JP3184249B2 - Rubber composition for tire tread - Google Patents

Rubber composition for tire tread

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Publication number
JP3184249B2
JP3184249B2 JP16243291A JP16243291A JP3184249B2 JP 3184249 B2 JP3184249 B2 JP 3184249B2 JP 16243291 A JP16243291 A JP 16243291A JP 16243291 A JP16243291 A JP 16243291A JP 3184249 B2 JP3184249 B2 JP 3184249B2
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Japan
Prior art keywords
weight
parts
bound
rubber
sbr
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Japanese (ja)
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JPH04359938A (en
Inventor
健司 伊藤
尚伸 野口
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Bridgestone Corp
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Bridgestone Corp
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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明はタイヤトレッド用ゴム組
成物に関し、特に路面との高い摩擦力を低温から高温に
至るまでの広い温度範囲に亘り保持し得るタイヤトレッ
ド用ゴム組成物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition for a tire tread, and more particularly to a rubber composition for a tire tread capable of maintaining a high frictional force with a road surface in a wide temperature range from a low temperature to a high temperature. is there.

【０００２】[0002]

【従来の技術】従来より、空気入りタイヤにおいてグリ
ップ性能等、路面との高い摩擦力を得るためには、トレ
ッド用ゴム組成物として、変形時にヒステリシスロスの
大きいスチレン−ブタジエン共重合体ゴム（以下ＳＢＲ
と略記する）が使用されている。また、このＳＢＲ中の
結合スチレン含有量または結合ビニル含有量を増すこと
により、ゴム組成物に大きなヒステリシスロスを与える
ことができることが知られている。更に、低温時にゴム
が硬化して摩擦力が低下するのを防ぐためには、天然ゴ
ム（以下ＮＲと略記する）またはブタジエンゴム（Ｂ
Ｒ）を少量配合すればよいことも知られている。更にま
た、高いグリップ性能を有するようにするために、多量
のカーボンブラックやオイルを配合した、いわゆるハイ
オイル−ハイカーボンブラック系がトレッド用ゴムとし
て通常用いられている。2. Description of the Related Art Conventionally, in order to obtain a high frictional force with a road surface such as grip performance in a pneumatic tire, a styrene-butadiene copolymer rubber (hereinafter, referred to as a rubber composition for tread) having a large hysteresis loss during deformation has been used. SBR
Abbreviated). Further, it is known that a large hysteresis loss can be given to the rubber composition by increasing the bound styrene content or the bound vinyl content in the SBR. Further, in order to prevent the rubber from hardening at a low temperature and reducing the frictional force, natural rubber (hereinafter abbreviated as NR) or butadiene rubber (B
It is also known that a small amount of R) may be blended. Furthermore, in order to have high grip performance, a so-called high oil-high carbon black system containing a large amount of carbon black or oil is usually used as a tread rubber.

【０００３】[0003]

【発明が解決しようとする課題】しかし、従来は、ＳＢ
Ｒ単独の改良で路面との高い摩擦力を得ようとした場
合、冬場の低温時にトレッドゴムが硬化してしまい摩擦
力が低下してしまった。また、かかる低温時に高い摩擦
力を保持しようとして、トレッド用ゴム組成物にＮＲま
たはＢＲを配合し、これらによる軟化効果を維持させる
と、逆に夏場の高温時に摩擦力の低下、耐破壊物性の低
下、あるいはゴム組成物の温度依存性の改良効果が少な
くなる等の問題を生じた。However, conventionally, SB
When an attempt was made to obtain a high frictional force with the road surface by improving R alone, the tread rubber was hardened at a low temperature in winter, and the frictional force was reduced. Also, in order to maintain a high frictional force at such a low temperature, NR or BR is blended with the rubber composition for a tread to maintain the softening effect by these. There are problems such as a decrease or an effect of improving the temperature dependency of the rubber composition.

