JP4763634B2 - Run flat tire - Google Patents
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- JP4763634B2 JP4763634B2 JP2007058714A JP2007058714A JP4763634B2 JP 4763634 B2 JP4763634 B2 JP 4763634B2 JP 2007058714 A JP2007058714 A JP 2007058714A JP 2007058714 A JP2007058714 A JP 2007058714A JP 4763634 B2 JP4763634 B2 JP 4763634B2
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- 229920001971 elastomer Polymers 0.000 claims description 48
- 239000005060 rubber Substances 0.000 claims description 48
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 34
- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 239000005062 Polybutadiene Substances 0.000 claims description 18
- 229920002857 polybutadiene Polymers 0.000 claims description 17
- 239000000377 silicon dioxide Substances 0.000 claims description 17
- 239000013078 crystal Substances 0.000 claims description 16
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 8
- 244000043261 Hevea brasiliensis Species 0.000 claims description 5
- 229920003052 natural elastomer Polymers 0.000 claims description 5
- 229920001194 natural rubber Polymers 0.000 claims description 5
- 229920003049 isoprene rubber Polymers 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 11
- 238000002156 mixing Methods 0.000 description 6
- 239000011324 bead Substances 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VTHOKNTVYKTUPI-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSSCCC[Si](OCC)(OCC)OCC VTHOKNTVYKTUPI-UHFFFAOYSA-N 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- ZARCFEHBDQIZSJ-UHFFFAOYSA-N 1-triethoxysilylpropane-2-thiol Chemical compound CCO[Si](CC(C)S)(OCC)OCC ZARCFEHBDQIZSJ-UHFFFAOYSA-N 0.000 description 1
- JHXWINGYJFCASF-UHFFFAOYSA-N 1-trimethoxysilylpropane-2-thiol Chemical compound CO[Si](OC)(OC)CC(C)S JHXWINGYJFCASF-UHFFFAOYSA-N 0.000 description 1
- KQVVPOMBWBKNRS-UHFFFAOYSA-N 3-(1,3-benzothiazol-2-yl)propyl-triethoxysilane Chemical compound C1=CC=C2SC(CCC[Si](OCC)(OCC)OCC)=NC2=C1 KQVVPOMBWBKNRS-UHFFFAOYSA-N 0.000 description 1
- IABJHLPWGMWHLX-UHFFFAOYSA-N 3-(1,3-benzothiazol-2-yl)propyl-trimethoxysilane Chemical compound C1=CC=C2SC(CCC[Si](OC)(OC)OC)=NC2=C1 IABJHLPWGMWHLX-UHFFFAOYSA-N 0.000 description 1
- DCQBZYNUSLHVJC-UHFFFAOYSA-N 3-triethoxysilylpropane-1-thiol Chemical compound CCO[Si](OCC)(OCC)CCCS DCQBZYNUSLHVJC-UHFFFAOYSA-N 0.000 description 1
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 description 1
- ZZMVLMVFYMGSMY-UHFFFAOYSA-N 4-n-(4-methylpentan-2-yl)-1-n-phenylbenzene-1,4-diamine Chemical compound C1=CC(NC(C)CC(C)C)=CC=C1NC1=CC=CC=C1 ZZMVLMVFYMGSMY-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- 244000055346 Paulownia Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920002589 poly(vinylethylene) polymer Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010059 sulfur vulcanization Methods 0.000 description 1
- JTTSZDBCLAKKAY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSSSCCC[Si](OC)(OC)OC JTTSZDBCLAKKAY-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Description
本発明は、ランフラットタイヤに関する。 The present invention relates to a run flat tire.
