Patents Examined by Roland Martin
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Patent number: 6096470Abstract: A process for fabricating an electrophotographic imaging member includingforming a charge generating layer,forming an undried charge transport layer coating by applying to the charge generating layer a solution selected from either or both the group consisting ofa solution including a charge transport molecule, a first film forming binder and at least a first solvent anda solution including a charge transporting polymer and at least a first solvent,forming an undried overcoat layer coating by applying to the undried charge transport layer coating an overcoat layer coating solution including a second film forming polymer and at least a second solvent, the charge transport molecule and first film forming polymer or either or both a charge transporting polymer being substantially insoluble in the second solvent and the second polymer being substantially insoluble in the first solvent,applying heat to both the undried charge transport layer coating and the undried overcoat layer coating to migrate the first solveType: GrantFiled: October 28, 1999Date of Patent: August 1, 2000Assignee: Xerox CorporationInventors: Timothy J. Fuller, Damodar M. Pai, John F. Yanus, Anthony T. Ward, Harold F. Hammond, Merlin E. Scharfe, Paul J. DeFeo
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Patent number: 6096468Abstract: A toner for use in development of electrostatic latent images is disclosed. The toner has toner particles containing a binder resin, a colorant, a wax and a compound of Formula (A): ##STR1## wherein R.sub.1 and R.sub.4 each represent a substituted or unsubstituted aromatic group, inclusive of a condensed ring; R.sub.2 and R.sub.3 each represent a hydrogen atom, an alkyl group, a substituted or unsubstituted aromatic group, inclusive of a condensed ring; M represents an element selected from B, Ti, Fe, Co, Cr, Al and Ni; and X.sup.n+ represents a cation. The toner has the shape factors SF-1 and SF-2 with the specified range. Further, disclosed are a process for producing the toner and an image forming method using the toner.Type: GrantFiled: May 4, 1999Date of Patent: August 1, 2000Assignee: Canon Kabushiki KaishaInventors: Manabu Ohno, Satoshi Handa, Akira Hashimoto, Keiji Komoto, Yasukazu Ayaki
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Patent number: 6096464Abstract: A photoreceptor including: (a) a substrate; (b) a charge generating layer; and (c) a charge transport layer including a charge transport material and a rotaxane material.Type: GrantFiled: January 27, 2000Date of Patent: August 1, 2000Assignee: Xerox CorporationInventors: Pudupadi R. Sundararajan, Dasarao K. Murti, Peter G. Odell, Gordon K. Hamer
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Patent number: 6096467Abstract: Disclosed are a positive charging color toner comprising a coloring agent and a positive charging electric charge controlling material in a fixing resin, wherein the fixing rein is an urethane-modified polyester resin having an acid value of not more than 5 KOHmg/g, a hydroxyl value of not more than 9 KOHmg/g, a weight-average molecular weight of 8,000 to 120,000 and a number-average molecular weight of 2,000 to 70,000, and the positive charging electric charge controlling material is (a) a quaternary ammonium salt having a melting point of not less than 200.degree. C., or (b) a styrene-acrylate copolymer having a trisubstituted amminio group and a glass transition temperature Tg of not less than 55.degree. C.Type: GrantFiled: November 12, 1998Date of Patent: August 1, 2000Assignee: Mita Industrial Co., Ltd.Inventors: Yoshitake Shimizu, Takahiro Ishihara, Hiroshi Shimoyama, Toyotsune Inoue, Takashi Nishino, Kazuya Nagao, Kenshi Matsui, Takayuki Itakura, Norio Horikami
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Patent number: 6096465Abstract: A toner composed of binder resin and carbon black particles has a volume-average particle diameter (D.sub.50) of 2.0 to 9.0 microns and a volume-average particle size distribution index (GSDv) of 1.25 or less. Carbon black particles adhering to the surfaces of toner particles have an absorption of 0.250 or less for ultraviolet radiation having a wavelength of 600 nm. Disclosed also are a method for producing the toner, a developer for developing an electrostatic latent image and a method in which the developer is used for forming animage.Type: GrantFiled: October 19, 1999Date of Patent: August 1, 2000Assignee: Fuji Xerox Co., Ltd.Inventors: Yasuo Kadokura, Hisae Ishikawa, Shuji Sato, Masaaki Suwabe, Yasuo Matsumura
