| abstract |
A tread mix comprising a cross-linkable unsaturated-chain polymer base; curing agents; silica; and a silane bonding agent; said mix being characterized in that said polymer base comprises a first SBR rubber comprising 20-40 % of a first fraction with a mean molecular weight of 50-100x10 3 and a molecular weight distribution of ≤1.5, and 80-60 % of a second fraction with a mean molecular weight of 800-1500x10 3 and a molecular weight distribution of ≤3.0; and in that said silane bonding agent is a mercaptosilane of formula (I): n SH(CH 2 ) 1 SiR 1 R 2 n 2 , where : 1 is an integer of 1 to 6 , R 1 is -0(CH 2 ) g CH 3 , R 2 is -0(CH 2 CH 2 0) m (CH2) n CH 3 , g is an integer of 0 to 5, m is an integer of 2 to 8, and n is an integer of 3 to 20. |