JP2005213486A - Rubber composition for under-tread and pneumatic tire using the same - Google Patents
Rubber composition for under-tread and pneumatic tire using the same Download PDFInfo
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- 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
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Abstract
Description
本発明は、空気入りタイヤにおいて使用されるアンダートレッド用ゴム組成物に関する。より詳細には、本発明は、加硫前に良好な粘着性及び流動性を有し、加硫後に低い発熱性を有する、空気入りタイヤにおいて使用されるアンダートレッド用ゴム組成物に関する。また、本発明は、上述のゴム組成物がアンダートレッドにおいて使用されている空気入りタイヤにも関する。 The present invention relates to a rubber composition for undertread used in a pneumatic tire. More specifically, the present invention relates to a rubber composition for an under tread used in a pneumatic tire having good tackiness and fluidity before vulcanization and low exothermicity after vulcanization. The present invention also relates to a pneumatic tire in which the above rubber composition is used in an under tread.
空気入りタイヤのアンダートレッドにおいて使用されるゴム組成物には、タイヤ成形時の作業性の向上を目的として、種々の添加剤が添加される。かかる添加剤の具体例としては、アンダートレッドの下に配置されるベルト材又はベルトカバー材との適度な粘着性を確保することを目的とする粘着性付与剤、ゴム組成物の低粘度化を目的とするオイル、並びに流動性の向上及びスウェルの改良を主目的とする液状ゴム等が挙げられる。 Various additives are added to the rubber composition used in the undertread of a pneumatic tire for the purpose of improving workability during tire molding. Specific examples of such additives include tackifiers for the purpose of ensuring appropriate tackiness with the belt material or belt cover material disposed under the under tread, and reducing the viscosity of the rubber composition. Examples of the target oil and liquid rubbers mainly intended to improve fluidity and swell.
しかしながら、上記の如き手法により成形作業性を向上させようとすると、加硫後のゴム組成物の発熱性が増大し、タイヤとしての転がり抵抗が増大することにつながることが多く、当該技術分野においては、良好な成形作業性及び発熱性を兼備するアンダートレッド用ゴム組成物に対する継続的な要求が存在する。 However, when trying to improve the molding workability by the method as described above, the exothermic property of the rubber composition after vulcanization increases, often leading to an increase in rolling resistance as a tire. There is a continuing need for a rubber composition for undertread that combines good moldability and exothermic properties.
この出願の発明に関連する先行技術文献情報としては次のものがある。
本発明の目的は、加硫前に良好な粘着性及び流動性を有し、加硫後に低い発熱性を有する、空気入りタイヤにおいて使用されるアンダートレッド用ゴム組成物を提供することである。本発明の更なる目的は、上述のゴム組成物がアンダートレッドにおいて使用されている空気入りタイヤを提供することである。 An object of the present invention is to provide a rubber composition for an under tread used in a pneumatic tire having good adhesiveness and fluidity before vulcanization and low exothermicity after vulcanization. A further object of the present invention is to provide a pneumatic tire in which the above rubber composition is used in an undertread.
上記目的は、少なくとも１種のジエン系ゴムを含んでなるゴム成分１００重量部に対して、−２０℃以下のガラス転移温度（Ｔg ）及び５℃以上の軟化点（Ｔs ）を有する脂肪族炭化水素樹脂を０．５〜５重量部配合してなる、アンダートレッド用ゴム組成物によって達成される。 The object is to provide aliphatic carbonization having a glass transition temperature (Tg) of -20 ° C or lower and a softening point (Ts) of 5 ° C or higher with respect to 100 parts by weight of a rubber component comprising at least one diene rubber. This is achieved by a rubber composition for an under tread comprising 0.5 to 5 parts by weight of a hydrogen resin.
本発明により、加硫前に良好な粘着性及び流動性を有し、加硫後に低い発熱性を有する、空気入りタイヤにおいて使用されるアンダートレッド用ゴム組成物が提供される。本発明に係るゴム組成物をアンダートレッドにおいて使用することにより、良好な成形作業性を確保しつつ、良好な転がり抵抗を有する空気入りタイヤを提供することができる。 According to the present invention, there is provided a rubber composition for an undertread used in a pneumatic tire that has good adhesiveness and fluidity before vulcanization and has low exothermicity after vulcanization. By using the rubber composition according to the present invention in an under tread, it is possible to provide a pneumatic tire having a good rolling resistance while ensuring good molding workability.
