JP5829734B2 - Rubber composition for tire and tire using the same - Google Patents
Rubber composition for tire and tire using the same Download PDFInfo
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- JP5829734B2 JP5829734B2 JP2014165417A JP2014165417A JP5829734B2 JP 5829734 B2 JP5829734 B2 JP 5829734B2 JP 2014165417 A JP2014165417 A JP 2014165417A JP 2014165417 A JP2014165417 A JP 2014165417A JP 5829734 B2 JP5829734 B2 JP 5829734B2
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- 229920001971 elastomer Polymers 0.000 title claims description 97
- 239000005060 rubber Substances 0.000 title claims description 97
- 239000000203 mixture Substances 0.000 title claims description 49
- 229920005989 resin Polymers 0.000 claims description 82
- 239000011347 resin Substances 0.000 claims description 82
- 150000003505 terpenes Chemical class 0.000 claims description 46
- 235000007586 terpenes Nutrition 0.000 claims description 46
- 244000043261 Hevea brasiliensis Species 0.000 claims description 21
- 229920003052 natural elastomer Polymers 0.000 claims description 21
- 229920001194 natural rubber Polymers 0.000 claims description 21
- 229920002857 polybutadiene Polymers 0.000 claims description 15
- 229920001195 polyisoprene Polymers 0.000 claims description 14
- 125000003118 aryl group Chemical group 0.000 claims description 5
- 230000000052 comparative effect Effects 0.000 description 45
- 239000000126 substance Substances 0.000 description 19
- MSFGZHUJTJBYFA-UHFFFAOYSA-M sodium dichloroisocyanurate Chemical compound [Na+].ClN1C(=O)[N-]C(=O)N(Cl)C1=O MSFGZHUJTJBYFA-UHFFFAOYSA-M 0.000 description 16
- 238000005096 rolling process Methods 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 238000013329 compounding Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 229920003048 styrene butadiene rubber Polymers 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000002174 Styrene-butadiene Substances 0.000 description 6
- 230000002542 deteriorative effect Effects 0.000 description 6
- 229920006272 aromatic hydrocarbon resin Polymers 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000005062 Polybutadiene Substances 0.000 description 4
- 229920005549 butyl rubber Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000012763 reinforcing filler Substances 0.000 description 4
- 238000009472 formulation Methods 0.000 description 3
- GRWFGVWFFZKLTI-IUCAKERBSA-N (-)-α-pinene Chemical compound CC1=CC[C@@H]2C(C)(C)[C@H]1C2 GRWFGVWFFZKLTI-IUCAKERBSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- XMGQYMWWDOXHJM-UHFFFAOYSA-N limonene Chemical compound CC(=C)C1CCC(C)=CC1 XMGQYMWWDOXHJM-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- WTARULDDTDQWMU-RKDXNWHRSA-N (+)-β-pinene Chemical compound C1[C@H]2C(C)(C)[C@@H]1CCC2=C WTARULDDTDQWMU-RKDXNWHRSA-N 0.000 description 1
- WTARULDDTDQWMU-IUCAKERBSA-N (-)-Nopinene Natural products C1[C@@H]2C(C)(C)[C@H]1CCC2=C WTARULDDTDQWMU-IUCAKERBSA-N 0.000 description 1
- ZZMVLMVFYMGSMY-UHFFFAOYSA-N 4-n-(4-methylpentan-2-yl)-1-n-phenylbenzene-1,4-diamine Chemical compound C1=CC(NC(C)CC(C)C)=CC=C1NC1=CC=CC=C1 ZZMVLMVFYMGSMY-UHFFFAOYSA-N 0.000 description 1
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- WTARULDDTDQWMU-UHFFFAOYSA-N Pseudopinene Natural products C1C2C(C)(C)C1CCC2=C WTARULDDTDQWMU-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- XCPQUQHBVVXMRQ-UHFFFAOYSA-N alpha-Fenchene Natural products C1CC2C(=C)CC1C2(C)C XCPQUQHBVVXMRQ-UHFFFAOYSA-N 0.000 description 1
- MVNCAPSFBDBCGF-UHFFFAOYSA-N alpha-pinene Natural products CC1=CCC23C1CC2C3(C)C MVNCAPSFBDBCGF-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229930006722 beta-pinene Natural products 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 1
- LCWMKIHBLJLORW-UHFFFAOYSA-N gamma-carene Natural products C1CC(=C)CC2C(C)(C)C21 LCWMKIHBLJLORW-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229920005555 halobutyl Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- GRWFGVWFFZKLTI-UHFFFAOYSA-N rac-alpha-Pinene Natural products CC1=CCC2C(C)(C)C1C2 GRWFGVWFFZKLTI-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Description
本発明は、タイヤ用ゴム組成物及びそれを用いたタイヤに関し、特には、タイヤのトレッド部材に用いることで、転がり抵抗等の他の性能を悪化させること無く、ウェットグリップ性能を向上させることが可能なタイヤ用ゴム組成物に関するものである。 The present invention relates to a tire rubber composition and a tire using the same, and in particular, when used for a tread member of a tire, the wet grip performance can be improved without deteriorating other performance such as rolling resistance. The present invention relates to a possible tire rubber composition.
昨今、湿潤路面における車両の安全性を向上させるために、タイヤのウェットグリップ性能を向上させることが求められている。この要求に対して、これまで、（１）補強性充填剤として汎用されているカーボンブラックに代えてシリカを配合したゴム組成物や、（２）ゴム成分としてブチルゴムを含むゴム組成物をタイヤのトレッド部材に使用する方法が採られてきた。 Recently, in order to improve the safety of a vehicle on a wet road surface, it is required to improve the wet grip performance of a tire. In response to this demand, tires have so far been (1) a rubber composition containing silica instead of carbon black, which is widely used as a reinforcing filler, and (2) a rubber composition containing butyl rubber as a rubber component. The method used for a tread member has been taken.
