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公开(公告)号：JP2001139762A
公开(公告)日：2001-05-22
申请号：JP32551499
申请日：1999-11-16
Applicant: BRIDGESTONE CORP
Inventor： TOYOSAWA SHINICHI , NISHIMURO YOICHI , MASHITA NARUHIKO , MACHIDA KUNIO
Abstract: PROBLEM TO BE SOLVED: To obtain a resin composition capable of directly stucking to a metal without using an adhesive by injection molding, and having good adhesion. SOLUTION: This resin composition comprises (a) 100 pts.wt. styrene-based thermoplastic elastomer comprising a block copolymer, (b) 3-50 pts.wt. ethylene-(meth)acrylic acid copolymer or ethylene-(meth)acrylate copolymer, and (c) 50-170 pts.wt. paraffinic oil.
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公开(公告)号：JP2001115141A
公开(公告)日：2001-04-24
申请号：JP29234499
申请日：1999-10-14
Applicant: BRIDGESTONE CORP
Inventor： NISHIMURO YOICHI , TOYOSAWA SHINICHI , MACHIDA KUNIO
Abstract: PROBLEM TO BE SOLVED: To provide a framed gasket reduced in the generation of gases that contaminate a magnetic disc, or the like, during the use of an electronic device without providing the device with any mechanism for gas removal. SOLUTION: In a framed gasket composed of a gasket and a frame integrated therewith, the frame is made from a propylene homopolymer and/or a propylene- based propylene copolymer having an MFR(melt flow rate) of 20 g/10 min or below (at a temperature of 230 deg.C under a load of 2.16 kg (as measured according to JIS K6758), and the gasket is made from an elastomer, and the frame and the gasket are integrated with each other.
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公开(公告)号：JP2001004031A
公开(公告)日：2001-01-09
申请号：JP32820799
申请日：1999-11-18
Applicant: BRIDGESTONE CORP
Inventor： NISHIMURO YOICHI , MACHIDA KUNIO , UTSUNOMIYA TADASHI
Abstract: PROBLEM TO BE SOLVED: To provide desired rigidity, and to provide excellent sealing performance without thickening the total thickness of a gasket by arranging a great part of a core material for holding a gasket shape and reinforcing the gasket in the gasket, and integrating this core material and the gasket. SOLUTION: In this gasket 2 with the whole periphery of its core material 1 covered with an elastic body, rigidity for holding a gasket shape is imparted by the presence of the core material 1, and sufficient sealing performance is obtained without enlarging the total thickness of the gasket 2, that is, an outside diameter. A cross-sectional shape of the gasket 2 may be a shape of an ellipse. The core material 1 may not be positioned in the center of the gasket 2, and a cross-sectional shape of the gasket 2 is desirably a circular shape from the viewpoint of sealing performance. The core material 1 and the gasket 2 are integrated by joining the core material 1 with thermoplastic elastomer by an insert molding method or an extrusion molding method.
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公开(公告)号：JP2000356268A
公开(公告)日：2000-12-26
申请号：JP32820699
申请日：1999-11-18
Applicant: BRIDGESTONE CORP
Inventor： NISHIMURO YOICHI , MACHIDA KUNIO
IPC: F16J15/10
Abstract: PROBLEM TO BE SOLVED: To provide a framed gasket satisfying the rigidity and the sealability and capable of being placed even in a narrow clearance by making a frame body out of a synthetic resin, forming a gasket out of an elastic body, and fixing the gasket to a side surface of the frame body. SOLUTION: A thickness t1 and a width W1 of a frame body, and the total thickness t2 and a width W2 of a gasket are properly determined in consideration of the use of a framed gasket, but the thickness of the frame body is preferably above 0.1 mm to obtain the sufficient rigidity. As a synthetic resin forming the frame body, for example, an acrylonitrile styrene resin and the like can be used. As an elastic body forming the gasket, for example, butyl rubber and the like can be used. By fixing the gasket 2 to the side surface of the frame body 1 in the framed gasket, the framed gasket can be provided with the rigidity enough to hold the shape with the total thickness of the gasket 2, and the gasket can be formed into the desired shape for satisfying the sealability.
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公开(公告)号：JP2000257719A
公开(公告)日：2000-09-19
申请号：JP5833799
申请日：1999-03-05
Applicant: BRIDGESTONE CORP
Inventor： NISHIMURO YOICHI , MACHIDA KUNIO
Abstract: PROBLEM TO BE SOLVED: To improve the mechanical strength and electromagnetic wave shielding property of a gasket, and reduce the weight thereof by unifying a framework made of the synthetic resin with the gasket made of an elastic material and forming a cross section of the frame into a deformed shape. SOLUTION: As the synthetic resin forming a frame 1, a thermoplastic resin such as styrene resin such as acrylonitrile styrene resin, olefin resin such as polyethylene, polyamide resin such as nylon, and polyester resin such as polyethylene terephthalate is used. The frame 1 is formed into a shape having a different cross section in surfaces vertical to the inner periphery and outer periphery of the frame. A gasket with frame is used for bonding surfaces of a cover body 4 and a box body 4. On a point of the electromagnetic shielding property, an H-type frame is desirable. As an elastic body forming the gasket and members, vulcanized rubber and thermoplastic elastomer can be used.