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Patent number: 6097141Abstract: A photoconductive composition and a display device adopting a photoconductive layer formed of the composition. The photoconductive composition includes an electron donor, an electron acceptor, a charge transmitting substance, a binder, a surfactant and a solvent, and the photoconductive composition is characterized in that a 1,4-diphenyl-1-butene-3-yne derivative is used as the electron donor. The photoconductive composition has excellent sensitivity and thermal decomposition property. Thus, there are scarcely residues left after the sintering process, thereby effectively preventing deterioration in image quality of a display device.Type: GrantFiled: October 6, 1999Date of Patent: August 1, 2000Assignee: Samsung Display Devices Co., Ltd.Inventors: Bong-mo Jeong, Min-chul Suh, Sang-chul Shim
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Patent number: 6093513Abstract: Disclosed herein is a photoreceptor for electrophotography having an over coating layer formed on a substrate and prepared by applying a composition containing silica particles, an organic compound chemically bonded thereto and a photo polymerization initiator and by curing said composition; said organic compound having an polymerizable unsaturated group, a group designated by Formula (1) or a group designated by Formula (2), and said silica particles and said organic compound being bonded with each other through a silyloxy group. The photoreceptor for electrophotography has not only excellent durabilities and an excellent resistance to printing but also excellent electrophoto characteristics such as sensitivity and a residual potential. ##STR1## (wherein --X-- is selected from --NH--, --O-- and --S--, --Y-- is an oxygen atom or a sulfur atom, and when --X-- is --O--, Y is said sulfur atom).Type: GrantFiled: April 21, 1999Date of Patent: July 25, 2000Assignee: NEC CorporationInventors: Yoshinobu Takeda, Hiroyuki Endoh, Tsutomu Uezono
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Patent number: 6093514Abstract: The present invention provides novel .mu.-Oxo-aluminum/gallium phthalocyanine dimer having a structure of the formula (A): ##STR1## The .mu.-oxo-aluminum/gallium phthalocyanine dimer, and the mixed crystals comprising the .mu.-oxo-aluminum/gallium phthalocyanine dimer are suitable as a charge generating material for an organic photoconductive material, such as an electrophotographic photoreceptor.Type: GrantFiled: November 24, 1999Date of Patent: July 25, 2000Assignee: Orient Chemical Industries, Ltd.Inventors: Yasuhiro Yamasaki, Kenji Takaki, Kazuyoshi Kuroda
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Patent number: 6090514Abstract: The present invention provides an electrophotosensitive material comprising a conductive substrate and a single photosensitive layer containing a stilbene derivative (hole transferring material) represented by the general formula (1): ##STR1## (wherein R.sup.1, R.sup.2, R.sup.5 and R.sup.6 are the same or different and represent an alkyl group, an alkoxy group, an aryl group, an aralkyl group or a halogen atom; m, n, p and q are the same or different and represent an integer of 0 to 3, with the proviso that m and n represent a different integer when substituents represented by R.sup.1 and R.sup.2 are the same and that p and q represent a different integer when substituents represented by R.sup.5 and R.sup.6 are the same; and R.sup.3 and R.sup.4 are the same or different and represent a hydrogen atom or an alkyl group) and an electron transferring material, which is provided on the conductive substrate.Type: GrantFiled: August 20, 1999Date of Patent: July 18, 2000Assignee: Mita Industrial Co., Ltd.Inventors: Mikio Kakui, Hirofumi Kawaguchi, Akihiko Kawahara, Kazunari Hamasaki, Yoshio Inagaki, Ayako Yashima
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Patent number: 6087057Abstract: Magnetic particles of the present invention comprise:magnetic core particles; anda rein composition coat formed on each surface of said magnetic core particles, comprising a metal-based curing agent, a silane-based coupling agent oligomer and a silicone resin,and having an average particle size of 10 to 200 .mu.m.Such magnetic particles are useful for an electrophotographic magnetic carrier for an electrophotographic developer which have an excellent durability and a stable charging property.Type: GrantFiled: September 24, 1999Date of Patent: July 11, 2000Assignee: Toda Kogyo CorporationInventors: Toshiyuki Hakata, Hiroshi Akai
