JP2009102506A - Rubber composition for tire and pneumatic tire - Google Patents

Rubber composition for tire and pneumatic tire Download PDF

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JP2009102506A
JP2009102506A JP2007275179A JP2007275179A JP2009102506A JP 2009102506 A JP2009102506 A JP 2009102506A JP 2007275179 A JP2007275179 A JP 2007275179A JP 2007275179 A JP2007275179 A JP 2007275179A JP 2009102506 A JP2009102506 A JP 2009102506A
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rubber
weight
tire
parts
rubber composition
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JP5079447B2 (en
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Kazuya Hirabayashi
和也 平林
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber composition for tire capable of preventing the occurrence of rubber powder on a surface of tread after running without impairing running performance to improve its appearance and performance and to provide a pneumatic tire using the rubber composition. <P>SOLUTION: This rubber composition for tire is constituted by blending silica of 20-100 pts.wt., carbon black of 0-100 pts.wt., silane coupling agent of 1-20 pts.wt., and denatured silicone phenol resin of 1-20 pts.wt. with a diene rubber component of 100 pts.wt. containing solution polymerization styrene butadiene rubber having glass transition temperature of -40°C or more of 50 pts.wt. or more. This pneumatic tire is constituted by using this rubber composition in its tread. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ゴム組成物及び空気入りタイヤに関し、より詳しくは、グリップ性、操縦安定性などの走行性能を損なうことなく走行後のトレッド表面のゴム粒の発生を抑え、外観性能を向上することができるタイヤ用ゴム組成物及びそのゴム組成物をトレッドゴムに用いた空気入りタイヤに関する。   The present invention relates to a rubber composition and a pneumatic tire, and more specifically, to suppress the generation of rubber particles on the tread surface after traveling without impairing traveling performance such as grip performance and steering stability, and to improve appearance performance. The present invention relates to a rubber composition for a tire and a pneumatic tire using the rubber composition for a tread rubber.

高速走行で使用される高性能タイヤには、ドライ及びウェット路面でのグリップ性、制動性、及び操縦安定性などの走行性能が高いレベルで要求される。   High-performance tires used for high-speed driving are required to have high driving performance such as grip performance on dry and wet road surfaces, braking performance, and steering stability.

上記性能を満足させるには、カーボンブラックなどの補強性フィラーやオイルを増量する手法があるが、発熱性や耐摩耗性が低下する問題があり、またフィラーの増量はゴムの未加硫粘度の上昇により作業性が低下する欠点がある。   In order to satisfy the above performance, there is a method of increasing the amount of reinforcing filler such as carbon black and oil, but there is a problem that heat generation and wear resistance are reduced, and the increase of filler is the unvulcanized viscosity of rubber. There is a drawback that workability is lowered by the rise.

また、ウェット路面でのグリップ性を改良するためにシリカが用いられるが、作業性の低下を引き起こし、このため加工助剤を使用すると加工性は改善できるがトレッド剛性の低下を来たし操縦安定性を悪化させる。   Silica is used to improve the grip on wet roads, but it causes a decrease in workability.For this reason, the use of processing aids can improve the workability but reduce the tread rigidity and improve the handling stability. make worse.

また、特定のフェノール系樹脂を使用することで、グリップ性や操縦安定性を向上させることが提案されている(例えば、特許文献1、2)。   Further, it has been proposed to improve grip performance and steering stability by using a specific phenolic resin (for example, Patent Documents 1 and 2).

しかし、樹脂を高充填したゴム組成物をトレッドゴムに適用すると、樹脂の影響によって、タイヤの温度に対する性能変化が大きくなり、特に高速走行で使用されるタイヤでは、熱によるトレッドゴムの硬化現象、いわゆる熱ダレによってゴムが脆くなり、トレッド表面に粒子状のゴム粒が発生し、外観品質を低下させるという問題がある。
特開2006−249188号公報 特開2005−307166号公報
However, when a rubber composition highly filled with resin is applied to the tread rubber, the change in performance with respect to the temperature of the tire increases due to the influence of the resin, and particularly in a tire used at high speed running, the curing phenomenon of the tread rubber due to heat, There is a problem that the rubber becomes brittle due to so-called thermal sag, and particulate rubber particles are generated on the surface of the tread, which deteriorates the appearance quality.
JP 2006-249188 A JP 2005-307166 A

