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71. 发明专利

JP3892394B2 Carrier for an electrophotographic developer 有权
公开(公告)号：JP3892394B2
公开(公告)日：2007-03-14
申请号：JP2002362297
申请日：2002-12-13
申请人：株式会社リコー
发明人：直樹今橋 , 昭宏小番 , 公利山口 , 元治田中 , 宏明高橋
IPC分类号： G03G9/08 , G03G9/107 , G03G9/087 , G03G9/113
摘要： PROBLEM TO BE SOLVED: To provide a highly durable carrier which causes no carrier adhesion to a photoreceptor even when the particle diameter of the carrier is small, stabilizes electrostatic and developing properties of a toner, can achieve high image quality on a permanent basis, and has a long life. SOLUTION: The carrier for an electrophotographic developer is obtained by using a material comprising a metal oxide comprising Fe oxide and Tb oxide and represented by the formula Tb x Fe 3-x O 4 (where 0.25≤x≤1.25). In the carrier for an electrophotographic developer, the metal oxide may further contain an additive A, wherein the additive A is one or more selected from Al, Si, Ti, Cr, Mn, Co, Ni, Cu, Zn, Ga and Sr, and in this case, the carrier is obtained by using a material represented by the formula Tb x (Fe 1-y A y ) 3-x O 4 (where 0.25≤x≤1.25, and 0 COPYRIGHT: (C)2004,JPO&NCIPI

72. 发明专利

JP3368387B2 Method of producing composite particles 失效
公开(公告)号：JP3368387B2
公开(公告)日：2003-01-20
申请号：JP4577593
申请日：1993-02-10
申请人：株式会社リコー
发明人：弘一加藤 , 昭宏小番 , 裕士山下 , 広光川瀬 , 陽一郎渡辺
IPC分类号： B01J13/04 , C08J3/12 , C08L101/00 , C09C3/08 , G03G9/08 , G03G9/087
摘要： PURPOSE:To provide the production method of the blended particles which is excellent in not only the releasing property and cleaning property of residual toner but also the property as the toner when used as a toner for electrophotography. CONSTITUTION:The base body (A) having polar group on the surface which is dispersed in hydrophilic org. liq. or water or mixed liq. of these and the emulsion of wax (B) which is dispersed in hydrophilic org. liq. or water or mixed liq. of these using a nonionic surfactant as a emulsifying agent are mixed in the presence of the surfactant having reversed polarity with the surface of the base body (A). Then, particulate of wax are allowed to be stuck and fixed on the surface of the base body by heating the dispersed liq. after mixing, if necessary, subjected to solid-liquid separation and washing, and dried.

73. 发明专利

JP5471164B2 Toner, developer, image forming apparatus 有权
公开(公告)号：JP5471164B2
公开(公告)日：2014-04-16
申请号：JP2009194691
申请日：2009-08-25
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 , 芳洋森屋 , 真悟阪下 , 景子尾阪 , 祥敬山内 , 由紀子中島
IPC分类号： G03G9/087 , G03G9/10
摘要： PROBLEM TO BE SOLVED: To provide a toner which ensures good image density and excels also in fixability and environmental stability and a developer using the toner. SOLUTION: (1) The toner comprises a resin (b) having a polyhydroxycarboxylic acid skeleton, wherein a content of a methanol-soluble component extracted by a methanol solvent is ≤6 wt.% relative to the weight of the toner. (2) The toner described in (1) comprises resin particles (C) of a structure in which resin particles (A) comprising a resin (a) adhere to a surface of a resin particle (B) comprising the resin (b) having the polyhydroxycarboxylic acid skeleton. COPYRIGHT: (C)2011,JPO&INPIT