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Patent number: 6087058Abstract: A toner for electrophotography including a binder resin and a colorant, in which the binder resin includes as a main component a thermoplastic resin, which is a linear polyester prepared by using upon polymerization in an amount of 20 mol % or more in an entire alcohol component at least one of the following alcohol components (A) a bisphenol A having polyoxypropylene group containing 90% or more of the compound represented by the general formula (I): ##STR1## wherein each of m and n is 0 to 2, m+n being 2.0; and (B) a bisphenol A having polyoxyethylene group containing 88% or more of the compound represented by the general formula (II): ##STR2## wherein each of p and q is 0 to 2, p+q being 2.0.Type: GrantFiled: October 13, 1998Date of Patent: July 11, 2000Assignee: Kao CorporationInventors: Tetsuhiro Semura, Yoshihiro Ueno, Shingo Nonohara
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Patent number: 6083654Abstract: A toner including a resin, a colorant, and a bimodal wax.Type: GrantFiled: December 21, 1998Date of Patent: July 4, 2000Assignee: Xerox CorporationInventor: Pinyen Lin
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Patent number: 6083655Abstract: A developing method including the steps of: stirring a two component-type developer which contains a toner and a carrier; conveying the developer to a developing section with a conveying screw and a developer carrying member; and developing an electrostatic latent image on an image holding member by forming a magnetic brush on a developing magnetic pole, wherein the carrier is a magnetic material dispersion-type resin carrier containing a binder resin and a metal oxide, has a low coercive force and has been previously exposed and magnetized in a specific magnetic field and has stable residual magnetization, thereby imparting a high durability to the developer and making it usable for a long time to reproduce a large number of images having stable qualities.Type: GrantFiled: July 15, 1999Date of Patent: July 4, 2000Assignee: Canon Kabushiki KaishaInventors: Hitoshi Itabashi, Yuko Sato, Yoshinobu Baba, Yuzo Tokunaga
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Patent number: 6080518Abstract: A photoconductor for use in electrophotographic reproduction devices is disclosed. The photoconductor provides simultaneous improvement in both photoreceptor sensitivity and fatigue, while also providing higher charge voltage, lower residual voltage and lower dark decay. The photoconductor of the present invention includes simple quinone additives in either the charge generation layer, the charge transport layer, or both layers. Quinone additives are preferably selected from o-quinone, duroquinone, diphenoquinone, naphthaquinone, and mixtures of those materials, with duroquinone and the mixture E+Z 3, 3'-di-t-butyl-5, 5'-dimethyl diphenoquinones being preferred.Type: GrantFiled: June 8, 1999Date of Patent: June 27, 2000Assignee: Lexmark International, Inc.Inventors: Ronald Harold Levin, Scott Thomas Mosier
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Patent number: 6077635Abstract: A toner is disclosed which has toner particles and an external additive. The toner has (a) in circularity distribution of particles measured with a flow type particle image analyzer, an average circularity of from 0.920 to 0.995, containing particles with a circularity of less than 0.950 in an amount of from 2% by number to 40% by number; and (b) a weight-average particle diameter of from 2.0 .mu.m to 9.0 .mu.m as measured by Coulter method. The external additive has, on the toner particles, at least (i) an inorganic fine powder (A) present in the state of primary particles or secondary particles and having an average particle length of from 10 m.mu.m to 400 m.mu.m and a shape factor SF-1 of from 100 to 130 and (ii) a non-spherical inorganic fine powder (B) formed by coalescence of a plurality of particles and having a shape factor SF-1 of greater than 150. Also, a two-component developer and an image forming method, using the toner, are disclosed.Type: GrantFiled: June 18, 1998Date of Patent: June 20, 2000Assignee: Canon Kabushiki KaishaInventors: Kenji Okado, Ryoichi Fujita, Wakashi Iida, Yuji Moriki, Kazumi Yoshizaki, Michihisa Magome
