JPH09241430A - Rubber composition for tire tread - Google Patents
Rubber composition for tire treadInfo
- Publication number
- JPH09241430A JPH09241430A JP8083061A JP8306196A JPH09241430A JP H09241430 A JPH09241430 A JP H09241430A JP 8083061 A JP8083061 A JP 8083061A JP 8306196 A JP8306196 A JP 8306196A JP H09241430 A JPH09241430 A JP H09241430A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- weight
- rubber composition
- resistance
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、タイヤトレッド用
ゴム組成物に関し、特には耐摩耗性を低下させることな
く、破壊特性および湿潤路面における操縦安定性や制動
性（耐ウェットスキッド特性）が著しく向上するととも
に転がり抵抗が低減する、空気入りタイヤのトレッドに
好適に使用することのできるゴム組成物に関する。FIELD OF THE INVENTION The present invention relates to a rubber composition for a tire tread, and in particular, it has a remarkable breaking property, steering stability on wet road surface and braking property (wet skid resistance property) without lowering wear resistance. The present invention relates to a rubber composition which is improved and has reduced rolling resistance, and which can be suitably used for a tread of a pneumatic tire.
【０００２】[0002]
【従来の技術】近年、省資源、省エネルギーの社会的要
請により、自動車の燃料消費を節約するためにタイヤの
転がり抵抗を低減する研究が重要となってきている。タ
イヤの転がり抵抗を小さくすれば、自動車の燃料消費量
が軽減され、いわゆる低燃費タイヤとなることは一般に
知られている。また、タイヤの転がり抵抗を小さくする
には、一般に、タイヤのトレッドゴムにヒステリシスロ
スの小さい材料を用いればよいことも知られている。2. Description of the Related Art In recent years, due to social demands for resource saving and energy saving, research on reducing rolling resistance of tires has become important in order to save fuel consumption of automobiles. It is generally known that if the rolling resistance of a tire is reduced, the fuel consumption of an automobile is reduced and the tire becomes a so-called low fuel consumption tire. It is also known that in order to reduce the rolling resistance of a tire, a material having a small hysteresis loss may be generally used for the tread rubber of the tire.
【０００３】一方、走行安定性の要求からは、湿潤路面
での摩擦抵抗（ウェットスキッド抵抗）の大きいゴム材
料が強く望まれるようになってきた。しかしながら、ウ
ェットスキッド抵抗と上述のタイヤの低転がり抵抗とは
二律背反の関係にあり、両特性を共に満足させることは
非常に困難であった。On the other hand, from the requirement of running stability, a rubber material having a large frictional resistance (wet skid resistance) on a wet road surface has been strongly desired. However, the wet skid resistance and the above-mentioned low rolling resistance of the tire have a trade-off relationship, and it has been extremely difficult to satisfy both characteristics.
【０００４】ところで、最近、タイヤの転がり抵抗およ
びウェットスキッド抵抗とゴム組成物の粘弾性特性との
対応付けが理論的に示された。これによると、タイヤ走
行時の転がり抵抗を小さくするためにトレッドゴムのヒ
ステリシスロスを小さくするには、粘弾性的にはタイヤ
走行時の温度５０〜７０℃における損失正接（ｔａｎ
δ）を低くすることが有効であることが示されている。
この５０〜７０℃の温度におけるｔａｎδを低くする方
法としては、高シスポリブタジエンゴムなどのガラス転
移温度の低い材料や、天然ゴムのように反発弾性の高い
材料を用いることが一般的である。By the way, recently, the correspondence between the rolling resistance and wet skid resistance of a tire and the viscoelastic properties of a rubber composition has been theoretically shown. According to this, in order to reduce the hysteresis loss of the tread rubber in order to reduce the rolling resistance during tire running, viscoelasticity shows that the loss tangent (tan) at a temperature during tire running at 50 to 70 ° C.
It has been shown that lowering δ) is effective.