【０００４】特に、タイヤと路面との摩擦を限界まで高
めた状態で使用される高性能空気入りタイヤでは、夏冬
のレベル差を如何に小さくするかが重要な問題であっ
た。そこで本発明の目的は、タイヤの諸性能の低下を来
たすことなく、低温から高温に至るまでの広い温度範囲
に亘り路面との高い摩擦力を保持し得るタイヤトレッド
用ゴム組成物を提供することにある。[0004] In particular, in a high performance pneumatic tire used in a state where the friction between the tire and the road surface is increased to the limit, it is an important problem how to reduce the level difference between summer and winter. Therefore, an object of the present invention is to provide a rubber composition for a tire tread that can maintain a high frictional force with a road surface over a wide temperature range from low to high without causing deterioration of various performances of the tire. It is in.

【０００５】[0005]

【課題を解決するための手段】本発明者らは上記課題を
解決すべく鋭意検討した結果、特定のカーボンブラック
と伸展油を所定量配合する、いわゆるハイカーボンブラ
ック−ハイオイル配合系において、比較的結合スチレン
量が多くかつ比較的結合ビニル量の少ないＳＢＲと比較
的結合スチレン量が少なくかつ比較的結合ビニル量の多
いＳＢＲとの組み合わせ、あるいは比較的結合スチレン
量が多くかつ比較的結合ビニル量の多いＳＢＲと比較的
結合スチレン量が少なくかつ比較的結合ビニル量の少な
いＳＢＲとの組み合わせを用いることで、２つの異なる
粘弾性挙動の性質にて弾性率の温度依存性を少なくし、
これにより低温時および高温時における湿潤または乾燥
路面において高い摩擦力を保持することができ、すなわ
ち摩擦力の夏冬における性能の変化を抑制することがで
き、またこの際、従来のＮＲ−ＳＢＲ配合系またはＢＲ
−ＳＢＲ配合系とは異なりポリマー相の破壊特性を大幅
に損うことはないことを見い出し、本発明を完成するに
至った。Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, in a so-called high carbon black-high oil blending system in which a specific amount of specific carbon black and extender oil are blended. Of SBR having a relatively large amount of bound styrene and having a relatively small amount of bound vinyl and SBR having a relatively small amount of bound styrene and having a relatively large amount of bound vinyl, or a relatively large amount of bound styrene and having a relatively large amount of bound vinyl By using a combination of SBR having a large amount of SBR and a SBR having a relatively small amount of bound styrene and a relatively small amount of bound vinyl, the temperature dependence of the elastic modulus is reduced by two different viscoelastic properties,
As a result, a high frictional force can be maintained on a wet or dry road surface at low and high temperatures, that is, a change in the frictional force in summer and winter can be suppressed, and at this time, the conventional NR-SBR compound System or BR
It has been found that unlike the -SBR compound system, the fracture characteristics of the polymer phase are not significantly impaired, and the present invention has been completed.

【０００６】すなわち本発明は、結合スチレン量が30〜
60重量％で結合ビニル量が15重量％以下のＳＢＲ（Ａ）
30重量部以上と、結合スチレン量が25重量％以下で結合
ビニル量が20〜70重量％のＳＢＲ（Ｂ）30重量部以上と
を含み、（Ａ）と（Ｂ）の合計量が80重量部以上のゴム
成分100 重量部に対して、窒素吸着比表面（以下Ｎ2 Ｓ
Ａと略記する）が100 〜350 m2／ｇでジブチルフタレー
ト吸油量（以下ＤＢＰ吸油量と略記する）が100 〜170
ml／100 ｇであるカーボンブラック60〜150 重量部およ
び伸展油40〜180 重量部を配合して成るタイヤトレッド
用ゴム組成物に関するものである。That is, in the present invention, the amount of bound styrene is 30 to
SBR (A) with 60% by weight and bound vinyl content of 15% by weight or less
30 parts by weight or more, and 30 parts by weight or more of SBR (B) having an amount of bound styrene of 25% by weight or less and an amount of bound vinyl of 20 to 70% by weight, and the total amount of (A) and (B) is 80% by weight. Parts or more of the rubber component and 100 parts by weight of the nitrogen adsorption ratio surface (hereinafter referred to as N 2 S
A) is 100 to 350 m 2 / g and the dibutyl phthalate oil absorption (hereinafter abbreviated as DBP oil absorption) is 100 to 170.
The present invention relates to a rubber composition for a tire tread comprising 60 to 150 parts by weight of carbon black (ml / 100 g) and 40 to 180 parts by weight of an extension oil.

