JP2005154696A - Rubber composition for a tire tread - Google Patents

Rubber composition for a tire tread Download PDF

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Publication number
JP2005154696A
JP2005154696A JP2003399317A JP2003399317A JP2005154696A JP 2005154696 A JP2005154696 A JP 2005154696A JP 2003399317 A JP2003399317 A JP 2003399317A JP 2003399317 A JP2003399317 A JP 2003399317A JP 2005154696 A JP2005154696 A JP 2005154696A
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weight
styrene
rubber
parts
rubber composition
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Kazuyuki Nishioka
和幸 西岡
Takahiro Mabuchi
貴裕 馬渕
Katsumi Terakawa
克美 寺川
Kiyoshige Muraoka
清繁 村岡
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Priority to JP2003399317A priority Critical patent/JP2005154696A/en
Priority to EP10009146A priority patent/EP2261282A3/en
Priority to EP04023793A priority patent/EP1535959B1/en
Priority to EP10009147A priority patent/EP2261283A3/en
Priority to US10/960,273 priority patent/US7253235B2/en
Priority to CNA2008101094138A priority patent/CN101319062A/en
Priority to CNB2004100957423A priority patent/CN100406509C/en
Priority to CNA2008101094227A priority patent/CN101319063A/en
Publication of JP2005154696A publication Critical patent/JP2005154696A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber composition for a tire tread where gripping performance and abrasion resistance are highly balanced. <P>SOLUTION: The rubber composition for a tire tread comprises (a) a rubber component of 100 pts.wt. containing a styrene-butadiene copolymer rubber in which at least 60 wt% has styrene content of 20-60 wt%, (b) a low molecular weight styrene-butadiene copolymer of 5-200 pts.wt. whose styrene content is 10-70 wt% and weight average molecular weight is 2,000-50,000, (c) a resin of 2-50 pts.wt. whose softening point is 50-150°C, and (d) a softening agent and/or plasticizer of 1-10 pts.wt. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、タイヤトレッド用ゴム組成物に関し、詳細には耐摩耗性およびグリップ性能を高次に両立させたタイヤトレッド用ゴム組成物に関する。   The present invention relates to a rubber composition for tire treads, and more particularly to a rubber composition for tire treads that achieves both high wear resistance and grip performance.

レース用タイヤをはじめとした競技用タイヤのトレッドゴムには、一般に、耐摩耗性とグリップ性能との両立が要求される。従来、高いグリップ性能を得るために、たとえばガラス転移温度(Tg)の高いスチレン−ブタジエン共重合体ゴム(SBR)を使用する方法が知られているが、温度依存性が増大し、温度変化に対する性能変化が大きくなるという問題があった。   In general, tread rubber for racing tires and other racing tires is required to have both wear resistance and grip performance. Conventionally, in order to obtain a high grip performance, for example, a method using a styrene-butadiene copolymer rubber (SBR) having a high glass transition temperature (Tg) is known. There was a problem that the performance change became large.

また、軟化点の高い樹脂を、プロセスオイルと置換して配合する方法も知られているが、置換量が多量であると、該樹脂の影響により温度依存性が大きくなるという問題があった。   In addition, there is known a method of blending a resin having a high softening point by replacing it with process oil. However, if the amount of substitution is large, there is a problem that temperature dependency becomes large due to the influence of the resin.

さらに、軟化剤およびカーボンブラックを多量に配合する方法、または粒子径の小さいカーボンブラックを使用する方法も知られているが、カーボンブラックの分散性が悪く、耐摩耗性が低下してしまうという問題があった。   Furthermore, a method of blending a large amount of softener and carbon black, or a method of using carbon black having a small particle size is also known, but the problem is that the dispersibility of carbon black is poor and wear resistance decreases. was there.

特許文献1には液状ポリブタジエンを配合したタイヤトレッド用ゴム組成物が開示されているが、グリップ性能は向上するが、耐摩耗性が低下してしまうという問題があった。   Patent Document 1 discloses a rubber composition for tire treads containing liquid polybutadiene, but there is a problem that the grip performance is improved but the wear resistance is lowered.