74. 发明专利

JP5415185B2 Toner and developer 有权
公开(公告)号：JP5415185B2
公开(公告)日：2014-02-12
申请号：JP2009196952
申请日：2009-08-27
申请人：株式会社リコー , 三洋化成工業株式会社
发明人：祥敬山内 , 芳洋森屋 , 竜太井上 , 真悟阪下 , 景子尾阪 , 顕芳左部 , 由紀子中島 , 昭宏小番 , 将和岩田 , 一裕高橋
IPC分类号： G03G9/087 , G03G9/08
摘要： PROBLEM TO BE SOLVED: To provide toner capable of securing hot offset resistance, having excellent low temperature fixability and stable image density without inducing filming on a photoreceptor, giving an image having a favorable haze degree and environmental stability, and having good heat-resistant storage property; and to provide a developer using the toner. SOLUTION: (1) The toner contains a resin (b) having a polyhydroxy carboxylic acid skeleton and a grafted polymer comprising at least a polyolefin resin and a vinyl resin. (2) The toner described in (1) contains resin particles (C) having such a structure that resin particles (A) containing a resin (a) adhere to the surfaces of resin particles (B) containing the resin (b) having a polyhydroxy carboxylic acid skeleton. COPYRIGHT: (C)2011,JPO&INPIT

75. 发明专利

JP5397756B2 Toner for developing an electrostatic latent image 有权
公开(公告)号：JP5397756B2
公开(公告)日：2014-01-22
申请号：JP2009154499
申请日：2009-06-30
申请人：株式会社リコー
发明人：竜太井上 , 昭宏小番 , 顕芳左部 , 真悟阪下 , 由紀子中島 , 景子尾阪
IPC分类号： G03G9/08 , G03G9/087 , G03G9/10
CPC分类号： G03G9/0806 , G03G9/08711 , G03G9/08755 , G03G9/08791 , G03G9/08797
摘要： An electrostatic image developing toner including a toner particle (C), wherein the toner particle (C) has a structure in which a resin particle (A) containing at least a first resin (a) or a coated film (P) containing the first resin (a) is attached to a surface of a resin-containing particle (B) containing a second resin (b), and wherein the resin (b) includes a polyhydroxycarboxylic acid skeleton, and the resin (a) is a polyester resin containing a polybasic acid and a polyhydric alcohol.

76. 发明专利

JP5311288B2 Carrier, and a developer using the same, an image forming method 有权
公开(公告)号：JP5311288B2
公开(公告)日：2013-10-09
申请号：JP2009173530
申请日：2009-07-24
申请人：株式会社リコー
发明人：祥敬山内 , 昭宏小番 , 芳洋森屋
IPC分类号： G03G9/113
摘要： PROBLEM TO BE SOLVED: To provide a carrier for electrostatic latent image development which is highly safety for the environment and can be produced inexpensively, and which nonetheless has improved adhesiveness between a coating layer and a core material and is less apt to cause degradation in the image quality accompanying toner spent and film chipping in the coating layer, even when a developer is agitated over a long period of time, and to provide a two-component developer and an image forming method that uses the carrier. SOLUTION: The carrier for a dry two-component developer is a carrier having a core material and a coating layer formed on the surface of the core material and is such that: the coating layer is formed by using a composite resin containing a polysiloxane segment and a segment produced by radical polymerization; and the composite resin is obtained by radical emulsion polymerization of, in the presence of (A) a partial condensate of organosilane, (B) a radical polymerizable monomer and (C) a vinyl crosslinking agent, having a radical polymerizable group and a condensation reactive group that can induce a condensation reaction with the partial condensate of the organosilane. COPYRIGHT: (C)2011,JPO&INPIT