【０００７】また本発明は、結合スチレン量が30〜60重
量％で結合ビニル量が20〜70重量％のＳＢＲ（Ａ′）30
重量部以上と、結合スチレン量が25重量％以下で結合ビ
ニル量が15重量％以下のＳＢＲ（Ｂ′）30重量部以上と
を含み、（Ａ′）と（Ｂ′）の合計量が80重量部以上の
ゴム成分100 重量部に対して、Ｎ2 ＳＡが100 〜350m2
／ｇでＤＢＰ吸油量が100 〜170 ml／100 ｇであるカー
ボンブラック60〜150重量部および伸展油40〜180 重量
部を配合して成るタイヤトレッド用ゴム組成物に関する
ものである。Further, the present invention relates to an SBR (A ') 30 having a bound styrene content of 30 to 60% by weight and a bound vinyl content of 20 to 70% by weight.
Parts by weight, and 30 parts by weight or more of SBR (B ') having an amount of bound styrene of 25% by weight or less and an amount of bound vinyl of 15% by weight or less, and the total amount of (A') and (B ') is 80%. N 2 SA is 100 to 350 m 2 with respect to 100 parts by weight or more of the rubber component by weight.
The present invention relates to a rubber composition for a tire tread comprising 60 to 150 parts by weight of carbon black having a DBP oil absorption of 100 to 170 ml / 100 g and 40 to 180 parts by weight of an extension oil.

【０００８】尚、本発明の上記２種類のいずれのゴム組
成物においても通常用いられている充填剤、例えば軟化
剤、加硫剤、加硫促進剤、加硫促進助剤、老化防止剤
等、必要に応じて適宜必要量配合することができるのは
勿論のことである。[0008] Incidentally, fillers usually used in any of the above two rubber compositions of the present invention, such as softeners, vulcanizing agents, vulcanization accelerators, vulcanization accelerators, antioxidants and the like. Needless to say, a necessary amount can be appropriately added as required.

【０００９】[0009]

【作用】本発明の上記２種類のタイプのゴム組成物にお
いては、本発明で規定するＳＢＲをゴム成分として80重
量部以上含有する必要があり、好ましくは90〜100 重量
とする。また、本発明の各タイプのゴム組成物に各々使
用されるＳＢＲ（Ａ），ＳＢＲ（Ａ′）は共に30重量部
以上、好ましくは40〜70重量部配合することを必要とす
る。かかる配合量が30重量部より少ない場合には、乾燥
路面において、夏場のように比較的温度が高い場合に高
い摩擦力が得られない。一方、70重量部を超えて配合す
ると、冬場のように比較的低温時において硬化が著し
く、摩擦力の著しい低下を来たすことになる。The above two types of rubber compositions of the present invention must contain at least 80 parts by weight, preferably 90 to 100 parts by weight, of the SBR specified in the present invention as a rubber component. Further, it is necessary that both SBR (A) and SBR (A ') used in each type of rubber composition of the present invention be blended in an amount of 30 parts by weight or more, preferably 40 to 70 parts by weight. If the amount is less than 30 parts by weight, a high frictional force cannot be obtained on a dry road surface when the temperature is relatively high as in summer. On the other hand, if it is added in an amount exceeding 70 parts by weight, curing is remarkable at a relatively low temperature such as in winter, resulting in a remarkable decrease in frictional force.

