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1. 发明专利

JPS6021054A PRESSURE FIXABLE MAGNETIC TONER 失效
公开(公告)号：JPS6021054A
公开(公告)日：1985-02-02
申请号：JP12802683
申请日：1983-07-15
申请人： HITACHI METALS LTD , MITSUI PETROCHEMICAL IND
发明人： ASANAE MASUMI , NOGUCHI KOUJI , ITOI HIDEYUKI
IPC分类号： G03G9/083 , G03G9/087 , G03G9/097 , G03G9/08
摘要： PURPOSE:To enhance fixability at low pressure and to improve storage stability at high temp. and resistance to blocking due to vibration by using a specified resin compsn. as a resin component. CONSTITUTION:A resin compsn. used as a resin component is composed of oxidized polyolefin wax (POW) having an oxygen content of >=0.05wt% and higher fatty acid amide, and it has >=80 deg.C softening point and compression yielding value. POW of such oxidized POW used for this compsn. may be homopolymers of ethylene and propylene and copolymers of >=2 kinds of olefin monomers, and addition of oxygen to >=0.005wt% enhances transfer efficiency. The used higher fatty acid amide is in the range of 6-50C, and the used fatty acid is of >=12C, such as lauric acid, and it is, preferably, palmitic acid, etc. The use of such a resin compsn. forms a pressure fixable magnetic toner good in fixability at low pressure and storage stability at high temps. and resistance to blocking due to vibration.

2. 发明专利

JP2001265055A NONMAGNETIC TONER AND METHOD FOR FORMING IMAGE BY USING THE SAME 失效
公开(公告)号：JP2001265055A
公开(公告)日：2001-09-28
申请号：JP2000076820
申请日：2000-03-17
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI
IPC分类号： G03G9/087
摘要： PROBLEM TO BE SOLVED: To improve both of the fixing property and stress resistance in a nonmagnetic single component developer which uses nonmagnetic toner. SOLUTION: The binder resin used in the nonmagnetic toner shows a patter in the distribution of molecular weight based on GPC measurement that at least one peak is present in each range of >=4×104 =7×104 to =12×104 to

3. 发明专利

JP2001255705A NONMAGNETIC SINGLE-COMPONENT DEVELOPER 失效
公开(公告)号：JP2001255705A
公开(公告)日：2001-09-21
申请号：JP2000066191
申请日：2000-03-10
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI
IPC分类号： G03G9/08 , G03G9/097
摘要： PROBLEM TO BE SOLVED: To provide a nonmagnetic single-component developer which shows a short rising time in electrified charges, which causes little fog and which can decrease the amount of the residual developer in a developing zone. SOLUTION: The developer is to be used in a cleanerless system and contains a charge controlling agent embedded in the surface of the toner core containing at least a thermoplastic resin and a coloring agent.

4. 发明专利

JP2000275904A PRODUCTION OF COLORED POLYMERIZED TONER 失效
公开(公告)号：JP2000275904A
公开(公告)日：2000-10-06
申请号：JP8270799
申请日：1999-03-26
申请人： HITACHI METALS LTD
发明人： OCHIAI MASAHISA , ASANAE MASUMI
IPC分类号： G03G9/087
摘要： PROBLEM TO BE SOLVED: To obtain the toner excellent in environmental resistance by stabilizing electrical characteristic. SOLUTION: The producing method of the colored polymerized toner includes a process for suspension granulating a polymerizable monomer mixed liquid containing at least a coloring agent in an aq. medium, a process for polymerizing in the presence of a polymerization initiator and a process for filtering a solution containing the polymerized particles and the polymerized particles are cleaned until the electrical conductivity of a filtrate in a filter process reaches

5. 发明专利

JPH10104884A FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPMENT 失效
公开(公告)号：JPH10104884A
公开(公告)日：1998-04-24
申请号：JP20700697
申请日：1997-08-01
申请人： HITACHI METALS LTD
发明人： OCHIAI MASAHISA , SAITO TSUTOMU , ASANAE MASUMI
IPC分类号： G03G9/10 , G03G9/107 , G03G9/113
摘要： PROBLEM TO BE SOLVED: To ensure high electric charge imparting ability, high stability of a coating layer and a long service life by imparting fine ruggedness to the surfaces of the grains of ferrite particles having a specified compsn. SOLUTION: This ferrite carrier is an Li-Mn ferrite carrier having a basic compsn. consisting of 3-15mol% Li2 O, 5-35mol% MnO and 60-90mol% Fe2 O3 . At least one kind of divalent metal oxide such as NiO or MgO may be substd. for about

6. 发明专利

JPH1039548A FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPMENT AND REVERSAL DEVELOPING METHOD USING SAME 失效
公开(公告)号：JPH1039548A
公开(公告)日：1998-02-13
申请号：JP10774097
申请日：1997-04-24
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI , OCHIAI MASAHISA
IPC分类号： G03G9/107 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a carrier having such electric resistance characteristics as high resistance in a low electric field and low resistance in a high electric field and contg. no harmful material. SOLUTION: This ferrite carrier has a basic compsn. consisting of 2-15mol% Li2 O, 5-30mol% MnO and 60-90mol% Fe2 O3 and is made of ferrite particles having 20-100μm average particle diameter. The ratio (R1 /R2 ) of the volume resistivity (R1 ) of the ferrite particles in an electric field having 200V/cm DC to the volume resistivity (R2 ) of the ferrite particles in an electric field having 10kV/cm DC is >=10 and the resistivity R1 is 1×10 -1×10 Ω.cm.