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Patent number: 6077636Abstract: A toner is comprised of toner particles containing at least a binder resin and a colorant, and an external additive fine powder. The toner particles have a specific circularity distribution and a specific particle size distribution. The external additive fine powder has an inorganic fine powder having as primary particles a specific number-average particle length, and a non-spherical inorganic fine powder formed by coalescence of particles and having a specific shape factor and a specific number-average particle length.Type: GrantFiled: January 22, 1999Date of Patent: June 20, 2000Assignee: Canon Kabushiki KaishaInventors: Yuji Moriki, Kenji Okado, Hiroaki Kawakami, Shinya Yachi, Michihisa Magome
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Patent number: 6077639Abstract: A toner for electrophotography comprising a resin binder comprising a polyester resin, as a main component, obtained by polycondensing an alcohol component with a carboxylic acid component, wherein the alcohol component comprises an alkylene oxide adduct of bisphenol A represented by the formula (I): ##STR1## wherein R is an alkylene group having 2 or 3 carbon atoms; x and y are positive numbers showing an average molar number of an added oxyalkylene group, wherein a sum of x and y is from 1.5 to 10, in an amount of 60% by mol or more of the alcohol component, and wherein the carboxylic acid component comprises a tricarboxylic acid compound, wherein a number-average molecular weight of the polyester resin is 1,000 to 8,000; and a coloring agent, wherein an alkylene oxide adduct of bisphenol A of which addition molar number is 3 or more is not present in the polyester resin, or remains in an amount of less than 1.0% by weight.Type: GrantFiled: December 7, 1999Date of Patent: June 20, 2000Assignee: Kao CorporationInventors: Tetsuhiro Semura, Yoshihiro Ueno
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Patent number: 6068959Abstract: This invention relates to a coated carrier for development of an electrostatically charged image, comprising carrier core particles coated with a coating resin; wherein the coating resin at least includes a polyolefin resin having a cyclic structure; a polyolefin resin of a cyclic structure having an intrinsic viscosity (i.v.) of 0.25 dl/g or more, a heat distortion temperature (HDT) by DIN53461-B of 70 .degree. C. or higher, and a number average molecular weight of 7,500 or more and a weight average molecular weight of 15,000 or more, as measured by GPC, is contained in an amount of less than 50% by weight based on the entire coating resin; and the coating resin is used for coating in an amount of 1 to 30% by weight based on the carrier core particles. The present invention can obtain a coated carrier which exhibits high anti-spent toner effect and excellent charge control properties during development with a dry toner.Type: GrantFiled: May 20, 1998Date of Patent: May 30, 2000Assignees: Hoechst Research & Technology, Deutschland GmbH & Co. KGInventors: Toru Nakamura, Toshimi Nishioka, Takuya Hoga, Nobuyuki Kurokawa, Junichi Fukuzawa, Horst-Tore Land, Fredy Helmer-Metzmann
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Patent number: 6066422Abstract: A process including:blending toners from a set of primary toners to form a set of secondary toners; anddeveloping the secondary color toners to form spot color images, wherein the color gamut of all said images embody substantially the entire PANTONE.RTM. spot color space.Type: GrantFiled: October 23, 1998Date of Patent: May 23, 2000Assignee: Xerox CorporationInventors: Sue E. Blaszak, Edul N. Dalal, Kristen M. Natale-Hoffman, Elliott A. Eklund, Paul C. Julien
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Patent number: 6066427Abstract: Charge generation layers comprise a type I polymorph of titanyl phthalocyanine prepared by pre-milling a type IV polymorph in a media mill. Dual layer photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer.Type: GrantFiled: July 26, 1999Date of Patent: May 23, 2000Assignee: Lexmark International, Inc.Inventors: David Glenn Black, Laura Lee Kierstein, Ronald Harold Levin