77. 发明专利

JP5288328B2 toner 有权
公开(公告)号：JP5288328B2
公开(公告)日：2013-09-11
申请号：JP2008265420
申请日：2008-10-14
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 , 竜太井上
IPC分类号： G03G9/087 , G03G9/08 , G03G9/097
摘要： PROBLEM TO BE SOLVED: To provide toner which is excellent in low-temperature fixability while ensuring hot offset resistance and with which an image good in image density and haze value can be obtained. SOLUTION: The toner comprises resin particles (C) obtained by attaching resin particles (A) containing a first resin (a) or a film (P) containing the resin (a) to the surface of resin particles (B) containing a second resin (b) and a third resin (d). The resin (b) contains a linear polyester resin (b1) obtained by reacting a polyester diol (b11) containing a polyhydroxycarboxylic acid skeleton and a polyester diol (b12) other than the polyester diol (b11) with an extender. The resin (d) contains a polyhydroxycarboxylic acid skeleton comprising an optically active monomer, and the polyhydroxycarboxylic acid skeleton has an optical purity X (X(%)=¾X(L-body)-X(D-body)¾) of ≤80% in terms of the monomer component, wherein X(L-body) and X(D-body) represent an L-body ratio and a D-body ratio (mol%), respectively, in terms of the optically active monomer. COPYRIGHT: (C)2010,JPO&INPIT

78. 发明专利

JP5261978B2 The toner, and a developer, toner container, process cartridge, image forming apparatus and image forming method 有权
公开(公告)号：JP5261978B2
公开(公告)日：2013-08-14
申请号：JP2007127418
申请日：2007-05-11
申请人：株式会社リコー
发明人：強杉本 , 昭宏小番 , 慎也中山 , 顕芳左部 , 裕士山下 , 博山田 , 順一粟村
IPC分类号： G03G9/087 , G03G9/08
摘要： PROBLEM TO BE SOLVED: To provide a toner which is adaptable to a low-temperature fixing system, has good offset resistance, does not soil a fixing device and an image and can form high-quality images with good sharpness over a long period of time, and to provide a developer, a toner-containing container, a process cartridge, an image forming apparatus and an image forming method using the toner. SOLUTION: The toner includes at least a binder resin, a release agent and a fixing aid, wherein the binder resin includes a polyester resin, this polyester resin is obtained by condensation polymerization of an alcohol component including ≥65 mol% of 1,2-propanediol in a dihydric alcohol component and a carboxylic acid component including purified rosin, the polyester resin has a softening point of 80 to COPYRIGHT: (C)2009,JPO&INPIT

79. 发明专利

JP5245421B2 Method of manufacturing a toner 有权
公开(公告)号：JP5245421B2
公开(公告)日：2013-07-24
申请号：JP2008012704
申请日：2008-01-23
申请人：株式会社リコー
发明人：博山田 , 昭宏小番 , 慎也中山 , 顕芳左部 , 裕士山下 , 強杉本 , 順一粟村
IPC分类号： G03G9/087 , G03G9/08
摘要： PROBLEM TO BE SOLVED: To provide toner or the like having excellent low temperature fixability, offset resistance, preservability, mechanical strength, stain resistance to a development machine, filming properties to an electrostatic latent image carrier and a carrier, and pulverizability, and capable of forming a high quality image over a long period. SOLUTION: Disclosed is toner at least comprising a binding resin, a mold releasing agent and a coloring agent. The binding resin comprises: a polyester based resin (A) having a softening point Tm(A) of 120 to 160°C; a polyester based resin (B) having a softening point Tm(B) of 80 to COPYRIGHT: (C)2009,JPO&INPIT

80. 发明专利

JP5233536B2 Carrier, and a developer using the same, and image forming method 有权
公开(公告)号：JP5233536B2
公开(公告)日：2013-07-10
申请号：JP2008234341
申请日：2008-09-12
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 which has proper adhesion between a core material and a coating layer, prevents scraping and detaching of the coating layer, even in developer stirring over a long period of time, and prevents accompanying degradation of image quality, and to provide a developer using the carrier and an image forming method using the developer. SOLUTION: The carrier has the core material, and the coating layer containing a binder and fine particles on the surface of the core material; and the binder contains an acrylic resin containing as a constitutional unit at least one type of polymerizable vinyl monomer, and the polydispersity of the carrier is 2.0 or less in the molecular weight distribution, determined by styrene conversion using gel permeation chromatography of the acrylic resin. COPYRIGHT: (C)2010,JPO&INPIT

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