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11. 发明专利

JP4602880B2 The toner, and a developer, toner container, process cartridge, image forming apparatus and image forming method 有权
公开(公告)号：JP4602880B2
公开(公告)日：2010-12-22
申请号：JP2005270307
申请日：2005-09-16
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 , 理内野倉 , 宏一坂田 , 昭宏小番 , 裕士山下 , 智之市川 , 拓也斉藤 , 賢望月 , 安雄朝比奈 , 英樹杉浦 , 園生松岡 , 博人樋口 , 雅之石井 , 庸泰長友
IPC分类号： G03G9/08 , G03G9/087
摘要： PROBLEM TO BE SOLVED: To provide a toner that can maintain sufficient transferability and cleaning ability for prolonged periods, prevent filming without causing variation in image nonuniformity or external additive immersion, and excels in stability so that flowability and charge stability are not changed over prolonged periods; and also to provide a developer, a toner container, a process cartridge, an image forming apparatus, and an image forming method. SOLUTION: The toner comprises at least external additives, in which the external additives consist of large-diameter particles and small-diameter particles of the volume average grain size smaller than that of the large-diameter particles. The number of pieces of the aggregates of the external additives left on the sieve of 635-mesh and 452 cm 2 of mesh area, after 0.2 g of the toner on the sieve is blasted with air at a blow pressure of 0.2 MPa from 160 mm above the sieve while being air-suctioned at a suction force of 5 mmHg, and then air-suctioned at a suction force of 20 mmHg, is 5 to 4,500. COPYRIGHT: (C)2007,JPO&INPIT

12. 发明专利

JP4364812B2 Process for producing a toner for developing electrostatic images, the toner for developing electrostatic images, a developer, an image forming apparatus, image forming method and a process cartridge 有权
公开(公告)号：JP4364812B2
公开(公告)日：2009-11-18
申请号：JP2005023371
申请日：2005-01-31
申请人：三洋化成工業株式会社 , 株式会社リコー
发明人：文浩佐々木 , 周平八尋 , 理内野倉 , 拓也斉藤 , 賢望月 , 園生松岡 , 唯雄滝川 , 英利野田
IPC分类号： G03G9/087 , G03G9/08 , G03G9/097
摘要： PROBLEM TO BE SOLVED: To provide a toner responding to an image forming system which requires a higher speed and higher reliability, having high charging ability and little toner portion with weak charges or inverted charges, capable of forming an image with less contamination on a base even after output of images in several ten thousands sheets, hardly causing scattering in an apparatus and resulting picture quality with sufficient image density, and to provide a method for manufacturing the toner. SOLUTION: The method for manufacturing a toner for electrostatic charge image development includes steps of granulating an organic solvent composition containing at least a binder resin and a colorant in an organic solvent in an aqueous medium and then externally adding a charge controlling agent in a wet state, dehydrating and filtering, and drying. A process interval period (t) (hour) from the dehydration and filtration step to the drying step, and a storage environment temperature (T) (°C) of a cake after dehydration in the process interval period satisfy relational formula (1):t≤80e (-0.07T) and/or (2), wherein Δtm defined by tm-t(m-1) represents a time difference on measuring a m-th temperature, and T(t=tm) represents a temperature T at the time tm, and T is in the range of 5≤T COPYRIGHT: (C)2006,JPO&NCIPI

13. 发明专利

JP4299197B2 Method of manufacturing a toner for developing an electrostatic charge image 有权
公开(公告)号：JP4299197B2
公开(公告)日：2009-07-22
申请号：JP2004192697
申请日：2004-06-30
申请人：株式会社リコー
发明人：慎也中山 , 久志中島 , 理内野倉 , 宏一坂田 , 昭宏小番 , 康敬岩本 , 仁岩附 , 智之市川 , 拓也斉藤 , 賢望月 , 安雄朝比奈 , 英樹杉浦
IPC分类号： G03G9/087 , G03G9/08
摘要： PROBLEM TO BE SOLVED: To provide an electrostatic charge image developing toner and a developer having a stabilized particle size distribution of the toner, adaptable to a low-temperature fixing system, exhibiting proper offset resistance, staining neither fixing means not image, and capable of forming stable images, and to provide an electrophotographic system image forming apparatus and a process cartridge that use the developer. SOLUTION: The electrostatic charge image developing toner is includes processes where; an organic solvent phase in which at least a functional group-containing polyester resin has been dissolved, an active hydrogen-containing compound and a colorant are dispersed in an aqueous medium phase, in which resin fine particles have been dissolved, the functional group-containing polyester resin and the active hydrogen-containing compound are brought into an extension reaction and/or a crosslinking reaction, and particles are formed from the resulting dispersion, wherein an organic acid compound is contained in the organic solvent phase. COPYRIGHT: (C)2006,JPO&NCIPI