As a method of lowering tan δ at the temperature of 50 to 70 ° C., it is general to use a material having a low glass transition temperature such as high cis polybutadiene rubber or a material having a high impact resilience such as natural rubber.
【０００５】一方、ウェットスキッド抵抗は、１０〜２
０Ｈｚの周波数下における０℃付近の損失正接と良好に
相関することが知られており、これによると、タイヤの
グリップ性能を改良するには０℃付近の損失正接を大き
くすることが必要である。On the other hand, the wet skid resistance is 10 to 2
It is known that it correlates well with the loss tangent near 0 ° C. under the frequency of 0 Hz, and according to this, it is necessary to increase the loss tangent near 0 ° C. to improve the grip performance of the tire. .
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、５０〜
７０℃の温度におけるｔａｎδを低くするのに有効なガ
ラス転移温度の低い材料や反発弾性の高い材料のゴムで
はウェットスキッド抵抗が極端に低下することになり、
よって、従来技術では走行安定性と低転がり抵抗とを両
立させることが著しく困難であることが理論的にも裏付
けられていた。However, 50-
Wet skid resistance is extremely reduced in rubber of a material having a low glass transition temperature and a material having high impact resilience, which is effective in lowering tan δ at a temperature of 70 ° C.,
Therefore, it has been theoretically proved that it is extremely difficult to achieve both running stability and low rolling resistance in the prior art.
【０００７】そこで、本発明の目的は、従来理論的にも
困難とされていた問題を克服し、耐摩耗特性を低下させ
ることなく、破壊特性および耐ウェットスキッド特性を
著しく向上させるとともに、転がり抵抗を低減させるこ
とのできる空気入りタイヤトレッド用ゴム組成物を提供
することにある。Therefore, an object of the present invention is to overcome the problems that have been theoretically difficult in the past, to significantly improve the fracture resistance and the wet skid resistance without lowering the wear resistance, and to improve the rolling resistance. It is intended to provide a rubber composition for a pneumatic tire tread capable of reducing the above.
【０００８】[0008]
【課題を解決するための手段】本発明のタイヤトレッド
用ゴム組成物は、ハロゲン化ブチルゴムを２０〜８０重
量％と、ポリイソプレンゴムおよび／または天然ゴム２
０〜８０重量％と、その他のジエン系ゴム５０重量％以
下とからなるゴム成分１００重量部に対して、カーボン
ブラック２０〜６０重量部と、アルキルフェノールジサ
ルファイド０．５〜２．０重量部とを配合してなること
を特徴とするものである。The rubber composition for a tire tread of the present invention comprises a halogenated butyl rubber of 20 to 80% by weight, a polyisoprene rubber and / or a natural rubber 2
20 to 60 parts by weight of carbon black and 0.5 to 2.0 parts by weight of alkylphenol disulfide with respect to 100 parts by weight of a rubber component consisting of 0 to 80% by weight and 50% by weight or less of other diene rubber. It is characterized by being mixed.
【０００９】前記ハロゲン化ブチルゴムは、イソモノオ
レフィンとｐ−アルキルスチレンとからなる共重合体を
ハロゲン化してなる変性共重合体であることが好まし
い。The halogenated butyl rubber is preferably a modified copolymer obtained by halogenating a copolymer of isomonoolefin and p-alkylstyrene.