特開2000−273245号公報JP 2000-273245 A

本発明は、耐摩耗性およびグリップ性能を高次に両立させたタイヤトレッド用ゴム組成物を提供することを目的とする。   An object of the present invention is to provide a rubber composition for a tire tread that has both high wear resistance and grip performance.

本発明は、(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に関する。
The present invention provides (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) 5 to 200 parts by weight of a low molecular weight styrene-butadiene copolymer having a styrene content of 10 to 70% by weight and a weight average molecular weight of 2000 to 50000,
(C) It relates to a rubber composition for a tire tread comprising 2 to 50 parts by weight of a resin having a softening point of 50 to 150 ° C., and (d) 1 to 10 parts by weight of a softener and / or a plasticizer.

本発明によれば、特定のミクロ構造を有するスチレン−ブタジエン共重合体ゴム成分に対して、特定の低分子量スチレン−ブタジエン共重合体、特定の樹脂、ならびに少量の軟化剤および/または可塑剤を配合することで、耐摩耗性およびグリップ性能を高次に両立させたタイヤトレッド用ゴム組成物を得ることができる。   According to the present invention, a specific low molecular weight styrene-butadiene copolymer, a specific resin, and a small amount of a softening agent and / or a plasticizer are added to a styrene-butadiene copolymer rubber component having a specific microstructure. By blending, a rubber composition for a tire tread having both higher wear resistance and grip performance can be obtained.

本発明のタイヤトレッド用ゴム組成物は(a)ゴム成分、(b)低分子量スチレン−ブタジエン共重合体、(c)樹脂、ならびに(d)軟化剤および/または可塑剤からなる。   The rubber composition for a tire tread of the present invention comprises (a) a rubber component, (b) a low molecular weight styrene-butadiene copolymer, (c) a resin, and (d) a softener and / or a plasticizer.

ゴム成分(a)は、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(SBR)からなる。該スチレン含有量の上限については、50重量%であることが好ましい。スチレン含有量が20重量%未満では、充分なグリップ性能が得られない。また、60重量%をこえると、耐摩耗性が低下するだけでなく、温度依存性が増大し、温度変化に対する性能変化が大きくなってしまう。   The rubber component (a) is made of styrene-butadiene copolymer rubber (SBR) having a styrene content of 20 to 60% by weight. The upper limit of the styrene content is preferably 50% by weight. If the styrene content is less than 20% by weight, sufficient grip performance cannot be obtained. On the other hand, when it exceeds 60% by weight, not only the wear resistance is lowered, but also the temperature dependency is increased, and the performance change with respect to the temperature change is increased.

前記SBRの含有量は、ゴム成分(a)中に60重量%以上である。該含有量の下限については、70重量%であることが好ましく、80重量%であることがより好ましい。また、上限については、100重量%であることが好ましく、90重量%であることがより好ましい。60重量%未満では、グリップ性能が低下してしまう。   The SBR content is 60% by weight or more in the rubber component (a). About the minimum of this content, it is preferable that it is 70 weight%, and it is more preferable that it is 80 weight%. Further, the upper limit is preferably 100% by weight, and more preferably 90% by weight. If it is less than 60% by weight, grip performance is lowered.

また、ゴム成分(a)は、前記SBR以外のゴム成分を含むことができる。他のゴムの成分としては、たとえばシス−1,4−ポリイソプレン、低シス−1,4−ポリブタジエン、高シス−1,4−ポリブタジエン、エチレン−プロピレン−ジエンゴム、クロロプレン、ハロゲン化ブチルゴム、アクリロニトリル−ブタジエンゴム、天然ゴムなどが挙げられるが、特にこれらに限定されるものではない。また、スチレン含有率が前記範囲外であるSBRを他のゴム成分として使用してもよい。これらの他のゴム成分は、本発明に使用されるゴム成分中に1種類または2種類以上含まれてもよい。   Further, the rubber component (a) can contain a rubber component other than the SBR. Examples of other rubber components include cis-1,4-polyisoprene, low cis-1,4-polybutadiene, high cis-1,4-polybutadiene, ethylene-propylene-diene rubber, chloroprene, halogenated butyl rubber, and acrylonitrile. Examples thereof include butadiene rubber and natural rubber, but are not particularly limited thereto. Moreover, you may use SBR whose styrene content rate is outside the said range as another rubber component. One or more of these other rubber components may be contained in the rubber component used in the present invention.