本発明は、タイヤのグリップ性、制動性、操縦安定性などの走行性能を損なうことなく走行後のトレッド表面のゴム粒の発生を抑えて外観性能を向上することができるタイヤ用ゴム組成物及びそのゴム組成物をトレッドゴムに用いた空気入りタイヤを提供することを目的とするものである。   The present invention relates to a rubber composition for a tire that can improve the appearance performance by suppressing the generation of rubber particles on the tread surface after running without impairing the running performance such as grip performance, braking performance, and steering stability of the tire, and An object of the present invention is to provide a pneumatic tire using the rubber composition as a tread rubber.

本発明者は、上記課題を解決するため鋭意検討したところ、特定のスチレンブタジエンゴムを含むシリカ配合系ゴム組成物に、従来はタイヤ用ゴム組成物に用いられることのなかったシリコーン変性フェノール樹脂を配合することで、グリップ性、操縦安定性などの走行性能を損なうことなく走行後のトレッド表面状態を改善できることを見出し本発明に至った。   The present inventor has intensively studied to solve the above-mentioned problems. As a result, a silicone-modified phenolic resin that has not been used in a tire rubber composition has been conventionally used as a silica-containing rubber composition containing a specific styrene-butadiene rubber. It has been found that, by blending, the tread surface condition after traveling can be improved without impairing traveling performance such as grip performance and steering stability.

すなわち、本発明は、ガラス転移温度が−40℃以上の溶液重合スチレンブタジエンゴムを50重量部以上含むジエン系ゴム成分100重量部に対して、シリカを20〜100重量部、カーボンブラックを0〜100重量部、シランカップリング剤、及びシリコーン変性フェノール樹脂1〜20重量部を配合してなることを特徴とするタイヤ用ゴム組成物である。   That is, in the present invention, silica is 20 to 100 parts by weight, carbon black is 0 to 100 parts by weight with respect to 100 parts by weight of a diene rubber component containing 50 parts by weight or more of solution-polymerized styrene butadiene rubber having a glass transition temperature of −40 ° C. or higher. A tire rubber composition comprising 100 parts by weight, a silane coupling agent, and 1 to 20 parts by weight of a silicone-modified phenol resin.

本発明のタイヤ用ゴム組成物においては、前記シリカとカーボンブラックの合計配合量が、前記ゴム成分100重量部に対して70〜150重量部であることが好ましい。   In the tire rubber composition of the present invention, the total amount of the silica and carbon black is preferably 70 to 150 parts by weight with respect to 100 parts by weight of the rubber component.

本発明によれば、タイヤのグリップ性、制動性、操縦安定性などの走行性能を損なうことなく走行後のトレッド表面のゴム粒の発生を抑え、タイヤの走行性能と外観性能を両立させる空気入りタイヤを提供することができる。   According to the present invention, the generation of rubber particles on the tread surface after running without impairing running performance such as grip performance, braking performance, and steering stability of the tire is suppressed, and the pneumatic performance that achieves both running performance and appearance performance of the tire is achieved. Tires can be provided.

本発明のタイヤ用ゴム組成物は、ゴム成分として、ガラス転移温度(Tg)が−40℃以上の溶液重合スチレンブタジエンゴム(S−SBR)をゴム成分100重量部中に50重量部以上含んで用いられる。   The rubber composition for tires of the present invention contains, as a rubber component, 50 parts by weight or more of 100 parts by weight of a solution-polymerized styrene butadiene rubber (S-SBR) having a glass transition temperature (Tg) of −40 ° C. or higher. Used.

本発明では、ゴム成分としては上記SBRを単独で用いても、他のジエン系ゴムの50重量部未満とブレンドし用いてもよい。他のジエン系ゴムとしては、上記以外のSBR(Tgが−40℃より低いS−SBR、乳化重合SBR)、天然ゴム、イソプレンゴム、ブタジエンゴムなどが挙げられ、これらの2種以上を用いてもよい。   In the present invention, as the rubber component, the above SBR may be used alone or blended with less than 50 parts by weight of another diene rubber. Examples of other diene rubbers include SBR other than the above (S-SBR having a Tg lower than −40 ° C., emulsion polymerization SBR), natural rubber, isoprene rubber, butadiene rubber, and the like. Also good.