本発明は、少なくとも１種のジエン系ゴムを含んでなるゴム成分に対して、特定の脂肪族炭化水素樹脂を特定量配合することにより、加硫前に良好な粘着性及び流動性を有し、加硫後に低い発熱性を有する、空気入りタイヤにおいて使用されるアンダートレッド用ゴム組成物を提供することができることを見出したことに基づくものである。 The present invention has good adhesiveness and fluidity before vulcanization by blending a specific amount of a specific aliphatic hydrocarbon resin into a rubber component comprising at least one diene rubber. This is based on the finding that a rubber composition for undertread used in a pneumatic tire having low exothermic property after vulcanization can be provided.
すなわち、本発明に係るゴム組成物は、少なくとも１種のジエン系ゴムを含んでなるゴム成分１００重量部に対して、−２０℃以下のガラス転移温度（Ｔg ）及び５℃以上の軟化点（Ｔs ）を有する脂肪族炭化水素樹脂を０．５〜５重量部配合してなる、アンダートレッド用ゴム組成物である。 That is, the rubber composition according to the present invention has a glass transition temperature (Tg) of -20 ° C or lower and a softening point of 5 ° C or higher (100 parts by weight of a rubber component comprising at least one diene rubber). A rubber composition for an under tread comprising 0.5 to 5 parts by weight of an aliphatic hydrocarbon resin having Ts).
本発明に係るゴム組成物のゴム成分において使用されるゴムとしては、特に限定されないが、天然ゴム（ＮＲ）またはジエン系合成ゴムのいずれか、あるいはこれらの混合系を用いることができる。ジエン系合成ゴムとしては、例えば、各種ブタジエンゴム（ＢＲ）、各種スチレン−ブタジエン共重合体ゴム（ＳＢＲ）、ポリイソプレンゴム（ＩＲ）、アクリロニトリル−ブタジエンゴム、クロロプレンゴム、エチレン−プロピレン−ジエン共重合体ゴム、スチレン−イソプレン共重合体ゴム、スチレン−イソプレン−ブタジエン共重合体ゴム、イソプレン−ブタジエン共重合体ゴム等が挙げられる。 The rubber used in the rubber component of the rubber composition according to the present invention is not particularly limited, and any of natural rubber (NR) and diene synthetic rubber, or a mixed system thereof can be used. Examples of the diene-based synthetic rubber include various butadiene rubbers (BR), various styrene-butadiene copolymer rubbers (SBR), polyisoprene rubber (IR), acrylonitrile-butadiene rubber, chloroprene rubber, and ethylene-propylene-diene copolymer. Examples thereof include a combined rubber, a styrene-isoprene copolymer rubber, a styrene-isoprene-butadiene copolymer rubber, and an isoprene-butadiene copolymer rubber.
本発明に係るゴム組成物において上記ゴム成分に対して配合される上記脂肪族炭化水素樹脂は、上述の粘着性付与剤として機能するものである。当該技術分野において一般的に使用されている粘着性付与剤の具体例としては、各種アルキルフェノール樹脂等が挙げられるけれども、本発明に係るゴム組成物においては、上記に規定されている物性を満足する脂肪族炭化水素樹脂が上記ゴム成分に対して配合されなければならない。 The said aliphatic hydrocarbon resin mix | blended with respect to the said rubber component in the rubber composition which concerns on this invention functions as the above-mentioned tackifier. Specific examples of tackifiers generally used in the technical field include various alkylphenol resins and the like, but the rubber composition according to the present invention satisfies the physical properties defined above. An aliphatic hydrocarbon resin must be blended with the rubber component.