しかしながら、（１）シリカを配合したゴム組成物を用いた場合、未加硫ゴムの収縮の問題があるため、加工性が悪く、また、シリカは、カーボンブラックに比べて分散性が悪いため、トレッド部材使用すると、トレッドの耐摩耗性が低下する問題もある。 However, (1) when using a rubber composition containing silica, there is a problem of shrinkage of unvulcanized rubber, so the processability is poor, and silica is poor in dispersibility compared to carbon black, When the tread member is used, there is a problem that the wear resistance of the tread is lowered.
また、（２）ブチルゴムを含むゴム組成物を用いた場合、相溶性が悪化して、ブリードが発生するため、トレッドの機能が低下してしまう。 Moreover, when the rubber composition containing (2) butyl rubber is used, the compatibility is deteriorated and bleed is generated, so that the function of the tread is lowered.
一方、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴムは、優れた物理特性を有し、タイヤ部材のゴム成分として汎用されているが、一般にガラス転移温度が低いため、これらをゴム成分の主成分とするゴム組成物は０℃におけるｔａｎδが低く、タイヤのトレッド部材に使用すると、タイヤのウェットグリップ性能が低下してしまうことが知られている。 On the other hand, natural rubber, polyisoprene rubber and polybutadiene rubber have excellent physical properties and are widely used as rubber components for tire members, but generally have a low glass transition temperature, so these are the main components of the rubber component. It is known that the rubber composition has a low tan δ at 0 ° C., and when used for a tread member of a tire, the wet grip performance of the tire is lowered.
このような状況下、本発明の目的は、上記従来技術の問題を解決し、他の性能を悪化させること無く、ウェットグリップ性能を向上させることが可能なタイヤ用ゴム組成物、並びに該ゴム組成物をトレッド部材に用いたタイヤを提供することにある。 Under such circumstances, an object of the present invention is to solve the problems of the prior art and to improve the wet grip performance without deteriorating other performances, and the rubber composition It is providing the tire which used the thing for the tread member.
本発明者は、上記目的を達成するために鋭意検討した結果、特定のゴム成分に対して水素添加樹脂を特定量配合してなるゴム組成物をトレッド部材に用いることで、転がり抵抗等の他の性能を悪化させること無く、ウェットグリップ性能が向上することを見出し、本発明を完成させるに至った。 As a result of intensive investigations to achieve the above object, the present inventor has used a rubber composition in which a specific amount of a hydrogenated resin is blended with a specific rubber component for a tread member, so that other rolling resistance and the like can be obtained. The present inventors have found that the wet grip performance is improved without deteriorating the performance of the present invention, and have completed the present invention.
即ち、本発明のタイヤ用ゴム組成物は、
天然ゴム、ポリイソプレンゴム及びポリブタジエンゴムからなる群から選択される少なくとも一種を含むゴム成分１００質量部に対して、
水素添加樹脂を０．５質量部以上５０質量部以下配合してなり、
前記水素添加樹脂が、テルペン樹脂を水添してなる水添テルペン樹脂、又は、芳香族変性テルペン樹脂を水添してなる芳香族変性水添テルペン樹脂であり、
前記水添テルペン樹脂又は前記芳香族変性水添テルペン樹脂の軟化点が８０〜１８０℃であり、
前記ゴム成分中における、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴムの総含有率が５０質量％以上であることを特徴とする。
That is, the rubber composition for tires of the present invention is
For 100 parts by mass of a rubber component containing at least one selected from the group consisting of natural rubber, polyisoprene rubber and polybutadiene rubber,
0.5 parts by weight or more and 50 parts by weight or less of hydrogenated resin,
The hydrogenated resin is a hydrogenated terpene resin obtained by hydrogenating a terpene resin , or an aromatic modified hydrogenated terpene resin obtained by hydrogenating an aromatic modified terpene resin ,
The softening point of the hydrogenated terpene resin or the aromatic-modified hydrogenated terpene resin is 80 to 180 ° C.,
The total content of natural rubber, polyisoprene rubber and polybutadiene rubber in the rubber component is 50% by mass or more.
本発明のタイヤ用ゴム組成物の好適例においては、前記ゴム成分と前記水素添加樹脂のＳＰ値の差が１．５以下である。ここで、ゴム成分及び（水素添加）樹脂のＳＰ値は、Ｆｅｄｏｒｓ法に従って、計算することができる。 In a preferred example of the tire rubber composition of the present invention, the difference in SP value between the rubber component and the hydrogenated resin is 1.5 or less. Here, the SP value of the rubber component and the (hydrogenated) resin can be calculated according to the Fedors method.
また、本発明のタイヤは、上記のタイヤ用ゴム組成物をトレッド部材に用いたことを特徴とする。 The tire of the present invention is characterized by using the tire rubber composition described above for a tread member.
本発明によれば、特定のゴム成分に対して水素添加樹脂を特定量配合してなり、タイヤのトレッド部材に用いることで、転がり抵抗等の他の性能を悪化させること無く、ウェットグリップ性能を向上させることが可能なタイヤ用ゴム組成物、並びに該ゴム組成物をトレッド部材に用いたタイヤを提供することができる。 According to the present invention, a specific amount of hydrogenated resin is blended with a specific rubber component, and the wet grip performance can be obtained without deteriorating other performance such as rolling resistance by using it for a tread member of a tire. A rubber composition for a tire that can be improved and a tire using the rubber composition for a tread member can be provided.
