| 摘要 |
<p>The invention concerns a rubber composition having reduced hysteresis for use in a crown ply reinforcement of a tyre casing designed to bear heavy loads. The inventive rubber composition comprises an elastomer matrix containing natural rubber or a synthetic polyisoprene as major constituent, and a reinforcing filler containing carbon black, and is such that said carbon black simultaneously fulfils the following conditions: (i) 45 ≤ CTAB specific surface in m2/g (as per the ASTM D3765-80 standard) ≤ 70; (ii) 45 ≤ BET specific surface in m2/g (as per the ASTM D4820-93 standard) ≤ 70; (iii) 45 ≤ iodine absorption index IA in mg/g (as per the ASTM D1510-81 standard) ≤ 70; (iv) BET surface/IA index ratio ≤ 1.07; (v) 115 ≤ DBP structure value in ml/100g (as per the ASTM D2414-93 standard) ≤ 170; (vi) 85 nm ≤ Stokes dst diameter in nm ≤ 145, wherein dst is the diameter of aggregates corresponding to the maximum frequency of Stokes diameters in an aggregate distribution; and (vii) D50/dst ≤ 0.0090. CTAB + 0.19, wherein D50 is the difference, in the aggregate distribution, between the Stoke diameters of the two aggregates corresponding to a common frequency equal to 50 % of the maximum frequency of Stokes diameters, dst and D50 being measured by centrifugal photo-sedimentation analysis.</p> |