【００１０】更にまた、本発明の各タイプのゴム組成物
に各々使用されるＳＢＲ（Ｂ），ＳＢＲ（Ｂ′）につい
ても30重量部以上、好ましくは30〜60重量部配合するこ
とを必要とする。かかる配合量が30重量部よりも少ない
と、低温時の軟化効果が十分ではなく、著しく路面との
摩擦力を低下させてしまうことになり、一方60重量部を
超えて配合すると、高温時にヒステリシスロスが低下
し、路面との間で高い摩擦力を得ることがでくなくなっ
てしまう。尚、本発明の２種のタイプのゴム組成物はＳ
ＢＲ（Ａ）とＳＢＲ（Ｂ）との組み合わせ、あるいはＳ
ＢＲ（Ａ′）とＳＢＲ（Ｂ′）との組み合わせの場合に
限り本発明の目的を達成することができ、他の組み合わ
せではかかる目的を達成することはできない。この理由
については未だ十分に解明されていない。Furthermore, it is necessary that SBR (B) and SBR (B ') used in each type of the rubber composition of the present invention be blended in an amount of 30 parts by weight or more, preferably 30 to 60 parts by weight. I do. If the amount is less than 30 parts by weight, the softening effect at low temperatures is not sufficient, and the frictional force with the road surface is significantly reduced.On the other hand, if the amount exceeds 60 parts by weight, the hysteresis at high temperatures is reduced. Loss is reduced, and it becomes impossible to obtain a high frictional force with the road surface. The two types of rubber compositions of the present invention are S
Combination of BR (A) and SBR (B) or S
The object of the present invention can be achieved only in the case of the combination of BR (A ') and SBR (B'), and the object cannot be achieved in other combinations. The reason for this has not yet been fully elucidated.

【００１１】本発明の２種のタイプのゴム組成物には、
いずれもＮ2 ＳＡが100 〜350 m2／ｇでＤＢＰが100 〜
170 ml／100 ｇであるカーボンブラックをゴム成分100
重量部に対して60〜150 重量部配合することを必要とす
る。かかるカーボンブラックが上記範囲内で配合されな
い場合には、本発明で目的とする高グリップ性能が得ら
れないか、あるいは耐熱性、耐摩耗性等のタイヤ性能が
低下するため、好ましくない。また、同様の理由から、
石油系軟化剤、エステル系可塑剤等の伸展油をゴム成分
100 重量部に対して40〜180 重量部配合することを必要
とする。尚、好ましい伸展油としては芳香族系軟化剤が
挙げられる。[0011] The two types of rubber compositions of the present invention include:
In each case, N 2 SA is 100 to 350 m 2 / g and DBP is 100 to
170 ml / 100 g of carbon black is added to rubber component 100
It is necessary to mix 60 to 150 parts by weight with respect to parts by weight. If such carbon black is not blended in the above range, the high grip performance intended in the present invention cannot be obtained or the tire performance such as heat resistance and abrasion resistance deteriorates, which is not preferable. Also, for similar reasons,
Extending oils such as petroleum softeners and ester plasticizers as rubber components
It is necessary to add 40 to 180 parts by weight to 100 parts by weight. A preferred extender oil is an aromatic softener.

【００１２】[0012]

【実施例】次に本発明を実施例により更に具体的に説明
する。下記の表１に、本実施例で使用した各種ＳＢＲの
ミクロ構造として、各構成単位の割合（重量％）を示
す。尚、かかるＳＢＲの構造決定は赤外分光光度計を用
いて行い、結合スチレン量についてはハンプトン法によ
り、また結合ビニル量についてはモレロ法により求め
た。表１中のＳＢＲのミクロ構造の割合は結合スチレン
量＋結合ビニル量＋結合シス量＋結合トランス量＝ 100
（重量％）とした場合によるものである。Next, the present invention will be described more specifically with reference to examples. Table 1 below shows the ratio (% by weight) of each structural unit as the microstructure of the various SBRs used in this example. The structure of SBR was determined using an infrared spectrophotometer. The amount of bound styrene was determined by the Hampton method, and the amount of bound vinyl was determined by the Morello method. The ratio of the SBR microstructure in Table 1 is the amount of bound styrene + the amount of bound vinyl + the amount of bound cis + the amount of bound trans = 100
(% By weight).

【００１３】 [0013]

【００１４】表１に示す各種ＳＢＲ，あるいはＮＲやＢ
Ｒを用いて表２および表３に示す種々の配合系のゴム組
成物を調製し、これらゴム組成物の加硫ゴム物性、およ
びこれらゴム組成物をトレッドに用いて試作したサイズ
２０５／６０Ｒ１５のタイヤの夏場と冬場における運動
性能を測定した。測定方法は下記の通りである。Various SBR, NR and B shown in Table 1
Using R, rubber compositions of various compounding systems shown in Tables 2 and 3 were prepared, and the vulcanized rubber properties of these rubber compositions and the size 205 / 60R15 of a prototype produced using these rubber compositions as treads were prepared. The exercise performance of tires in summer and winter was measured. The measuring method is as follows.

