JP5617225B2 - Rubber composition for tire tread and pneumatic tire using the same - Google Patents

Rubber composition for tire tread and pneumatic tire using the same Download PDF

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JP5617225B2
JP5617225B2 JP2009267399A JP2009267399A JP5617225B2 JP 5617225 B2 JP5617225 B2 JP 5617225B2 JP 2009267399 A JP2009267399 A JP 2009267399A JP 2009267399 A JP2009267399 A JP 2009267399A JP 5617225 B2 JP5617225 B2 JP 5617225B2
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parts
mass
tire
tread
grip performance
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JP2011111489A (en
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陽一 瀧澤
陽一 瀧澤
秀一 中野
秀一 中野
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Yokohama Rubber Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/02Elements
    • C08K3/04Carbon
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L65/00Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain; Compositions of derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00Compositions of natural rubber
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06Copolymers with styrene

Description

本発明は、タイヤトレッド用ゴム組成物およびそれを用いた空気入りタイヤに関するものであり、詳しくは、高いグリップ性能および操縦安定性を有し、かつ耐摩耗性に優れるタイヤトレッド用ゴム組成物およびそれを用いた空気入りタイヤに関するものである。   The present invention relates to a rubber composition for a tire tread and a pneumatic tire using the same, and more specifically, a rubber composition for a tire tread having high grip performance and steering stability and excellent wear resistance, and The present invention relates to a pneumatic tire using the same.

従来、競技用タイヤでは、走行初期からグリップ性能が高く、さらにトレッドが発熱した後にも高いグリップ性能を維持することが求められている。また、耐摩耗性との両立も重要である。
グリップ性能を高めるために、高Tgのスチレン−ブタジエン共重合体ゴム(SBR)に高軟化点の粘着性付与樹脂を配合したり、低分子量のスチレン−ブタジエン共重合体を配合する技術が知られている。しかしながら、走行初期のグリップ性能は今だ不充分である。また、耐摩耗性も劣り、充分なグリップ性能および操縦安定性の持続性が得られないという問題点があった。
Conventionally, competition tires are required to have high grip performance from the beginning of running and to maintain high grip performance even after the tread has generated heat. It is also important to achieve both wear resistance.
In order to improve the grip performance, a technology of blending a high Tg styrene-butadiene copolymer rubber (SBR) with a high softening point tackifying resin or a low molecular weight styrene-butadiene copolymer is known. ing. However, the grip performance at the beginning of running is still insufficient. In addition, the wear resistance is inferior, and there is a problem that sufficient grip performance and sustainability of steering stability cannot be obtained.

下記特許文献1には、(a)スチレン含有量が20〜60重量%であるスチレン−ブタジエン共重合体ゴムを60重量%以上含有するゴム成分100重量部に対して、(b)スチレン含有量が10〜70重量%、および重量平均分子量が2000〜50000である低分子量スチレン−ブタジエン共重合体5〜200重量部、(c)軟化点が50〜150℃である樹脂2〜50重量部、ならびに(d)軟化剤および/または可塑剤1〜10重量部からなるタイヤトレッド用ゴム組成物が開示されている。しかしながら特許文献1に開示された技術では、上記の従来の問題点、すなわち走行初期を含めたグリップ性能、操縦安定性、耐摩耗性を高次元で維持することはできない。   In Patent Document 1 below, (a) 100 parts by weight of a rubber component containing 60% by weight or more of a styrene-butadiene copolymer rubber having a styrene content of 20 to 60% by weight, (b) the styrene content 5 to 200 parts by weight of a low molecular weight styrene-butadiene copolymer having a weight average molecular weight of 2000 to 50000, (c) 2 to 50 parts by weight of a resin having a softening point of 50 to 150 ° C, And (d) a rubber composition for a tire tread comprising 1 to 10 parts by weight of a softener and / or a plasticizer. However, the technique disclosed in Patent Document 1 cannot maintain the above-mentioned conventional problems, that is, grip performance including the initial stage of driving, steering stability, and wear resistance at a high level.

特開2005−154696号公報JP 2005-154696 A

したがって本発明の目的は、高いグリップ性能および操縦安定性を有し、かつ耐摩耗性に優れるタイヤトレッド用ゴム組成物およびそれを用いた空気入りタイヤを提供することにある。   Accordingly, an object of the present invention is to provide a rubber composition for a tire tread having high grip performance and steering stability and excellent in wear resistance, and a pneumatic tire using the same.