低分子量スチレン−ブタジエン共重合体(b)のスチレン含有量は、10〜70重量%である。該スチレン含有量の下限については、20重量%であることが好ましい。また、上限については、60重量%であることが好ましい。スチレン含有量が10重量%未満では、充分な耐摩耗性が得られない。また、70重量%をこえると、グリップ性能が低下するだけでなく、温度依存性が増大し、温度変化に対する性能変化が大きくなってしまう。   The styrene content of the low molecular weight styrene-butadiene copolymer (b) is 10 to 70% by weight. The lower limit of the styrene content is preferably 20% by weight. The upper limit is preferably 60% by weight. When the styrene content is less than 10% by weight, sufficient wear resistance cannot be obtained. On the other hand, if it exceeds 70% by weight, not only the grip performance is lowered, but also the temperature dependency is increased, and the performance change with respect to the temperature change is increased.

前記低分子量スチレン−ブタジエン共重合体(b)の重量平均分子量は、2000〜50000である。該重量平均分子量の下限については、2500であることが好ましく、3000であることがより好ましい。また、上限については、40000であることが好ましく、30000であることがより好ましい。重量平均分子量が2000未満では、耐摩耗性が低下する傾向がある。また、50000をこえると、特に低温時のグリップ性能が低下する傾向がある。   The low molecular weight styrene-butadiene copolymer (b) has a weight average molecular weight of 2000 to 50000. The lower limit of the weight average molecular weight is preferably 2500, and more preferably 3000. Moreover, about an upper limit, it is preferable that it is 40000, and it is more preferable that it is 30000. If the weight average molecular weight is less than 2,000, the wear resistance tends to decrease. Moreover, when it exceeds 50000, there exists a tendency for the grip performance at the time of low temperature to fall.

前記低分子量スチレン−ブタジエン共重合体(b)の配合量は、ゴム成分(a)100重量部に対して5〜200重量部である。該配合量の下限については、10重量部であることが好ましく、20重量部であることがより好ましい。また、上限については、180重量部であることが好ましく、150重量部であることがより好ましい。5重量部未満では、グリップ性能が低下し、200重量部をこえると、耐摩耗性が低下してしまう。   The amount of the low molecular weight styrene-butadiene copolymer (b) is 5 to 200 parts by weight with respect to 100 parts by weight of the rubber component (a). About the minimum of this compounding quantity, it is preferable that it is 10 weight part, and it is more preferable that it is 20 weight part. Further, the upper limit is preferably 180 parts by weight, and more preferably 150 parts by weight. If the amount is less than 5 parts by weight, the grip performance deteriorates. If the amount exceeds 200 parts by weight, the wear resistance decreases.

樹脂(c)とは、石油樹脂や結着剤である。   The resin (c) is a petroleum resin or a binder.