上記S−SBRは、Tgが−40℃以上であれば、特にそのミクロ構造は限定されないが、結合スチレン量が30〜50%であるものが好ましい。   The S-SBR is not particularly limited in its microstructure as long as Tg is -40 ° C or higher, but preferably has a bound styrene content of 30 to 50%.

Tgが−40℃より低いと、常温以上の使用温度で、適度なゴム弾性率や剛性が得られずグリップ性が低下する。Tgの上限は特に制限されないが、−10℃程度であり、Tgが高くなると耐摩耗性が低下する。ここで、Tgは、JIS K7121に準拠して示差走査熱量測定(DSC)を用いて測定される値(昇温速度20℃/分)である。   When Tg is lower than −40 ° C., an appropriate rubber elastic modulus and rigidity cannot be obtained at a use temperature equal to or higher than normal temperature, and grip properties are deteriorated. The upper limit of Tg is not particularly limited, but is about −10 ° C., and wear resistance decreases as Tg increases. Here, Tg is a value (temperature increase rate 20 ° C./min) measured using differential scanning calorimetry (DSC) in accordance with JIS K7121.

また、結合スチレン量が30%未満では必要とするグリップ性能が得らず、50%を超えると転がり抵抗、耐摩耗性が悪化する傾向にある。   Further, if the amount of bound styrene is less than 30%, the required grip performance cannot be obtained, and if it exceeds 50%, rolling resistance and wear resistance tend to deteriorate.

本発明では、上記S−SBRの重量平均分子量(Mw)は90万以上が好ましく、100万以上がより好ましい。S−SBRのMwが90万未満では、高歪での弾性率が低下し、操縦安定性が損なわれる傾向がある。また、S−SBRのMwは220万以下が好ましく、200万以下がより好ましい。S−SBRのMwが220万をこえると、混合工程において、SBRの分散不良を引き起こし、期待されるゴム特性を発揮することができないことがある。   In the present invention, the weight average molecular weight (Mw) of the S-SBR is preferably 900,000 or more, more preferably 1,000,000 or more. If the Mw of S-SBR is less than 900,000, the elastic modulus at high strain tends to decrease, and the steering stability tends to be impaired. Further, the Mw of S-SBR is preferably 2.2 million or less, and more preferably 2 million or less. If the Mw of S-SBR exceeds 2.2 million, SBR may be poorly dispersed in the mixing step, and the expected rubber properties may not be exhibited.

このS−SBRにより、グリップ性、操縦安定性をゴム組成物に付与することができ、該SBRの含有率が50重量部未満では、充分なグリップ性能を発揮することができない。   With this S-SBR, grip properties and steering stability can be imparted to the rubber composition, and if the SBR content is less than 50 parts by weight, sufficient grip performance cannot be exhibited.

本発明においては、ゴム成分100重量部に対して、補強性フィラーとしてシリカを20〜100重量部、カーボンブラックを0〜100重量部配合される。好ましくは、その合計配合量が70〜150重量部である。   In the present invention, 20 to 100 parts by weight of silica and 0 to 100 parts by weight of carbon black are blended as reinforcing fillers with respect to 100 parts by weight of the rubber component. Preferably, the total compounding amount is 70 to 150 parts by weight.

シリカを配合することで、ウェット路面でのグリップ性を向上するとともに、発熱を抑えて転がり抵抗を低減することができる。シリカが20重量部未満では、その効果が得られず、100重量部を超えると未加硫粘度が上昇し加工性が悪化する。   By blending silica, it is possible to improve grip performance on wet road surfaces and to suppress heat generation to reduce rolling resistance. If the silica content is less than 20 parts by weight, the effect cannot be obtained. If the silica content exceeds 100 parts by weight, the unvulcanized viscosity increases and the processability deteriorates.

使用されるシリカとしては、例えば、BET比表面積(BET)が250m/g以下であり、かつCTAB表面積が200m/g以下のコロイダル特性を有するものが挙げられる。このようなシリカは加工性を維持することができるとともに、タイヤの発熱性を低減させ転がり抵抗を改善することができる。 Examples of the silica used include those having colloidal characteristics with a BET specific surface area (BET) of 250 m 2 / g or less and a CTAB surface area of 200 m 2 / g or less. Such silica can maintain workability, reduce the heat generation of the tire, and improve rolling resistance.