【００１０】[0010]
【発明の実施の形態】本発明のゴム組成物のゴム成分と
して使用するハロゲン化ブチルゴムは、ブロモブチルゴ
ム、分岐ブロモブチルゴム、イソモノオレフィンとｐ−
アルキルスチレンとからなる共重合体をハロゲン化して
なる変性共重合体等が挙げられ、好ましくは上述のよう
にイソモノオレフィンとｐ−アルキルスチレンとからな
る共重合体をハロゲン化、特には臭素化または塩素化し
てなる変性共重合体である。具体的には、イソモノオレ
フィンがイソブチレン、ｐ−アルキルスチレンがｐ−メ
チルスチレンで、共重合体の変性に使用するハロゲン原
子が臭素あるいは塩素である変性共重合体を挙げること
ができる。BEST MODE FOR CARRYING OUT THE INVENTION The halogenated butyl rubber used as the rubber component of the rubber composition of the present invention includes bromobutyl rubber, branched bromobutyl rubber, isomonoolefin and p-
Examples thereof include modified copolymers obtained by halogenating a copolymer composed of alkylstyrene, and preferably halogenated, particularly brominated, a copolymer composed of isomonoolefin and p-alkylstyrene as described above. Alternatively, it is a chlorinated modified copolymer. Specific examples thereof include a modified copolymer in which isomonoolefin is isobutylene, p-alkylstyrene is p-methylstyrene, and a halogen atom used for modifying the copolymer is bromine or chlorine.
【００１１】また、本発明のゴム組成物に使用するその
他のジエン系ゴムとしては、ブタジエンゴム、スチレン
ブタジエン共重合体ゴム、アクリロニトリル−ブタジエ
ン共重合体ゴム、エチレンプロピレン共重合体ゴム（Ｅ
ＰＭ）およびＥＰＭにジエンモノマーを加えて三元共重
合体としたゴム（ＥＰＤＭ）等を挙げることができる。Other diene rubbers used in the rubber composition of the present invention include butadiene rubber, styrene-butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber, ethylene-propylene copolymer rubber (E
Examples thereof include rubber (EPDM) which is a terpolymer obtained by adding a diene monomer to PM) and EPM.
【００１２】本発明においては、ゴム成分のうち、上記
ハロゲン化ブチルゴムが２０〜８０重量％占めることを
要する。２０重量％未満ではｔａｎδ（０℃）が低く、
ウェットスキッド性能に劣り、一方、８０重量％超過で
は破壊強度および耐摩耗性能に劣り、またｔａｎδ（５
０℃）が高く低転がり抵抗性が低下する。In the present invention, the halogenated butyl rubber is required to account for 20 to 80% by weight of the rubber component. If it is less than 20% by weight, tan δ (0 ° C) is low,
Wet skid performance is inferior, while when it exceeds 80% by weight, fracture strength and wear resistance are inferior, and tan δ (5
(0 ° C.) is high and the rolling resistance is low.
【００１３】また、本発明のゴム組成物には、架橋剤の
一部として、ゴム成分１００重量部に対して０．５〜
２．０重量部のアルキルフェノールジサルファイドを用
いることを特徴の一つとする。この配合量が０．５重量
部未満では破壊特性、耐摩耗性に対する改良効果が小さ
く、一方２．０重量部を超えると加工性が悪くなる。The rubber composition of the present invention contains 0.5 to 100 parts by weight of the rubber component as a part of the crosslinking agent.
One of the features is that 2.0 parts by weight of alkylphenol disulfide is used. If the amount is less than 0.5 parts by weight, the effect of improving fracture characteristics and wear resistance is small, while if it exceeds 2.0 parts by weight, workability becomes poor.
【００１４】さらに、本発明のゴム組成物にはゴム成分
１００重量部に対して２０〜６０重量部のカーボンブラ
ックを用いる。この配合量が２０重量部未満では、加硫
物の耐摩耗性、破壊特性が十分でなく、一方、６０重量
部を超えると、低ヒステリシスロス特性が低下する。Further, 20 to 60 parts by weight of carbon black is used for 100 parts by weight of the rubber component in the rubber composition of the present invention. If the blending amount is less than 20 parts by weight, the vulcanizate has insufficient abrasion resistance and fracture properties, while if it exceeds 60 parts by weight, the low hysteresis loss property is deteriorated.
【００１５】本発明のゴム組成物は、上述のアルキルフ
ェノールジサルファイドやカーボンブラック以外に、酸
化防止剤、亜鉛華、ステアリン酸、加硫促進剤、加硫剤
などを適宜配合して使用される。The rubber composition of the present invention is used by appropriately blending an antioxidant, zinc white, stearic acid, a vulcanization accelerator, a vulcanizing agent and the like in addition to the above-mentioned alkylphenol disulfide and carbon black.