近年、タイヤのパンク時においても安全走行を可能とするランフラットタイヤが開発されている。これらは、サイドウォール部に弾性率の高い分厚い補強ゴム層を配置することによって、タイヤパンク時のタイヤの剛性を維持し、繰り返し屈曲変形を受けた場合においてもゴム破損を軽減し、長距離走行を可能にするものである（たとえば、特許文献１参照）。しかし、モジュラスの低いゴムでランフラット走行性を確保するためには、補強ゴム層のボリュームを増やす必要があり、タイヤ重量、発熱の面から好ましくない。 In recent years, run-flat tires have been developed that enable safe driving even when tires are punctured. These have a thick elastic rubber layer with a high modulus of elasticity on the side wall to maintain the rigidity of the tire during tire puncture, reduce rubber damage even when subjected to repeated bending deformation, and run long distances (For example, refer to Patent Document 1). However, in order to ensure run-flat running performance with rubber having a low modulus, it is necessary to increase the volume of the reinforcing rubber layer, which is not preferable in terms of tire weight and heat generation.
また、ゴムの弾性率を高める方法としては、カーボンブラックを増量する方法があるが、発熱しやすくなり、耐久性は低下する。カーボンブラックを増量せずに、シンジオタクチック結晶を含むブタジエンゴムを用いることにより、弾性率の高いゴムが得られ、耐久性が向上する（たとえば、特許文献２参照）。しかし、シンジオタクチック結晶を含むブタジエンゴムをさらに配合すると、引張破断伸びが低下し、耐久性も低下するという問題があった。 Further, as a method of increasing the elastic modulus of rubber, there is a method of increasing the amount of carbon black, but heat is easily generated and durability is lowered. By using a butadiene rubber containing syndiotactic crystals without increasing the amount of carbon black, a rubber having a high elastic modulus is obtained and durability is improved (for example, see Patent Document 2). However, when butadiene rubber containing syndiotactic crystals is further blended, there is a problem that tensile elongation at break is lowered and durability is also lowered.
本発明は、ランフラット走行性、すなわち、タイヤパンク時の走行距離を向上し得るランフラットタイヤを提供することを目的とする。 An object of the present invention is to provide a run-flat tire that can improve the run-flat running performance, that is, the running distance during tire puncture.
すなわち、本発明は、天然ゴムおよび／またはイソプレンゴム２０〜８０重量％、ならびにシンジオタクチック結晶を含むブタジエンゴム２０〜８０重量％からなるゴム成分１００重量部に対して、シリカ１０〜３０重量部を含有するタイヤサイド部補強用ゴム組成物からなる補強ゴム層を有するランフラットタイヤに関する。 That is, the present invention provides 10 to 30 parts by weight of silica with respect to 100 parts by weight of a rubber component composed of 20 to 80% by weight of natural rubber and / or isoprene rubber and 20 to 80% by weight of butadiene rubber containing syndiotactic crystals. The present invention relates to a run-flat tire having a reinforced rubber layer made of a rubber composition for reinforcing a tire side portion.
前記タイヤサイド部補強用ゴム組成物は、さらに、シランカップリング剤を含有することが好ましい。 The tire side portion reinforcing rubber composition preferably further contains a silane coupling agent.
本発明によれば、シンジオタクチック結晶を含むブタジエンゴムとシリカを適量配合することにより、破断伸びを損なうことなく、高弾性率のゴムを得ることができる。さらに、ランフラットタイヤの補強ゴム層に使用すると、ランフラット走行性を向上することができる。 According to the present invention, by blending an appropriate amount of butadiene rubber containing syndiotactic crystals and silica, a rubber having a high elastic modulus can be obtained without impairing elongation at break. Furthermore, when it is used for a reinforcing rubber layer of a run flat tire, run flat running performance can be improved.
本発明のタイヤサイド部補強用ゴム組成物は、ゴム成分およびシリカからなる。 The tire side portion reinforcing rubber composition of the present invention comprises a rubber component and silica.