以下に、本発明を詳細に説明する。本発明のタイヤ用ゴム組成物は、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴムからなる群から選択される少なくとも一種を含むゴム成分１００質量部に対して、水素添加樹脂を０．５質量部以上５０質量部以下配合してなり、前記水素添加樹脂が、テルペン樹脂を水添してなる水添テルペン樹脂であり、前記水添テルペン樹脂の軟化点が８０〜１８０℃であり、前記ゴム成分中における、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴムの総含有率が５０質量％以上であることを特徴とし、必要に応じて、その他の配合剤を含有することができる。 The present invention is described in detail below. The rubber composition for a tire according to the present invention includes 0.5 parts by mass or more of hydrogenated resin to 100 parts by mass of a rubber component containing at least one selected from the group consisting of natural rubber, polyisoprene rubber and polybutadiene rubber. The hydrogenated resin is a hydrogenated terpene resin obtained by hydrogenating a terpene resin, the softening point of the hydrogenated terpene resin is 80 to 180 ° C., and is contained in the rubber component. The total content of natural rubber, polyisoprene rubber and polybutadiene rubber is 50% by mass or more, and may contain other compounding agents as necessary.
一般に、樹脂を配合することで、０℃付近のｔａｎδ（損失正接）が向上して、ウェットグリップ性能を向上させることができるが、０℃付近以外のｔａｎδも同時に上昇してしまい、例えば、５０℃付近のｔａｎδも上昇してしまう。ここで、５０℃付近のｔａｎδは、タイヤの転がり抵抗の指標の一つとされており、一般に、５０℃付近のｔａｎδが高いゴム組成物をトレッド部材に用いることで、タイヤの転がり抵抗が上昇してしまう。 In general, by blending a resin, tan δ (loss tangent) near 0 ° C. can be improved and wet grip performance can be improved. However, tan δ other than near 0 ° C. also increases at the same time, for example, 50 Tan δ around 0 ° C. also increases. Here, tan δ around 50 ° C. is considered as one index of tire rolling resistance. Generally, by using a rubber composition having a high tan δ around 50 ° C. as a tread member, the tire rolling resistance increases. End up.
これに対して、樹脂を水添するとＳＰ値が下がるため、水素添加樹脂は、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴム等のゴム成分とのＳＰ値の差が、水添していない樹脂に比べて小さい。そのため、水素添加樹脂は、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴム等との相溶性が高い。その結果、水素添加樹脂を配合すると、ｔａｎδのピークがシャープとなり、０℃付近のｔａｎδが特異的に上昇し、０℃付近以外のｔａｎδはあまり上昇しないため、水素添加樹脂を配合したゴム組成物をタイヤのトレッド部材に用いることで、転がり抵抗等の他の性能を悪化させること無く、ウェットグリップ性能を向上させることが可能となる。 On the other hand, since the SP value decreases when the resin is hydrogenated, the difference in SP value between the hydrogenated resin and rubber components such as natural rubber, polyisoprene rubber and polybutadiene rubber is higher than that of the resin not hydrogenated. Small. Therefore, the hydrogenated resin is highly compatible with natural rubber, polyisoprene rubber, polybutadiene rubber, and the like. As a result, when a hydrogenated resin is blended, the peak of tan δ becomes sharp, tan δ near 0 ° C. rises specifically, and tan δ other than near 0 ° C. does not rise so much, so a rubber composition blended with a hydrogenated resin By using for the tread member of a tire, it becomes possible to improve wet grip performance, without deteriorating other performances, such as rolling resistance.
なお、水素添加樹脂の配合量が、上記ゴム成分１００質量部に対して０．５質量部未満では、０℃でのｔａｎδを向上させる効果が小さいため、タイヤのウェットグリップ性能を十分に向上させることできず、一方、１００質量部以上では、水素添加樹脂のゴム成分に対する溶解度を超えてしまうために、０℃でのｔａｎδの向上が小さくなり、５０℃でのｔａｎδが高くなってしまうためである。また、これらの観点から、水素添加樹脂の配合量は、上記ゴム成分１００質量部に対して、１〜５０質量部範囲である。 If the amount of the hydrogenated resin is less than 0.5 parts by mass with respect to 100 parts by mass of the rubber component, the effect of improving tan δ at 0 ° C. is small, so that the wet grip performance of the tire is sufficiently improved. On the other hand, at 100 parts by mass or more, the solubility of the hydrogenated resin with respect to the rubber component is exceeded, so the improvement in tan δ at 0 ° C. is small, and the tan δ at 50 ° C. is high. is there. Moreover, from these viewpoints, the compounding amount of the hydrogenated resin is in the range of 1 to 50 parts by mass with respect to 100 parts by mass of the rubber component.
本発明のタイヤ用ゴム組成物のゴム成分は、天然ゴム（ＮＲ）、ポリイソプレンゴム（ＩＲ）及びポリブタジエンゴム（ＢＲ）からなる群から選択される少なくとも一種を含み、必要に応じて、その他の合成ゴムを含んでもよく、その他の合成ゴムとしては、スチレン−ブタジエン共重合体ゴム（ＳＢＲ）、エチレン−プロピレン−ジエンゴム（ＥＰＤＭ）、クロロプレンゴム（ＣＲ）、ブチルゴム（ＩＩＲ）、ハロゲン化ブチルゴム、アクリロニリトル−ブタジエンゴム（ＮＢＲ）等が挙げられる。これらゴム成分は、一種単独で用いてもよいし、二種以上をブレンドして用いてもよい。 The rubber component of the rubber composition for tires of the present invention includes at least one selected from the group consisting of natural rubber (NR), polyisoprene rubber (IR) and polybutadiene rubber (BR). Synthetic rubbers may be included, and other synthetic rubbers include styrene-butadiene copolymer rubber (SBR), ethylene-propylene-diene rubber (EPDM), chloroprene rubber (CR), butyl rubber (IIR), halogenated butyl rubber, acrylic Examples include Roni Little-butadiene rubber (NBR). These rubber components may be used alone or in a blend of two or more.
