FIELD: chemistry.
SUBSTANCE: invention relates to a caoutchouc composition from diene caoutcoucs, which does not contain zinc or contains less than 0.5 wt.p. of zinc, counted per an elastomer, and suitable for manufacturing pneumatic tyres and tyre treads. The caoutchouc composition contains a diene elastomer, a cross-linking sulphur-based system, one inorganic filling agent as an active filling agent, a blocked mercaptosilane of the general formula (I): (R3O)R2R1-Si-Z-S-C(=O)-A, where R1 and R2, being similar or different, represent monovalent hydrocarbon groups, selected from linear or branched alkyls, cycloalkyls or aryls, containing 1-18 carbon atoms; R3 represents a monovalent hydrocarbon group, selected from linear or branched alkyls, containing 1-4 carbon atoms; A represents hydrogen or a monovalent hydrocarbon group, selected from linear or branched alkyls, cycloalkyls or aryls, containing 1-18 carbon atoms; and Z represents a bivalent binding group, containing 1-18 carbon atoms.
EFFECT: invention makes it possible to reduce the toxicity of caoutchouc compositions and tyres made from them with the preservation of the caoutchouc compositions resistance to subvulcanisation.
20 cl, 2 tbl, 3 ex