前記ゴム成分は、天然ゴムおよび／またはイソプレンゴムを２０〜８０重量％、好ましくは２０〜５０重量％、より好ましくは２０〜４０重量％含有する。天然ゴムおよび／またはイソプレンゴムの含有量が２０重量％未満であると加工性に劣り、８０重量％をこえると、耐屈曲亀裂性能に劣る。 The rubber component contains natural rubber and / or isoprene rubber in an amount of 20 to 80% by weight, preferably 20 to 50% by weight, more preferably 20 to 40% by weight. If the content of the natural rubber and / or isoprene rubber is less than 20% by weight, the processability is inferior, and if it exceeds 80% by weight, the flex crack resistance is inferior.
さらに、前記ゴム成分は、シンジオタクチック結晶を含むブタジエンゴムを含有する。ここで、シンジオタクチック結晶とは、たとえば、シンジオタクチック−１，２−ポリブタジエン繊維をいう。シンジオタクチック結晶を含むブタジエンゴムを含有する本発明のゴム組成物を、ランフラットタイヤの補強ゴム層に用いると、ランフラット走行時の耐久性が向上する。 Furthermore, the rubber component contains butadiene rubber containing syndiotactic crystals. Here, the syndiotactic crystal refers to, for example, syndiotactic-1,2-polybutadiene fiber. When the rubber composition of the present invention containing a butadiene rubber containing a syndiotactic crystal is used for a reinforcing rubber layer of a run flat tire, durability during run flat running is improved.
前記ブタジエンゴムのシンジオタクチック結晶含有量は、好ましくは１〜２５％、より好ましくは５〜２０％である。１％未満ではシンジオタクチック成分が少なすぎて充分な剛性が得られない傾向があり、２５％をこえるとシンジオタクチック成分がポリブタジエン中で凝集塊をつくるため、耐久性が低下してしまう。このようなシンジオタクチック結晶を含むポリブタジエンとしては、宇部興産（株）製のＶＣＲ−３０３、４１２、６１７などが入手可能である。 The syndiotactic crystal content of the butadiene rubber is preferably 1 to 25%, more preferably 5 to 20%. If it is less than 1%, there is a tendency that the syndiotactic component is too small and sufficient rigidity cannot be obtained. As polybutadiene containing such a syndiotactic crystal, VCR-303, 412, and 617 manufactured by Ube Industries, Ltd. are available.
前記ブタジエンゴムの含有量は、ゴム成分中に２０〜８０重量％、好ましくは３０〜７０重量％、より好ましくは４０〜７０重量％である。前記ブタジエンゴムの含有量が２０重量％未満では、ランフラット走行性の向上効果が小さく、８０重量％をこえると加工性が著しく低下する。 Content of the said butadiene rubber is 20 to 80 weight% in a rubber component, Preferably it is 30 to 70 weight%, More preferably, it is 40 to 70 weight%. When the content of the butadiene rubber is less than 20% by weight, the effect of improving the run-flat running property is small, and when it exceeds 80% by weight, the workability is remarkably lowered.
前記ゴム成分は、そのほかにも、シンジオタクチック結晶を含まないブタジエンゴムなどを、０〜５０重量％、より好ましくは０〜４０重量％含有することができる。 In addition, the rubber component may contain 0 to 50% by weight, more preferably 0 to 40% by weight, of butadiene rubber not containing syndiotactic crystals.
前述のように、ゴム成分として、シンジオタクチック結晶を含むブタジエンゴムを適量配合すると、ゴムの剛性が上がり、ランフラット走行性が向上する。しかしながら、シンジオタクチック結晶を含むブタジエンゴムをさらに増量すると、剛性は上がるが、ゴムが脆くなり、ランフラット走行性は低下する。そこで、本発明では、シリカを適量添加することにより、引張破断伸びを犠牲にすることなく、剛性を上げ、ランフラット走行性のさらなる向上を図った。 As described above, when an appropriate amount of butadiene rubber containing syndiotactic crystals is blended as the rubber component, the rigidity of the rubber increases and the run-flat running performance is improved. However, when the amount of butadiene rubber containing syndiotactic crystals is further increased, the rigidity is increased, but the rubber becomes brittle and the run-flat running performance is lowered. Therefore, in the present invention, by adding an appropriate amount of silica, the rigidity is increased without sacrificing the tensile elongation at break, and the run-flat running performance is further improved.
