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91.发明专利
公开(公告)号：JP2001166561A
公开(公告)日：2001-06-22
申请号：JP34895699
申请日：1999-12-08
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , KAWAGOE TAKAHIRO , YAGUCHI HITOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacture which is capable of cost effectively executing small-volume production of many kinds of image forming device members in manufacture of the image forming device members consisting of polyurethane foam members and another members. SOLUTION: This method for manufacturing the image forming device members consisting of the polyurethane foam members and another members comprises casting the polyurethane raw material previously foamed into forms having a size for one component of the polyurethane foam members and progressing a curing reaction, thereby manufacturing the polyurethane foam members.
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公开(公告)号：JP2001051500A
公开(公告)日：2001-02-23
申请号：JP22740299
申请日：1999-08-11
Applicant: BRIDGESTONE CORP
Inventor： MURATA KAZUYA , NAKAJIMA TADASHI
Abstract: PROBLEM TO BE SOLVED: To obtain a blade for regulating the amount of a developer capable of attaining sufficient electrostatic charge of a developer and capable of therefore giving stable image quality even when image forming processing is speeded up and an image is made colored in an image forming device using an electrophotographic system or electrostatic recording. SOLUTION: The blade for regulating the amount of a developer regulates the amount of a developer carried on the peripheral surface of a developer support and has an elastic body layer on at least the surface brought into contact with the developer support. The elastic body layer comprises a polyurethane elastomer using a polyolefinic polyol having a number average molecular weight of 500-10,000 as a reactive component.
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公开(公告)号：JP2000327910A
公开(公告)日：2000-11-28
申请号：JP14291599
申请日：1999-05-24
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , SAKATA JUNJI , YAMADA TSUTOMU , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain an electroconductive polyurethane member having a low hardness without fouling a photoreceptor and without fusing to a toner, remarkably reduced in positional dispersion of electrical resistance and voltage dependence and suitable as a member for an apparatus for forming images. SOLUTION: This electroconductive polyurethane member comprises a polyurethane having electroconductivity. In the electroconductive polyurethane member, the polyurethane comprises a nonelectroconductive absorbent substance and the amount Z [wt.%] of the formulated nonelectroconductive oil absorbent substance satisfies 0.1X
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公开(公告)号：JP2000154228A
公开(公告)日：2000-06-06
申请号：JP28347999
申请日：1999-10-04
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , TAKAGI MITSUHARU , KANEDA HIROSHI , KAWAGOE TAKAHIRO , SAWA EIJI
Abstract: PROBLEM TO BE SOLVED: To suitably use an elastic material as an electroconductive roller for electrophotography without generating reduction of its performance by elevation or change of a resistance value even when turning on electricity for a long time. SOLUTION: An elastic material of electrically semiconductive polymer uses a foam of foaming polyurethane as a base material wherein the electric resistance is 1×105 to 1×1010 [Ωcm] at a measured voltage of 1,000 V under a condition of 28 deg.C and at 85% relative humidity; the electric resistance is less than 5 times of the initial one when continuously turning on electricity for 8 hr under the same condition; and further the electric resistance at the measured voltage of 10 V under conditions of the same temperature/humidity is not more than 2 times of that at the measured voltage of 5,000 V.
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公开(公告)号：JPH1124450A
公开(公告)日：1999-01-29
申请号：JP17847497
申请日：1997-07-03
Applicant: BRIDGESTONE CORP
Inventor： SAKATA JUNJI , NAKAJIMA TADASHI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain an electrically conductive elastic member excellent in ozone resistance, having high mechanical strength even by production by a one-shot method, also having relatively low hardness and suitable for use as a transfer roll in an electrophotographic device, etc. SOLUTION: The electrically conductive elastic member is produced using an electrically conductive material contg. polyurethane foam obtd. using condensed polyester polyol, an electric conductivity imparting agent and a silicone foam regulating agent having the polyether part in which the ratio between oxyethylene units and oxypropylene units is 80:20 to 100:0 and/or a polyethylene glycol type nonionic surfactant.
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Patent Agency Ranking
公开(公告)号：JPH1121445A
公开(公告)日：1999-01-26
申请号：JP17845997
申请日：1997-07-03
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , SAKATA JUNJI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain an electroconductive material used in mechanisms of electrophotographic device, etc., having small increments of electrical resistance in conventional continuous electrification, small fluctuation of electrical resistance between conditions of low temperature, low humidity and high temperature, high humidity and provide an electrophotographic device using thereof. SOLUTION: The electroconductive materials utilize materials comprising (A) polyurethane foam or polyurethane elastomer obtained by using one or two or more kinds of polyisocyanates selected from carbodiimide modified diphenylmethanediisocyanate, glycol modified diphenylmethanediisocyanate and isocyanulate modified diphenylmethanediisocyanate, as the polyisocyanate component, (B) electro conductivity imparting agents consisting of quaternary ammonium salts such as quaternary ammonium salts of alkylsulfuric acids, quaternary ammonium salts of carboxylic acids, etc.