すなわち、本発明に係るゴム組成物において上記ゴム成分に対して配合される上記脂肪族炭化水素樹脂は、−２０℃以下、好ましくは−２０〜−５０℃のガラス転移温度（Ｔg ）及び５℃以上、好ましくは５〜３０℃の軟化点（Ｔs ）を有する脂肪族炭化水素樹脂でなければならない。上記ガラス転移温度（Ｔg ）が−２０℃を超える場合には、粘着性付与剤としての機能が低下するので好ましくなく、上記軟化点（Ｔs ）が５℃未満である場合には、ゴム組成物の流動性が向上しないので好ましくない。 That is, the aliphatic hydrocarbon resin blended with the rubber component in the rubber composition according to the present invention has a glass transition temperature (Tg) of -20 ° C or lower, preferably -20 to -50 ° C, and 5 ° C. The aliphatic hydrocarbon resin should preferably have a softening point (Ts) of 5 to 30 ° C. When the glass transition temperature (Tg) exceeds -20 ° C, the function as a tackifier is lowered, which is not preferable. When the softening point (Ts) is less than 5 ° C, a rubber composition is used. This is not preferable because the fluidity of the liquid is not improved.
更に、本発明に係るゴム組成物における上記脂肪族炭化水素樹脂の配合量は、上記ゴム成分１００重量部に対して、０．５〜５重量部、好ましくは１〜３重量部でなければならない。上記配合量が０．５重量部未満である場合には、加硫前のゴム組成物の粘着性が不十分となり、所望の成形作業性の改良効果を得ることができず、逆に５重量部を超える場合には、加硫前のゴム組成物の粘着性が過大となり、結果として成形作業性を改良することができないので好ましくない。 Furthermore, the blending amount of the aliphatic hydrocarbon resin in the rubber composition according to the present invention should be 0.5 to 5 parts by weight, preferably 1 to 3 parts by weight with respect to 100 parts by weight of the rubber component. . When the blending amount is less than 0.5 parts by weight, the rubber composition before vulcanization has insufficient adhesiveness, and the desired improvement in molding workability cannot be obtained. When the amount exceeds 50 parts, the tackiness of the rubber composition before vulcanization becomes excessive, and as a result, the molding workability cannot be improved.
本発明に係るゴム組成物には、更に、充填材（カーボンブラック、シリカ等）、プロセスオイル、可塑剤、軟化剤、加硫剤、加硫助剤、加硫促進剤、加硫活性化剤、老化防止剤等、及び／又はゴム配合技術分野において一般的に使用される他の各種添加剤を配合することができる。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 according to the present invention further includes a filler (carbon black, silica, etc.), process oil, plasticizer, softener, vulcanizing agent, vulcanization aid, vulcanization accelerator, and vulcanization activator. , Anti-aging agents, and / or other various additives generally used in the rubber compounding technical field. 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.
本発明に係るゴム組成物は、公知のゴム用混練機械（例えば、ロール、バンバリーミキサー、ニーダー等）を使用して、上記各成分を混合することによって製造することができる。 The rubber composition according to the present invention can be produced by mixing the above components using a known rubber kneading machine (for example, a roll, a Banbury mixer, a kneader, etc.).
上述の如く、本発明に係るゴム組成物は、加硫前には良好な粘着性及び流動性が要求され、加硫後には低い発熱性が要求される、空気入りタイヤにおけるアンダートレッド用ゴム組成物として有用である。すなわち、本発明に係るゴム組成物をアンダートレッドにおいて使用することにより、従来技術のアンダートレッド用ゴム組成物と比較して良好な成形作業性を確保しつつ、良好な転がり抵抗を有する空気入りタイヤを提供することができる。 As described above, the rubber composition according to the present invention is required to have good adhesiveness and fluidity before vulcanization, and low exothermicity after vulcanization. Useful as a product. That is, by using the rubber composition according to the present invention in an under tread, a pneumatic tire having a good rolling resistance while ensuring good molding workability as compared with a rubber composition for a conventional under tread. Can be provided.
以下に記載する比較例及び実施例によって本発明を更に詳しく説明するけれども、本発明の技術的範囲は、これらの例に限定されるものではない。 Although the present invention will be described in more detail with reference to comparative examples and examples described below, the technical scope of the present invention is not limited to these examples.