シリカとしては、チッ素吸着比表面積（Ｎ2ＳＡ）が５０〜３００ｍ2／ｇのものが好ましく用いられる。シリカのＮ2ＳＡが５０ｍ2／ｇ未満ではシリカの補強効果が得られない傾向があり、３００ｍ2／ｇをこえるとシリカの分散性が低下することで、加工性が低下する傾向がある。 As silica, those having a nitrogen adsorption specific surface area (N 2 SA) of 50 to 300 m 2 / g are preferably used. If the N 2 SA of the silica is less than 50 m 2 / g, the silica reinforcing effect tends not to be obtained, and if it exceeds 300 m 2 / g, the dispersibility of the silica tends to decrease, and the workability tends to decrease.
シリカの含有量は、前記ゴム成分１００重量部に対して、１０〜３０重量部、好ましくは１５〜２５重量部である。シリカの含有量が１０重量部未満では、ランフラット走行性の向上効果が小さく、３０重量部をこえると、ランフラット走行性の向上効果は得られず、混練り工程における加工性が著しく低下する。 The content of silica is 10 to 30 parts by weight, preferably 15 to 25 parts by weight with respect to 100 parts by weight of the rubber component. If the silica content is less than 10 parts by weight, the effect of improving the run-flat running property is small, and if it exceeds 30 parts by weight, the effect of improving the run-flat running property cannot be obtained, and the workability in the kneading process is remarkably lowered. .
本発明のゴム組成物は、さらに、シランカップリング剤を配合することができる。シランカップリング剤としては、たとえば、ビス−（３−トリメトキシシリルプロピル）テトラスルフィド、ビス−（３−トリエトキシシリルプロピル）テトラスルフィド、３−メルカプトプロピルトリメトキシシラン、３−メルカプトプロピルトリエトキシシラン、２−メルカプトプロピルトリメトキシシラン、２−メルカプトプロピルトリエトキシシラン、３−トリメトキシシリルプロピルベンゾチアゾールテトラスルフィド、３−トリエトキシシリルプロピルベンゾチアゾールテトラスルフィドなどがあげられる。 The rubber composition of the present invention can further contain a silane coupling agent. Examples of the silane coupling agent include bis- (3-trimethoxysilylpropyl) tetrasulfide, bis- (3-triethoxysilylpropyl) tetrasulfide, 3-mercaptopropyltrimethoxysilane, and 3-mercaptopropyltriethoxysilane. 2-mercaptopropyltrimethoxysilane, 2-mercaptopropyltriethoxysilane, 3-trimethoxysilylpropylbenzothiazole tetrasulfide, 3-triethoxysilylpropylbenzothiazole tetrasulfide and the like.
シランカップリング剤の配合量は、前記シリカに対して４〜１２重量部、好ましくは５〜１０重量部である。シランカップリング剤の配合量が４重量部未満では配合の効果が小さく、加工性に劣る傾向があり、１２重量部をこえると配合コストが高くなりすぎる傾向がある。 The compounding quantity of a silane coupling agent is 4-12 weight part with respect to the said silica, Preferably it is 5-10 weight part. If the blending amount of the silane coupling agent is less than 4 parts by weight, the blending effect is small and the processability tends to be poor, and if it exceeds 12 parts by weight, the blending cost tends to be too high.
本発明のゴム組成物には、前記ゴム成分、シリカ、シランカップリング剤のほかに、さらにカーボンブラック、硫黄、加硫促進剤、老化防止剤、ステアリン酸、酸化亜鉛などを配合することができる。 In addition to the rubber component, silica, and silane coupling agent, carbon black, sulfur, vulcanization accelerator, anti-aging agent, stearic acid, zinc oxide, and the like can be blended in the rubber composition of the present invention. .