なお、トレッド用のゴム組成物によく用いられるスチレン−ブタジエン共重合体ゴム（ＳＢＲ）は、水素添加樹脂とのＳＰ値の差が、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴム程小さくないため、ゴム成分がＳＢＲを主成分とするゴム組成物においては、水素添加樹脂の配合効果が小さい。そのため、本発明のタイヤ用ゴム組成物は、前記ゴム成分中における、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴムの総含有率が５０質量％以上である。 Note that styrene-butadiene copolymer rubber (SBR) often used in rubber compositions for treads is not as small as natural rubber, polyisoprene rubber and polybutadiene rubber because the difference in SP value from hydrogenated resin is not as small. In the rubber composition whose component is SBR as a main component, the blending effect of the hydrogenated resin is small. Therefore, the tire rubber composition of the present invention has a total content of 50% by mass or more of natural rubber, polyisoprene rubber and polybutadiene rubber in the rubber component.
本発明のタイヤ用ゴム組成物に用いる水素添加樹脂は、テルペン樹脂を水添してなる水添テルペン樹脂である。ここで、テルペン樹脂の水添は、公知の方法で行うことができ、また、本発明においては、市販の水添テルペン樹脂を使用することもできる。 The hydrogenated resin used in the rubber composition for tires of the present invention is a hydrogenated terpene resin obtained by hydrogenating a terpene resin. Here, hydrogenation of the terpene resin can be carried out by a known method, and in the present invention, a commercially available hydrogenated terpene resin can also be used.
また、上記水素添加樹脂の原料となる天然樹脂としては、α−ピネン系、β−ピネン系、ジペンテン系等のテルペン樹脂、芳香族変性テルペン樹脂、テルペンフェノール樹脂等のテルペン系樹脂が挙げられる。 Examples of the natural resin that is a raw material for the hydrogenated resin include terpene resins such as α-pinene-based, β-pinene-based, and dipentene-based resins, aromatic modified terpene resins, and terpene phenol resins.
上記水素添加樹脂として、具体的には、ヤスハラケミカル製クリアロンＰ１０５（商品名、軟化点１０５℃）、ヤスハラケミカル製クリアロンＰ１１５（商品名、軟化点１１５℃）、ヤスハラケミカル製クリアロンＰ１２５（商品名、軟化点１２５℃）、ヤスハラケミカル製クリアロンＰ１３５（商品名、軟化点１３５℃）、ヤスハラケミカル製クリアロンＰ１５０（商品名、軟化点１５２℃）、ヤスハラケミカル製クリアロンＭ１０５（商品名、軟化点１０５℃）、ヤスハラケミカル製クリアロンＭ１１５（商品名、軟化点１１５℃）、ヤスハラケミカル製クリアロンＫ１００（商品名、軟化点１００℃）、ヤスハラケミカル製クリアロンＫ１１０（商品名、軟化点１１０℃）、ヤスハラケミカル製クリアロンＫ４１００（商品名、軟化点１００℃）、ヤスハラケミカル製クリアロンＫ４０９０（商品名、軟化点９０℃）等が挙げられる。これら水素添加樹脂は、一種単独で使用してもよいし、二種以上を組み合わせて使用してもよい。 Specific examples of the hydrogenated resin include Yasuhara Chemical's Clearon P105 (trade name, softening point 105 ° C), Yasuhara Chemical's Clearon P115 (trade name, softening point 115 ° C), Yasuhara Chemical's Clearon P125 (trade name, softening point 125). ℃), Clearon P135 from Yashara Chemical (trade name, softening point 135 ° C), Clearon P150 from Yashara Chemical (trade name, softening point 152 ° C), Clearon M105 from Yashara Chemical (trade name, softening point 105 ° C), Clearon M115 from Yashara Chemical Product name, softening point 115 ° C), Yasuhara Chemical Clearon K100 (trade name, softening point 100 ° C), Yashara Chemical Clearon K110 (product name, softening point 110 ° C), Yashara Chemical Clearon K4100 (product name, softening point) 00 ℃), Yasuhara Chemical made Clearon K4090 (product name, include a softening point of 90 ℃) and the like. These hydrogenated resins may be used individually by 1 type, and may be used in combination of 2 or more type.
本発明のタイヤ用ゴム組成物において、上記水素添加樹脂としては、テルペン樹脂を水添してなる水添テルペン樹脂を用いる。水添テルペン樹脂は、元々ＳＰ値の低いテルペン樹脂を水添しているため、ＳＰ値が特に低い。そのため、水添テルペン樹脂は、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴム等のゴム成分とのＳＰ値の差が特に小さく、本発明の効果が顕著に現れる。なお、軟化点が８０℃未満の水添テルペン樹脂を使用した場合、操縦安定性が悪化する傾向があり、一方、軟化点が１８０℃を超えると水添テルペン樹脂を使用した場合、０℃でのｔａｎδの向上効果が小さく、５０℃でのｔａｎδが高くなってしまう。 In the tire rubber composition of the present invention, a hydrogenated terpene resin obtained by hydrogenating a terpene resin is used as the hydrogenated resin. Since the hydrogenated terpene resin originally hydrogenates a terpene resin having a low SP value, the SP value is particularly low. Therefore, the hydrogenated terpene resin has a particularly small difference in SP value from rubber components such as natural rubber, polyisoprene rubber and polybutadiene rubber, and the effect of the present invention is remarkably exhibited. When a hydrogenated terpene resin having a softening point of less than 80 ° C. is used, steering stability tends to deteriorate. On the other hand, when a softened point exceeds 180 ° C., when a hydrogenated terpene resin is used, The effect of improving tan δ is small, and tan δ at 50 ° C. becomes high.