比較例１〜５並びに実施例１及び２
配合成分
後述する各種試験片の調製において使用される各種配合成分を、以下に列記する。
Comparative Examples 1-5 and Examples 1 and 2
Compounding components Various compounding components used in the preparation of various test pieces described later are listed below.
天然ゴム（ＮＲ）：ＲＳＳ ３号
ブタジエンゴム（ＢＲ）：日本ゼオン株式会社製「Ｎｉｐｏｌ ＢＲ１２２０」
カーボンブラック（ＣＢ）：昭和キャボット株式会社製「ショウブラック Ｎ５５０」（ＦＥＦ級）
老化防止剤（６Ｃ）：住友化学工業株式会社製「アンチゲン ６Ｃ」（Ｎ−フェニル−Ｎ’−１，３−ジメチルブチル−ｐ−フェニレンジアミン）
亜鉛華：正同化学工業株式会社製「酸化亜鉛 ３種」
ステアリン酸：日本油脂株式会社製「ビーズステアリン酸」
硫黄：鶴見化学工業株式会社「金華印５％油入微粉硫黄」
加硫促進剤（ＣＺ）：大内新興化学工業株式会社製「ノクセラー ＣＺ−Ｇ」（Ｎ−シクロヘキシル−２−べンゾチアゾリルスルフェンアミド）
Natural rubber (NR): RSS No. 3 Butadiene rubber (BR): “Nipol BR1220” manufactured by Nippon Zeon Co., Ltd.
Carbon black (CB): Showa Cabot Co., Ltd. “Show Black N550” (FEF class)
Anti-aging agent (6C): “Antigen 6C” (N-phenyl-N′-1,3-dimethylbutyl-p-phenylenediamine) manufactured by Sumitomo Chemical Co., Ltd.
Zinc Hana: “Zinc oxide 3 types” manufactured by Shodo Chemical Industry Co., Ltd.
Stearic acid: “Bead stearic acid” manufactured by NOF Corporation
Sulfur: Tsurumi Chemical Co., Ltd. “Jinhua seal 5% oil-filled fine sulfur”
Vulcanization accelerator (CZ): “Noxeller CZ-G” (N-cyclohexyl-2-benzothiazolylsulfenamide) manufactured by Ouchi Shinsei Chemical Co., Ltd.
流動性付与剤（ＬＩＲ）：株式会社クラレ製「ＬＩＲ−５０」（液状イソプレンゴム）
粘着性付与剤（ＡＰＲ）：荒川化学工業株式会社製「タマノル ５１０」（アルキルフェノール樹脂）
粘着性付与剤（ＷＴ１０）：Ｇｏｏｄ Ｙｅａｒ Ｃｈｅｍｉｃａｌ社製「Ｗｉｎｇｔａｃｋ １０」（液状脂肪族石油炭化水素樹脂）
Fluidity imparting agent (LIR): Kuraray Co., Ltd. “LIR-50” (liquid isoprene rubber)
Tackifier (APR): “Tamanol 510” (alkylphenol resin) manufactured by Arakawa Chemical Industries, Ltd.
Tackifier (WT10): Good Year Chemical “Wingtack 10” (liquid aliphatic petroleum hydrocarbon resin)
尚、比較用の粘着性付与剤（ＡＰＲ）及び本発明に係る粘着性付与剤（ＷＴ１０）の各種物性値は、以下の表Ｉに記載されている通りである。 Various physical property values of the tackifier for comparison (APR) and the tackifier according to the present invention (WT10) are as described in Table I below.
各種試験片の調製
以下の表IIに示す硫黄及び加硫促進剤以外の成分を、以下の表IIに示す配合量で、１．８Ｌの密閉式バンバリーミキサーで３〜５分間混合混練し、１６０±５℃に達したときにマスターバッチを放出した。このマスターバッチに、以下の表IIに示す配合量の硫黄及び加硫促進剤を添加し、８インチのオープンロールで混練して、比較例１〜５並びに実施例１及び２のゴム組成物を得た。次に、各種ゴム組成物を、１５ｃｍ×１５ｃｍ×０．２ｃｍの金型中で１６０℃において２０分間プレス加硫して、目的とする各種試験片を調製した。
Preparation of various test pieces Ingredients other than sulfur and vulcanization accelerator shown in Table II below were mixed and kneaded for 3 to 5 minutes in a 1.8 L hermetic Banbury mixer in the blending amounts shown in Table II below, 160 The masterbatch was released when ± 5 ° C was reached. To this master batch, sulfur and a vulcanization accelerator having the blending amounts shown in Table II below were added, and kneaded with an 8-inch open roll to produce the rubber compositions of Comparative Examples 1 to 5 and Examples 1 and 2. Obtained. Next, various rubber compositions were press vulcanized at 160 ° C. for 20 minutes in a 15 cm × 15 cm × 0.2 cm mold to prepare various target test pieces.
