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公开(公告)号：JP2002265549A
公开(公告)日：2002-09-18
申请号：JP2001061420
申请日：2001-03-06
Applicant: BRIDGESTONE CORP
Inventor： ISHII YORINOBU , NAKAJIMA TADASHI , UENO TETSUKAZU
IPC: F16C13/00 , C08G18/08 , C08G18/09 , C08G101/00
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing an electroconductive polyurethane foam with a good efficiency which is favorable in bubble control, shape and hardness, and is suitable as a material for an image forming device. SOLUTION: In the method, comprises, when foaming and curing a polyurethane molding material containing a polyol component, a polyisocyanate component, a chain-elongating agent and an ion-conductive agent by a one-shot method or a prepolymer method, the ion-conductive agent is used in a form contained in the solution of the chain-elongating agent, and its water content is controlled to be 1.0% by weight or less.
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公开(公告)号：JP2002146065A
公开(公告)日：2002-05-22
申请号：JP2001245287
申请日：2001-08-13
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , MAEDA HIROKO , YAKUSHIJI MANABU , KAWAGOE TAKAHIRO , INOUE KANJI
Abstract: PROBLEM TO BE SOLVED: To obtain an electroconductive member having a slight increase in electric resistance due to continuous turning on of electric current, a small fluctuation range of electric resistance between at low temperature at low humidity and at high temperature at high humidity, suitably useful as a development member and a transcription member in an electrophotographic process. SOLUTION: An electroconductive polymer elastomer or an electroconductive polymer foam material obtained by adding an electroconductive agent to a rubber or a urethane resin is molded into a desired shape, heat-treated and optimized of its electric characteristics to give an electroconductive member having excellent characteristics.
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公开(公告)号：JP2001166586A
公开(公告)日：2001-06-22
申请号：JP35149699
申请日：1999-12-10
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , SAKATA JUNJI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a developer supplying member with which good images may be obtained even if the number of printing sheets is increased in an image forming device of an electrophotographic system or electrostatic recording. SOLUTION: This developer supplying member has at least a surface consisting of a polyurethane foam and is used by coming into contact with a developer. The polyurethane foam is formed of polyol and polyisocyanate as main raw materials and is
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44.发明专利
公开(公告)号：JP2001071336A
公开(公告)日：2001-03-21
申请号：JP25376599
申请日：1999-09-08
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , SAKATA JUNJI
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing an imaging apparatus member comprising a polyurethane foam member and another member in which the polyurethane foam member is formed by a water foaming method in a simplified production process. SOLUTION: In a method for producing an imaging apparatus member comprising a polyurethane foam member and another member, a polyurethane raw material is injected into a form of a size of one polyurethane foam member in which the other member which hinders the progress of the expansion of the polyurethane foam is not arranged is a place in which the progress of the expansion associated with a foaming reaction advances, the foaming reaction and a curing reaction are advanced simultaneously to produce the polyurethane foam member.
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公开(公告)号：JP2001051502A
公开(公告)日：2001-02-23
申请号：JP22669099
申请日：1999-08-10
Applicant: BRIDGESTONE CORP
Inventor： MURATA KAZUYA , NAKAJIMA TADASHI , KAWAGOE TAKAHIRO , OKADA TOKUO
IPC: G03G15/08
Abstract: PROBLEM TO BE SOLVED: To stably increase and keep the quantity of electric charges on a developer by forming an electrostatic charge adjusting layer containing a siloxane crosslinked acrylic resin obtained by crosslinking and hardening an alkoxysilyl-containing acrylic copolymer on the surface of the contact part of a supporting member brought into contact with a developer support. SOLUTION: An electrostatic charge adjusting layer 12 is formed on the surface of the contact part of a supporting member 11 brought into contact with a developer support to obtain the objective developer layer forming member 1. The electrostatic charge adjusting layer 12 is formed using a siloxane crosslinked acrylic resin obtained by crosslinking and hardening an alkoxysilyl-containing acrylic copolymer. By the action of the electrostatic charge adjusting layer 12, the quantity of electric charges on a developer carried on the surface of the developer support is made appropriate, the frictional force of the surface of the contact part of the developer layer forming member 1 is lowered to reduce damage to the developer and the fusion of the developer on the surface of the developer layer forming member 1 is prevented as much as possible. The appropriate quantity of electric charges on the developer is stably kept over a long period of time.
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Patent Agency Ranking
公开(公告)号：JP2001051498A
公开(公告)日：2001-02-23
申请号：JP22668999
申请日：1999-08-10
Applicant: BRIDGESTONE CORP
Inventor： MURATA KAZUYA , NAKAJIMA TADASHI , KAWAGOE TAKAHIRO , OKADA TOKUO
Abstract: PROBLEM TO BE SOLVED: To obtain a developer layer forming member capable of stably increasing and keeping the quantity of electric charges in a developer. SOLUTION: At least the surface of the contact part of the developer layer forming member brought into contact with a developer support is formed with an electrostatic charge adjusting layer 12 containing a polyurea resin obtained by allowing a polyamine compound to react and cure with a polyisocyanate compound. The polyamine compound is a polyether polyamine compound and the polytsocyanate compound is a compound selected from aliphatic, alicyclic and hydrogenated aromatic polyisocyanate compounds or a mixture of two or more such compounds.