たとえばハイレッツ(商品名、三井石油化学工業(株)製)、エスコレッツ(エクソン化学(株)製)、タッキロール(住友化学工業(株)製)、アルコン(荒川化学工業(株)製)、ハリマック(播磨化成(株)製)、エステルガム(荒川化学工業(株)製)、ペンセル(荒川化学工業(株)製)、ライムレジン(荒川化学工業(株)製)、スーパーエステル(荒川化学工業(株)製)、ハイロジン(ヤスハラケミカル(株)製)、MRレジン(ヤスハラケミカル(株)製)、YSレジン(ヤスハラケミカル(株)製)、ネオポリマー(日本石油化学(株)製)、Wingtack(グッドイヤー化学社製)、クイントン(日本ゼオン(株)製)、リグノール(リグナイト社製)、ニカノール(三菱瓦斯化学(株)製)、YSポリスター(ヤスハラケミカル(株)製)、ヒタノール(日立化成工業(株))、スミライトレジン(住友デュレズ(株)製)、エスクロン(新日鉄化学(株)製)、タマノル(荒川化学工業(株)製)、プロセスレヂン(神戸油化学工業(株)製)などがあげられるが、特にこれらに限定されるものではない。これらは単独で用いてもよく、2種以上組み合わせて用いてもよい。   For example, Highlets (trade name, manufactured by Mitsui Petrochemical Co., Ltd.), Escorez (Exxon Chemical Co., Ltd.), Tacchirol (Sumitomo Chemical Co., Ltd.), Alcon (Arakawa Chemical Industries Co., Ltd.), Harimac ( Harima Kasei Co., Ltd.), Ester Gum (Arakawa Chemical Industries, Ltd.), Pencel (Arakawa Chemical Industries, Ltd.), Lime Resin (Arakawa Chemical Industries, Ltd.), Super Esters (Arakawa Chemical Industries, Ltd.) ), Hyrosin (Yasuhara Chemical Co., Ltd.), MR Resin (Yasuhara Chemical Co., Ltd.), YS Resin (Yasuhara Chemical Co., Ltd.), Neopolymer (Nippon Petrochemical Co., Ltd.), Wingtack (Goodyear Chemical) Co., Ltd., Quinton (manufactured by Nippon Zeon Co., Ltd.), Lignol (manufactured by Lignite Co., Ltd.), Nikanol (manufactured by Mitsubishi Gas Chemical Co., Ltd.), YS Polyster ( Suhara Chemical Co., Ltd.), Hitanol (Hitachi Chemical Industry Co., Ltd.), Sumilite Resin (Sumitomo Durez Co., Ltd.), Escron (Nippon Steel Chemical Co., Ltd.), Tamanoru (Arakawa Chemical Industries Co., Ltd.) , Process resin (manufactured by Kobe Oil Chemical Co., Ltd.) and the like, but are not particularly limited thereto. These may be used alone or in combination of two or more.

前記樹脂(c)の軟化点は、50〜150℃である。該軟化点の下限については、60℃であることが好ましく、70℃であることがより好ましい。また、上限については、140℃であることが好ましく、130℃であることがより好ましい。50℃未満では、耐摩耗性が低下してしまう。また、150℃をこえると、グリップ性能が低下してしまう。   The softening point of the resin (c) is 50 to 150 ° C. The lower limit of the softening point is preferably 60 ° C, more preferably 70 ° C. Moreover, about an upper limit, it is preferable that it is 140 degreeC, and it is more preferable that it is 130 degreeC. If it is less than 50 degreeC, abrasion resistance will fall. Moreover, when it exceeds 150 degreeC, grip performance will fall.

前記樹脂(c)の配合量は、ゴム成分(a)100重量部に対して2〜50重量部である。該配合量の下限については、5重量部であることが好ましく、10重量部であることがより好ましい。また、上限については、40重量部であることが好ましく、30重量部であることがより好ましい。2重量部未満では、グリップ性能向上の効果が小さく、50重量部をこえると、温度依存性が増大し、温度変化に対する性能変化が大きくなってしまう。   The compounding amount of the resin (c) is 2 to 50 parts by weight with respect to 100 parts by weight of the rubber component (a). About the minimum of this compounding quantity, it is preferable that it is 5 weight part, and it is more preferable that it is 10 weight part. Further, the upper limit is preferably 40 parts by weight, and more preferably 30 parts by weight. If the amount is less than 2 parts by weight, the effect of improving the grip performance is small.

軟化剤および/または可塑剤(d)は、ゴム工業で通常使用されているものを配合することができる。軟化剤としては、例えば、石油系軟化剤、コールタール系軟化剤、脂肪油系軟化剤などがあげられ、可塑剤としては、エステル系可塑剤などがあげられる。   As the softener and / or plasticizer (d), those usually used in the rubber industry can be blended. Examples of the softener include petroleum softeners, coal tar softeners, fatty oil softeners, and plasticizers include ester plasticizers.