上記シリカは、例えば、湿式シリカ(含水ケイ酸),乾式シリカ(無水ケイ酸),ケイ酸カルシウム,ケイ酸アルミニウム等が挙げられるが、中でも破壊特性と低転がり抵抗の両立する湿式シリカが好ましく、また生産性に優れる点からも好ましい。市販品として、東ソー・シリカ(株)のニップシールAQ、トクヤマ(株)のトクシール、デグサ社のUlutrasilなどが使用できる。   Examples of the silica include wet silica (hydrous silicic acid), dry silica (anhydrous silicic acid), calcium silicate, aluminum silicate and the like. Among them, wet silica having both fracture characteristics and low rolling resistance is preferable. Moreover, it is preferable also from the point which is excellent in productivity. As commercial products, NIPSEAL AQ from Tosoh Silica Co., Ltd., Tokusil from Tokuyama Co., Ltd., Ultrasil from Degussa, etc. can be used.

さらに、シリカとしてはアミン類や有機高分子などで表面処理しポリマーとの親和性を改善した表面処理シリカなどを用いてもよい。   Furthermore, as the silica, surface-treated silica that has been surface-treated with amines or organic polymers to improve the affinity with the polymer may be used.

また、前記シリカ量に対して2〜25重量%のシランカップリング剤を使用する。より好ましくは5〜15重量%の範囲で使用される。   Further, 2 to 25% by weight of a silane coupling agent is used with respect to the amount of silica. More preferably, it is used in the range of 5 to 15% by weight.

シランカップリング剤としては、例えば、下記式(1)で表されるスルフィド結合を有するシランカップリング剤が挙げられる。
(C2a+1O)−Si−(CH−S−(CH−Si−(OC2a+1 ……(1)
式(1)中、aは1〜3の整数、bは1〜4の整数である。cはスルフィド部の硫黄数を表し、平均値は2〜4である。
Examples of the silane coupling agent include a silane coupling agent having a sulfide bond represented by the following formula (1).
(C a H 2a + 1 O) 3 —Si— (CH 2 ) b —S c — (CH 2 ) b —Si— (OC a H 2a + 1 ) 3 (1)
In formula (1), a is an integer of 1 to 3, and b is an integer of 1 to 4. c represents the number of sulfur in the sulfide part, and the average value is 2-4.

このような式(1)で表されるシランカップリング剤としては、例えば、ビス(3−トリエトキシシリルプロピル)ポリスルフィド、ビス(2−トリエトキシシリルエチル)ポリスルフィド、ビス(4−トリエトキシシリルブチル)ポリスルフィド、ビス(3−トリメトキシシリルプロピル)ポリスルフィド、ビス(2−トリメトキシシリルエチル)ポリスルフィドなどが挙げられる。中でも、ビス(3−トリエトキシシリルプロピル)テトラスルフィドやビス(3−トリエトキシシリルプロピル)ジスルフィドなどが好ましく、市販品としては、デグサ社の「Si−69」、「Si−75」などを使用することができる。   Examples of the silane coupling agent represented by the formula (1) include bis (3-triethoxysilylpropyl) polysulfide, bis (2-triethoxysilylethyl) polysulfide, and bis (4-triethoxysilylbutyl). ) Polysulfide, bis (3-trimethoxysilylpropyl) polysulfide, bis (2-trimethoxysilylethyl) polysulfide and the like. Among them, bis (3-triethoxysilylpropyl) tetrasulfide and bis (3-triethoxysilylpropyl) disulfide are preferable, and commercially available products such as “Si-69” and “Si-75” manufactured by Degussa are used. can do.

また、下記式(2)で表されるシランカップリング剤を使用することもできる。
(C2x+1O)Si−(CH−S−CO−C2z+1 ……(2)
式(2)中、xは1〜3の整数、yは1〜5の整数、zは5〜9の整数である。
Moreover, the silane coupling agent represented by following formula (2) can also be used.
(C x H 2x + 1 O ) 3 Si- (CH 2) y -S-CO-C z H 2z + 1 ...... (2)
In formula (2), x is an integer of 1 to 3, y is an integer of 1 to 5, and z is an integer of 5 to 9.

