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1. 发明专利

JPH07110599A ELECTROSTATIC CHARGE IMAGE DEVELOPER AND ITS PRODUCTION 失效
公开(公告)号：JPH07110599A
公开(公告)日：1995-04-25
申请号：JP25346593
申请日：1993-10-08
申请人： KONISHIROKU PHOTO IND
发明人： KAMIYAMA MIKIO , HAYASHI KENJI , KIKUCHI TOMOE , TSUJITA KENJI
IPC分类号： G03G9/087 , G03G9/08
摘要： PURPOSE:To obtain a developer preventing imperfect cleaning of a photoreceptor or an electrostatic recording body or toner filming, not reducing the extent of electrostatic charge of the toner over a long period of time and preventing the lowering of image density and the increase of fog. CONSTITUTION:When toner particles are mixed with fine powder whose volume average particle diameter is smaller than the average particle diameter of the toner particles to obtain a developer, silicone rubber combined fine resin powder formed by bringing a hydrophobic monomer into multistage seed polymn. with silicone rubber latex as seed particles are used as the fine powder. The fine resin powder is practically spherical and has 0.05-5mum average particle diameter.

2. 发明专利

JPH04199062A CARRIER FOR DEVELOPMENT OF ELECTROSTATIC IMAGE 失效
公开(公告)号：JPH04199062A
公开(公告)日：1992-07-20
申请号：JP32604990
申请日：1990-11-29
申请人： KONISHIROKU PHOTO IND
发明人： OMURA TAKESHI , TSUJITA KENJI , KOUNO MASANORI
IPC分类号： G03G9/087 , G03G9/107
摘要： PURPOSE:To enable the stable exertion of good frictional electrostatic charging characteristic and anti toner spent property for a long time and provide good durability by forming a binder from thermoplastic silicone resin having a specific softening point. CONSTITUTION:A carrier for development as per invention is of magnetic substance dispersion type, and a binder for it is formed from thermoplastic silicone resin having a softening point of 70-150 deg.C. A figure below 70 deg.C worsens the anti-blocking property of the carrier to cause poor performance of development. A figure exceeding 150 deg.C makes it difficult to melt together with magnetic substance and to knead. This permits exerting excellent frictional electrostatic charging characteristic, gives it a high stability even in the course of long time service, and ensures an enhanced durability.

3. 发明专利

JPH03296772A CARRIER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE 失效
公开(公告)号：JPH03296772A
公开(公告)日：1991-12-27
申请号：JP9938590
申请日：1990-04-17
申请人： KONISHIROKU PHOTO IND
发明人： OMURA TAKESHI , TSUJITA KENJI , KOUNO MASANORI
IPC分类号： G03G9/113
摘要： PURPOSE:To obtain the carrier for developing electrostatic charge images with which the initial characteristics are exhibited stably over a long period of time and which have excellent durability by forming a resin coating layer by a dry process and dispersing and incorporating a carbon fluoride into the resin coating layer. CONSTITUTION:The dry process is adopted as a coating means and the content ratio of the carbon fluoride in the resin coating layer is controlled to a specified range (0.5 to 45wt.%), by which the uniformity of the dispersion of the carbon fluoride in the resin coating layer is improved. Namely, the coating resin and the carbon fluoride exist as secondary flocs in the beginning of the stage for mixing and agitating of the core material particles and the coating material but the secondary flocs of the coating resin and the carbon fluoride are eventually disintegrated by the mechanical forces that the secondary flocs receive by the agitation in the process for forming the resin coating layer by sticking and including of these secondary flocs to and in the surface of the core material particles. The carbon fluoride is sufficiently uniformly dispersed and incorporated into the resin coating layer and the good copied images without generating the fogging are stably formed many times.