本発明者らは鋭意研究を重ねた結果、特定のジエン系ゴムの組み合わせに対し、低分子量スチレン−ブタジエン共重合体の特定量、特定軟化点を有するテルペンフェノール樹脂の特定量、カーボンブラックの特定量、および、軟化剤および/または可塑剤の特定量を配合することにより、上記課題を解決できることを見出し、本発明を完成することができた。
すなわち本発明は以下のとおりである。
1.ガラス転移点Tgが−35〜0℃のスチレン−ブタジエン共重合体ゴム60〜90質量部および天然ゴム10〜40質量部からなるジエン系ゴム100質量部に対し、
数平均分子量が2000〜10000である低分子量スチレン−ブタジエン共重合体を10〜80質量部、
軟化点が130〜165℃のテルペンフェノール樹脂を10〜50質量部、
カーボンブラックを70〜130質量部、および
軟化剤および/または可塑剤を15〜80質量部
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。
2.前記1に記載のタイヤトレッド用ゴム組成物をトレッドに使用した空気入りタイヤ。
As a result of intensive research, the present inventors have determined that a specific amount of low molecular weight styrene-butadiene copolymer, a specific amount of terpene phenol resin having a specific softening point, and a specific carbon black for a specific diene rubber combination. It was found that the above problems could be solved by blending the amount and a specific amount of the softener and / or plasticizer, and the present invention could be completed.
That is, the present invention is as follows.
1. For 100 parts by mass of diene rubber consisting of 60 to 90 parts by mass of styrene-butadiene copolymer rubber having a glass transition point Tg of −35 to 0 ° C. and 10 to 40 parts by mass of natural rubber,
10 to 80 parts by mass of a low molecular weight styrene-butadiene copolymer having a number average molecular weight of 2000 to 10000,
10 to 50 parts by mass of a terpene phenol resin having a softening point of 130 to 165 ° C,
A rubber composition for a tire tread comprising 70 to 130 parts by mass of carbon black and 15 to 80 parts by mass of a softener and / or a plasticizer.
2. A pneumatic tire using the rubber composition for a tire tread described in 1 above as a tread.

本発明によれば、特定のジエン系ゴムの組み合わせに対し、低分子量スチレン−ブタジエン共重合体の特定量、特定軟化点を有するテルペンフェノール樹脂の特定量、カーボンブラックの特定量、および、軟化剤および/または可塑剤の特定量を配合することにより、走行初期から高いグリップ性能および操縦安定性を有し、かつ耐摩耗性に優れるタイヤトレッド用ゴム組成物およびそれを用いた空気入りタイヤを提供することができる。   According to the present invention, for a specific diene rubber combination, a specific amount of a low molecular weight styrene-butadiene copolymer, a specific amount of a terpene phenol resin having a specific softening point, a specific amount of carbon black, and a softener A rubber composition for a tire tread having high grip performance and handling stability from the beginning of running and having excellent wear resistance by blending a specific amount of a plasticizer and / or a pneumatic tire using the same can do.

空気入りタイヤの一例の部分断面図である。It is a fragmentary sectional view of an example of a pneumatic tire.

以下、本発明をさらに詳細に説明する。   Hereinafter, the present invention will be described in more detail.

図1は、本発明における空気入りタイヤの一例の部分断面図である。
図1において、空気入りタイヤは左右一対のビード部1およびサイドウォール2と、両サイドウォール2に連なるトレッド3からなり、ビード部1、1間に繊維コードが埋設されたカーカス層4が装架され、カーカス層4の端部がビードコア5およびビードフィラー6の廻りにタイヤ内側から外側に折り返されて巻き上げられている。また、トレッド3においては、カーカス層4の外側に、ベルト層7がタイヤ1周に亘って配置されている。
以下に説明する本発明のタイヤトレッド用ゴム組成物は、とくにトレッド3に有用である。
FIG. 1 is a partial cross-sectional view of an example of a pneumatic tire according to the present invention.
In FIG. 1, the pneumatic tire is composed of a pair of left and right bead portions 1 and sidewalls 2, and a tread 3 connected to both sidewalls 2, and a carcass layer 4 in which fiber cords are embedded between the bead portions 1 and 1 is mounted. Then, the end portion of the carcass layer 4 is turned up around the bead core 5 and the bead filler 6 from the tire inner side to the outer side. Further, in the tread 3, a belt layer 7 is disposed over the circumference of the tire outside the carcass layer 4.
The rubber composition for a tire tread of the present invention described below is particularly useful for the tread 3.

