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1. 发明专利

JP5509797B2 Toner, and developer using the toner, an image forming method, image forming apparatus and process cartridge 有权
公开(公告)号：JP5509797B2
公开(公告)日：2014-06-04
申请号：JP2009255134
申请日：2009-11-06
申请人：株式会社リコー
发明人：由紀子中島 , 昭宏小番 , 芳洋森屋 , 竜太井上 , 顕芳左部 , 景子尾阪 , 真悟阪下 , 祥敬山内 , 大樹山下
IPC分类号： G03G9/087
摘要： PROBLEM TO BE SOLVED: To provide a toner having superior low-temperature fixing properties, proper charging stability in long-term agitation and favorable charging stability against changes in the use environment, such as temperature and humidity, while securing hot offset resistance and heat-resistant storage properties, even when a resin having a polyhydroxycarboxylic acid skeleton is used, and to provide a developer, an image forming method, an image forming apparatus and a process cartridge that use the toner. SOLUTION: The toner contains resin particles (C), which contain a first resin (a) and resin particles (B) containing a second resin (b), wherein the resin (a) is made of a polyurethane-acryl polymer composite and adheres to the surfaces of the resin fine particles, and the resin (b) has an amorphous polyhydroxycarboxylic acid skeleton. COPYRIGHT: (C)2011,JPO&INPIT

2. 发明专利

JP5447817B2 toner 有权
公开(公告)号：JP5447817B2
公开(公告)日：2014-03-19
申请号：JP2009219078
申请日：2009-09-24
申请人：株式会社リコー
发明人：顕芳左部 , 昭宏小番 , 竜太井上 , 景子尾阪 , 真悟阪下 , 由紀子中島 , 賢望月
IPC分类号： G03G9/087 , G03G9/08 , G03G9/09 , G03G9/097
CPC分类号： G03G9/08755 , G03G9/08762 , G03G9/09708 , G03G9/09716 , G03G9/09741 , G03G9/09766 , G03G9/09775 , G03G2215/0602
摘要： A toner including a binder resin comprising a resin (a) comprising a polyhydroxycarboxylic acid skeleton formed from an optically-active monomer. The polyhydroxycarboxylic acid skeleton has a weight average molecular weight of from 7,000 to 60,000. The binder resin comprises the polyhydroxycarboxylic acid skeleton in an amount of from 10 to 90% by weight. The optical purity X (%) of the polyhydroxycarboxylic acid skeleton represented by the following formula is 80% or less: X(%)=|X(L-isomer)-X(D-isomer)| wherein X(L-isomer) and X(D-isomer) represent molar ratio (%) of L-isomer and D-isomer of the optically-active monomer, respectively.

3. 发明专利

JP5233542B2 Carrier, and a developer using the same, and image forming method 有权
公开(公告)号：JP5233542B2
公开(公告)日：2013-07-10
申请号：JP2008237675
申请日：2008-09-17
申请人：株式会社リコー
发明人：真悟阪下 , 昭宏小番 , 芳洋森屋 , 竜太井上
IPC分类号： G03G9/113
摘要： PROBLEM TO BE SOLVED: To provide a carrier having excellent adhesiveness between a core material and a coating layer, suppressing deterioration of an image quality caused by scraping and peeling of the coating layer even in developing agent agitation for a long period, suppressing transfer of a toner component to a carrier surface, and thereby keeping a stable charging characteristic, and to provide the developing agent using the carrier, and an image forming device using the developing agent. SOLUTION: The carrier has the core material and the coating layer including a binder and particles on the core material surface. The binder includes an acrylic resin including at least one polymeric vinyl monomer as a constitution unit, and a silicone resin, and polydispersity in a molecular weight distribution determined in terms of styrene by using gel permeation chromatography of an acrylic resin is 2.0 or less. COPYRIGHT: (C)2010,JPO&INPIT