本発明のタイヤ用ゴム組成物において、上記ゴム成分と上記水素添加樹脂のＳＰ値の差は、１．５以下であることが好ましい。上記ゴム成分と上記水素添加樹脂のＳＰ値の差が１．５以下の場合、ゴム成分と水素添加樹脂の相溶性が特に良好であるため、本発明の効果が顕著に現れ、転がり抵抗等の他の性能を悪化させること無く、ウェットグリップ性能を大幅に向上させることができる。 In the tire rubber composition of the present invention, the difference in SP value between the rubber component and the hydrogenated resin is preferably 1.5 or less. When the difference in SP value between the rubber component and the hydrogenated resin is 1.5 or less, the compatibility between the rubber component and the hydrogenated resin is particularly good, so that the effects of the present invention are remarkably exhibited, such as rolling resistance. The wet grip performance can be greatly improved without deteriorating other performance.
また、本発明のタイヤ用ゴム組成物には、補強性充填剤として、カーボンブラック、シリカ、アルミナ、水酸化アルミニウム、炭酸カルシウム、酸化チタン等を配合することができ、これらの中でも、カーボンブラック及び／又はシリカを配合することが好ましい。これら補強性充填剤は、一種単独で使用してもよいし、二種以上を組み合わせて使用してもよい。 The tire rubber composition of the present invention may contain carbon black, silica, alumina, aluminum hydroxide, calcium carbonate, titanium oxide, etc. as a reinforcing filler. Among these, carbon black and It is preferable to blend silica. These reinforcing fillers may be used alone or in combination of two or more.
更に、本発明のタイヤ用ゴム組成物には、上記ゴム成分、水素添加樹脂、補強性充填剤の他に、ゴム工業界で通常使用される配合剤、例えば、軟化剤、老化防止剤、カップリング剤、加硫促進剤、加硫促進助剤、加硫剤等を、本発明の目的を害しない範囲内で適宜選択して、通常の配合量の範囲内で配合することができる。これら配合剤としては、市販品を好適に使用することができる。なお、本発明のタイヤ用ゴム組成物は、ゴム成分に、水素添加樹脂と、必要に応じて適宜選択した各種配合剤とを配合して、混練り、熱入れ、押出等することにより製造することができる。 In addition to the rubber component, hydrogenated resin, and reinforcing filler, the rubber composition for tires of the present invention includes compounding agents commonly used in the rubber industry, such as softeners, anti-aging agents, cups A ring agent, a vulcanization accelerator, a vulcanization acceleration aid, a vulcanizing agent, and the like can be appropriately selected within a range that does not impair the object of the present invention, and can be blended within a normal blending amount range. As these compounding agents, commercially available products can be suitably used. The rubber composition for tires of the present invention is produced by blending a rubber component with a hydrogenated resin and various compounding agents appropriately selected as necessary, kneading, heating, extruding, and the like. be able to.
また、本発明のタイヤは、上述したタイヤ用ゴム組成物をトレッド部材に用いたことを特徴とする。本発明のタイヤは、上述のゴム組成物をトレッド部材に用いて生タイヤを成形し、常法に従って生タイヤを加硫することで製造できる。なお、本発明のタイヤのトレッド部材には、上述のタイヤ用ゴム組成物が用いられているため、本発明のタイヤは、転がり抵抗等の他の性能が十分に確保されている上、ウェットグリップ性能が特に良好である。また、本発明のタイヤに充填する気体としては、通常の或いは酸素分圧を調整した空気の他、窒素、アルゴン、ヘリウム等の不活性ガスを用いることができる。 The tire of the present invention is characterized by using the tire rubber composition described above for a tread member. The tire of the present invention can be produced by forming a green tire using the above rubber composition as a tread member and vulcanizing the green tire according to a conventional method. In addition, since the tire rubber composition described above is used for the tread member of the tire of the present invention, the tire of the present invention has sufficiently secured other performance such as rolling resistance, and a wet grip. The performance is particularly good. Moreover, as gas with which the tire of the present invention is filled, an inert gas such as nitrogen, argon, helium, etc. can be used in addition to normal or air having an adjusted oxygen partial pressure.
以下に、実施例を挙げて本発明を更に詳しく説明するが、本発明は下記の実施例に何ら限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.
＜ゴム組成物の調製及び評価＞
表１〜４に示す配合処方に従って、バンバリーミキサーを用いて混練配合して、タイヤ用ゴム組成物を調製した。得られたタイヤ用ゴム組成物を１４５℃で４５分間加硫した後、下記に示す各種測定を行った。結果を表１〜４に示す。
<Preparation and evaluation of rubber composition>
A rubber composition for tires was prepared by kneading and compounding using a Banbury mixer in accordance with the formulation shown in Tables 1 to 4. The obtained tire rubber composition was vulcanized at 145 ° C. for 45 minutes, and then subjected to various measurements shown below. The results are shown in Tables 1-4.