(ジエン系ゴム)
本発明で使用されるジエン系ゴム成分は、ガラス転移温度Tgが−35〜0℃のスチレン−ブタジエン共重合体ゴム(SBR)60〜90質量部および天然ゴム(NR)10〜40質量部から構成される。
SBRのTgが−35℃未満であると、トレッドが発熱した後、充分なグリップ性能が得られない。逆に0℃を超えると、走行初期のグリップ性能が悪化し、好ましくない。
NRの配合量が10質量部未満であると、走行初期のグリップ性能および耐摩耗性が悪化する。逆にNRの配合量が40質量部を超えると、トレッドが発熱した後のグリップ性能が悪化する。
なお、SBRおよびNRのさらに好ましい配合量は、SBR65〜85質量部、NR15〜35質量部である。
(Diene rubber)
The diene rubber component used in the present invention is composed of 60 to 90 parts by mass of styrene-butadiene copolymer rubber (SBR) having a glass transition temperature Tg of −35 to 0 ° C. and 10 to 40 parts by mass of natural rubber (NR). Composed.
If the TBR of SBR is less than -35 ° C, sufficient grip performance cannot be obtained after the tread generates heat. On the other hand, if it exceeds 0 ° C., the grip performance at the beginning of running deteriorates, which is not preferable.
When the blending amount of NR is less than 10 parts by mass, grip performance and wear resistance at the initial stage of travel are deteriorated. On the other hand, when the blending amount of NR exceeds 40 parts by mass, grip performance after the tread generates heat is deteriorated.
In addition, the more preferable compounding quantities of SBR and NR are 65 to 85 parts by mass of SBR and 15 to 35 parts by mass of NR.

(低分子量スチレン−ブタジエン共重合体)
本発明で使用される低分子量スチレン−ブタジエン共重合体は、数平均分子量(Mn)が2000〜10000である。低分子量スチレン−ブタジエン共重合体のMnが2000未満であると、耐摩耗性が悪化する。逆に10000を超えると、グリップ性能が悪化する。さらに好ましいMnは、3000〜9000である。
なお本発明におけるMnは、GPC法により測定された値である。
また、低分子量スチレン−ブタジエン共重合体のスチレン含有量は、10〜50重量%が好ましい。
(Low molecular weight styrene-butadiene copolymer)
The low molecular weight styrene-butadiene copolymer used in the present invention has a number average molecular weight (Mn) of 2000 to 10,000. When the Mn of the low molecular weight styrene-butadiene copolymer is less than 2000, the wear resistance is deteriorated. Conversely, if it exceeds 10,000, grip performance will deteriorate. Further preferable Mn is 3000 to 9000.
In the present invention, Mn is a value measured by GPC method.
The styrene content of the low molecular weight styrene-butadiene copolymer is preferably 10 to 50% by weight.

(テルペンフェノール樹脂)
本発明で使用されるテルペンフェノール樹脂は、テルペン化合物とフェノール類とを反応させて得られるものであり、公知のものから適宜選択することができる。また本発明において、テルペンフェノール樹脂の軟化点は125〜170℃である必要がある。軟化点が125℃未満では走行初期、ならびに連続走行時において充分なグリップ性能が得られず、また耐摩耗性が悪化する。逆に170℃を超えると、走行初期のグリップ性能が悪化する。
さらに好ましい軟化点は、130〜165℃である。
(Terpene phenol resin)
The terpene phenol resin used in the present invention is obtained by reacting a terpene compound with phenols, and can be appropriately selected from known ones. Moreover, in this invention, the softening point of a terpene phenol resin needs to be 125-170 degreeC. If the softening point is less than 125 ° C., sufficient grip performance cannot be obtained at the beginning of running and during continuous running, and the wear resistance deteriorates. On the other hand, if it exceeds 170 ° C., the grip performance at the beginning of running deteriorates.
A more preferable softening point is 130 to 165 ° C.

(充填剤)
本発明のタイヤトレッド用ゴム組成物は、各種充填剤を配合することができる。充填剤としてはとくに制限されず、用途により適宜選択すればよいが、例えばカーボンブラック、無機充填剤等が挙げられる。無機充填剤としては、例えばシリカ、クレー、タルク、炭酸カルシウム等を挙げることができる。本発明では充填剤としてカーボンブラックを必須成分とする。なお、本発明の効果の点から、カーボンブラックの窒素吸着比表面積(NSA)(注:JIS K6217−2に準拠して測定)は、120〜400m2/gであるのが好ましい。
(filler)
The rubber composition for a tire tread of the present invention can contain various fillers. The filler is not particularly limited and may be appropriately selected depending on the application. Examples thereof include carbon black and inorganic filler. Examples of the inorganic filler include silica, clay, talc, calcium carbonate and the like. In the present invention, carbon black is an essential component as a filler. Incidentally, from the viewpoint of the effect of the present invention, the nitrogen adsorption specific surface area of the carbon black (N 2 SA) (Note: measured according to JIS K6217-2) is preferably a 120~400m 2 / g.