4. 发明专利

JPH03290674A ELECTROSTATIC CHARGE IMAGE DEVELOPER 失效
公开(公告)号：JPH03290674A
公开(公告)日：1991-12-20
申请号：JP9224490
申请日：1990-04-09
申请人： KONISHIROKU PHOTO IND
发明人： ENDO ISAO , TSUJITA KENJI , OKUYAMA TAKEKI , KOIZUMI YOSHIAKI
IPC分类号： G03G9/087 , G03G9/113
摘要： PURPOSE:To enable the formation of images having a high resolution, high image quality and high density by constituting the above developer of a toner formed of a toner consisting of colored particles formed by granulation and polymn. and a carrier having a specific flowability improving agent and a fluorine polymer-contg. layer. CONSTITUTION:The positive-chargeable toner consisting of the colored particles which are obtd. by allowing at least polymerizable monomers and coloring agents to coexist in an aq. medium and granulating and polymerizing the mixture and have 2 to 8mum average grain size is combined with the negative chargeable toner which has a resin coating layer consisting of the highly water- repellent fluorine polymer subjected to a hydrophobing treatment with a silane coupling agent on the surface and added with a negative chargeable flowability improving agent, such as colloidal silica, and has 20 to 80mum average grain size. The good triboelectristatic chargeability of the toner is stably exhibited over a long period of time in this way. The images having the excellent durability, the high resolution and high image quality as well as the high density are thus stably obtd.

5. 发明专利

JPH03290673A ELECTROSTATIC CHARGE IMAGE DEVELOPER 失效
公开(公告)号：JPH03290673A
公开(公告)日：1991-12-20
申请号：JP9224390
申请日：1990-04-09
申请人： KONISHIROKU PHOTO IND
发明人： KOIZUMI YOSHIAKI , TSUJITA KENJI , OKUYAMA TAKEKI , ENDO ISAO
IPC分类号： G03G9/087 , G03G9/113
摘要： PURPOSE:To enable the stable formation of images having high image quality and high resolution many times by constituting the above developer of a toner formed by fixing a flowability improving agent having negative chargeability to the surface of colored particles obtd. by granulation and polymn. and a carrier having a fluorine-contained resin coating layer. CONSTITUTION:The toner is formed by fixing the flowability improving agent having the negative chargeability by repetitive impartation of mechanical impact forces to the surfaces of the colored particles which are obtd. by allowing at least polymerizable monomers and coloring agents to coexist in an aq. medium and granulating and polymerizing the mixture and have 2 to 8mum average grain size. Resin coating layers of a carrier consist of fluorinated alkylacrylate or fluorine-contained resin of methacrylate system polymer are formed on the surfaces of the core particles of the magnetic bodys, such as iron. The above- mentioned toner and carrier are mixed at an adequate ratio, by which the electrostatic charge image developer having positive chargeability applied to a photosensitive body having the negative chargeability is obtd. The high-quality images are thus stably formed many times.

6. 发明专利

JPH03269544A RESIN PARTICLE FOR COATING OF CARRIER FOR ELECTROSTATIC CHARGE IMAGE DEVELOPMENT AND PRODUCTION THEREOF 失效
公开(公告)号：JPH03269544A
公开(公告)日：1991-12-02
申请号：JP6820290
申请日：1990-03-20
申请人： KONISHIROKU PHOTO IND
发明人： KOIZUMI YOSHIAKI , TSUJITA KENJI , KOUNO MASANORI , OMURA TAKESHI
IPC分类号： G03G9/097 , G03G9/113
摘要： PURPOSE:To obtain the improvement in the ductility of a carrier to core material particles, the prevention of splashing and the uniformization of mixing with the core material particles by forming the carrier of porous resin particles which are formed by the fusion of plural resin particles having a specific volume average grain size to each other on the surfaces thereof and have the BET specific surface area and volume average grain size within specific ranges. CONSTITUTION:The resin particles are the porous secondary resin particles which are formed by the fusion of plural primary resin particles having /g and the average volumetric grain size ranging 1.5 to 5.0mum. The resin particles are the porous secondary resin particles which are formed to the larger diameters by the fusion of the plural small-diameter primary resin particles to each other in such a manner and have the BET specific surface area and average volumetric grain size in the above-mentioned rages. The improvement in the ductility of the carrier to the core material particles, the prevention of the splashing and the uniformation of the mixing with the core material particles are obtained in this way.

