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公开(公告)号：JPH11170826A
公开(公告)日：1999-06-29
申请号：JP33859597
申请日：1997-12-09
Applicant: BRIDGESTONE CORP
Inventor： KOBAYASHI KAZUTOMI , NISHIKAWA TOMOHISA , MATSUO KENJI
Abstract: PROBLEM TO BE SOLVED: To provide a pneumatic tire improving run flat durable performance remarkably higher than that of the conventional run flat tire. SOLUTION: A pair of large thickness rubber strip 8 of crescent-shaped section are provided in an inner surface of a tire 1, and a filler rubber 9 consisting of rubber composition equal to the hard reinforcing rubber strip 8, extended to a position to a tire equator surface from a width end of the minimum width cord layer of a cord crossing layer of a belt 7 from a bead core 5 between turn up/down plies, is provided. In a region surrounded by a straight line in parallel to a tire rotational axial line passing through a maximum width position of a carcass ply and a normal lowered down to the lowermost side turn up ply outer surface from the minimum width cord layer width end, a thickness da of the reinforcing rubber strip 8 measured in a thickness direction of the same position is a thickness db of the filler rubber 9 or more.
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公开(公告)号：JPH05331316A
公开(公告)日：1993-12-14
申请号：JP13904992
申请日：1992-05-29
Applicant: BRIDGESTONE CORP
Inventor： MATSUO KENJI , IWAFUNE SEIICHIRO , SAKIYAMA ATSUSHI , OTA TOSHIYUKI
IPC: B60C11/00 , B60C1/00 , C08K3/00 , C08K3/04 , C08K3/36 , C08K5/00 , C08K5/54 , C08L9/06 , C08L21/00 , C08L57/02
Abstract: PURPOSE:To improve wet performance in high-speed driving. CONSTITUTION:The rubber composition comprises 100 pts.wt. rubber at least 70wt.% of which is a styrene/butadiene rubber (SBR) having a combined styrene content of 25-60%, at least 5 pts.wt. silica having a specific surface area determined by nitrogen adsorption (N2SA) of 130-280m /g, and carbon black having an N2SA of 80m /g or larger, the total amount of the silica and the carbon black being 80-180 pts.wt. It gives a vulcanizate having an extractable content determined with acetone/chloroform of 80 pts.wt. or higher.
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公开(公告)号：JPH059338A
公开(公告)日：1993-01-19
申请号：JP19130691
申请日：1991-07-05
Applicant: BRIDGESTONE CORP
Inventor： MAEDA SHU , MATSUO KENJI
Abstract: PURPOSE:To obtain the title composition improved in grip performance while maintaining abrasion resistance by blending a specific styrene-butadiene copolymer rubber with a petroleum resin in a specific amount. CONSTITUTION:The objective composition containing (A) 100 pts.wt. styrene- butadiene copolymer rubber having 25-60wt.% (preferably
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公开(公告)号：JP2000017588A
公开(公告)日：2000-01-18
申请号：JP12364199
申请日：1999-04-30
Applicant: BRIDGESTONE CORP
Inventor： NISHIKAWA TOMOHISA , MATSUO KENJI , KOBAYASHI KAZUTOMI
Abstract: PROBLEM TO BE SOLVED: To provide pneumatic tires for passenger cars with excellent durability without occurrence of interfacial peeling from the adhesive layer during the car running, particularly in the run-flat driving. SOLUTION: This rubber-steel cord composite material has the rate of the filament area in the cord area in the 15 mm part in the arbitrarily selected cord-axis direction (in other words, the areal share of the filaments in R) is 0.45
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公开(公告)号：JPH11302458A
公开(公告)日：1999-11-02
申请号：JP11557098
申请日：1998-04-24
Applicant: BRIDGESTONE CORP
Inventor： MATSUO KENJI , NISHIKAWA TOMOHISA , KOBAYASHI KAZUTOMI , HOJO MASAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain a composition with improved heat resistance and a tire with improved durability using the same by incorporating a compound having plural ester groups in the molecule and controlling the variation in the dynamic storage modulus of elasticity within a specific temperature range below a specific value. SOLUTION: This composition comprises 100 pts.wt. of a rubber component such as natural rubber, styrene-butadiene rubber or the like, 0.1-20 pts.wt. of at least one compound having at least two ester groups in one molecule selected from di(tetramethylolmethane)pentamethacrylate, di(tetramethylolmethane) trimethacrylate, trimethylolpropane trimethacrylate and the like as a deterioration inhibitor and proper quantities of crosslinking agents, crosslinking accelerators, softening agents, reinforcing fillers or the like, and has a variation in the dynamic storage modulus of elasticity of 3.0 MPa or lower at 170-200 deg.C. This deterioration inhibitor is incorporated into a rubber composition for a rubber reinforcing layer of a side wall portion of a tire or for a bead filler and is effective to improve durability of the side wall portion in particular.
