RUBBER COMPOSITION FOR TYRE TREADS

摘要

The invention relates to a cross-linked rubber composition for tyre treads, having a Shore A hardness which is greater than 45 and less than 57 and which is measured in accordance with standard ASTM D 2240. The inventive composition is adapted for icy, snow-covered surfaces and provides the tyre comprising same with improved wear resistance and wet surface adhesion properties. Said composition comprises (pce: parts by weight per 100 parts of elastomer(s)): between 25 pce and 100 pce of one or more diene elastomers each having a temperature Tg of between -75 °C and -40 °C; between 0 pce and 75 pce of one or more diene elastomers each having a temperature Tg of between -110 °C and -75 °C; between 5 pce and 35 pce of at least one hydrocarbon softening resin which is miscible in the aforementioned elastomer(s), said resin having a Tg of between 10 and 150 °C and a molecular mass Mn of between 400 and 2000 g/mol; and between 5 pce and 35 pce of at least one synthetic or natural softening compound comprising at least one fatty acid triester of glycerol, all of the fatty acid(s) containing oleic acid with a mass fraction that is equal to or greater than 60 %.