本発明のゴム組成物は、図１に示すように、ランフラットタイヤ１の補強ゴム層８に用いることができる。補強ゴム層８は、サイドウォール部２に配置され、タイヤの剛性を高めるために使用される。補強ゴム層の配置形態としては、具体的には、タイヤカーカスプライ３の内側に接してビード部７からショルダー部にわたって配置され、両端方向に厚さを漸減する三日月状の補強ゴム層８、カーカスプライ本体部分とその折返し部の間にビード部からトレッド部端にわたって配置される補強ゴム層、複数のカーカスプライまたは補強プライの間に配置される２層の補強ゴム層などがあげられる。
The rubber composition of the present invention can be used for the reinforcing
前記補強ゴム層の厚さは、好ましくは５〜３０ｍｍ、より好ましくは８〜２０ｍｍである。補強ゴム層の厚さが５ｍｍ未満では補強ゴム層の剛性が不足しランフラット性能に劣る傾向があり、３０ｍｍをこえるとゴム層が厚くなりすぎ、タイヤ重量が重くなりすぎる傾向がある。 The thickness of the reinforcing rubber layer is preferably 5 to 30 mm, more preferably 8 to 20 mm. If the thickness of the reinforcing rubber layer is less than 5 mm, the rigidity of the reinforcing rubber layer is insufficient and the run-flat performance tends to be inferior. If the thickness exceeds 30 mm, the rubber layer becomes too thick and the tire weight tends to be too heavy.
前記補強ゴム層をサイドウォール部に有する本発明のランフラットタイヤは、ランフラット走行時の耐久性に非常に優れるものである。 The run flat tire of the present invention having the reinforcing rubber layer on the side wall portion is very excellent in durability during run flat running.
以下に、実施例および比較例で用いた材料をまとめて示す。
天然ゴム：ＲＳＳ＃３
シンジオタクチック結晶を含むブタジエンゴム：宇部興産（株）製のＶＣＲ−４１２（シンジオタクチック結晶含量１２％）
ブタジエンゴム：日本ゼオン（株）製のＢＲ１２２０
シリカ：デグッサ社製のＶＮ３（ＣＴＡＢ吸着量：１６５ｍ2／ｇ）
カーボンブラック：昭和キャボット（株）製のＮ５５０（ヨウ素吸着比表面積：４８ｍｇ／ｇ）
シランカップリング剤：デグッサ社製のＳｉ６９（ビス（３−トリエトキシシリルプロピル）テトラスルフィド）
老化防止剤：フレキシス社製のサントフレックス１３
ステアリン酸：日本油脂（株）製の桐
亜鉛華：三井金属鉱業（株）製の酸化亜鉛２種
硫黄：軽井沢硫黄（株）製の粉末硫黄
加硫促進剤：大内新興化学工業（株）製のノクセラーＮＳ
The materials used in the examples and comparative examples are collectively shown below.
Natural rubber: RSS # 3
Butadiene rubber containing syndiotactic crystals: VCR-412 manufactured by Ube Industries, Ltd. (syndiotactic crystal content 12%)
Butadiene rubber: BR1220 manufactured by Nippon Zeon Co., Ltd.