前記軟化剤および/または可塑剤(d)の配合量は、ゴム成分(a)100重量部に対して1〜10重量部である。また、該配合量の上限については5重量部であることが好ましい。10重量部をこえると、耐摩耗性が低下してしまう。   The amount of the softener and / or plasticizer (d) is 1 to 10 parts by weight with respect to 100 parts by weight of the rubber component (a). Further, the upper limit of the amount is preferably 5 parts by weight. If it exceeds 10 parts by weight, the wear resistance will be reduced.

本発明のゴム組成物は、さらに補強用充填剤を含有することが好ましい。補強用充填剤としては、従来タイヤ用ゴム組成物において慣用されるもののなかから任意に選択して用いることができるが、主としてカーボンブラックが好ましい。補強用充填剤は単独で用いてもよく、2種以上組み合わせて用いてもよい。   The rubber composition of the present invention preferably further contains a reinforcing filler. The reinforcing filler can be arbitrarily selected from those conventionally used in rubber compositions for tires, but carbon black is mainly preferred. The reinforcing fillers may be used alone or in combination of two or more.

前記カーボンブラックの配合量は、ゴム成分(a)100重量部に対して10〜200重量部であることが好ましい。該配合量の下限については、20重量部であることがより好ましい。また、上限については、150重量部であることがより好ましい。カーボンブラックの配合量が10重量部未満では、耐摩耗性が低下し、200重量部をこえると、加工性が低下する。   The compounding amount of the carbon black is preferably 10 to 200 parts by weight with respect to 100 parts by weight of the rubber component (a). About the minimum of this compounding quantity, it is more preferable that it is 20 weight part. Further, the upper limit is more preferably 150 parts by weight. When the blending amount of carbon black is less than 10 parts by weight, the wear resistance is lowered, and when it exceeds 200 parts by weight, the workability is lowered.

前記カーボンブラックのチッ素吸着比表面積は、80〜280m2/gであることが好ましい。該チッ素吸着比表面積の下限については、100m2/gであることがより好ましい。また、上限については、200m2/gであることがより好ましい。チッ素吸着比表面積が80m2/g未満では、グリップ性能および耐摩耗性ともに低下し、280m2/gをこえると、良好な分散が得られにくく耐摩耗性が低下する。 The carbon black preferably has a nitrogen adsorption specific surface area of 80 to 280 m 2 / g. The lower limit of the nitrogen adsorption specific surface area is more preferably 100 m 2 / g. The upper limit is more preferably 200 m 2 / g. When the nitrogen adsorption specific surface area is less than 80 m 2 / g, both the grip performance and the wear resistance are lowered, and when it exceeds 280 m 2 / g, good dispersion is difficult to obtain and the wear resistance is lowered.

さらに、本発明のゴム組成物には、前記成分のほかにゴム工業で通常使用されている各種薬品、たとえば、硫黄などの加硫剤、各種加硫促進剤、各種軟化剤、各種老化防止剤、ステアリン酸、酸化防止剤、オゾン劣化防止剤などの添加剤を配合することができる。   Further, in addition to the above components, the rubber composition of the present invention includes various chemicals usually used in the rubber industry, such as vulcanizing agents such as sulfur, various vulcanization accelerators, various softening agents, and various anti-aging agents. Additives such as stearic acid, antioxidants, and ozone deterioration inhibitors can be blended.

本発明のゴム組成物は、空気入りタイヤのトレッド部に用いられる。該空気入りタイヤは、通常の空気入りタイヤの製造方法により製造できる。すなわち、前記ゴム組成物を未加硫の段階でタイヤのトレッド部の形状に押し出し加工し、タイヤ成型機上で通常の方法により貼り合わせて未加硫タイヤを成形する。この未加硫タイヤを加硫機中で加熱、加圧して空気入りタイヤを得る。   The rubber composition of the present invention is used for a tread portion of a pneumatic tire. The pneumatic tire can be manufactured by an ordinary pneumatic tire manufacturing method. That is, the rubber composition is extruded into the shape of a tread portion of a tire at an unvulcanized stage, and bonded together by a normal method on a tire molding machine to form an unvulcanized tire. This unvulcanized tire is heated and pressurized in a vulcanizer to obtain a pneumatic tire.