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公开(公告)号：JPH10247021A
公开(公告)日：1998-09-14
申请号：JP10871698
申请日：1998-04-03
Applicant: BRIDGESTONE CORP
Inventor： TAKAGI MITSUHARU , KANEDA HIROSHI , NAKAJIMA TADASHI , KAWAGOE TAKAHIRO
IPC: G03G15/16
Abstract: PROBLEM TO BE SOLVED: To excellently and surely perform transfer operation over long term without increasing the resistance value of a transfer member even in the case of repeating the transfer operation for a long time by impressing a current so that the positive and negative polarities of a DC current flowing in the transfer member may be inverted by a specified charge amount in every specified interval in the midst of a transfer cycle. SOLUTION: In the case of impressing the DC current between the transfer member and transfer paper so that a series of transfer operation may be performed, the positive and negative polarities of the impressed DC current are inverted by the specified charge amount at the specified interval for a specified time by a proper current inverting means. In such a case, it is desirable to set the integrated value of the current in a direction reverse to a direction where the transfer paper is electrified to have the specified polarity for the purpose of transfer, that is, a reverse direction integrated current value to 25-175% of the integrated current value in a forward direction where the transfer paper is electrified to have the specified polarity. Namely, resistance rising rate due to impressing the voltage is expressed as the function of the impressed integrated current value, whereby the rising of the resistance value of a conductive member is restrained by performing the transfer operation in the cycle where the reverse direction integrated current value required to restrain the rising of the resistance is impressed.
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公开(公告)号：JPH0987354A
公开(公告)日：1997-03-31
申请号：JP24783095
申请日：1995-09-26
Applicant: BRIDGESTONE CORP
Inventor： YAKUSHIJI MANABU , SAWA EIJI , KANEDA HIROSHI , NAKAJIMA TADASHI , MAEDA HIROKO , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain a conductive member which can be used for a mechanism of, e.g. electrophotography capable of sufficiently withstanding the heat generated when a high voltage is applied for a long time by using a polyurethane containing a specified polyether polyol as the polyol component. SOLUTION: In a conductive member used for a mechanism of, e.g. electrophotography, the member is made of a polyurethane containing a polyether polyol being a random glycerol/ethylene oxide/propylene oxide adduct as the polyol component. It is necessary that the conductive member used for the above object should have a specified electrical resistance, should sufficiently withstand the heat generated when a high voltage is applied for a long time, should not suffer from the contamination of the photoreceptor with especially the decomposition product of the polymeric member, and should not cause a change in electrical resistance. The conductive member can satisfy all of these requirements because the polyol component of the polyurethane contains both ethylene oxide and propylene oxide.
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公开(公告)号：JPH0854770A
公开(公告)日：1996-02-27
申请号：JP16846794
申请日：1994-07-20
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , MASUDA YOSHITOMO , KAWAGOE TAKAHIRO
IPC: G03G15/02
Abstract: PURPOSE:To provide a member for an electrifying device having serveral good characteristics by resolving the shortcoming of the conventional member for an electrifying device. CONSTITUTION:As for this member for the electrifying device, its electric resistance is to 1X10 OMEGAcm within a range where measured voltage is 10-5000V on a condition that temperature is 15-32.5 deg.C and relative humidity is 10-85%, the positional dispersion of the electric resistance is
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公开(公告)号：JPH0850420A
公开(公告)日：1996-02-20
申请号：JP20600994
申请日：1994-08-08
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , TAKAGI MITSUHARU , KAWAGOE TAKAHIRO
Abstract: PURPOSE:To use for an image forming device to obtain good images. CONSTITUTION:This transferring device or developing device is equipped with a transfer member 4 or developing member 3 and with a power supply for the transfer device or a power supply for the developing device which detects environmental conditions and/or load and controls the conditions of the power supply. The transfer member or the developing member contains a semiconducting polymer material as the structural element on which bias voltage can be applied. The semiconducting polymer material is prepared by adding an electron accepting material which can produce charge-transfer complexes to a polymer material as the base material. Or the transferring device or the developing device is equipped with a transfer member 4 or a developing member 3 and with a const. current power supply for the transferring device or const. current power supply for the developing device. The transfer member 4 of the developing member 3 contains a semiconducting polymer material as the structural element on which bias voltage can be applied. The semiconducting polymer material is prepared by adding an electron accepting material which can form charge-transfer complexes to a polymer material as the base material.
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