(軟化剤および/または可塑剤)
本発明で使用される軟化剤としては、タイヤ用ゴム組成物に一般的に使用されているものであればよい。例えば、石油系軟化剤、コールタール系軟化剤、脂肪油系軟化剤等が挙げられる。また、本発明で使用される可塑剤においても、タイヤ用ゴム組成物に一般的に使用されているものであればよく、例えばエステル系可塑剤等が挙げられる。なお、ジエン系ゴム成分が油展されている場合は、そこに含まれる伸展油は、本発明における軟化剤および/または可塑剤に含まれるものとする。
(Softener and / or plasticizer)
As the softening agent used in the present invention, any softening agent generally used in tire rubber compositions may be used. Examples thereof include petroleum softeners, coal tar softeners, fatty oil softeners, and the like. In addition, the plasticizer used in the present invention may be any plasticizer generally used in tire rubber compositions, and examples thereof include ester plasticizers. In addition, when the diene rubber component is oil-extended, the extending oil contained therein is assumed to be included in the softener and / or plasticizer in the present invention.

(タイヤトレッド用ゴム組成物の配合割合)
本発明のタイヤトレッド用ゴム組成物は、Tgが−35〜0℃のSBR60〜90質量部およびNR10〜40質量部からなるジエン系ゴム100質量部に対し、
数平均分子量が2000〜10000である低分子量スチレン−ブタジエン共重合体を10〜80質量部、
軟化点が125〜170℃のテルペンフェノール樹脂を10〜50質量部、
カーボンブラックを70〜130質量部、および
軟化剤および/または可塑剤を15〜80質量部
配合してなることを特徴とする。
(Mixing ratio of rubber composition for tire tread)
The rubber composition for a tire tread of the present invention is based on 100 parts by mass of a diene rubber composed of 60 to 90 parts by mass of SBR having a Tg of −35 to 0 ° C. and 10 to 40 parts by mass of NR.
10 to 80 parts by mass of a low molecular weight styrene-butadiene copolymer having a number average molecular weight of 2000 to 10000,
10 to 50 parts by mass of a terpene phenol resin having a softening point of 125 to 170 ° C,
It is characterized by blending 70 to 130 parts by mass of carbon black and 15 to 80 parts by mass of a softening agent and / or a plasticizer.

低分子量スチレン−ブタジエン共重合体の配合量が10質量部未満であると、グリップ性能の向上効果が得られない。逆に80質量部を超えると、混合機等への密着のため、混合加工性が悪化し、また走行初期のグリップ性能、耐摩耗性が悪化し好ましくない。
テルペンフェノール樹脂の配合量が10質量部未満であると、グリップ性能の向上効果が得られない。逆に50質量部を超えると、混合機等への密着のため、混合加工性が悪化し、また走行初期のグリップ性能が悪化するので好ましくない。
カーボンブラックの配合量が70質量部未満であると、発熱性が低下し、グリップ性能が悪化するので好ましくない。逆に130質量部を超えると、走行初期のグリップ性能および耐摩耗性が悪化する。
軟化剤および/または可塑剤が15質量部未満であると、走行初期およびトレッドが発熱した後のグリップ性能が悪化する。逆に80質量部を超えると、走行初期およびトレッドが発熱した後のグリップ性能と耐摩耗性がいずれも悪化する。
When the blending amount of the low molecular weight styrene-butadiene copolymer is less than 10 parts by mass, the effect of improving the grip performance cannot be obtained. On the other hand, if it exceeds 80 parts by mass, it is not preferable because of the close contact with the mixer and the like, which deteriorates the mixing workability, and deteriorates the grip performance and wear resistance in the initial stage of running.
The improvement effect of grip performance is not acquired as the compounding quantity of a terpene phenol resin is less than 10 mass parts. On the other hand, if it exceeds 50 parts by mass, it is not preferable because it is in close contact with the mixer and the like, so that the mixing processability is deteriorated and the grip performance at the initial stage of traveling is deteriorated.
When the blending amount of the carbon black is less than 70 parts by mass, the heat build-up decreases and the grip performance deteriorates, which is not preferable. On the other hand, if it exceeds 130 parts by mass, grip performance and wear resistance in the initial stage of travel deteriorate.
When the amount of the softening agent and / or plasticizer is less than 15 parts by mass, the grip performance at the beginning of running and after the tread generates heat deteriorates. On the other hand, if it exceeds 80 parts by mass, both the grip performance and the wear resistance after running and after the tread generates heat are deteriorated.