Silica: VN3 manufactured by Degussa (CTAB adsorption amount: 165 m 2 / g)
Carbon black: N550 manufactured by Showa Cabot Co., Ltd. (iodine adsorption specific surface area: 48 mg / g)
Silane coupling agent: Si69 (bis (3-triethoxysilylpropyl) tetrasulfide) manufactured by Degussa
Anti-aging agent: Santoflex 13 manufactured by Flexis
Stearic acid: Paulownia zinc flower manufactured by NOF Corporation: Zinc oxide manufactured by Mitsui Mining & Smelting Co., Ltd. Sulfur: Powdered sulfur vulcanization accelerator manufactured by Karuizawa Sulfur Co., Ltd .: Ouchi Shinsei Chemical Industry Co., Ltd. Noxeller NS made
実施例１〜２および比較例１〜５
表１の配合内容にしたがって、硫黄および加硫促進剤以外の材料を、ＢＲ型バンバリーにてゴム成分、充填剤、薬品の順に混練りした。つぎに、８インチロールで硫黄および加硫促進剤を混合し、１５０℃で３０分間加硫することによりゴム組成物を調製した。得られたゴム組成物について、以下の試験を行なった。結果を表１に示す。
Examples 1-2 and Comparative Examples 1-5
According to the contents of Table 1, materials other than sulfur and a vulcanization accelerator were kneaded in the order of a rubber component, a filler, and a chemical in a BR type Banbury. Next, a rubber composition was prepared by mixing sulfur and a vulcanization accelerator with an 8-inch roll and vulcanizing at 150 ° C. for 30 minutes. The following test was done about the obtained rubber composition. The results are shown in Table 1.
（複素弾性率（Ｅ＊）および損失正接（ｔａｎδ））
（株）岩本製作所粘弾性スペクトロメータを用いて、測定温度７０℃、初期歪み１０％、動歪み±２％、周波数１０Ｈｚの条件で、複素弾性率（Ｅ＊）および損失正接（ｔａｎδ）を測定した。測定したＥ＊およびｔａｎδを、比較例１を１００（基準）として指数で表した。Ｅ＊の指数が大きいほど剛性が高く、良好である。また、ｔａｎδの指数が大きいほど発熱しやすくなり、好ましくない。
(Complex elastic modulus (E *) and loss tangent (tan δ))
Measure complex elastic modulus (E *) and loss tangent (tan δ) under the conditions of measurement temperature 70 ° C, initial strain 10%, dynamic strain ± 2%, frequency 10Hz, using a viscoelasticity spectrometer. did. The measured E * and tan δ were expressed as an index using Comparative Example 1 as 100 (reference). The greater the E * index, the higher the rigidity and the better. Also, the larger the tan δ index, the more easily heat is generated, which is not preferable.
（引張破断伸び）
ＪＩＳ Ｋ ６５２１に準拠して、引張破断伸びを測定した。測定した引張破断伸びを、比較例１を１００（基準）として指数で表した。指数が大きいほど、良好である。測定したｔａｎδを、比較例１を１００（基準）として指数で表した。
(Tensile breaking elongation)
The tensile elongation at break was measured according to JIS K 6521. The measured tensile elongation at break was expressed as an index using Comparative Example 1 as 100 (reference). The larger the index, the better. The measured tan δ was expressed as an index using Comparative Example 1 as 100 (reference).
（ランフラット走行性試験）
タイヤサイズ２２５／６０ＺＲ１６のタイヤを製作し、４９０ｋｇ荷重で２５００ｃｃクラスの車両に４輪装着した。タイヤの構造を図１に示す。空気圧を０にして６０ｋｍ／時間の一定速度で走行し、タイヤ破壊までの走行距離を測定した。走行距離を、比較例１を１００として指数で表わした。指数が大きいほどランフラット走行性が良好である。
(Run flat running test)
Tires with a tire size of 225 / 60ZR16 were manufactured, and four wheels were mounted on a 2500 cc class vehicle with a 490 kg load. The structure of the tire is shown in FIG. The vehicle traveled at a constant speed of 60 km / hour with the air pressure set to 0, and the travel distance until tire destruction was measured. The travel distance was expressed as an index with Comparative Example 1 as 100. The larger the index, the better the run-flat running performance.
特定量のＶＣＲ−４１２（シンジオタクチック結晶を含むブタジエンゴム）およびシリカを配合した実施例１および２では、引張破断伸びを損なうことなく、剛性が向上し、ランフラット走行性が向上した。 In Examples 1 and 2 in which a specific amount of VCR-412 (butadiene rubber containing syndiotactic crystals) and silica were blended, the rigidity was improved and the run-flat running property was improved without impairing the tensile elongation at break.