【００１５】加硫物性 ＪＩＳ Ｋ ６３０１に準拠して測定した。運動性能 Ｓ−μトレーラを使用し、荷重320 kgf 、空気圧2.2 kg
／cm2 、速度60km／時、アスファルト路面の条件にてス
ライドμを測定し、比較例１の乾燥および湿潤路面各々
における夏場の値を100 として指数表示した。指数が大
きい程、結果は良好である。 Vulcanized physical properties Measured according to JIS K 6301. Motion performance Using S-μ trailer, load 320 kgf, air pressure 2.2 kg
/ Cm 2, rate of 60 km / time, the slide μ measured by the asphalt road surface conditions, an index on a summer values in the dry and wet road surface of each of Comparative Example 1 as 100. The higher the index, the better the result.

【００１６】[0016]

【表２】 [Table 2]

【００１７】[0017]

【表３】 [Table 3]

【００１８】表２および表３から明らかなように、実施
例のタイヤトレッド用ゴム組成物はいずれも比較例のゴ
ム組成物と比較して引張り強さが損われることがなく、
夏場−冬場を通して乾燥および湿潤路面に付して共に良
好な運動性能を示した。このことから、本発明のトレッ
ド用ゴム組成物を用いると温度変化に対して路面との摩
擦力の変化が少ないことが分かる。尚、上記運動性能と
して、乾燥および湿潤路面において夏場または冬場の指
数が95以上であり、かつ夏−冬の差が５以内であること
が望ましい。すなわち、指数が95未満では運動性能が絶
対レベルとして不足し、また夏−冬の差が５を超えると
フィーリング評価として夏−冬において明確な差が現れ
てしまうためである。As is clear from Tables 2 and 3, the rubber compositions for tire treads of the examples did not lose the tensile strength as compared with the rubber compositions of the comparative examples.
Both summer and winter showed good athletic performance on dry and wet road surfaces. This indicates that the use of the tread rubber composition of the present invention causes little change in frictional force with the road surface with respect to temperature change. In addition, as the exercise performance, it is desirable that the index in summer or winter is 95 or more on a dry and wet road surface, and the difference between summer and winter is 5 or less. That is, when the index is less than 95, the exercise performance is insufficient as an absolute level, and when the difference between summer and winter exceeds 5, a clear difference appears between summer and winter as feeling evaluation.

【００１９】[0019]

【発明の効果】以上説明してきたように本発明のタイヤ
トレッド用ゴム組成物においては、ハイカーボンブラッ
ク−ハイオイル配合系において、比較的結合スチレン量
が多くかつ比較的結合ビニル量の少ないＳＢＲと比較的
結合スチレン量が少なくかつ比較的結合ビニル量の多い
ＳＢＲとの組み合わせ、あるいは比較的結合スチレン量
が多くかつ比較的結合ビニル量の多いＳＢＲと比較的結
合スチレン量が少なくかつ比較的結合ビニル量の少ない
ＳＢＲとの組み合わせを用いたことにより、タイヤの諸
性能の低下を来たすことなく、低温から高温に至るまで
の広い温度範囲に亘り路面との高摩擦力を保持すること
が可能となった。As described above, in the rubber composition for a tire tread of the present invention, in a high carbon black-high oil blended system, SBR having a relatively large amount of bound styrene and a relatively small amount of bound vinyl is used. A combination with SBR having a relatively small amount of bound styrene and a relatively large amount of bound vinyl, or an SBR having a relatively large amount of bound styrene and a relatively large amount of bound vinyl and a SBR having a relatively small amount of bound styrene and a relatively small amount of bound vinyl By using a combination with a small amount of SBR, it is possible to maintain high frictional force with the road surface over a wide temperature range from low to high temperatures without deteriorating tire performance. Was.