以下、実施例および比較例によって本発明をさらに詳しく説明するが、本発明の技術的範囲はこれらの実施例に限定されるものではない。   EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, the technical scope of this invention is not limited to these Examples.

製造例1〜4
以下に、低分子量スチレン−ブタジエン共重合体(b)の合成法について説明する。
Production Examples 1-4
The method for synthesizing the low molecular weight styrene-butadiene copolymer (b) will be described below.

製造例1(低分子量スチレン−ブタジエン共重合体1の合成)
窒素置換した2リットルオートクレーブに、シクロヘキサン1200g、テトラヒドロフラン(THF)5g、1,3−ブタジエン80gおよびスチレン25gを導入し、オートクレーブ内の温度を25℃に調製した。つぎに、n−ブチルリチウム0.05gを加えて昇温条件下で10分間重合し、その後、老化防止剤として2,6−ジ−t−ブチル−p−クレゾールを1.5g加えた。
Production Example 1 (Synthesis of low molecular weight styrene-butadiene copolymer 1)
Into a 2-liter autoclave purged with nitrogen, 1200 g of cyclohexane, 5 g of tetrahydrofuran (THF), 80 g of 1,3-butadiene and 25 g of styrene were introduced, and the temperature in the autoclave was adjusted to 25 ° C. Next, 0.05 g of n-butyllithium was added and polymerized for 10 minutes under elevated temperature conditions, and then 1.5 g of 2,6-di-t-butyl-p-cresol was added as an antioxidant.

製造例2〜4(低分子量スチレン−ブタジエン共重合体2〜4の合成)
前記処方においてモノマー量、触媒量などを変えた以外は同様の方法にて合成した。
Production Examples 2 to 4 (Synthesis of Low Molecular Weight Styrene-Butadiene Copolymers 2 to 4)
The compound was synthesized in the same manner except that the monomer amount and the catalyst amount were changed in the above formulation.

合成した前記共重合体(b)の重量平均分子量は、東ソー(株)製GPC−8000シリーズの装置、および検知器として示差屈折計を用いて測定し、分子量は標準ポリスチレンより校正した。また、該共重合体(b)のミクロ構造は、25℃にてJEOL JNM−A 400NMR装置を用いて1H NMRを測定し、そのスペクトルより求めた6.5〜7.2ppmのスチレン単位に基づくフェニルプロトンと、4.9〜5.4ppmのブタジエン単位に基づくビニルプロトンの比からその組成を決定した。それぞれの特性を表1に示す。 The weight average molecular weight of the synthesized copolymer (b) was measured using a differential refractometer as a GPC-8000 series apparatus manufactured by Tosoh Corporation and a detector, and the molecular weight was calibrated from standard polystyrene. Further, the microstructure of the copolymer (b) was measured by measuring 1 H NMR using a JEOL JNM-A 400 NMR apparatus at 25 ° C., and from 6.5 to 7.2 ppm of styrene units determined from the spectrum. Its composition was determined from the ratio of phenyl protons based on vinyl protons based on 4.9-5.4 ppm butadiene units. Each characteristic is shown in Table 1.