7. 发明专利

JPH09325611A IMAGE FORMING METHOD 失效
公开(公告)号：JPH09325611A
公开(公告)日：1997-12-16
申请号：JP7874397
申请日：1997-03-31
申请人： HITACHI METALS LTD
发明人： OCHIAI MASAHISA , SAITO TSUTOMU , ASANAE MASUMI
IPC分类号： G03G9/087 , G03G9/10 , G03G15/09
摘要： PROBLEM TO BE SOLVED: To provide an image forming method capable of forming an image of high quality by preventing the sticking of magnetic carriers to the surface of an image carrier. SOLUTION: In this method, the surface of the movably formed image carrier is uniformly electrified by a brush electrifying means and then, has an image exposure, an electrostatic charge image formed on the image carrier is developed with a two-component magnetic developer consisting of the magnetic carriers and toner and the obtained toner image is transferred to a transfer member by a roller transfer means. At this time, as a means for supporting/ carrying the magnetic developer, a permanent magnet member 4 which is provided with plural magnetic poles on the surface and formed into a cylindrical shape and rotatable is used and as the magnetic carrier, one whose volume average grain diameter is 10-15μm, measured magnetization σ1000 in a magnetic field of 1000Oe is >=30emu/g and volume resistivity is 10 -10 Ω.cm is used. As the toner, one incorporating a binder resin consisting of a styrene-acrylic copolymer and/or a polyester resin is used.

8. 发明专利

JPH0990757A IMAGE FORMING METHOD 失效
公开(公告)号：JPH0990757A
公开(公告)日：1997-04-04
申请号：JP24896095
申请日：1995-09-27
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI , OCHIAI MASAHISA
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide an image forming method by which influence on an image resulting from the characteristic fluctuation of a magnetic developer can be decreased. SOLUTION: In an image forming method, a developing roller 4 which is made of a cylindrical permanent magnet member on the surface of which opposite polarity magnetic poles are arranged with equal spacings in a circumference direction is provided so as to face to an image carrier moving as supporting an electrostatic charge image, magnetic developer 2 is absorbed on the developing roll 4, the same is transferred to a developing area formed between the developing roll 4 and the image carrier 7, the electrostatic charge image is developed, and thereafter, the developed toner image is transferred and fixed on to a recording member. A toner friction charge amount in the magnetic developer attracted on the developing roller 4 is measured, and when this measured value becomes a predetermined standard value of the toner friction charge amount or more, a process after the development of the electrostatic charge image is proceeded.

9. 发明专利

JPH0980800A MAGNETISM TONER 失效
公开(公告)号：JPH0980800A
公开(公告)日：1997-03-28
申请号：JP25698895
申请日：1995-09-08
申请人： HITACHI METALS LTD , AREI PURINTA AB
发明人： OCHIAI MASAHISA , ASANAE MASUMI
IPC分类号： G03G9/083 , G03G9/08
摘要： PROBLEM TO BE SOLVED: To improve flowability of a magnetic toner and to always obtain good image density even when lots of images are continuously formed in a direct recording device by specifying the material, particle size and amt. of a flowability improving agent to be externally added to the toner particles which constitute the magnetic toner. SOLUTION: A matrix-type recording electrode 3 having lots of small holes is disposed between a toner carrier 1 and a back electrode 2. A toner is sprayed from the toner carrier 1 to the recording body 4 between the recording electrode 3 and the back electrode 2 according to the voltage applied on the recording electrode 3. The magnetic toner to be used for this direct recording device is produced by externally adding a flowability improving agent to toner particles containing 20-60wt.% magnetic powder in a binder resin. The amt. of the flowability improving agent is 0.1-2 pts.wt. to 100 pts.wt. of the toner particles and the particle size of the agent is specified to 0.005-1.0μm. As for the flowability improving agent, one of SiO2 , TiO2 , Al2 O3 , etc., can be used.

10. 发明专利

JPH08328387A DEVELOPING METHOD 失效
公开(公告)号：JPH08328387A
公开(公告)日：1996-12-13
申请号：JP4973396
申请日：1996-03-07
申请人： HITACHI METALS LTD , HITACHI KINZOKU KIKO KK
发明人： YAMASHITA KEITARO , NOSHIRO TOSHIHIKO , OCHIAI MASAHISA , ASANAE MASUMI
IPC分类号： G03G9/083 , G03G9/10 , G03G15/06 , G03G15/08 , G03G15/09
摘要： PURPOSE: To provide a method for developing capable of obtaining an excellent image without uneven density. CONSTITUTION: As for the developing method for developing the electrostatic charge image, a developing roll 3 composed of cylindrical permanent magnet members arranged on the surface, severally provided with opposite polarity, and arranged in the peripheral direction at the same distance, is disposed opposite to the image carrier 4 moving while carrying the electrostatic charge image, and then the electrostatic charge image is developed by feeding magnetic developer 2 on the surface of developing roll 3, a pitch P between magnetic poles having different polarity is formed at 0.5 to 10mm, the developing roll 3 and the image carrier 4 is moved inversely in a developing area where the developing roll 3 and the image carrier 4 is opposing each other, and the ratio between the peripheral speed Vm (mm/sec) of the developing roll 3 and the moving speed Vp (mm/sec) of the image carrier is made so as to satisfy the next inequality, 5>=Vm/Vp>=1.

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