低分子量スチレン−ブタジエン共重合体のさらに好ましい上記配合量は、15〜75質量部である。
テルペンフェノール樹脂のさらに好ましい上記配合量は、15〜45質量部である。
カーボンブラックのさらに好ましい上記配合量は、80〜120質量部である。
軟化剤および/または可塑剤のさらに好ましい上記配合量は、20〜75質量部である。
The more preferable blending amount of the low molecular weight styrene-butadiene copolymer is 15 to 75 parts by mass.
The said more preferable compounding quantity of a terpene phenol resin is 15-45 mass parts.
The said more preferable said compounding quantity of carbon black is 80-120 mass parts.
The said more preferable compounding quantity of a softener and / or a plasticizer is 20-75 mass parts.

本発明のタイヤトレッド用ゴム組成物には、前記した成分に加えて、加硫又は架橋剤、加硫又は架橋促進剤、老化防止剤などのタイヤトレッド用ゴム組成物に一般的に配合されている各種添加剤を配合することができ、かかる添加剤は一般的な方法で混練して組成物とし、加硫又は架橋するのに使用することができる。これらの添加剤の配合量も、本発明の目的に反しない限り、従来の一般的な配合量とすることができる。   The rubber composition for a tire tread of the present invention is generally blended with a rubber composition for a tire tread such as a vulcanization or cross-linking agent, a vulcanization or cross-linking accelerator, and an anti-aging agent in addition to the above-described components. Various additives can be blended, and such additives can be kneaded by a general method to form a composition, which can be used for vulcanization or crosslinking. The blending amounts of these additives can be set to conventional general blending amounts as long as the object of the present invention is not violated.

また本発明のタイヤトレッド用ゴム組成物は従来の空気入りタイヤの製造方法に従って空気入りタイヤを製造するのに使用することができる。   The rubber composition for a tire tread of the present invention can be used for producing a pneumatic tire according to a conventional method for producing a pneumatic tire.

以下、本発明を実施例および比較例によりさらに説明するが、本発明は下記例に制限されるものではない。   EXAMPLES Hereinafter, although an Example and a comparative example further demonstrate this invention, this invention is not restrict | limited to the following example.

実施例1〜6および比較例1〜12
サンプルの調製
表1および2に示す配合(質量部)において、加硫促進剤および硫黄を除く成分を55リットルのニーダーで15分間混練した後、ミキサー外に放出させて室温冷却した。続いて、該組成物を同ニーダーに再度入れ、加硫促進剤および硫黄を加えて混練し、タイヤトレッド用ゴム組成物を得た。
Examples 1-6 and Comparative Examples 1-12
Sample Preparation In the formulations (parts by mass) shown in Tables 1 and 2, components other than the vulcanization accelerator and sulfur were kneaded with a 55 liter kneader for 15 minutes, then discharged outside the mixer and cooled to room temperature. Subsequently, the composition was put into the kneader again, and a vulcanization accelerator and sulfur were added and kneaded to obtain a rubber composition for a tire tread.