（１）ｔａｎδ
ＪＩＳ Ｋ６３９４に従って、０℃及び５０℃でのｔａｎδを測定し、比較例１〜５に関しては、比較例１の０℃及び５０℃でのｔａｎδの値をそれぞれ１００として指数表示し、比較例６及び比較例１５に関しては、比較例６の０℃及び５０℃でのｔａｎδの値をそれぞれ１００として指数表示し、比較例７及び実施例２に関しては、比較例７の０℃及び５０℃でのｔａｎδの値をそれぞれ１００として指数表示し、比較例８〜１１及び実施例３、５、６及び８、並びに、参考例４及び７に関しては、比較例８の０℃及び５０℃でのｔａｎδの値をそれぞれ１００として指数表示し、比較例１２〜１４、実施例９、１１、１２、１４及び１５、並びに、参考例１０及び１３に関しては、比較例１２の０℃及び５０℃でのｔａｎδの値をそれぞれ１００として指数表示した。０℃でのｔａｎδに関しては、指数値が大きい程、ウェットグリップ性が良好であることを示し、５０℃でのｔａｎδに関しては、指数値が小さい程、転がり抵抗が小さいことを示す。
(1) tan δ
According to JIS K6394, tan δ at 0 ° C. and 50 ° C. was measured, and for Comparative Examples 1 to 5, the values of tan δ at 0 ° C. and 50 ° C. in Comparative Example 1 were each indicated as 100, and Comparative Example 6 and For Comparative Example 15, the values of tan δ at 0 ° C. and 50 ° C. of Comparative Example 6 are shown as indexes, respectively, and for Comparative Example 7 and Example 2, tan δ of Comparative Example 7 at 0 ° C. and 50 ° C. The values of tan δ at 0 ° C. and 50 ° C. of Comparative Example 8 were compared with respect to Comparative Examples 8 to 11 and Examples 3, 5, 6 and 8, and Reference Examples 4 and 7. Is expressed as an index, and the values of tan δ at 0 ° C. and 50 ° C. of Comparative Example 12 are shown for Comparative Examples 12 to 14, Examples 9, 11, 12, 14 and 15, and Reference Examples 10 and 13. 1 each The index was displayed as 00. Regarding tan δ at 0 ° C., the larger the index value, the better the wet grip property, and regarding tan δ at 50 ° C., the smaller the index value, the smaller the rolling resistance.
（２）ウェットグリップ性
スタンレイロンドンタイプのポータブルスキッドテスターにて湿潤路面を加硫ゴム試験片で擦った際の抵抗値を測定し、比較例１〜５に関しては、比較例１の抵抗値を１００として指数表示し、比較例６及び比較例１５に関しては、比較例６の抵抗値を１００として指数表示し、比較例７及び実施例２に関しては、比較例７の抵抗値を１００として指数表示し、比較例８〜１１、実施例３、５、６及び８、並びに、参考例４及び７に関しては、比較例８の抵抗値を１００として指数表示し、比較例１２〜１４、実施例９、１１、１２、１４及び１５、並びに、参考例１０及び１３に関しては、比較例１２の抵抗値を１００として指数表示した。指数値が大きい程、抵抗値が大きく、ウェットグリップ性が良好であることを示す。
(2) Wet grip property The resistance value when the wet road surface was rubbed with a vulcanized rubber test piece with a Stanley London type portable skid tester was measured, and for Comparative Examples 1 to 5, the resistance value of Comparative Example 1 was 100. As for Comparative Example 6 and Comparative Example 15, the resistance value of Comparative Example 6 is displayed as an index, and as for Comparative Example 7 and Example 2, the resistance value of Comparative Example 7 is displayed as an index. Comparative Examples 8 to 11, Examples 3, 5, 6 and 8, and Reference Examples 4 and 7 are indicated by an index with the resistance value of Comparative Example 8 as 100, and Comparative Examples 12 to 14, Example 9, For 11, 12, 14 and 15, and Reference Examples 10 and 13, the resistance value of Comparative Example 12 was taken as 100 and indicated as an index. The larger the index value, the larger the resistance value and the better the wet grip property.
＜タイヤの作製及び評価＞
更に、比較例８、１０及び１２、実施例３、５、９、１２及び１４、並びに、参考例４のゴム組成物をトレッドゴムとして用いてサイズ：１８５／７０Ｒ１４の空気入りタイヤ（トレッド：一層構造）を試作し、下記の方法でウェット性能テストを行った。結果を表３〜４に示す。
<Production and evaluation of tire>
Further, a pneumatic tire having a size of 185 / 70R14 (tread: one layer) using the rubber compositions of Comparative Examples 8, 10, and 12, Examples 3, 5, 9, 12, and 14, and Reference Example 4 as tread rubber. Structure) was prototyped and a wet performance test was conducted by the following method. The results are shown in Tables 3-4.
（３）ウェット性能テスト（タイヤ）
上記タイヤを車軸に装着し、水深１ ｃｍの湿潤路面を時速６０ ｋｍで走行中にブレーキをかけてから車輌が完全に停止するまでの距離を測定した。結果は、比較例８及び１０、実施例３及び５、並びに、参考例４に関しては、比較例８の停止距離を１００として指数表示し、比較例１２並びに実施例９、１２及び１４に関しては、比較例１２の停止距離を１００として指数表示した。指数値が大きい程、停止するまでの距離が短く、ウェットグリップ性に優れることを示す。
(3) Wet performance test (tire)
The tire was mounted on an axle, and the distance from when the brake was applied to when the vehicle completely stopped was measured while traveling on a wet road surface with a depth of 1 cm at a speed of 60 km / h. As for the results of Comparative Examples 8 and 10, Examples 3 and 5, and Reference Example 4, the stop distance of Comparative Example 8 is shown as an index, and for Comparative Example 12 and Examples 9, 12, and 14, The stop distance of Comparative Example 12 was taken as 100 and displayed as an index. The larger the index value, the shorter the distance to stop and the better the wet grip property.