上記式(2)で表されるシランカップリング剤は保護化メルカプトシランであり、式(2)において、x=2、y=3、z=7である、GEシリコーンズ社の「NXT」が市販品として挙げられる。   The silane coupling agent represented by the above formula (2) is a protected mercaptosilane. In the formula (2), x = 2, y = 3, and z = 7, “NXT” of GE Silicones Co., Ltd. Listed as a commercial product.

本発明のゴム組成物は、シリカにカーボンブラックを併用することで、補強性を維持しつつ加工性を改善することができ、さらにグリップ性の改良効果を向上させることができる。   The rubber composition of the present invention can improve processability while maintaining reinforcement by using carbon black in combination with silica, and can further improve the effect of improving grip properties.

上記カーボンブラックとしては、特に制限はないが、ヨウ素吸着量(IA)が60mg/g以上、かつDBP吸油量が80ml/100g以上のカーボンブラックが好ましい。具体的には、SRF、GPF、FEF、HAF、ISAF、SAF等のグレードのものを用いることができる。   The carbon black is not particularly limited, but carbon black having an iodine adsorption amount (IA) of 60 mg / g or more and a DBP oil absorption of 80 ml / 100 g or more is preferable. Specifically, grades such as SRF, GPF, FEF, HAF, ISAF, and SAF can be used.

本発明のゴム組成物には、シリコーン変性フェノール樹脂がゴム成分100重量部に対して1〜20重量部配合し用いられる。   In the rubber composition of the present invention, a silicone-modified phenol resin is used in an amount of 1 to 20 parts by weight based on 100 parts by weight of the rubber component.

このシリコーン変性フェノール樹脂は、ノボラック型フェノール樹脂にポリシロキサン構造を有する化合物を導入した構造を有するものであり、例えば、特開2003−268062号公報に記載のシリコーン変性ノボラック型フェノール樹脂を使用することができる。市販品としては、住友ベークライト(株)製シリコーン変性フェノール樹脂「スミライトレジンPR−54529」が利用できる。   This silicone-modified phenolic resin has a structure in which a compound having a polysiloxane structure is introduced into a novolak-type phenolic resin. For example, a silicone-modified novolak-type phenolic resin described in JP-A-2003-268062 is used. Can do. As a commercial product, Sumitomo Bakelite Co., Ltd. silicone modified phenolic resin “Sumilite Resin PR-54529” can be used.

シリコーン変性フェノール樹脂がゴム成分100重量部に対して1重量部未満では、走行後トレッド表面に発生するゴム粒を抑える効果が発揮できず、20重量部を超えるとトレッドゴム硬度が上昇しグリップ性が低下し、走行後のトレッド表面状態も悪化するようになる。   If the silicone-modified phenolic resin is less than 1 part by weight with respect to 100 parts by weight of the rubber component, the effect of suppressing the rubber particles generated on the tread surface after running cannot be exerted, and if it exceeds 20 parts by weight, the tread rubber hardness increases and the grip properties Decreases and the tread surface condition after running also deteriorates.

このフェノール樹脂はシリカとの相溶性に優れるとともに、高速走行に伴う熱によるトレッドゴムの硬化現象を抑制し、従来のフェノール系樹脂配合の場合に生じるトレッド表面に粒子状のゴム粒が発生するのを防止し、外観品質を向上させることができる。   This phenolic resin has excellent compatibility with silica and suppresses the curing phenomenon of the tread rubber due to heat accompanying high-speed running, resulting in the generation of particulate rubber particles on the tread surface that occurs when a conventional phenolic resin is blended. Can be prevented and appearance quality can be improved.

本発明のタイヤ用ゴム組成物には、上記成分の他に、ゴム工業において通常に用いられる軟化剤、可塑剤、亜鉛華、ステアリン酸、老化防止剤、ワックス、加硫剤、加硫促進剤、加硫助剤、樹脂類などの各種配合剤を、本発明の効果を損なわない範囲で必要に応じ適宜配合し用いることができる。該ゴム組成物は、バンバリーミキサー、ニーダ等のゴム用混練機を用いて常法により調製される。   In addition to the above components, the rubber composition for tires of the present invention includes softeners, plasticizers, zinc white, stearic acid, anti-aging agents, waxes, vulcanizing agents, vulcanization accelerators commonly used in the rubber industry. Various compounding agents such as vulcanization aids and resins can be appropriately blended and used as necessary within the range not impairing the effects of the present invention. The rubber composition is prepared by a conventional method using a rubber kneader such as a Banbury mixer or a kneader.