14. 发明专利

JP4136566B2 Charge imparting material, an electrostatic image developing toner using the same, a developer carrying member and a developer regulating member 有权
公开(公告)号：JP4136566B2
公开(公告)日：2008-08-20
申请号：JP2002276503
申请日：2002-09-24
申请人：株式会社リコー , 竹本油脂株式会社
发明人：博貴小木曽 , 龍彦尾▲崎▼ , 拓也斉藤 , 聡新谷 , 陽一郎渡辺 , 豊志澤田 , 桂子白石 , 政則鈴木
IPC分类号： G03G9/097 , G03G9/087 , G03G9/09
摘要： PROBLEM TO BE SOLVED: To provide a charge imparting material capable of imparting a quantity of charges suitable for a developing system to a toner in triboelectric charge between toner particles, between the toner and a carrier, or between the toner and a charge imparting member such as a developing sleeve or a blade in the case of monocomponent development. SOLUTION: The charge imparting material is characterized by comprising a mixture of the barium salt of an organic acid derivative and a metallic salt of a salicylic acid derivative (other than the barium salt), preferably a mixture of a compound of formula (1) and a compound of formula (3). COPYRIGHT: (C)2003,JPO

15. 发明专利

JP3948716B2 Color toner, image forming apparatus and a toner container for an image forming 有权
公开(公告)号：JP3948716B2
公开(公告)日：2007-07-25
申请号：JP2002244496
申请日：2002-08-26
申请人：株式会社リコー
发明人：孝幸小池 , 裕士山下 , 康敬岩本 , 拓也斉藤 , 賢望月 , 恒心杉山 , 陽一郎渡辺 , 政則鈴木 , 毅高田
IPC分类号： G03G9/08 , G03G9/09 , G03G9/087
CPC分类号： G03G9/08797 , G03G9/08755 , G03G9/08764 , G03G9/08768 , G03G9/08782 , G03G9/08791 , G03G9/08795
摘要： 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.

16. 发明专利

JP3812890B2 Color toner for developing an electrostatic image 有权
公开(公告)号：JP3812890B2
公开(公告)日：2006-08-23
申请号：JP2002005199
申请日：2002-01-11
申请人：株式会社リコー
发明人：拓也斉藤 , 陽一郎渡辺 , 豊志澤田 , 桂子白石 , 政則鈴木 , 将志長山
IPC分类号： G03G9/08 , G03G9/09 , G03G9/087
摘要： PROBLEM TO BE SOLVED: To provide color toners having moderate image gloss and excellent color reproducibility. SOLUTION: The electrostatic charge image developing color toners containing coloring agents, ≥2 kinds of resins and release agents are characterized in that ≥2 kinds of the resins and the release agents are incompatible with each other; ≥2 kinds of the resins have a sea-and-island-like phase separation structure; the phase separation structure is dispersed with the island-like resins (B) consisting of ≥1 kind of the resins in the sea-like resin (A) of a continuous phase consisting of ≥1 kind of the resin and is substantially included with the release agent in the island-like resins; the resins do not contain a THF insoluble component; the weight average molecular weight by a GPC is 10,000 to 90,000; ≥1 kind of at least inorganic particulates and/or resin particulates are externally added to the toners; and the elements to cause the liberation rate of the external additives to attain 1 to 5 number % exist in ≥1 kind. COPYRIGHT: (C)2003,JPO