7. 发明专利

JPH03200158A TONER 失效
公开(公告)号：JPH03200158A
公开(公告)日：1991-09-02
申请号：JP33859089
申请日：1989-12-28
申请人： KONISHIROKU PHOTO IND
发明人： YAJIMA TOSHIKO , TAKAHASHI JIRO , TSUJITA KENJI , UCHIDA MASAFUMI
IPC分类号： G03G9/087 , G03G9/09
摘要： PURPOSE:To restrain tendency to cause straining of a carrier due to carbon black and to form a superior image by using a binder resin made of a cross- linked polyester resin, and the carbon black subjected to oxidation treatment on the surface by ozone and made of furnace carbon black. CONSTITUTION:The furnace carbon black subjected to ozone oxidation treatment on the surface and having a carboxylic group amount of mol/g on the surface is used as the carbon black to remarkably enhance the dispersibility of the carbon black into the cross-linked polyester resin. The carbon black subjected to the ozone oxidation treatment on the surface is improved in fluidity, and the carbon black is uniformly dispersed into the cross- linked polyester, thus permitting the obtained toner not to cause staining of the carrier due to the agglomerates of the carbon black and the durability of the developer to be remarkably enhanced and a superior image to be formed.

8. 发明专利

JPH03179461A ELECTROSTATIC CHARGE IMAGE DEVELOPING CARRIER 失效
公开(公告)号：JPH03179461A
公开(公告)日：1991-08-05
申请号：JP31767989
申请日：1989-12-08
申请人： KONISHIROKU PHOTO IND
发明人： KOUNO MASANORI , OMURA TAKESHI , KOIZUMI YOSHIAKI , TSUJITA KENJI
IPC分类号： G03G9/113
摘要： PURPOSE:To form an image with a carrier high in fluidity without attaching the carrier to a photosensitive body by mixing amorphous magnetic particles with fine coating resin particles and repeatingly applying mechanical impact to this mixture to form the resin coating layer on the surfaces of the amorphous magnetic particles. CONSTITUTION:The amorphous magnetic particles are mixed with the fine resin particles and mechanical impact is repeatedly applied to the mixture to form the resin coating layer on the surfaces of the amorphous magnetic particles, thus permitting the carrier finally obtained to be made amorphous by using the amorphous magnetic particles, and the carrier particles not to attach to the photosensitive body and to have sufficient fluidity, irrespective of their amorphous forms.

9. 发明专利

JPH03144580A CARRIER FOR ELECTROSTATIC DEVELOPMENT AND MANUFACTURE OF THE SAME 失效
公开(公告)号：JPH03144580A
公开(公告)日：1991-06-19
申请号：JP28188989
申请日：1989-10-31
申请人： KONISHIROKU PHOTO IND
发明人： TSUJITA KENJI , KOUNO MASANORI , KOIZUMI YOSHIAKI , OMURA TAKESHI
IPC分类号： G03G9/113 , G03G9/097
摘要： PURPOSE:To improve dispersibility of a magnetic powder and to stabilize triboelectrifiability by fixing fine particles low in surface energy to the surfaces of primary carrier particles of a magnetic powder dispersed type. CONSTITUTION:The fine particles 51 composed of a material low in surface energy are fixed to the surfaces of the primary carrier particles in a state of being partially buried in the surfaces by applying repeating impacts to their mixture. The fine particles are dispersed into a resin in the conventional processes, but in this method, the fine particles low in surface energy are fixed to the surfaces of the primary carrier particles of the magnetic powder dispersed type, thus permitting the carrier to be enhanced in the uniform dispersibility of the magnetic powder by selecting the binder resin of the carrier good in adhesiveness to the magnetic powder, and the triboelectrifiability of the carrier to be sufficiently controlled without being restricted by the fine particles composed of the material low in surface energy.

10. 发明专利

JPH0327115B2 失效
公开(公告)号：JPH0327115B2
公开(公告)日：1991-04-12
申请号：JP3596984
申请日：1984-02-29
申请人： KONISHIROKU PHOTO IND
发明人： SHIRASE AKIZO , TSUJITA KENJI
IPC分类号： G03G15/09 , G03G9/08 , G03G9/083 , G03G9/087 , G03G13/09

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