本発明により得られるゴム組成物は、ドライ及びウェット路面でのグリップ性、制動性、操縦安定性など走行性能と走行後のトレッド表面状態を良好に両立させることができるので、トレッド用ゴム組成物として用いられる。特に、高速道路を多用する高性能乗用車、サーキットなどの競技用車両に装着される空気入りタイヤに好適に用いられる。   The rubber composition obtained by the present invention can satisfactorily achieve both the running performance such as grip performance on dry and wet road surfaces, braking performance, and handling stability and the tread surface state after running. Used as In particular, it is suitably used for high-performance passenger cars that frequently use highways and pneumatic tires that are mounted on competition vehicles such as circuits.

以下、本発明の実施例を示すが、本発明はこれらの実施例に限定されるものではない。   Examples of the present invention will be described below, but the present invention is not limited to these examples.

下記表1に示す配合処方に従い、容量20リットルの密閉式バンバリーミキサーを用いて混練することにより、各ゴム組成物を調製した。表1中の各成分は次の通りである。   Each rubber composition was prepared by kneading using a closed banbury mixer with a capacity of 20 liters according to the formulation shown in Table 1 below. Each component in Table 1 is as follows.

・SBR−1:バイエル社製、溶液重合SBR「VSL5025−OHM」(Tg=−15℃)
・SBR−2:JSR(株)製、乳化重合SBR「SBR1502」(Tg=−66℃)
・カーボンブラック(N234):三菱化学(株)製「ダイヤブラックN234」
・シリカ:デグサ社製「Ultrasil 7000GR」(BET比表面積=170m/g、CTAB表面積=160m/g)
・カップリング剤:上記式(1)で表されるシランカップリング剤、デグサ社製「Si75」
・オイル:ジャパンエナジー(株)製「JOMOプロセスNC−140」
・樹脂−1:住友ベークライト(株)製ストレート変性フェノール樹脂「スミライトレジンPR−50731」
・樹脂−2:住友ベークライト(株)製シリコーン変性フェノール樹脂「スミライトレジンPR−54529」
SBR-1: Bayer, solution polymerization SBR “VSL5025-OHM” (Tg = −15 ° C.)
-SBR-2: manufactured by JSR Corporation, emulsion polymerization SBR “SBR1502” (Tg = −66 ° C.)
Carbon black (N234): “Diamond Black N234” manufactured by Mitsubishi Chemical Corporation
Silica: “Ultrasil 7000GR” manufactured by Degussa (BET specific surface area = 170 m 2 / g, CTAB surface area = 160 m 2 / g)
Coupling agent: Silane coupling agent represented by the above formula (1), “Si75” manufactured by Degussa
・ Oil: Japan Energy Co., Ltd. “JOMO Process NC-140”
Resin-1: straight modified phenolic resin “Sumilite Resin PR-50731” manufactured by Sumitomo Bakelite Co., Ltd.
Resin-2: Silicone modified phenolic resin “Sumilite Resin PR-54529” manufactured by Sumitomo Bakelite Co., Ltd.

各ゴム組成物には、共通配合として、ゴム成分100重量部に対して、ステアリン酸(花王製「ルナックS−20」)2重量部、亜鉛華(三井金属鉱業製「亜鉛華1種」)3重量部、老化防止剤(フレキシス社製「サントフレックス6PPD」)2重量部、ワックス(日本精蝋(株)製「オゾエース0355」)2重量部、加硫促進剤(大内新興化学(株)製「ノクセラーCZ−G」)1.5重量部、硫黄(細井化学工業(株)製「粉末硫黄150メッシュ」)2.1重量部を配合した。   In each rubber composition, 2 parts by weight of stearic acid ("Lunac S-20" manufactured by Kao), zinc white ("Zinc Flower Type 1" manufactured by Mitsui Mining & Smelting Co., Ltd.) per 100 parts by weight of the rubber component is commonly used. 3 parts by weight, 2 parts by weight of anti-aging agent (“Santflex 6PPD” manufactured by Flexis), 2 parts by weight of wax (“Ozoace 0355” manufactured by Nippon Seiwa Co., Ltd.), vulcanization accelerator (Ouchi Shinsei Chemical Co., Ltd.) ) “Noxeller CZ-G”) 1.5 parts by weight and sulfur (“Powders 150 mesh” manufactured by Hosoi Chemical Co., Ltd.) 2.1 parts by weight were blended.

