| 摘要 |
A composition having a reduced hysteresis which is usable in a crown reinforcement for a heavy-vehicle tire, includes an elastomeric matrix comprising natural rubber or a synthetic polyisoprene in a majority proportion, and a reinforcing filler comprising a carbon black, where the carbon black fulfills the following conditions: (i) 45≰CTAB specific surface area in m2/g≰70, (ii) 45≰BET specific surface area in m2/g≰70, (iii) 45≰iodine adsorption index IA in mg/g≰70, (iv) ratio (BET surface area/index IA)≰1.07, (v) 115≰DBP structure value in ml/100 g≰170, (vi) 85 nm≰Stokes diameter dst in nm≰145, where dst is the diameter of aggregates corresponding to the maximum frequency of the Stokes diameters in a distribution of aggregates, and (vii) D50/dst≰0.0090·CTAB+0.19, where D50 is the difference, in the distribution of aggregates, between the Stokes diameters of two aggregates corresponding to one and the same frequency equal to 50% of the maximum frequency of the Stokes diameters, dst and D50 being measured by centrifugal photosedimentometry. |