17. 发明专利

JP4718738B2 Toner for developing an electrostatic latent image 有权
公开(公告)号：JP4718738B2
公开(公告)日：2011-07-06
申请号：JP2001290024
申请日：2001-09-21
申请人：株式会社リコー
发明人：拓也斉藤 , 陽一郎渡辺 , 豊志澤田 , 桂子白石 , 政則鈴木
IPC分类号： G03G9/08 , G03G9/087 , G03G9/097
摘要： PROBLEM TO BE SOLVED: To provide electrostatic charge image developing toners which are excellent in all of an offset resistance, transferability, durability, pulverizability, electrostatic chargeability, and the environment stability of electrostatic charge and have excellent color reproducibility as well when the toners are used for full colors. SOLUTION: In the electrostatic charge image developing toners containing at least >=2 kinds of binder resins, a charge control resin and wax, these components are incompatible with each other and have a sea-and-island-like phase separating structure; another binder resin B and the charge control resin are dispersed like islands in the sea-like binder resin A which is a continuous phase; the wax is substantially included in the island-like binder resin B; and external additives subjected to a treatment to impart hydrophobic properties on the toner surfaces are included into the toners.

18. 发明专利

JP4602611B2 Color toner for developing an electrostatic image 有权
公开(公告)号：JP4602611B2
公开(公告)日：2010-12-22
申请号：JP2001270860
申请日：2001-09-06
申请人：株式会社リコー
发明人：拓也斉藤 , 陽一郎渡辺 , 豊志澤田 , 桂子白石 , 政則鈴木
IPC分类号： G03G9/08 , G03G9/09 , G03G9/087
摘要： PROBLEM TO BE SOLVED: To provide an electrostatic charge image developing color toner having proper image gloss, excellent color reproducibility and showing both of sufficient offset preventing property and excellent durability (electrification characteristics) even in a method of fixing without applying a release oil to a fixing member or applying a minute amount of oil. SOLUTION: The electrostatic charge image developing color comprising at least a binder resin and a coloring agent is characterized in that the binder resin consists of a polyol resin having 9,000 to 13,000 molecular weight at the peak top of the molecular weight distribution curve by gel permeation chromatography (GPC) and having

19. 发明专利

JP4571024B2 Production method of the emulsified particles 有权
公开(公告)号：JP4571024B2
公开(公告)日：2010-10-27
申请号：JP2005186820
申请日：2005-06-27
申请人：株式会社リコー
发明人：将士宮川 , 彰法斉藤 , 拓也斉藤 , 園生松岡 , 真弘渡邊 , 寛高橋
IPC分类号： C08J3/02 , B01F3/08

20. 发明专利

JP4489670B2 Method of manufacturing a toner for developing an electrostatic charge image 有权
公开(公告)号：JP4489670B2
公开(公告)日：2010-06-23
申请号：JP2005269560
申请日：2005-09-16
申请人：株式会社リコー
发明人：拓也斉藤 , 園生松岡 , 寛高橋 , 昇黒田
IPC分类号： G03G9/087
摘要： PROBLEM TO BE SOLVED: To provide a manufacturing method for toner in which toner having an invariably stable volume mean particle size and a sharp particle size distribution is easily manufactured without waste, the toner being suitable to a fixing device capable of saving energy, having excellent developing property for a long period, and forming an image of high image quality. SOLUTION: Disclosed is the manufacturing method for the toner including an emulsifying and dispersing stage of obtaining emulsified liquid by mixing an organic solvent composition containing a binder resin and a coloring agent at least in an organic solvent with a water type medium and applying shearing force to the mixed liquid, the manufacturing method for toner for electrostatically charged image developer being characterized in that the volume mean particle size of toner particles present in the emulsified liquid obtained when the weight ratio of the organic solvent composition and water type medium in the mixed liquid is varied within a range of 60:40 to 20:80 is measured and the emulsifying and dispersing stage is carried out within a range of the weight ratio [%] of the organic solvent composition such that the relation between the weight ratio [%] of the organic solvent composition to all the mixed liquid and the volume mean particle size under fixed shearing force conditions is -6.0 to +6.0 (μm/%). COPYRIGHT: (C)2007,JPO&INPIT

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