PROBLEM TO BE SOLVED: To provide a rubber composition for tire belt cushion that comprises carbon black having a specific colloidal property to reduce the heat build-up and also maintains and improves tire durability.SOLUTION: A tire rubber composition comprises, based on 100 pts.mass of diene rubber comprising natural rubber of 80 mass% or more, 10-40 pts.mass of carbon black with a nitrogen adsorption specific surface (NSA) of 90 m/g or less and a compression DBP absorption (24M4) of 95-120 ml/100 g. A ratio between a mode diameter Dst(nm) in a mass distribution curve of a Stokes diameter of an agglomerate of the carbon black and its half width value ΔDst(nm), ΔDst/Dst, is 0.65 or more, and the NSA, (24M4) and Dst satisfy the following formula: (24M4)/Dst<0.0093×NSA-0.06.SELECTED DRAWING: Figure 2
【課題】特定のコロイダル特性を有するカーボンブラックを配合して発熱性を低減しながらタイヤ耐久性を維持・向上するようにしたタイヤベルトクッション用ゴム組成物を提供する。【解決手段】天然ゴムを80質量%以上含むジエン系ゴム100質量部に対し、窒素吸着比表面積N2SAが90m2/g以下、圧縮DBP吸収量(24M4)が95〜120ml/100gのカーボンブラックを10〜40質量部配合すると共に、前記カーボンブラックの凝集体のストークス径の質量分布曲線におけるモード径Dst(nm)およびその半値幅ΔDst(nm)の比ΔDst/Dstが0.65以上であり、前記N2SA、(24M4)およびDstが次式;(24M4)/Dst<0.0093×N2SA−0.06を満たすことを特徴とする。【選択図】図2
RUBBER COMPOSITION FOR TIRE BELT CUSHION
タイヤベルトクッション用ゴム組成物
2017-04-20
Patent
Electronic Resource
Japanese
IPC: | C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen / B60C VEHICLE TYRES , Fahrzeugreifen / C08K Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe , USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS |
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