グリップ性能
上記のように調製された各種ゴム組成物をトレッドに用いた195/55R15サイズの試験タイヤを作製した。次に、試験タイヤを4輪車両の4輪に装着し、1周2.2kmのサーキットを可能限界スピードで10周連続走行した。
前半グリップ性:高速走行の際の走行初期のグリップ性能を評価するため、最初の1〜3周の周回タイムの平均値を求め、比較例1のゴム組成物をトレッドに使用したタイヤで得られた最初の1〜3周の周回タイムの平均値を対照基準とした場合に、以下のように5段階で評価した:
5:対照基準に対して0.5秒以上速い場合、
4:対照基準に対して0.2秒以上0.5秒未満速い場合、
3:対照基準に対して±0.2秒未満である場合、
2:対照基準に対して0.2秒以上0.5秒未満遅い場合、
1:対照基準に対して0.5秒以上遅い場合。
後半グリップ性:高速走行の際のグリップ性能の変化を評価するため、上記の10周の走行のうちの最後の8〜10周の周回タイムの平均値を求め、比較例1のゴム組成物をトレッドに使用したタイヤで得られた最後の8〜10周の周回タイムの平均値を対照基準とした場合に、以下のように5段階で評価した:
5:対照基準に対して0.5秒以上速い場合、
4:対照基準に対して0.2秒以上0.5秒未満速い場合、
3:対照基準に対して±0.2秒未満である場合、
2:対照基準に対して0.2秒以上0.5秒未満遅い場合、
1:対照基準に対して0.5秒以上遅い場合。
Grip performance A test tire of 195 / 55R15 size was produced using the various rubber compositions prepared as described above for the tread. Next, the test tire was mounted on four wheels of a four-wheel vehicle, and the circuit of one lap 2.2 km was continuously run for ten laps at a possible limit speed.
First half grip property: In order to evaluate the grip performance at the initial stage of traveling at high speed, the average value of the first 1-3 lap times was obtained, and obtained with a tire using the rubber composition of Comparative Example 1 as a tread. In addition, when the average value of the first 1 to 3 lap times was used as a reference standard, the evaluation was made in five stages as follows:
5: When 0.5 seconds or more faster than the reference standard,
4: When faster than the reference by 0.2 seconds or more and less than 0.5 seconds,
3: When it is less than ± 0.2 seconds with respect to the reference standard,
2: When it is 0.2 seconds or more and less than 0.5 seconds later than the reference standard,
1: When more than 0.5 seconds later than the reference standard.
Second half grip property: In order to evaluate the change in grip performance during high speed running, the average value of the lap times of the last 8 to 10 laps of the above 10 lap runs was determined, and the rubber composition of Comparative Example 1 was used. When the average value of the lap times of the last 8 to 10 laps obtained with the tire used for the tread was used as a reference standard, the evaluation was made in five stages as follows:
5: When 0.5 seconds or more faster than the reference standard,
4: When faster than the reference by 0.2 seconds or more and less than 0.5 seconds,
3: When it is less than ± 0.2 seconds with respect to the reference standard,
2: When it is 0.2 seconds or more and less than 0.5 seconds later than the reference standard,
1: When more than 0.5 seconds later than the reference standard.

耐摩耗性:上記のようにして得られたタイヤトレッド用ゴム組成物を所定の金型中で160℃で20分間プレス加硫して加硫ゴム試験片を調製した。得られた加硫ゴム試験片について、JIS K6264に準拠して、FERRY MACHINE CO.製ピコ摩耗試験機を用いて耐摩耗性を測定した。測定結果は、比較例1を100として指数表示した。この数値が大きいほど耐摩耗性に優れていることを示す。
結果を表1および2に併せて示す。
Abrasion resistance: The rubber composition for tire tread obtained as described above was press-vulcanized at 160 ° C. for 20 minutes in a predetermined mold to prepare a vulcanized rubber test piece. About the obtained vulcanized rubber test piece, according to JIS K6264, FERRY MACHINE CO. Wear resistance was measured using a Pico abrasion tester. The measurement results are indicated by an index with Comparative Example 1 being 100. It shows that it is excellent in abrasion resistance, so that this figure is large.
The results are shown in Tables 1 and 2 together.