Figure 2005154696
Figure 2005154696

実施例1〜2および比較例1〜6
以下に、実施例および比較例で用いた各種薬品について説明する。
SBR1:旭化成工業(株)製のTUFDENE2100R(スチレン含有量:25重量%)
SBR2:旭化成工業(株)製のTUFDENE1000(スチレン含有量:18重量%)
低分子量スチレン−ブタジエン共重合体1〜4:前記製造例により合成した低分子量スチレン−ブタジエン共重合体
カーボンブラック:昭和キャボット(株)製のショウブラックN110(チッ素吸着比表面積:143m2/g)
樹脂1:エクソン化学(株)製のエスコレッツ1202(軟化点:100℃)
樹脂2:エスアンドエスジャパン(株)製のストラクトールTS30(軟化点:35℃)
樹脂3:日本石油化学(株)製のネオポリマー150(軟化点:155℃)
軟化剤:出光興産(株)製のダイアナプロセスオイルAH−16
ステアリン酸:日本油脂(株)製のステアリン酸
酸化亜鉛:三井金属鉱業(株)製の亜鉛華1号
硫黄:鶴見化学工業(株)製の粉末硫黄
加硫促進剤:大内新興化学工業(株)製のノクセラーCZ
Examples 1-2 and Comparative Examples 1-6
Below, various chemical | medical agents used by the Example and the comparative example are demonstrated.
SBR1: TUFDENE2100R manufactured by Asahi Kasei Corporation (styrene content: 25% by weight)
SBR2: TUFDENE1000 manufactured by Asahi Kasei Corporation (styrene content: 18% by weight)
Low molecular weight styrene-butadiene copolymer 1-4: Low molecular weight styrene-butadiene copolymer carbon black synthesized by the above production example: Show black N110 (nitrogen adsorption specific surface area: 143 m 2 / g, manufactured by Showa Cabot Corporation) )
Resin 1: Escollets 1202 manufactured by Exxon Chemical Co., Ltd. (softening point: 100 ° C.)
Resin 2: Sstructor TS30 (softening point: 35 ° C.) manufactured by S & S Japan Co., Ltd.
Resin 3: Nippon Petrochemical Co., Ltd. Neopolymer 150 (softening point: 155 ° C.)
Softener: Diana Process Oil AH-16 manufactured by Idemitsu Kosan Co., Ltd.
Stearic acid: Zinc stearate oxide manufactured by Nippon Oil & Fats Co., Ltd .: Zinc Hua No. 1 manufactured by Mitsui Metal Mining Co., Ltd. Sulfur: Powder sulfur vulcanization accelerator manufactured by Tsurumi Chemical Industry Co., Ltd. Noxeller CZ made by

表2に示す配合処方に従って、混練り配合し、各種供試ゴム組成物を得た。これらの配合物を170℃で20分間プレス加硫して加硫物を得、これらについて以下に示す各特性試験を行なった。   According to the blending formulation shown in Table 2, kneading and blending were performed to obtain various test rubber compositions. These blends were press vulcanized at 170 ° C. for 20 minutes to obtain vulcanizates, which were subjected to the following characteristic tests.

(グリップ性能)
グリップ評価は(株)上島製作所製フラットベルト式摩擦試験機(FR5010型)を用いて評価した。幅20mm、直径100mmの円筒形のゴム試験片を用い、速度20km/h、荷重4kgf、路面温度10℃および50℃で路面に対するサンプルのスリップ率を0〜70%まで変化させ、その際に検出される摩擦係数の中の最大値を読みとった。比較例1を100として指数表示した。数値が大きいほどグリップ性能が高いことを示している。
(Grip performance)
The grip evaluation was performed using a flat belt friction tester (FR5010 type) manufactured by Ueshima Seisakusho. Using a cylindrical rubber test piece with a width of 20 mm and a diameter of 100 mm, the slip ratio of the sample with respect to the road surface is changed from 0 to 70% at a speed of 20 km / h, a load of 4 kgf, a road surface temperature of 10 ° C. and 50 ° C., and detected at that time. The maximum value of the coefficient of friction to be taken was read. Comparative example 1 was taken as 100 and displayed as an index. The larger the value, the higher the grip performance.

(耐摩耗性)
ランボーン型摩耗試験機を用いて、室温、負荷荷重1.0kgf、スリップ率30%の条件で摩耗量を測定した。摩耗量の逆数をとり、比較例1を100として指数表示した。数値が大きいほど耐摩耗性が高いことを示している。
(Abrasion resistance)
The amount of wear was measured at room temperature, a load of 1.0 kgf, and a slip rate of 30% using a Lambone-type wear tester. The reciprocal of the amount of wear was taken and indexed with Comparative Example 1 as 100. It shows that abrasion resistance is so high that a numerical value is large.