[評価]
得られた各ゴム配合組成物を用いてキャップ/ベース構造のトレッドを有するタイヤのキャップトレッドに適用し、225/45ZR17の空気入りラジアルタイヤを定法に従い製造した。そして、得られた各タイヤについて、ウェット性能、操縦安定性、走行後のトレッド表面状態を評価した。各評価方法は次の通りである。
[Evaluation]
Each rubber compound composition thus obtained was applied to a cap tread of a tire having a tread having a cap / base structure, and a 225 / 45ZR17 pneumatic radial tire was produced according to a conventional method. And about each obtained tire, wet performance, steering stability, and the tread surface state after driving | running | working were evaluated. Each evaluation method is as follows.

[ウェット性能]
各試験タイヤ4本を標準リムにて空気圧220kPaに調整し、BMW製「325i」に装着し、2〜3mmの水深で水をまいたアスファルト路面上を走行し、時速100kmにて摩擦係数を測定し、ウェットグリップ性能を評価した。比較例1の値を100とした指数で表示し、指数が大きいほどウェット性能に優れることを示す。
[Wet performance]
Four test tires were adjusted to a pressure of 220 kPa with a standard rim, mounted on BMW's “325i”, run on asphalt road surface watered at a depth of 2-3 mm, and the coefficient of friction was measured at 100 km / h The wet grip performance was evaluated. It displays with the index | exponent which set the value of the comparative example 1 to 100, and shows that it is excellent in wet performance, so that an index | exponent is large.

[操縦安定性]
各試験タイヤ4本を標準リムにて空気圧220kPaに調整し、BMW製「325i」に装着し、3名の官能テスト担当ドライバーが操舵安定性、走行安定性等に注意しながらテストコース(アスファルト舗装路)を高速走行し、操縦安定性を評価した。3名の平均をとり、比較例1を基準にし、優れているものを+2、やや優れているものを+1、同等のものを±0、やや劣っているものを−1、劣るものを−2として表に示した。
[Steering stability]
Four test tires were adjusted to a pressure of 220 kPa with a standard rim and mounted on BMW's “325i”, and the three test drivers in charge of the test course (asphalt pavement paying attention to steering stability, running stability, etc.) The road was run at high speed and the steering stability was evaluated. Average of 3 people, with Comparative Example 1 as a reference, +2 for excellent, +1 for slightly better, ± 0 for equivalent, -1 for slightly inferior, -2 for inferior As shown in the table.

[走行後のトレッド表面状態]
各試験タイヤ4本を標準リムにて空気圧220kPaに調整し、BMW製「325i」に装着し、テストコース(アスファルト舗装路)を2万km走行し、走行後のトレッド表面のゴム粒発生状態(ゴム粒の大きさ、発生量、分布状態など)を目視で評価した。比較例1を基準にし、優れているものを+2、やや優れているものを+1、同等のものを±0、やや劣っているものを−1、劣るものを−2として表に示した。
[Tread surface condition after running]
Four test tires were adjusted to a pressure of 220 kPa with a standard rim, mounted on a BMW “325i”, run on a test course (asphalt pavement) for 20,000 km, and rubber particles on the tread surface after running ( The size, generation amount, distribution state, etc. of the rubber particles were evaluated visually. Based on Comparative Example 1, the results are shown in the table as +2 for superior, +1 for slightly superior, ± 0 for equivalent, -1 for slightly inferior, and -2 for inferior.

Figure 2009102506
Figure 2009102506

表1から知られるように、本発明に係る実施例は、グリップ性、操縦安定性を維持しながら走行後のトレッド表面状態を改善することができ、タイヤの走行性能と外観性能を両立させることができる。   As can be seen from Table 1, the embodiment according to the present invention can improve the tread surface condition after running while maintaining the grip performance and the handling stability, and achieve both the running performance and the appearance performance of the tire. Can do.