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 結合スチレン量が30〜60重量％で結合ビ
ニル量が15重量％以下のスチレン−ブタジエン共重合体
ゴム（Ａ）30重量部以上と、結合スチレン量が25重量％
以下で結合ビニル量が20〜70重量％のスチレン−ブタジ
エン共重合体ゴム（Ｂ）30重量部以上とを含み、（Ａ）
と（Ｂ）の合計量が80重量部以上のゴム成分100 重量部
に対して、窒素吸着比表面が100 〜350 m2／ｇでジブチ
ルフタレート吸油量が100 〜170 ml／100 ｇであるカー
ボンブラック60〜150 重量部および伸展油40〜180 重量
部を配合して成るタイヤトレッド用ゴム組成物。1. A styrene-butadiene copolymer rubber (A) having a bound styrene content of 30 to 60% by weight and a bound vinyl content of 15% by weight or less, and a bound styrene content of 25% by weight.
A styrene-butadiene copolymer rubber (B) having a bound vinyl content of 20 to 70% by weight or less, and (A)
Carbon having a nitrogen adsorption specific surface of 100 to 350 m 2 / g and a dibutyl phthalate oil absorption of 100 to 170 ml / 100 g with respect to 100 parts by weight of a rubber component having a total amount of 80 parts by weight or more and (B). A rubber composition for a tire tread, comprising 60 to 150 parts by weight of black and 40 to 180 parts by weight of an extension oil. 【請求項２】 結合スチレン量が30〜60重量％で結合ビ
ニル量が20〜70重量％のスチレン−ブタジエン共重合体
ゴム（Ａ′）30重量部以上と、結合スチレン量が25重量
％以下で結合ビニル量が15重量％以下のスチレン−ブタ
ジエン共重合体ゴム（Ｂ′）30重量部以上とを含み、
（Ａ′）と（Ｂ′）の合計量が80重量部以上のゴム成分
100 重量部に対して、窒素吸着比表面が100 〜350 m2／
ｇでジブチルフタレート吸油量が100 〜170 ml／100ｇ
であるカーボンブラック60〜150重量部および伸展油40
〜180 重量部を配合して成るタイヤトレッド用ゴム組成
物。2. A styrene-butadiene copolymer rubber (A ') having a bound styrene content of 30 to 60% by weight and a bound vinyl content of 20 to 70% by weight, and a bound styrene content of 25% by weight or less. A styrene-butadiene copolymer rubber (B ') having a bound vinyl content of 15% by weight or less,
A rubber component whose total amount of (A ') and (B') is 80 parts by weight or more
For 100 parts by weight, the nitrogen adsorption specific surface is 100 to 350 m 2 /
g of dibutyl phthalate oil absorption is 100-170 ml / 100g
60 to 150 parts by weight of carbon black and extender oil 40
A rubber composition for a tire tread, which comprises about 180 parts by weight.
JP16243291A 1991-06-07 1991-06-07 Rubber composition for tire tread Expired - Lifetime JP3184249B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16243291A JP3184249B2 (en) 1991-06-07 1991-06-07 Rubber composition for tire tread

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16243291A JP3184249B2 (en) 1991-06-07 1991-06-07 Rubber composition for tire tread

Publications (2)

Publication Number Publication Date
JPH04359938A JPH04359938A (en) 1992-12-14
JP3184249B2 true JP3184249B2 (en) 2001-07-09

Family

ID=15754503

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16243291A Expired - Lifetime JP3184249B2 (en) 1991-06-07 1991-06-07 Rubber composition for tire tread

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Country Link
JP (1) JP3184249B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6635713B1 (en) * 1999-05-28 2003-10-21 Zeon Corporation Rubber composition, resin modifier comprising the same, and resin composition
KR20040003996A (en) * 2002-07-05 2004-01-13 금호타이어 주식회사 Tread rubber composition improved snow traction
JP5291858B2 (en) * 2004-03-16 2013-09-18 株式会社ブリヂストン Rubber composition and pneumatic tire using the same
BR112015009244A2 (en) * 2012-10-24 2017-08-22 Michelin Rech Tech SBR WITH HIGH STYRENE CONTENT IN RUBBER COMPOSITIONS
JP6172307B1 (en) 2016-02-04 2017-08-02 横浜ゴム株式会社 Rubber composition for tire

Also Published As

Publication number Publication date
JPH04359938A (en) 1992-12-14

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