RUBBER COMPOSITION FOR STUDLESS TIRE

摘要

PROBLEM TO BE SOLVED: To provide studless tires high in abrasion resistance and improved in slipproofness on snow/ice-covered road through fully exerting their adhesive friction increasing effect and coefficient of friction-increasing effect even in such a condition that the surface of the snow/ice-covered road is melted and is formed with a water film thereon. SOLUTION: This rubber composition for studless tires is obtained by compounding 100 pts.wt. of a rubber component comprising 40-80 wt.% of a diene-based synthetic rubber <=-70 deg.C in glass transition point and 60-20 wt.% of natural rubber with 1-20 pt(s).wt. of inorganic three-dimensional network porous granules each 10-700μm in size and 20-90 pts.wt. of carbon black 60-135 m2/g in nitrogen absorption specific surface area and having the value of DBP oil absorption greater than that of the nitrogen absorption specific surface area by 30-55.