RUBBER COMPOSITION FOR TIRE, AND PNEUMATIC TIRE

To provide a rubber composition for a tire which is excellent in external damage resistance due to high hardness of rubber and flexural fatigue resistance, and to provide a pneumatic tire.SOLUTION: The rubber composition for a tire contains, based on 100 pts.mass of a diene rubber containing a natur...

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1. Verfasser: KITAMURA OMIMASA
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a rubber composition for a tire which is excellent in external damage resistance due to high hardness of rubber and flexural fatigue resistance, and to provide a pneumatic tire.SOLUTION: The rubber composition for a tire contains, based on 100 pts.mass of a diene rubber containing a natural rubber, more than 50 pts.mass and 80 pts.mass or less of carbon black I having a nitrogen adsorption specific surface area of 55-160 m/g, 3-35 pts.mass in total of an acid-modified polyolefin and a polyamide polyether elastomer, 1.6-3.6 pts.mass of sulfur, and a vulcanization accelerator. The mass ratio (sulfur/vulcanization accelerator) of the sulfur to the vulcanization accelerator is 1.1-3.0. The pneumatic tire is formed using the rubber composition for a tire.SELECTED DRAWING: Figure 1 【課題】ゴムの高硬度化による耐外傷性、及び、耐屈曲疲労性に優れる、タイヤ用ゴム組成物及び空気入りタイヤの提供。【解決手段】天然ゴムを含むジエン系ゴム100質量部に対して、窒素吸着比表面積が55〜160m2/gであるカーボンブラックIを50質量部超80質量部以下、酸変性ポリオレフィン及びポリアミドポリエーテルエラストマーを合計で3〜35質量部、硫黄を1.6〜3.6質量部、並びに、加硫促進剤を含有し、上記加硫促進剤に対する上記硫黄の質量比(硫黄/加硫促進剤)が1.1〜3.0である、タイヤ用ゴム組成物、並びに、上記タイヤ用ゴム組成物を用いて形成された空気入りタイヤ。【選択図】図1