Figure 0005617225
Figure 0005617225

Figure 0005617225
Figure 0005617225

*1:NR(RSS#3)
*2:SBR−1(旭化成ケミカルズ(株)製タフデン2330、Tg=−46℃、油展量=SBR100質量部に対し37.5質量部)
*3:SBR−2(旭化成ケミカルズ(株)製タフデン3335、Tg=−28℃、油展量=SBR100質量部に対し37.5質量部)
*4:SBR−3(日本ゼオン(株)製Nipol NS116、Tg=−22℃、非油展)
*5:カーボンブラック(三菱化学(株)製ダイヤブラックA、窒素吸着比表面積(NSA)=142m2/g)
*6:低分子量スチレン−ブタジエン共重合体(サートマー社製RICON100、Mn=4500、スチレン含有量25質量%)
*7:芳香族変性テルペン樹脂(ヤスハラケミカル(株)製YSレジンTO115、軟化点=115±5℃)
*8:テルペンフェノール樹脂−1(ヤスハラケミカル(株)製YSポリスターT115、軟化点=115±5℃)
*9:テルペンフェノール樹脂−2(ヤスハラケミカル(株)製YSポリスターT130、軟化点=130±5℃)
*10:テルペンフェノール樹脂−3(ヤスハラケミカル(株)製YSポリスターT160、軟化点=160±5℃)
*11:オイル(昭和シェル石油(株)製エキストラクト4号S)
*12:可塑剤(フェロ社製サンチサイザー261A、フタル酸アルキル(C7−9)ベンジル)
*13:老化防止剤(フレキシス製サントフレックス6PPD)
*14:酸化亜鉛(正同化学工業(株)製酸化亜鉛3種)
*15:ステアリン酸(日油(株)製ビーズステアリン酸)
*16:加硫促進剤(大内新興化学工業(株)製ノクセラーCZ−G)
*17:硫黄(鶴見化学工業(株)製金華印油入微粉硫黄)
* 1: NR (RSS # 3)
* 2: SBR-1 (Toughden 2330, manufactured by Asahi Kasei Chemicals Corporation, Tg = −46 ° C., oil extended amount = 37.5 parts by mass with respect to 100 parts by mass of SBR)
* 3: SBR-2 (Toughden 3335 manufactured by Asahi Kasei Chemicals Corporation, Tg = −28 ° C., oil extended amount = 37.5 parts by mass with respect to 100 parts by mass of SBR)
* 4: SBR-3 (Nipol NS116 manufactured by Nippon Zeon Co., Ltd., Tg = −22 ° C., non-oil exhibition)
* 5: Carbon black (Diamond Black A manufactured by Mitsubishi Chemical Corporation, Nitrogen adsorption specific surface area (N 2 SA) = 142 m 2 / g)
* 6: Low molecular weight styrene-butadiene copolymer (RICON100 manufactured by Sartomer, Mn = 4500, styrene content 25% by mass)
* 7: Aromatic modified terpene resin (YSHARA Chemical Co., Ltd. YS resin TO115, softening point = 115 ± 5 ° C)
* 8: Terpene phenol resin-1 (YShara Chemical Co., Ltd. YS Polystar T115, softening point = 115 ± 5 ° C.)
* 9: Terpene phenol resin-2 (YShara Chemical Co., Ltd. YS Polyster T130, softening point = 130 ± 5 ° C.)
* 10: Terpene phenol resin-3 (YShara Chemical Co., Ltd. YS Polyster T160, softening point = 160 ± 5 ° C.)
* 11: Oil (Extract No. 4 S manufactured by Showa Shell Sekiyu KK)
* 12: Plasticizer (Santisizer 261A manufactured by Ferro Corporation, alkyl phthalate (C 7-9 ) benzyl)
* 13: Anti-aging agent (Santoflex 6PPD made by Flexis)
* 14: Zinc oxide (3 types of zinc oxide manufactured by Shodo Chemical Industry Co., Ltd.)
* 15: Stearic acid (beef stearic acid manufactured by NOF Corporation)
* 16: Vulcanization accelerator (Ouchi Shinsei Chemical Co., Ltd. Noxeller CZ-G)
* 17: Sulfur (fine powdered sulfur with Jinhua seal oil manufactured by Tsurumi Chemical Co., Ltd.)