【００１６】[0016]
【実施例】次に、本発明を実施例および比較例により具
体的に説明する。実施例および比較例で用いたハロゲン
化ブチルゴムである臭素化ブチルゴム（Br-IIR）、イソ
モノオレフィンとｐ−メチルスチレン（ＰＭＳ）とから
なる共重合体を臭素化してなる変性共重合体（商品名：
Exxpro90-10およびExxpro93-5）のＰＭＳ濃度および臭
素濃度を下記の表１に示す。EXAMPLES Next, the present invention will be specifically described with reference to Examples and Comparative Examples. Brominated butyl rubber (Br-IIR), which is a halogenated butyl rubber used in Examples and Comparative Examples, and a modified copolymer obtained by brominating a copolymer of isomonoolefin and p-methylstyrene (PMS) (commercial product). Name:
The PMS concentration and bromine concentration of Exxpro90-10 and Exxpro93-5) are shown in Table 1 below.
【００１７】[0017]
【表１】 [Table 1]
【００１８】さらに、実施例および比較例で共通して用
いた、ゴム成分とカーボンブラック以外の配合剤のゴム
成分１００重量部に対する配合量を下記の表２に示す。Further, the compounding amounts of the compounding agents other than the rubber component and carbon black, which are commonly used in Examples and Comparative Examples, are shown in Table 2 below with respect to 100 parts by weight of the rubber component.
【００１９】[0019]
【表２】 ＊１：Ｎ−（１，３−ジメチルブチル）−Ｎ’−フェニ
ル−ｐ−フェニレンジアミン ＊２：ジフェニルグアニジン[Table 2] * 1: N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine * 2: Diphenylguanidine
【００２０】上記表２並びに下記の表３および表４に示
す配合処方に従いゴム組成物を調製した。また、得られ
たゴム組成物について１４５℃×３３分の条件下で加硫
を行い、加硫物のｔａｎδ値、破壊特性および耐摩耗性
を評価をした。評価方法は下記の通りである。Rubber compositions were prepared according to the compounding recipes shown in Table 2 above and Tables 3 and 4 below. Further, the obtained rubber composition was vulcanized under the conditions of 145 ° C. for 33 minutes, and the tan δ value, fracture characteristics and abrasion resistance of the vulcanized product were evaluated. The evaluation method is as follows.
【００２１】（イ）低ヒステリシスロス特性（ｔａｎδ
（５０℃）） 米国レオメトリックス社製の動的スペクトロメータを使
用し、５０℃にて動的剪断歪み（振幅１．０％、周波数
１５Ｈｚ）を与えてｔａｎδ値を測定し、これの逆数を
比較例８における値を１００として指数表示した。従っ
て、数値が大きい程ヒステリシスロスが小さく良好であ
ることを示す。 （ロ）耐ウエットスキッド特性（ｔａｎδ（０℃）） ０℃にて上記と同様にｔａｎδ値を測定し、比較例８に
おける値を１００として指数表示した。従って、数値が
大きい程耐ウエットスキッド特性に優れていることを示
す。 （ハ）破壊特性 ＪＩＳ Ｋ−６３０１に準拠して測定した。 （ニ）耐摩耗性 ランボーン摩耗法により測定した。負荷荷重が２．０ｋ
ｇ、室温におけるスリップ率２５％における摩耗量を測
定し、それらの逆数を用いて、比較例８における値を１
００として指数表示した。従って、数値が大きい程耐摩
耗性が良好であることを示す。得られた結果を下記の表
３および表４に併記する。(A) Low hysteresis loss characteristic (tan δ
(50 ° C.) Using a dynamic spectrometer manufactured by Rheometrics Co., USA, dynamic shear strain (amplitude 1.0%, frequency 15 Hz) is applied at 50 ° C. to measure the tan δ value, and the reciprocal of this value is calculated. The value in Comparative Example 8 was set as 100 and displayed as an index. Therefore, the larger the value, the smaller the hysteresis loss and the better. (B) Wet skid resistance property (tan δ (0 ° C.)) The tan δ value was measured at 0 ° C. in the same manner as above, and the value in Comparative Example 8 was set to 100 and displayed as an index. Therefore, the larger the value, the better the wet skid resistance. (C) Destruction characteristics It was measured according to JIS K-6301. (D) Abrasion resistance It was measured by the Lambourn abrasion method. 2.0k load
g, the wear amount at a slip ratio of 25% at room temperature was measured, and the reciprocal thereof was used to calculate the value in Comparative Example 8 as 1.