＊１ ジェイ・エスアール（株）製、＃１５００
＊２ ＳＡＦ、窒素吸着比表面積（Ｎ2ＳＡ）：１５０ ｍ2／ｇ
＊３ テルペン樹脂、ＹＳレジンＰＸ１０００（ヤスハラケミカル製、軟化点１００℃）
＊４ 水添テルペン樹脂、クリアロンＰ１０５（ヤスハラケミカル製、軟化点１０５℃）
＊５ Ｃ９樹脂、日石ネオポリマーＬ９０（新日本石油化学製、軟化点９０℃）
＊６ 水添Ｃ９樹脂、アルコンＭ１００（荒川化学社製、軟化点１００℃）
＊７ Ｎ−（１，３−ジメチルブチル）−Ｎ’−フェニル−ｐ−フェニレンジアミン
＊８ Ｎ−ｔ−ブチル−２−ベンゾチアジル−スルフェンアミド
＊９ テトラキス−２−エチルヘキシルチウラムジスルフィド
＊１０ カーボンブラックＮ２２０（東海カーボン社製シースト６）
＊１１ 水添テルペン樹脂、クリアロンＭ１０５（ヤスハラケミカル製、軟化点１０５℃）
＊１２ 水添テルペン樹脂、クリアロンＰ１２５（ヤスハラケミカル製、軟化点１２５℃）
＊１３ 水添Ｃ９樹脂、アルコンＰ１００（荒川化学社製、軟化点１００℃）
＊１４ Ｎ，Ｎ’−ジシクロヘキシル−２−ベンゾチアゾリルスルフェンアミド
＊１５ ジェイ・エスアール（株）製、ＢＲ０１
＊１６ 水添テルペン樹脂、クリアロンＰ１５０（ヤスハラケミカル製、軟化点１５２℃）
＊１７ 水添テルペン樹脂、クリアロンＫ４１００（ヤスハラケミカル製、軟化点１００℃）
＊１８ ジベンゾチアジルジスルフィド
* 1 Jay SRL Co., Ltd. # 1500
* 2 SAF, nitrogen adsorption specific surface area (N 2 SA): 150 m 2 / g
* 3 Terpene resin, YS Resin PX1000 (Yasuhara Chemical, softening point 100 ° C)
* 4 Hydrogenated terpene resin, Clearon P105 (manufactured by Yashara Chemical, softening point 105 ° C)
* 5 C9 resin, Nippon Oil Neopolymer L90 (manufactured by Nippon Petrochemical, softening point 90 ° C)
* 6 Hydrogenated C9 resin, Alcon M100 (Arakawa Chemical Industries, softening point 100 ° C)
* 7 N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine * 8 Nt-butyl-2-benzothiazyl-sulfenamide * 9 Tetrakis-2-ethylhexylthiuram disulfide * 10 Carbon black N220 (Toast Carbon Co., Ltd. Seest 6)
* 11 Hydrogenated terpene resin, Clearon M105 (Yasuhara Chemical, softening point 105 ° C)
* 12 Hydrogenated terpene resin, Clearon P125 (manufactured by Yashara Chemical, softening point 125 ° C)
* 13 Hydrogenated C9 resin, Alcon P100 (Arakawa Chemical Industries, softening point 100 ° C)
* 14 N, N'-Dicyclohexyl-2-benzothiazolylsulfenamide * 15 BR01, manufactured by JSR Corporation
* 16 Hydrogenated terpene resin, Clearon P150 (Yasuhara Chemical, softening point 152 ° C)
* 17 Hydrogenated terpene resin, Clearon K4100 (manufactured by Yashara Chemical, softening point 100 ° C)
* 18 Dibenzothiazyl disulfide
表１中の比較例１〜５は、ゴム成分がＳＢＲのみからなる配合である。ゴム成分がＳＢＲのみからなる場合、水素添加樹脂の配合効果は確認できるものの、非常に小さかった。
特に、テルペン樹脂を配合した比較例２と、水添テルペン樹脂を配合した比較例３とでは、殆ど差が見られなかった。なお、Ｃ９樹脂を配合した比較例４と、水添Ｃ９樹脂を配合した比較例５とを比較すると、比較例５の方が若干優れるが、その差は小さかった。
Comparative Examples 1 to 5 in Table 1 are formulations in which the rubber component is composed only of SBR. When the rubber component consisted of only SBR, the compounding effect of the hydrogenated resin could be confirmed but was very small.
In particular, there was almost no difference between Comparative Example 2 in which a terpene resin was blended and Comparative Example 3 in which a hydrogenated terpene resin was blended. In addition, when the comparative example 4 which mix | blended C9 resin and the comparative example 5 which mix | blended hydrogenated C9 resin were compared, the direction of the comparative example 5 was a little superior, but the difference was small.
表２中の比較例６〜７及び１５、並びに、実施例２は、ゴム成分がＮＲとＳＢＲを含む配合である。比較例６に対する比較例１５の結果、及び比較例７に対する実施例２の結果から、ゴム成分中の50質量％以上がＮＲの場合の方が、水添テルペン樹脂の配合効果が大きいことが分かる。従って、ゴム成分中における、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴムの総含有率は、50質量％以上である。 Comparative Examples 6 to 7 and 15 and Table 2 in Table 2 are formulations in which the rubber component contains NR and SBR. From the results of Comparative Example 15 with respect to Comparative Example 6 and the results of Example 2 with respect to Comparative Example 7, it can be seen that the compounding effect of the hydrogenated terpene resin is larger when 50% by mass or more in the rubber component is NR. . Therefore, the total content of natural rubber, polyisoprene rubber and polybutadiene rubber in the rubber component is 50% by mass or more.