各特性試験の評価結果を表2に示す。   The evaluation results of each characteristic test are shown in Table 2.

Figure 2005154696
Figure 2005154696

Claims (1)

(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。
(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) 5 to 200 parts by weight of a low molecular weight styrene-butadiene copolymer having a styrene content of 10 to 70% by weight and a weight average molecular weight of 2000 to 50000,
(C) A rubber composition for a tire tread comprising 2 to 50 parts by weight of a resin having a softening point of 50 to 150 ° C., and (d) 1 to 10 parts by weight of a softener and / or a plasticizer.
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JP2007137941A (en) * 2005-11-15 2007-06-07 Sumitomo Rubber Ind Ltd Rubber composition and high performance tire using the same
JP2007326942A (en) * 2006-06-07 2007-12-20 Bridgestone Corp Pneumatic tire
EP2014711A2 (en) 2007-06-22 2009-01-14 Sumitomo Rubber Industries, Ltd. Rubber composition for tire, and winter tire using the same
EP1770122A3 (en) * 2005-09-26 2009-02-18 Sumtiomo Rubber Industries Ltd Rubber composition for tire and tire using the same
JP2009235274A (en) * 2008-03-27 2009-10-15 Bridgestone Corp Rubber composition and tire using the same
JP2010260489A (en) * 2009-05-08 2010-11-18 Yokohama Rubber Co Ltd:The Pneumatic tire
US7956130B2 (en) 2006-08-01 2011-06-07 Sumitomo Rubber Industries, Ltd. Rubber composition for tire and tire using the same
JP2014159500A (en) * 2013-02-19 2014-09-04 Bridgestone Corp Rubber composition for tire
DE102015225333A1 (en) 2014-12-17 2016-06-23 Toyo Tire & Rubber Co., Ltd. Copolymer, rubber composition and pneumatic tire
JP2017101209A (en) * 2015-12-04 2017-06-08 住友ゴム工業株式会社 Rubber composition for tire and pneumatic tire

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JP2002155165A (en) * 2000-11-20 2002-05-28 Bridgestone Corp Rubber composition and tire
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JP2002155165A (en) * 2000-11-20 2002-05-28 Bridgestone Corp Rubber composition and tire
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EP1770122A3 (en) * 2005-09-26 2009-02-18 Sumtiomo Rubber Industries Ltd Rubber composition for tire and tire using the same
US7762295B2 (en) 2005-09-26 2010-07-27 Sumitomo Rubber Industries, Ltd. Rubber composition for tire and tire using the same
JP2007137941A (en) * 2005-11-15 2007-06-07 Sumitomo Rubber Ind Ltd Rubber composition and high performance tire using the same
JP2007326942A (en) * 2006-06-07 2007-12-20 Bridgestone Corp Pneumatic tire
US7956130B2 (en) 2006-08-01 2011-06-07 Sumitomo Rubber Industries, Ltd. Rubber composition for tire and tire using the same
EP2014711A2 (en) 2007-06-22 2009-01-14 Sumitomo Rubber Industries, Ltd. Rubber composition for tire, and winter tire using the same
JP2009235274A (en) * 2008-03-27 2009-10-15 Bridgestone Corp Rubber composition and tire using the same
JP2010260489A (en) * 2009-05-08 2010-11-18 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2014159500A (en) * 2013-02-19 2014-09-04 Bridgestone Corp Rubber composition for tire
DE102015225333A1 (en) 2014-12-17 2016-06-23 Toyo Tire & Rubber Co., Ltd. Copolymer, rubber composition and pneumatic tire
US9708477B2 (en) 2014-12-17 2017-07-18 Toyo Tire & Rubber Co., Ltd. Copolymer, rubber composition and pneumatic tire
JP2017101209A (en) * 2015-12-04 2017-06-08 住友ゴム工業株式会社 Rubber composition for tire and pneumatic tire

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