各種ゴム組成物及び各種試験片の物性測定
上記各種ゴム組成物及び各種試験片の各種物性を、以下の試験方法に従って測定した。
Measurement of physical properties of various rubber compositions and various test pieces Various physical properties of the various rubber compositions and various test pieces were measured according to the following test methods.
１）成形作業性：
実際の空気入りタイヤの製造工程において、ベルト部の上に上記各種ゴム組成物からなるアンダートレッド部を設け、その上に一般的な組成を有するゴム組成物からなるキャップトレッドを貼り付ける際の成形作業性を、比較例１のゴム組成物を対照標準とする以下の基準に従って等級付けした。
1) Molding workability:
In the actual manufacturing process of a pneumatic tire, an under tread portion made of the above-mentioned various rubber compositions is provided on the belt portion, and molding is performed when a cap tread made of a rubber composition having a general composition is attached thereon. Workability was graded according to the following criteria using the rubber composition of Comparative Example 1 as a reference.
良好＝アンダートレッドとキャップトレッドとの間の粘着性が十分にあるものの、キャップトレッドの貼り直しも容易に行うことができる。
普通＝対照標準である比較例１のゴム組成物と同等の成形作業性を有する。
不良＝アンダートレッドとキャップトレッドとの間の粘着性が過大であり、キャップトレッドの貼り直しを行うことが困難である。
Good = Adhesiveness between the undertread and the cap tread is sufficient, but the cap tread can be easily reattached.
It has molding workability equivalent to that of the rubber composition of Comparative Example 1 which is normal = control.
Poor = The adhesiveness between the undertread and the cap tread is excessive, and it is difficult to reattach the cap tread.
２）流動性：
Monsanto Processability Testerを使用して、30秒-1の剪断速度におけるスウェルの測定を行い、比較例１のゴム組成物についての測定値を１００として、流動性の尺度とした。この指数が大きいほど、加硫前のゴム組成物の流動性が不良であり、スウェルが大きいことを意味する。
2) Fluidity:
Using the Monsanto Processability Tester, the swell was measured at a shear rate of 30 seconds- 1 and the measured value for the rubber composition of Comparative Example 1 was taken as 100, which was used as a measure of fluidity. The larger the index, the poorer the fluidity of the rubber composition before vulcanization, and the larger the swell.
３）損失正接（ｔａｎδ）：
上記各種試験片について、周波数２０Ｈｚ、静歪み１０％、動歪み±２％、温度６０℃の条件下で粘弾性スペクトロメーターを使用して、損失正接（ｔａｎδ）を測定し、比較例１の試験片についての測定値を１００とする指数とした。この指数が大きいほど、加硫後のゴム組成物の発熱性が高いことを意味する。
3) Loss tangent (tan δ):
The above test pieces were measured for loss tangent (tan δ) using a viscoelastic spectrometer under the conditions of a frequency of 20 Hz, a static strain of 10%, a dynamic strain of ± 2%, and a temperature of 60 ° C. The measured value for each piece was taken as 100. The larger this index is, the higher the exothermic property of the rubber composition after vulcanization.
各種ゴム組成物及び各種試験片の物性評価
上記各種ゴム組成物及び各種試験片についての上記１）〜３）の各種物性測定の結果もまた、上記表IIに示されている。尚、上記表IIに示されているように、すべての例において、流動性付与剤及び粘着性付与剤以外の全ての成分の配合量は同一である。
Evaluation of Physical Properties of Various Rubber Compositions and Various Test Pieces Results of various physical property measurements of the above 1) to 3) for the various rubber compositions and various test pieces are also shown in Table II. As shown in Table II above, in all examples, the blending amounts of all components other than the fluidity-imparting agent and the tackifier are the same.