表３中の比較例８〜１１、実施例３、５、６及び８、並びに、参考例４及び７は、ゴム成分がＮＲのみからなる配合である。ゴム成分がＮＲのみからなる場合は、水素添加樹脂の配合効果を十分確認することができた。特に、テルペン樹脂を配合した比較例９と、水添テルペン樹脂を配合した実施例３、５、６及び８とを比較すると、実施例３、５、６及び８の方が、０℃でのｔａｎδが高く、ウェットグリップ性が優れることが分かる。更に、水添テルペン樹脂を配合した実施例３、５、６及び８は、転がり抵抗の指標の一つである５０℃でのｔａｎδが比較例８〜１１と同等以下であるため、実施例３、５、６及び８のゴム組成物をトレッド部材に用いても、タイヤの転がり抵抗が悪化しないことが分かる。また更に、比較例８及び１０と、実施例３及び５の結果から、実際にタイヤに使用してみても、水添テルペン樹脂を配合したゴム組成物をトレッドに使用することで、タイヤのウェットグリップ性が向上することが確認できた。 Comparative Examples 8 to 11, Examples 3, 5, 6, and 8, and Reference Examples 4 and 7 in Table 3 are blends in which the rubber component is composed only of NR. When the rubber component consisted only of NR, the compounding effect of the hydrogenated resin could be sufficiently confirmed. In particular, when Comparative Example 9 containing a terpene resin was compared with Examples 3, 5, 6 and 8 containing a hydrogenated terpene resin, Examples 3, 5, 6 and 8 were at 0 ° C. It can be seen that tan δ is high and wet grip properties are excellent. Furthermore, in Examples 3, 5, 6 and 8 in which hydrogenated terpene resin was blended, tan δ at 50 ° C., which is one of the indexes of rolling resistance, was equal to or less than that of Comparative Examples 8 to 11. It can be seen that the rolling resistance of the tire does not deteriorate even when the rubber compositions of 5, 6 and 8 are used for the tread member. Furthermore, from the results of Comparative Examples 8 and 10 and Examples 3 and 5, even when actually used for a tire, the rubber composition containing the hydrogenated terpene resin was used for the tread, so that the tire wet. It was confirmed that the grip performance was improved.
表４中の比較例１２〜１４、実施例９、１１、１２、１４及び１５、並びに、参考例１０及び１３は、ゴム成分がＮＲとＢＲを含む配合である。ゴム成分がＮＲとＢＲを含む場合も、水素添加樹脂の配合効果を十分確認することができた。特に、テルペン樹脂を配合した比較例１３と、水添テルペン樹脂を配合した実施例９、１１、１２、１４及び１５とを比較すると、実施例９、１１、１２、１４及び１５の方が、０℃でのｔａｎδが高く、ウェットグリップ性が優れることが分かる。更に、水添テルペン樹脂を配合した実施例９、１１、１２、１４及び１５は、転がり抵抗の指標の一つである５０℃でのｔａｎδが比較例１２〜１４と同等以下であり、実施例９、１１、１２、１４及び１５のゴム組成物をトレッド部材に用いても、タイヤの転がり抵抗が悪化しないことが分かる。また更に、比較例１２と、実施例９、１２及び１４の結果から、実際にタイヤに使用してみても、水添テルペン樹脂を配合したゴム組成物をトレッドに使用することで、タイヤのウェットグリップ性が向上することが確認できた。 In Comparative Examples 12 to 14, Tables 9, 11, 12, 14, and 15, and Reference Examples 10 and 13 in Table 4, the rubber components contain NR and BR. Even when the rubber component contained NR and BR, the compounding effect of the hydrogenated resin could be sufficiently confirmed. In particular, when Comparative Example 13 containing a terpene resin and Examples 9, 11, 12, 14 and 15 containing a hydrogenated terpene resin were compared, Examples 9, 11, 12, 14 and 15 were It can be seen that tan δ at 0 ° C. is high and wet grip properties are excellent. Furthermore, Examples 9, 11, 12, 14 and 15 blended with hydrogenated terpene resin have tan δ at 50 ° C., which is one of the indexes of rolling resistance, equal to or less than that of Comparative Examples 12-14. It can be seen that even when the rubber compositions of 9, 11, 12, 14, and 15 are used for the tread member, the rolling resistance of the tire does not deteriorate. Furthermore, from the results of Comparative Example 12 and Examples 9, 12 and 14, even when actually used for a tire, the use of a rubber composition blended with a hydrogenated terpene resin in a tread makes it possible to wet the tire. It was confirmed that the grip performance was improved.
Claims (3)
前記水素添加樹脂が、テルペン樹脂を水添してなる水添テルペン樹脂、又は、芳香族変性テルペン樹脂を水添してなる芳香族変性水添テルペン樹脂であり、
前記水添テルペン樹脂又は前記芳香族変性水添テルペン樹脂の軟化点が８０〜１８０℃であり、
前記ゴム成分中における、天然ゴム、ポリイソプレンゴム及びポリブタジエンゴムの総含有率が５０質量％以上であることを特徴とするタイヤ用ゴム組成物。 To 100 parts by mass of a rubber component containing at least one selected from the group consisting of natural rubber, polyisoprene rubber and polybutadiene rubber, 0.5 parts by mass or more and 50 parts by mass or less of hydrogenated resin is blended,
The hydrogenated resin is a hydrogenated terpene resin obtained by hydrogenating a terpene resin , or an aromatic modified hydrogenated terpene resin obtained by hydrogenating an aromatic modified terpene resin ,
The softening point of the hydrogenated terpene resin or the aromatic-modified hydrogenated terpene resin is 80 to 180 ° C.,
A rubber composition for tires, wherein the total content of natural rubber, polyisoprene rubber and polybutadiene rubber in the rubber component is 50% by mass or more.
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