FIELD: transport.
SUBSTANCE: invention relates to automotive industry. Tread resin is made from resin containing 100 parts by weight of diene resin, 30-100 parts by weight of reinforcing filler including, at least, 10 parts by weight of silicon oxide and 1-20 parts by weight of microcapsules each bearing thermally expandable substance. Besides it comprises silane size introduced into resin composition in amount of 3-15 wt % relative to silicon oxide weight. Shell of every microcapsule is made from thermoplastic resin containing, in fact, nitrile monomer (I). Thermally expandable substance features vapor pressure of 1.4 to 3.0 MPa at 150°C. Mean diameter of microcapsules makes 20-30 mcm before resin composition vulcanisation. Microcapsules expanded due to vulcanisation feature mean diameter of 40-80 mcm. Then, portion of resin tread cells makes 5% to 30%.
EFFECT: higher adhesion on ice.
8 cl, 2 tbl
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