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Patent Agency Ranking
公开(公告)号：JPH11157310A
公开(公告)日：1999-06-15
申请号：JP32453397
申请日：1997-11-26
Applicant: BRIDGESTONE CORP
Inventor： KOBAYASHI KAZUTOMI , NISHIKAWA TOMOHISA , MATSUO KENJI
Abstract: PROBLEM TO BE SOLVED: To provide a pneumatic tire which maintain a feeling of ride under vibration and which has enhanced run-flat durable performance. SOLUTION: A pneumatic tire has a pair of thick, reinforcing rubber strips, whose sectional form is of crescent shape, inside the tire. The tire is provided with an annular projected part, which is on the inner peripheral surface along the outer peripheral part of a flange, leaving a gap between the flange and itself when a carcass is fitted to an application rim so as to bring the internal pressure of the tire to zero. In addition, the form of the innermost carcass ply in the cross section of the tire, compared with the natural, equilibrium form of the innermost carcass ply when the tire is inflated under the pneumatic pressure corresponding to 0.75 to 1.00 times the pneumatic pressure corresponding to the maximum load capacity of the tire, should be as follows: (1) maximum width position M should be located more inside in the radial direction of the tire than the maximum width position Mp of the natural, equilibrium form. (2) for the more outside region in the radial direction of the tire than the maximum width position Mp, position M should be located more inside the tire than position Mp. (3) for the more inside region in the radial direction of the tire than Mp, position M should be located more outside the tire than position Mp.
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公开(公告)号：JPH11129712A
公开(公告)日：1999-05-18
申请号：JP30197197
申请日：1997-11-04
Applicant: BRIDGESTONE CORP
Inventor： NISHIKAWA TOMOHISA , MATSUO KENJI , KOBAYASHI KAZUTOMI
IPC: B60C17/00
Abstract: PROBLEM TO BE SOLVED: To provide a pneumatic safety tire with light weight and remarkably improved in run flat travelling performance while keeping the normal travelling performance in inner pressure filling at a high level. SOLUTION: In a pneumatic safety tire having a pair of right and left bead cores, a carcass layer 2, a belt part, a tread part, and side wall parts 7a, 7b, the flat ratio of the tire is 60% or more, a rubber reinforcing layer 10 is arranged on the inner side of the carcass layer 2 in the side wall parts 7a, 7b, and at least one of rubber filament complexes 8a, 8b having a thickness of 0.05-2.0 mm, comprising a filament fiber having a diameter or the maximum diameter of 0.0001-0.1 mm and a length of 8 mm or more and a rubber component is arranged on the inner side of the rubber reinforcing layers 10a, 10b of the carcass layer 2 in the side wall parts.
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公开(公告)号：JPH06255304A
公开(公告)日：1994-09-13
申请号：JP4886493
申请日：1993-03-10
Applicant: BRIDGESTONE CORP
Inventor： KOJIMA HIROSHI , MITAKE HIDEO , MATSUO KENJI
IPC: B60C9/06
Abstract: PURPOSE:To provide a pneumatic biased tire for racing cart, with which reduction in productivity is minimized while control stability is improved. CONSTITUTION:An inter-ply rubber 24 (the gauge is no smaller than 0.2mm and no larger than 1.0mm: the 100% extension modulus is no smaller than 140% and no larger than 250% of the 100% extension modulus of a carcass coating rubber: the JIS hardness is no smaller than 115% and no larger than 150% of the JIS hardness of a carcass coating rubber) is provided between two-layered carcass ply 16. The inter-pay rubber 24 is extended at least over 60% point of the half width W of the tire tread measured from the tire maximum width point 16C to the side of the tire equatorial surface CL with the end part 26A of the tire tread part 26 serving as a cardinal point. The twisting rigidity of the tread part 26 can thus be improved while the rigidity of the tire side part is improved, and the sense of grip, steering wheel responsibility and the like are also improved.
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公开(公告)号：JPH05214170A
公开(公告)日：1993-08-24
申请号：JP2014692
申请日：1992-02-05
Applicant: BRIDGESTONE CORP
Inventor： SAKIYAMA ATSUSHI , MAEDA SHU , MATSUO KENJI
Abstract: PURPOSE:To provide a tread rubber composition having improved abrasion resistance and road-gripping performance. CONSTITUTION:The objective composition is produced by compounding (A) 100 pts.wt. of a styrene-butadiene copolymer rubber containing 25-60wt.% of styrene component with (B) 10-200 pts.wt. of a resin mixture consisting of a petroleum resin composed mainly of 9C aromatic resin and a coumarone-indene resin having a softening point of
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公开(公告)号：JP2000063573A
公开(公告)日：2000-02-29
申请号：JP15741399
申请日：1999-06-04
Applicant: BRIDGESTONE CORP
Inventor： MATSUO KENJI , HOJO MASAHIRO , NISHIKAWA TOMOHISA , KOBAYASHI KAZUTOMI
Abstract: PROBLEM TO BE SOLVED: To provide a rubber composition having excellent heat-resistance and a pneumatic tire produced by using the composition. SOLUTION: The objective composition satisfies the following condition. In a diagram showing the change of dynamic storage modulus with temperature measured by increasing the temperature, the temperature of the intersection of the extension A of the dynamic storage modulus line before the steep decline of the modulus at a temp. of >=100 deg.C and the extension B of the dynamic storage modulus line of the steeply declining part is >=170 deg.C.
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