上記の表1および2から明らかなように、実施例1〜6で調製されたタイヤトレッド用ゴム組成物は、特定のジエン系ゴムの組み合わせに対し、低分子量スチレン−ブタジエン共重合体の特定量、特定軟化点を有するテルペンフェノール樹脂の特定量、カーボンブラックの特定量、および、軟化剤および/または可塑剤の特定量を配合しているので、従来の代表的な比較例1のゴム組成物に対し、走行初期を含めた高いグリップ性能および操縦安定性を有し、かつ耐摩耗性に優れる結果となった。
これに対し、比較例2は、NR、テルペンフェノール樹脂および低分子量スチレン−ブタジエン共重合体を配合せず、軟化剤および/または可塑剤の配合量も本発明で規定する上限を超えているので、走行初期のグリップ性能が悪化し、耐摩耗性も悪化する結果となった。
比較例3は、NRおよびテルペンフェノール樹脂を配合していないので、走行初期のグリップ性能が悪化し、耐摩耗性も悪化する結果となった。
比較例4は、NRを配合せず、テルペンフェノール樹脂の替わりに芳香族変性テルペン樹脂を配合しているので、走行初期のグリップ性能が悪化し、耐摩耗性も悪化する結果となった。
比較例5は、NRを配合せず、軟化点が115℃のテルペンフェノール樹脂を配合しているので、走行初期のグリップ性能が悪化し、耐摩耗性も悪化する結果となった。
比較例6は、NRを配合していないので、走行初期のグリップ性能が悪化し、耐摩耗性の改善も見られなかった。
比較例7は、低分子量スチレン−ブタジエン共重合体の配合量が本発明で規定する上限を超えているので、走行初期のグリップ性能および耐摩耗性が悪化した。
比較例8は、軟化剤および/または可塑剤の配合量が本発明で規定する下限未満であるので、走行初期およびトレッドが発熱した後のグリップ性能が悪化した。
比較例9は、カーボンブラックの配合量が本発明で規定する上限を超えているので、走行初期のグリップ性能が悪化し、耐摩耗性も悪化する結果となった。
比較例10は、軟化剤および/または可塑剤の配合量が本発明で規定する上限を超えているので、トレッドが発熱した後のグリップ性能が悪化し、耐摩耗性も悪化する結果となった。
比較例11は、NRの配合量が本発明の規定する上限を超えているので、トレッドが発熱した後のグリップ性能が悪化した。
比較例12は、低分子量スチレン−ブタジエン共重合体を配合していないので、走行初期のグリップ性能およびトレッドが発熱した後のグリップ性能が悪化した。
As is clear from Tables 1 and 2 above, the rubber compositions for tire treads prepared in Examples 1 to 6 are specific amounts of low molecular weight styrene-butadiene copolymers with respect to specific diene rubber combinations. Since a specific amount of a terpene phenol resin having a specific softening point, a specific amount of carbon black, and a specific amount of a softener and / or a plasticizer are blended, a conventional rubber composition of a representative comparative example 1 On the other hand, it had high grip performance and handling stability including the initial stage of running, and excellent wear resistance.
On the other hand, Comparative Example 2 does not contain NR, terpene phenol resin and low molecular weight styrene-butadiene copolymer, and the amount of softener and / or plasticizer exceeds the upper limit specified in the present invention. As a result, grip performance at the beginning of running deteriorated and wear resistance also deteriorated.
In Comparative Example 3, since NR and terpene phenol resin were not blended, the grip performance at the beginning of running deteriorated and the wear resistance also deteriorated.
In Comparative Example 4, since NR was not blended and an aromatic modified terpene resin was blended in place of the terpene phenol resin, the grip performance at the beginning of running deteriorated and the wear resistance also deteriorated.
In Comparative Example 5, since NR was not blended and a terpene phenol resin having a softening point of 115 ° C. was blended, the grip performance at the beginning of running deteriorated and the wear resistance also deteriorated.
Since Comparative Example 6 did not contain NR, the grip performance at the beginning of running deteriorated and no improvement in wear resistance was observed.
Since the compounding quantity of the low molecular weight styrene-butadiene copolymer exceeded the upper limit prescribed | regulated by this invention in the comparative example 7, the grip performance and abrasion resistance of the driving | running | working initial stage deteriorated.
In Comparative Example 8, since the blending amount of the softener and / or the plasticizer was less than the lower limit specified in the present invention, the grip performance at the initial stage of running and after the tread generated heat deteriorated.
In Comparative Example 9, since the blending amount of carbon black exceeded the upper limit defined in the present invention, the grip performance at the initial stage of running deteriorated and the wear resistance also deteriorated.
In Comparative Example 10, since the blending amount of the softener and / or plasticizer exceeds the upper limit defined in the present invention, the grip performance after heat generation of the tread deteriorated and the wear resistance also deteriorated. .
In Comparative Example 11, since the blending amount of NR exceeded the upper limit defined by the present invention, the grip performance after the tread generated heat deteriorated.
In Comparative Example 12, since the low molecular weight styrene-butadiene copolymer was not blended, the grip performance at the beginning of running and the grip performance after the tread generated heat were deteriorated.

1 ビード部
2 サイドウォール
3 トレッド
4 カーカス層
5 ビードコア
6 ビードフィラー
7 ベルト層
1 Bead part 2 Side wall 3 Tread 4 Carcass layer 5 Bead core 6 Bead filler 7 Belt layer

Claims (2)

ガラス転移点Tgが−35〜0℃のスチレン−ブタジエン共重合体ゴム60〜90質量部および天然ゴム10〜40質量部からなるジエン系ゴム100質量部に対し、
数平均分子量が2000〜10000である低分子量スチレン−ブタジエン共重合体を10〜80質量部、
軟化点が130〜165℃のテルペンフェノール樹脂を10〜50質量部、
カーボンブラックを70〜130質量部、および
軟化剤および/または可塑剤を15〜80質量部
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。
For 100 parts by mass of diene rubber consisting of 60 to 90 parts by mass of styrene-butadiene copolymer rubber having a glass transition point Tg of −35 to 0 ° C. and 10 to 40 parts by mass of natural rubber,
10 to 80 parts by mass of a low molecular weight styrene-butadiene copolymer having a number average molecular weight of 2000 to 10000,
10 to 50 parts by mass of a terpene phenol resin having a softening point of 130 to 165 ° C,
A rubber composition for a tire tread comprising 70 to 130 parts by mass of carbon black and 15 to 80 parts by mass of a softener and / or a plasticizer.
請求項1に記載のタイヤトレッド用ゴム組成物をトレッドに使用した空気入りタイヤ。   A pneumatic tire using the rubber composition for a tire tread according to claim 1 as a tread.
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