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Patent Agency Ranking
公开(公告)号：JP2000239482A
公开(公告)日：2000-09-05
申请号：JP4840199
申请日：1999-02-25
Applicant: BRIDGESTONE CORP
Inventor： TOYOSAWA SHINICHI , SHIMIZU TAKASHI , NISHIMURO YOICHI , MACHIDA KUNIO
Abstract: PROBLEM TO BE SOLVED: To provide a thermoplastic elastomer composition excellent in sealing properties, prevented from generating a gas of, e.g. a volatile low-molecular component, and suitable for a gasket material, particularly a gasket material for a hard disc device. SOLUTION: The elastomer composition consists of (a) 100 pts.wt. hydrogenated block copolymer obtained by hydrogenating a block copolymer consisting of at least one polymer block comprising mainly an aromatic vinyl compound and at least one polymer block comprising mainly a conjugated diene compound, (b) 50-1,000 pts.wt. non-aromatic softener having a kinematic viscosity at 40 deg.C of 100 mm2/sec or higher, and (c) 1-100 pts.wt. polypropylene homopolymer and/or propylene copolymer comprising mainly propylene, obtained by polymerization in the presence of a metallocene catalyst.
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公开(公告)号：JPH11219084A
公开(公告)日：1999-08-10
申请号：JP2114898
申请日：1998-02-02
Applicant: BRIDGESTONE CORP
Inventor： ISHIKAWA HIKARI , MACHIDA KUNIO , KIKUCHI HIROBUMI
Abstract: PROBLEM TO BE SOLVED: To obtain an elastic member which has proper hardness, hardly flaws an image formation body, and has superior wear resistance and, specially, small compressive and tensile permanent strain by making the elastic member of a cross-linked body obtained by heating and/or irradiating a composition, containing thermoplastic urethane resin and a cross-linking monomer, with an electron beam. SOLUTION: This elastic member is made of the cross-linked body obtained by heating and/or irradiating the composition containing the thermoplastic urethane resin and cross-linking monomer with the electron beam. In this composition, the 0.5 to 40 pts.wt. cross-linking monitor is mixed with the 100 pts.wt. thermoplastic urethane resin. To manufacture this elastic member, the composition containing the thermoplastic urethane resin and cross-linking monomer is prepared. The prepared composition is cross-linked into the elastic member for a cleaning blade, for example, after the composition is united with a support member 2 in a specific shape by a molding method such as injection molding.
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公开(公告)号：JPH10138288A
公开(公告)日：1998-05-26
申请号：JP30999296
申请日：1996-11-05
Applicant: BRIDGESTONE CORP
Inventor： ISHIKAWA HIKARI , MACHIDA KUNIO
Abstract: PROBLEM TO BE SOLVED: To provide a manufacture of an optical plastic article with superior dimensional accuracy even in thick ones by saving the molding period of time in a conventional injection molding method. SOLUTION: The method of manufacturing an optical plastic article comprises the steps of a process A for molding a primary molded article 1 by injection molten resin in the cavity of a mold and a process B for injecting the same resin as in the process A in a part or entire part of the primary molded article 1 and melt-integrating the primary article 1 and injected resin. Herein, the resin is methacryl resin, and a resin temperature to be injected to the primary molded article in the process B is ranged from an injection recommended minimum temperature +5 deg.C to an injection recommended maximum temperature -5 deg.C.
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公开(公告)号：JPH10138284A
公开(公告)日：1998-05-26
申请号：JP30999496
申请日：1996-11-05
Applicant: BRIDGESTONE CORP
Inventor： ISHIKAWA HIKARI , MACHIDA KUNIO
Abstract: PROBLEM TO BE SOLVED: To provide a method of manufacturing an optical plastic molded article with thickness and dimensional precision by shortening the molding period of time with a conventional injection molding method. SOLUTION: The manufacture of an optical plastic article comprises the steps of a process (A) for molding a primary molded article 1 by injecting molten resin in the cavity of a mold, and a process (B) for injecting the same resin as in the process (A) in a part or entire part of the primary molded article 1 and molding a secondary molded article 2 molded by melt-integrating the primary molded article 1 and injected resin. Herein, the primary molded article 1 is cleaned prior to coating resin over the primary molded article 1 in the process (B).
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公开(公告)号：JPH1030682A
公开(公告)日：1998-02-03
申请号：JP20308696
申请日：1996-07-12
Applicant: BRIDGESTONE CORP
Inventor： NISHIMURO YOICHI , MACHIDA KUNIO , MATSUSE TAKAHIRO
IPC: F16F15/12 , C08K7/00 , C08K7/02 , C08L101/00 , F16F15/124 , F16F15/126
Abstract: PROBLEM TO BE SOLVED: To prevent the occurrence of lowering of creep and strength as much as possible, to prevent the generation of noise due to lowering of the creep and the strength, and to effectively reduce the generation of noise. SOLUTION: A boss for damping comprises an outer cylinder body 2; an inner cylinder body 3 disposed inside the outer cylinder body 2; and an elastic substance layer 4 to securely intercouple the outer and inner cylinder bodies 2 and 3. At least one of the outer and inner cylinder bodies 2 and 3 is formed of resin having bend strength of 1,200kg/cm or more, and a modulus in flexure of 40,000kg/cm or more according to JIS K7203 specification.
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