4. 发明专利

JP5196289B2 Fixer 有权
公开(公告)号：JP5196289B2
公开(公告)日：2013-05-15
申请号：JP2006284510
申请日：2006-10-19
申请人：株式会社リコー
发明人：泰男片野 , 恒夫黒鳥 , 友康平澤 , 琢磨中村 , 裕士山下 , 昭宏小番 , 強杉本
IPC分类号： G03G11/00 , G03G15/20
摘要： PROBLEM TO BE SOLVED: To provide a fixing method by which a fixed object has no tackiness after fixing and its reliability in long-term storage is greatly improved by using a combination of resin-containing fine particles which cause a chemical reaction for quick elimination of the tackiness of a resin-containing fine particle layer after fixing the resin-containing fine particle layer on a medium with a fixing solution. SOLUTION: In the fixing method, the fixing solution is used containing a softener which softens a resin by dissolving or swelling at least part of the resin, and the fixing solution is provided to the resin-containing fine particles containing a resin and a component which reacts with the fixing solution to control softening of the resin by a softener. As compared with the conventional wet fixing method, a fixed object has no tackiness after fixing and its reliability in long-term storage is greatly improved. COPYRIGHT: (C)2008,JPO&INPIT

5. 发明专利

JP5187091B2 Carrier, a developer and an image forming method 有权
公开(公告)号：JP5187091B2
公开(公告)日：2013-04-24
申请号：JP2008237132
申请日：2008-09-16
申请人：株式会社リコー
发明人：真悟阪下 , 昭宏小番 , 竜太井上 , 芳洋森屋 , 豊志澤田 , 顕芳左部
IPC分类号： G03G9/113 , G03G9/10
摘要： PROBLEM TO BE SOLVED: To provide a carrier suppressing reduction in image density and color contamination of toner, a developing agent having the carrier, and an image forming method for forming an image by using the developing agent. SOLUTION: In this carrier, a coating layer including a binding resin and conductive particles is formed on a surface of a magnetic core material particle, and the conductive particle is a phosphorus-doped conductive tin oxide particle comprising a free particle of tin oxide doped with phosphorus. COPYRIGHT: (C)2010,JPO&INPIT

6. 发明专利

JP5146670B2 toner 有权
公开(公告)号：JP5146670B2
公开(公告)日：2013-02-20
申请号：JP2008171943
申请日：2008-07-01
申请人：株式会社リコー
发明人：顕芳左部 , 昭宏小番 , 豊志澤田
IPC分类号： G03G9/087 , G03G9/08 , G03G9/097
摘要： PROBLEM TO BE SOLVED: To provide resin particles excellent in thermal characteristics, heat resistant storage stability and transparency and having a uniform particle diameter, even when a plant-derived resin, including polylactic acid, is used. SOLUTION: The toner comprises resin particles (C), having a structure of a resin particle (A) containing a first resin (a) or a coating film (P) containing the resin (a) deposited on the surface of a resin particle (B) containing a second resin (b), wherein the resin (b) contains a straight-chain polyester resin (b1), obtained by making a polyester diol (b11) having a polyhydroxycarboxylic acid skeleton react with a polyester diol (b12) other than (b11), together with a chain extending agent. COPYRIGHT: (C)2010,JPO&INPIT

7. 发明专利

JP5106988B2 Carrier and method of manufacturing the same of the electrophotographic toner, electrophotographic developer, and an image forming method 有权
公开(公告)号：JP5106988B2
公开(公告)日：2012-12-26
申请号：JP2007282457
申请日：2007-10-30
申请人：株式会社リコー
发明人：芳洋森屋 , 昭宏小番 , 竜太井上 , 真悟阪下
IPC分类号： G03G9/113
摘要： PROBLEM TO BE SOLVED: To provide a carrier of electrophotographic toner capable of preventing toner spent to the carrier from occurring and capable of reducing chipping of a cover layer. SOLUTION: The carrier of electrophotographic toner prepared by covering the surface of core material with a cover layer including at least binder resin and fine particles is manufactured according to a manufacturing method comprising: a first process of coating the surface of the core material with a coating liquid which includes either of the binder resin and a precursor of the binder resin, the fine particles having a volume average particle size of Dv expressed in terms of spherical size and solvent to form covered particles having a cover layer having an average film thickness h satisfying the relation (1) of Dv/h≤0.3; and a second process of performing surface treatment while agitating the covered particles by using an agitation device having no agitation blades. COPYRIGHT: (C)2009,JPO&INPIT