The index was indicated as 00. Therefore, the larger the value, the better the wear resistance. The obtained results are also shown in Tables 3 and 4 below.
【００２２】[0022]
【表３】 [Table 3]
【００２３】[0023]
【表４】 ＊Ｓ−ＳＢＲは結合スチレン含量＝２０重量％、ビニル
結合含量＝７０重量％（ブタジエン中）の溶液重合スチ
レンブタジエンゴムである。[Table 4] * S-SBR is a solution-polymerized styrene-butadiene rubber having a bound styrene content of 20% by weight and a vinyl bond content of 70% by weight (in butadiene).
【００２４】各実施例ではいずれも、摩耗特性を損なう
ことなく、破壊特性および耐ウェットスキッド特性が大
きく向上し、また低ヒステリシスロス特性を実現するこ
とができた。In each of the examples, the fracture characteristics and the wet skid resistance characteristics were greatly improved, and the low hysteresis loss characteristics could be realized without impairing the wear characteristics.
【００２５】これに対し、比較例１のように、ハロゲン
化ブチルゴムを所定量より多く用いた場合、破壊特性が
大きく低下し、また摩耗特性及び低ヒステリシスロス特
性も低下し、好ましくない。On the other hand, when the halogenated butyl rubber is used in a larger amount than the predetermined amount as in Comparative Example 1, the breaking property is greatly deteriorated, and the wear property and the low hysteresis loss property are also deteriorated, which is not preferable.
【００２６】また、比較例３〜５のように、ハロゲン化
ブチルゴムを極端に少なくした場合、耐ウェットスキッ
ド特性が低下してしまい、好ましくない。Further, when the halogenated butyl rubber is extremely reduced as in Comparative Examples 3 to 5, the wet skid resistance is deteriorated, which is not preferable.
【００２７】さらに、比較例２のように、加硫剤として
のアルキルフェノールジサルファイドが所定量を下まわ
る場合、破壊特性および耐摩耗性が低下し、好ましくな
い。Further, as in Comparative Example 2, when the amount of the alkylphenol disulfide as the vulcanizing agent is less than the predetermined amount, the breaking property and the abrasion resistance are deteriorated, which is not preferable.
【００２８】さらにまた、比較例６のようにカーボンブ
ラックを極端に少なくした場合、破壊特性および耐摩耗
性が大幅に低下し、好ましくない。Furthermore, when the carbon black is extremely reduced as in Comparative Example 6, the fracture characteristics and the wear resistance are significantly reduced, which is not preferable.
【００２９】さらにまた、比較例７のようにカーボンブ
ラックを極端に多くした場合、低ヒステリシスロス特性
が低下し、好ましくない。Further, when carbon black is excessively increased as in Comparative Example 7, the low hysteresis loss characteristic is deteriorated, which is not preferable.