カーボンブラックを増量することによって、剛性の向上を図った比較例２では、発熱しやすくなり、ランフラット走行性が低下した。 In Comparative Example 2 in which the rigidity was improved by increasing the amount of carbon black, heat was easily generated, and the run-flat running performance was reduced.
ＶＣＲ−４１２を増量することによって、剛性の向上を図った比較例３では、ゴムが脆くなり、ランフラット走行性が低下した。 In Comparative Example 3 in which the rigidity was improved by increasing the amount of VCR-412, the rubber became brittle and the run-flat running performance was reduced.
ＶＣＲ−４１２およびシリカの配合量が少ない比較例４では、ランフラット走行性はほとんど向上しなかった。 In Comparative Example 4 in which the blending amounts of VCR-412 and silica were small, run flat running performance was hardly improved.
特定量のＶＣＲ−４１２は配合されたが、シリカが配合されなかった比較例５では、ランフラット走行性の向上効果は小さかった。 Although the specific amount of VCR-412 was blended, in Comparative Example 5 in which silica was not blended, the effect of improving the run-flat running performance was small.
１ タイヤ
２ サイドウォール部
３ カーカスプライ
４ ベルト層
５ トレッド部
６ ビードコア
７ ビード部
８ 補強ゴム層
９ ビードエーペックス
DESCRIPTION OF
Claims (1)
前記タイヤサイド部補強用ゴム組成物が、さらに、シランカップリング剤を含有するランフラットタイヤ。 Tire side portion containing 10 to 30 parts by weight of silica with respect to 100 parts by weight of rubber component comprising 20 to 80% by weight of natural rubber and / or isoprene rubber and 20 to 80% by weight of butadiene rubber containing syndiotactic crystals A run flat tire having a reinforcing rubber layer made of a reinforcing rubber composition ,
The run-flat tire in which the rubber composition for reinforcing the tire side portion further contains a silane coupling agent .
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| JP2007058714A JP4763634B2 (en) | 2007-03-08 | 2007-03-08 | Run flat tire |
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| JP2007058714A JP4763634B2 (en) | 2007-03-08 | 2007-03-08 | Run flat tire |
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| JP2003309089A Division JP2005075952A (en) | 2003-09-01 | 2003-09-01 | Rubber composition for reinforcement of side part of tire and runflat tire using it |
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| JP2007224305A JP2007224305A (en) | 2007-09-06 |
| JP4763634B2 true JP4763634B2 (en) | 2011-08-31 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011024268A1 (en) * | 2009-08-26 | 2011-03-03 | 株式会社ブリヂストン | Run-flat tire |
| WO2011030431A1 (en) * | 2009-09-10 | 2011-03-17 | 株式会社ブリヂストン | Run-flat tire |
| JP5935243B2 (en) * | 2011-05-31 | 2016-06-15 | 横浜ゴム株式会社 | Rubber composition for run-flat tires |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08324212A (en) * | 1995-05-31 | 1996-12-10 | Toyo Tire & Rubber Co Ltd | Pneumatic tire for heavy load vehicle |
| JPH11240981A (en) * | 1998-02-25 | 1999-09-07 | Toyo Tire & Rubber Co Ltd | Rubber composition for tire bead filler |
| JP3546711B2 (en) * | 1998-08-04 | 2004-07-28 | 東洋ゴム工業株式会社 | Run flat tire |
| JP4535536B2 (en) * | 1999-10-18 | 2010-09-01 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP2002036831A (en) * | 2000-07-21 | 2002-02-06 | Bridgestone Corp | Pneumatic tire |
| JP4490603B2 (en) * | 2000-07-24 | 2010-06-30 | 株式会社ブリヂストン | Pneumatic tire |
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