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47.发明专利
公开(公告)号：JP2000356905A
公开(公告)日：2000-12-26
申请号：JP16836699
申请日：1999-06-15
Applicant: BRIDGESTONE CORP
Inventor： MURATA KAZUYA , NAKAJIMA TADASHI , KAWAGOE TAKAHIRO , TAKAGI MITSUHARU , ARAI TOSHIAKI
Abstract: PROBLEM TO BE SOLVED: To obtain a forming member of a developer layer which can stably improve and maintain the electrification amount of a developer by forming an electrification controlling layer consisting of a resin prepared by hardening an alcohol-soluble polyamide compound with a phenol compound on at least the contact part of the surface of the forming member for a developer layer with the surface of a developer carrying body. SOLUTION: The forming member of a developer layer has electrification controlling layers 2a to 2c consisting of a resin prepared by hardening a mixture of an alcohol- soluble polyamide compound and a phenol compound on at least the contact part of the surface of the forming member of a developer layer with the surface of a developer carrying body. As for the forming member of a developer layer, for example, the following members are used. They are produced by forming the electrification controlling layer 2a on at least the surface of the supporting member 1a made of a metal or a resin to be in contact with a developer carrying body, or by forming an elastic layer 3b between the electrification controlling layer 2b and the supporting body 1b, or by forming an elastic layer 3c between the supporting member 1c and the electrification controlling layer 2c. Thereby, proper electrification of the developer can be stably maintained for a long time.
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公开(公告)号：JP2000352870A
公开(公告)日：2000-12-19
申请号：JP16382299
申请日：1999-06-10
Applicant: BRIDGESTONE CORP
Inventor： MURATA KAZUYA , NAKAJIMA TADASHI
IPC: G03G15/08
Abstract: PROBLEM TO BE SOLVED: To provide a developer quantity control blade making an excellent image obtainable, and preventing the image defect from occurring even after a printing endurance, even when the image formation processing in the image forming device of an electrophotographic system or an electrostatic recording is made speeding up. SOLUTION: In this developer quantity control blade controlling the developer quantity carried on a periphery of the developer carrier, the developer quantity control blade provided with at least, an elastic body layer on a surface held in contact with the above developer carrier, is making the dynamic loss tangent tanδ at the normal temp. of the elastic body 0.02 to 0.5 at the frequency 0.5 to 19.5 Hz.
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49.发明专利
公开(公告)号：JP2000347514A
公开(公告)日：2000-12-15
申请号：JP15601599
申请日：1999-06-03
Applicant: BRIDGESTONE CORP
Inventor： NAKAJIMA TADASHI , SAKATA JUNJI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain a polymer elastic member which has excellent ozone resistance and which does not cause contamination of a photoreceptor or melt sticking of a toner by incorporating a specified diphenylamine or a diphenylamine derivative. SOLUTION: The polymer elastic member contains a diphenylamine or a diphenylamine derivative expressed by formula I. In formula I, each of A, B, D, E, G, J, L, M, N and P is a hydrogen atom, 1-16C alkyl group or 7-15C aralkyl group. As for the diphenylamine derivative, a compd. expressed by formula II is preferable. In formula II, each of D1 and M1 is a 1-16C alkyl group or 7-15C aralkyl group. As for the polymer elastic material to which the diphenylamine or the diphenylamine derivative is to be added is, for example, solid rubber such as isoprene rubber and butadiene rubber, or polyurethane prepared by hardening a liquid source material such as a polyol with an isocyanate.
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公开(公告)号：JP2000026719A
公开(公告)日：2000-01-25
申请号：JP29315398
申请日：1998-10-15
Applicant: BRIDGESTONE CORP
Inventor： SAKATA JUNJI , NAKAJIMA TADASHI , KAWAGOE TAKAHIRO
IPC: H01B1/20 , C08G18/48 , C08G101/00 , C08K3/22 , C08K5/09 , C08K5/19 , C08L75/08 , G03G15/02 , G03G15/08 , G03G15/16
Abstract: PROBLEM TO BE SOLVED: To obtain an electrically conductive member which is excellent in ozone-resisting, heat-resisting and wet heat-resisting properties, and whose surface does not melt to stain an image-forming article such as a photosensitive article and does not cause a defective image, and to provide an image-forming device equipped with the electrically conductive member. SOLUTION: This electrically conductive member similar to a roller comprises a polyurethane material and has the maximum pulling force value of
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