比較例１のゴム組成物は、アンダートレッド用ゴム組成物として標準的な組成に対して、粘着性を増大させることを目的として、従来技術の粘着性付与剤（ＡＰＲ）をゴム成分１００重量部に対して２．０重量部配合してなる、対照標準となるゴム組成物である。上述の如く、各種物性の評価においては、当該比較例１のゴム組成物及び試験片を基準として使用した。 The rubber composition of Comparative Example 1 was prepared by adding 100 parts by weight of a conventional tackifier (APR) with a rubber component for the purpose of increasing the tackiness relative to a standard composition as a rubber composition for an under tread. It is a rubber composition to be used as a reference, which is compounded with 2.0 parts by weight based on the weight. As described above, in the evaluation of various physical properties, the rubber composition and the test piece of Comparative Example 1 were used as a reference.
比較例２のゴム組成物は、粘着性付与剤（ＡＰＲ）の配合量を２．０重量部から４．０重量部に増やしたことを除き、比較例１のゴム組成物と同じ組成を有する比較用のゴム組成物である。粘着性付与剤（ＡＰＲ）の配合量を増やした結果、成形作業性は改良されたものの、スウェルが増大し、流動性が悪化すると共に、発熱性も増大した。この発熱性の増大により、タイヤとしての転がり抵抗の増大が予想される。 The rubber composition of Comparative Example 2 has the same composition as the rubber composition of Comparative Example 1 except that the compounding amount of the tackifier (APR) is increased from 2.0 parts by weight to 4.0 parts by weight. It is a rubber composition for comparison. As a result of increasing the compounding amount of the tackifier (APR), the molding workability was improved, but the swell increased, the fluidity deteriorated, and the exothermicity increased. This increase in heat generation is expected to increase the rolling resistance of the tire.
比較例３のゴム組成物は、粘着性と流動性との両立を目的として、ゴム成分１００重量部に対して２．０重量部の流動性付与剤（ＬＩＲ）を更に配合したことを除き、比較例１のゴム組成物と同じ組成を有する比較用のゴム組成物である。流動性付与剤（ＬＩＲ）を配合した結果、比較例２のゴム組成物において認められた流動性の悪化を伴うこと無く成形作業性を改良することができたものの、発熱性については比較例２と同様に増大し、タイヤとしての転がり抵抗の増大が懸念される結果となった。 The rubber composition of Comparative Example 3 was further mixed with 2.0 parts by weight of a fluidity-imparting agent (LIR) with respect to 100 parts by weight of the rubber component for the purpose of achieving both cohesion and fluidity. 2 is a comparative rubber composition having the same composition as the rubber composition of Comparative Example 1. As a result of blending the fluidity-imparting agent (LIR), the molding workability could be improved without the deterioration of fluidity observed in the rubber composition of Comparative Example 2, but the exothermic property was compared with Comparative Example 2. As a result, the increase in rolling resistance as a tire was a concern.
比較例４のゴム組成物は、ゴム成分１００重量部に対して、従来技術の粘着性付与剤（ＡＰＲ）を２．０重量部配合する代わりに、本発明に係る粘着性付与剤（ＷＴ１０）を０．４重量部配合したことを除き、比較例１のゴム組成物と同じ組成を有する比較用のゴム組成物である。本発明に係る粘着性付与剤（ＷＴ１０）を配合したものの、その配合量が本発明の規定（ゴム成分１００重量部に対して０．５〜５重量部）を下回るため所望の改良効果が得られず、加硫前の成形作業性及び流動性並びに加硫後の発熱性のいずれもが、比較例１と同等レベルに留まった。 The rubber composition of Comparative Example 4 is a tackifier (WT10) according to the present invention, instead of blending 2.0 parts by weight of a conventional tackifier (APR) with 100 parts by weight of a rubber component. This is a comparative rubber composition having the same composition as the rubber composition of Comparative Example 1 except that 0.4 part by weight of is added. Although the tackifier (WT10) according to the present invention is blended, the desired improvement effect is obtained because the blending amount is less than the provisions of the present invention (0.5 to 5 parts by weight with respect to 100 parts by weight of the rubber component). Thus, the molding workability and fluidity before vulcanization and the exothermicity after vulcanization remained at the same level as in Comparative Example 1.
