoazo metal complex compound containing composition, the incidence of skin sensitization in a skin sensitization potential test based on the maximization method of said composition being not more than 20% and method for producing said composition which comprises a step for removing impurity substances using an alcoholic organic solvent; charge control agent comprising said composition and toner containing said charge control agent; coloring agent containing said composition and colored thermoplastic resin composition containing said coloring agent.Type: ApplicationFiled: May 31, 2001Publication date: January 10, 2002Inventors: Akihiro Tada, Tohru Tsuruhara
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Publication number: 20010051309Abstract: A toner for developing electrostatic latent images comprises: a colorant; a polyester resin; a negative charge controlling agent comprised of a chromium complex compound; and a positive charge controlling agent, wherein the polyester resin has an acid value Z of 15 to 33 mgKOH/g, a hydroxyl value Y of 4 to 17 mgKOH/g and a number-average molecular weight (Mn) of 5200-7000.Type: ApplicationFiled: March 20, 2001Publication date: December 13, 2001Inventors: Hitoshi Nagahama, Toshihiko Murakami, Katsuaki Sumida
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Publication number: 20010023048Abstract: A toner for developing an electrostatic image excellent in fixing property and particularly in light transmissibility and coloring property and satisfying high image quality and high reliability, and a process for producing the same, as well as a developer for an electrostatic image and a process for forming an image are provided. The toner for developing an electrostatic image contains at least a resin component and colorant particles, and the colorant particles exhibit a dispersion state inside the toner observed by a transmission electron microscope. The dispersion state satisfies two conditions, where (1) the colorant particles have a dispersion average particle diameter of 100 nm or less, and (2) the colorant particles have a content of coarse particles of a diameter of 400 nm or more 5% by number or less of the total of the colorant particles.Type: ApplicationFiled: February 6, 2001Publication date: September 20, 2001Applicant: FUJI XEROX CO., LTD.Inventors: Takeshi Shoji, Shuji Sato, Takao Ishiyama, Manabu Serizawa, Masaaki Suwabe, Yasuo Matsumura
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Patent number: 6284422Abstract: A toner for developing electrostatic latent images comprises a polyester resin and an electric charge controlling agent containing a chromium complex compound, wherein the polyester resin has an acid value Z of 15 to 30 (15<Z≦30) mgKOH/g and a hydroxyl value Y of 4 to 17 (4≦Y≦17) mgKOH/g.Type: GrantFiled: April 25, 2000Date of Patent: September 4, 2001Assignee: Sharp Kabushiki KaishaInventors: Hitoshi Nagahama, Toshihiko Murakami, Katsuaki Sumida, Junichi Saito