本発明のタイヤ用ゴム組成物は、空気入りタイヤのトレッドゴムに用いることができ、特に高速道路を多用する高性能乗用車、サーキットなどの競技用車両に装着される空気入りタイヤに好適に用いることができる。   The tire rubber composition of the present invention can be used for a tread rubber of a pneumatic tire, and particularly preferably used for a pneumatic tire mounted on a racing vehicle such as a high-performance passenger car or circuit that frequently uses a highway. Can do.

Claims (3)

ガラス転移温度が−40℃以上の溶液重合スチレンブタジエンゴムを50重量部以上含むジエン系ゴム成分100重量部に対して、
シリカを20〜100重量部、カーボンブラックを0〜100重量部、シランカップリング剤、及びシリコーン変性フェノール樹脂1〜20重量部を配合してなる
ことを特徴とするタイヤ用ゴム組成物。
For 100 parts by weight of a diene rubber component containing 50 parts by weight or more of solution-polymerized styrene butadiene rubber having a glass transition temperature of −40 ° C. or higher,
A tire rubber composition comprising 20 to 100 parts by weight of silica, 0 to 100 parts by weight of carbon black, a silane coupling agent, and 1 to 20 parts by weight of a silicone-modified phenol resin.
前記シリカとカーボンブラックの合計配合量が、前記ゴム成分100重量部に対して70〜150重量部である
ことを特徴とする請求項1に記載のタイヤ用ゴム組成物。
2. The tire rubber composition according to claim 1, wherein the total amount of silica and carbon black is 70 to 150 parts by weight with respect to 100 parts by weight of the rubber component.
請求項1又は2に記載のタイヤ用ゴム組成物をトレッドゴムに用いた
ことを特徴とする空気入りタイヤ。
A pneumatic tire comprising the tire rubber composition according to claim 1 or 2 as a tread rubber.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011079880A (en) * 2009-10-02 2011-04-21 Toyo Tire & Rubber Co Ltd Rubber composition for tire tread and pneumatic tire
JP2015017241A (en) * 2013-06-10 2015-01-29 住友ベークライト株式会社 Phenol resin composition for rubber compounding, rubber composition, and tire
US10160847B2 (en) 2010-11-26 2018-12-25 Compagnie Generale Des Etablissments Michelin Tyre tread

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JP2000273245A (en) * 1999-03-08 2000-10-03 Goodyear Tire & Rubber Co:The Rubber composition containing liquid polymer having high tg and tire having tread comprising the same rubber composition
JP2002155165A (en) * 2000-11-20 2002-05-28 Bridgestone Corp Rubber composition and tire
JP2003268062A (en) * 2002-03-19 2003-09-25 Sumitomo Bakelite Co Ltd Silicone-modified novolak phenolic resin for being compounded into rubber
JP2004155959A (en) * 2002-11-07 2004-06-03 Yokohama Rubber Co Ltd:The Rubber composition
JP2006348149A (en) * 2005-06-15 2006-12-28 Yokohama Rubber Co Ltd:The Rubber composition for tire tread

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Publication number Priority date Publication date Assignee Title
JP2000273245A (en) * 1999-03-08 2000-10-03 Goodyear Tire & Rubber Co:The Rubber composition containing liquid polymer having high tg and tire having tread comprising the same rubber composition
JP2002155165A (en) * 2000-11-20 2002-05-28 Bridgestone Corp Rubber composition and tire
JP2003268062A (en) * 2002-03-19 2003-09-25 Sumitomo Bakelite Co Ltd Silicone-modified novolak phenolic resin for being compounded into rubber
JP2004155959A (en) * 2002-11-07 2004-06-03 Yokohama Rubber Co Ltd:The Rubber composition
JP2006348149A (en) * 2005-06-15 2006-12-28 Yokohama Rubber Co Ltd:The Rubber composition for tire tread

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011079880A (en) * 2009-10-02 2011-04-21 Toyo Tire & Rubber Co Ltd Rubber composition for tire tread and pneumatic tire
US10160847B2 (en) 2010-11-26 2018-12-25 Compagnie Generale Des Etablissments Michelin Tyre tread
JP2015017241A (en) * 2013-06-10 2015-01-29 住友ベークライト株式会社 Phenol resin composition for rubber compounding, rubber composition, and tire

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