一方、実施例１のゴム組成物は、本発明に係る粘着性付与剤（ＷＴ１０）の配合量を０．４重量部から２．０重量部に増やしたことを除き、比較例４のゴム組成物と同じ組成を有する、本発明に係るゴム組成物である。本発明に係る粘着性付与剤（ＷＴ１０）を本発明の規定を満足する量で配合した結果、加硫前の成形作業性及び流動性並びに加硫後の発熱性の全ての物性を同時に改良することに成功した。 On the other hand, the rubber composition of Example 1 was the same as that of Comparative Example 4 except that the compounding amount of the tackifier (WT10) according to the present invention was increased from 0.4 parts by weight to 2.0 parts by weight. The rubber composition according to the present invention has the same composition as the product. As a result of blending the tackifier (WT10) according to the present invention in an amount satisfying the provisions of the present invention, all physical properties of molding workability and fluidity before vulcanization and exothermicity after vulcanization are simultaneously improved. Succeeded.
また、実施例２のゴム組成物は、本発明に係る粘着性付与剤（ＷＴ１０）の配合量を２．０重量部から４．０重量部に更に増やしたことを除き、実施例１のゴム組成物と同じ組成を有する、本発明に係るゴム組成物である。この例における粘着性付与剤（ＷＴ１０）の配合量もまた本発明の規定を満足するものであり、その結果、実施例１とほぼ同等の良好な結果を得ることができた。 The rubber composition of Example 2 was the same as that of Example 1 except that the compounding amount of the tackifier (WT10) according to the present invention was further increased from 2.0 parts by weight to 4.0 parts by weight. It is a rubber composition according to the present invention having the same composition as the composition. The blending amount of the tackifier (WT10) in this example also satisfies the provisions of the present invention, and as a result, good results almost equivalent to those of Example 1 could be obtained.
更に、比較例５のゴム組成物は、本発明に係る粘着性付与剤（ＷＴ１０）の配合量を４．０重量部から６．０重量部に大幅に増やしたことを除き、実施例２のゴム組成物と同じ組成を有する比較用のゴム組成物である。この例における粘着性付与剤（ＷＴ１０）の配合量は本発明の規定を上回る過剰なものであり、その結果、加硫前の流動性及び加硫後の発熱性については実施例１及び２を凌ぐ良好なレベルであったものの、加硫前の粘着性が過大となり、成形作業性が悪化した。 Furthermore, the rubber composition of Comparative Example 5 was the same as that of Example 2 except that the compounding amount of the tackifier (WT10) according to the present invention was significantly increased from 4.0 parts by weight to 6.0 parts by weight. It is a comparative rubber composition having the same composition as the rubber composition. The compounding amount of the tackifier (WT10) in this example is excessive in excess of the provisions of the present invention. As a result, Examples 1 and 2 are used for fluidity before vulcanization and exothermicity after vulcanization. Although it was a good level that surpassed, the tackiness before vulcanization became excessive, and the molding workability deteriorated.
以上の評価結果から、本発明において規定されているように、少なくとも１種のジエン系ゴムを含んでなるゴム成分に対して、特定の脂肪族炭化水素樹脂を特定量配合することにより、加硫前に良好な粘着性及び流動性を有し、加硫後に低い発熱性を有する、空気入りタイヤにおいて使用されるアンダートレッド用ゴム組成物を提供することができることが明らかとなった。 From the above evaluation results, as specified in the present invention, a specific amount of a specific aliphatic hydrocarbon resin is blended with a rubber component comprising at least one diene rubber, thereby vulcanizing. It has been found that it is possible to provide a rubber composition for an under tread used in a pneumatic tire having good tackiness and fluidity before and having low exothermicity after vulcanization.
Claims (2)
A pneumatic tire, wherein the rubber composition according to claim 1 is used in an under tread.
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