8. 发明专利

JP5054600B2 Toner and a method for producing the same, as well as the developer, the developer containing container, process cartridge, image forming method, and an image forming apparatus 有权
公开(公告)号：JP5054600B2
公开(公告)日：2012-10-24
申请号：JP2008109174
申请日：2008-04-18
申请人：株式会社リコー
发明人：慎也中山 , 昭宏小番 , 裕士山下 , 顕芳左部 , 芳洋森屋
IPC分类号： G03G9/087 , G03G9/08 , G03G9/10
摘要： PROBLEM TO BE SOLVED: To provide a toner which is excellent in image density, fixability and hot offset resistance, ensures less change in fixability, and includes a block copolymer obtained by blocking a racemic mixture of D-polylactic acid and L-polylactic acid with a polyester resin, a method for manufacturing the toner, and a developer, a developer container, a process cartridge, an image forming method and an image forming apparatus using the toner. SOLUTION: The toner is obtained by emulsifying or dispersing a solution or dispersion, prepared by dissolving or dispersing at least a binder resin and a colorant in an organic solvent, in an aqueous medium. The binder resin includes a first resin comprising a block X comprising a resin comprising a racemic mixture of optically active monomers of a D-form compound and an L-form compound, and a block Y comprising another resin except for the block X. The mass ratio of the D-form compound to the L-form compound is from 48/52 to 52/48, and the mass ratio of the block Y to the block X is from 1/3 to 3/1. COPYRIGHT: (C)2009,JPO&INPIT

9. 发明专利

JP4990577B2 Image forming method and image forming apparatus 有权
公开(公告)号：JP4990577B2
公开(公告)日：2012-08-01
申请号：JP2006207478
申请日：2006-07-31
申请人：株式会社リコー
发明人：慎也中山 , 久志中島 , 文浩佐々木 , 昭宏小番 , 賢望月 , 英樹杉浦
IPC分类号： G03G15/20 , G03G9/08 , G03G9/087 , G03G9/097
CPC分类号： G03G15/2007 , G03G9/0827 , G03G9/09708 , G03G9/09716 , G03G9/09725 , G03G15/2064 , G03G2215/0602 , G03G2215/2016 , G03G2215/2032 , G03G2215/2035
摘要： To provide an image forming method including forming a latent electrostatic image on a latent electrostatic image bearing member, developing the latent electrostatic image using a toner to form a visible image, transferring the visible image to a recording medium, and fixing a transfer image transferred on the recording medium, wherein the toner includes a toner base particle containing at least a binder resin, a colorant and an inorganic fine particle, and a charge control agent; and wherein the condition Xsurf>Xtotal is satisfied (where Xsurf is an average proportion of the inorganic fine particles in a near-surface region of the toner base particle, Xtotal is an average proportion of inorganic fine particles in the whole toner base particle.

10. 发明专利

JP4943290B2 Toner and developer 有权
公开(公告)号：JP4943290B2
公开(公告)日：2012-05-30
申请号：JP2007272852
申请日：2007-10-19
申请人：株式会社リコー
发明人：慎也中山 , 伸二大谷 , 昭宏小番 , 隆浩本多 , 義浩法兼 , 陽一郎渡辺 , 一己鈴木
IPC分类号： G03G9/087 , G03G9/08
摘要： PROBLEM TO BE SOLVED: To provide a toner which is excellent in offset resistance, low-temperature fixability, fixing releasability, hot storage resistance and filming resistance, does not emit a foul odor, forms a high-definition and high-quality image with high resolution, and avoids image deterioration over a long period of time. SOLUTION: The toner is manufactured by a manufacturing method including: a periodic dripping step of dripping and periodically discharging a toner composition liquid from a plurality of nozzles by vibrating a thin film having the plurality of nozzles attached to a retention part retaining the toner composition liquid, prepared by dissolving or dispersing a toner composition comprising a binder resin, a colorant and a release agent in a solvent, by a vibratory means disposed in an annular shape around a region of the thin film having the nozzles; and a toner particle forming step of forming toner particles by solidifying the discharged droplets of the toner composition liquid. The binder resin includes a polyester resin obtained by condensation polymerization of an alcohol component including an aliphatic polyhydric alcohol and a carboxylic acid component including (meth)acrylic modified rosin. COPYRIGHT: (C)2009,JPO&INPIT

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