FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing a vulcanised rubber composition, a vulcanised rubber composition and a studless tire. Method comprises: (a) a step for producing a master batch comprising a modified conjugated diene polymer and silicon dioxide, (b) a step for producing a master batch comprising isoprene rubber and silicon dioxide, (c) a step for plasticising the master batch obtained in step (a) and the master batch obtained in step (b), and (d) a vulcanisation step of the plasticised product obtained in step (c), where the obtained vulcanised rubber composition contains: phase A containing a modified conjugated diene polymer and a phase B containing isoprene rubber which are immiscible with each other. Relative content α silicon dioxide in phase A after 200 hours satisfies the following: 0.5 ≤ α ≤ 0.9 - ratio 1, and fraction β modified conjugated diene polymer satisfies the following: 0.4 ≤ β ≤ 0.8 - ratio 2.
EFFECT: invention improves operational properties on ice and wear resistance.
21 cl, 1 tbl, 2 dwg