【００３０】[0030]
【発明の効果】以上説明したように、本発明によると、
耐摩耗特性を低下させることなく、破壊特性および耐ウ
ェットスキッド特性を著しく向上させるとともに、転が
り抵抗を低減させることのできる空気入りタイヤトレッ
ド用ゴム組成物を提供することができる。As described above, according to the present invention,
It is possible to provide a rubber composition for a pneumatic tire tread capable of significantly improving the fracture property and the wet skid resistance property and reducing the rolling resistance without lowering the wear resistance property.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｌ 7/00 ＫＣＴ Ｃ０８Ｌ 7/00 ＫＣＴ 23/28 ＬＤＡ 23/28 ＬＤＡ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication C08L 7/00 KCT C08L 7/00 KCT 23/28 LDA 23/28 LDA
Claims (2)
％と、ポリイソプレンゴムおよび／または天然ゴム２０
〜８０重量％と、その他のジエン系ゴム５０重量％以下
とからなるゴム成分１００重量部に対して、カーボンブ
ラック２０〜６０重量部と、アルキルフェノールジサル
ファイド０．５〜２．０重量部とを配合してなることを
特徴とするタイヤトレッド用ゴム組成物。1. 20 to 80% by weight of halogenated butyl rubber, polyisoprene rubber and / or natural rubber 20
20 to 60 parts by weight of carbon black and 0.5 to 2.0 parts by weight of alkylphenol disulfide with respect to 100 parts by weight of a rubber component composed of -80% by weight and 50% by weight or less of other diene rubber. A rubber composition for a tire tread, characterized by being blended.
オレフィンとｐ−アルキルスチレンとからなる共重合体
をハロゲン化してなる変性共重合体である請求項１記載
のタイヤトレッド用ゴム組成物。2. The rubber composition for a tire tread according to claim 1, wherein the halogenated butyl rubber is a modified copolymer obtained by halogenating a copolymer composed of isomonoolefin and p-alkylstyrene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08306196A JP3594154B2 (en) | 1996-03-13 | 1996-03-13 | Rubber composition for tire tread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08306196A JP3594154B2 (en) | 1996-03-13 | 1996-03-13 | Rubber composition for tire tread |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09241430A true JPH09241430A (en) | 1997-09-16 |
| JP3594154B2 JP3594154B2 (en) | 2004-11-24 |
Family
ID=13791682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08306196A Expired - Fee Related JP3594154B2 (en) | 1996-03-13 | 1996-03-13 | Rubber composition for tire tread |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3594154B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6201054B1 (en) | 1998-01-14 | 2001-03-13 | Sumitomo Rubber Industries, Ltd. | Rubber composition for tire tread |
| KR20010111538A (en) * | 2000-06-12 | 2001-12-19 | 김선태 | A Rail Pad Composition |
| US6672350B2 (en) | 2001-09-06 | 2004-01-06 | The Goodyear Tire & Rubber Company | Tire with shock absorbing configured rubber tread |
| JP2009084426A (en) * | 2007-09-28 | 2009-04-23 | Tokai Rubber Ind Ltd | Vibration insulating rubber composition and vibration insulating rubber using the same |
| JP2010059398A (en) * | 2008-08-08 | 2010-03-18 | Sumitomo Rubber Ind Ltd | Rubber composition for cap tread and tire having cap tread comprising the same |
-
1996
- 1996-03-13 JP JP08306196A patent/JP3594154B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6201054B1 (en) | 1998-01-14 | 2001-03-13 | Sumitomo Rubber Industries, Ltd. | Rubber composition for tire tread |
| KR20010111538A (en) * | 2000-06-12 | 2001-12-19 | 김선태 | A Rail Pad Composition |
| US6672350B2 (en) | 2001-09-06 | 2004-01-06 | The Goodyear Tire & Rubber Company | Tire with shock absorbing configured rubber tread |
| JP2009084426A (en) * | 2007-09-28 | 2009-04-23 | Tokai Rubber Ind Ltd | Vibration insulating rubber composition and vibration insulating rubber using the same |
| JP2010059398A (en) * | 2008-08-08 | 2010-03-18 | Sumitomo Rubber Ind Ltd | Rubber composition for cap tread and tire having cap tread comprising the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3594154B2 (en) | 2004-11-24 |
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