parts of the rubber raw material 10 wt parts of the reactive layered silicate and 1 wt part of dm were used to prepare the rubber mixture the following table 4 2 shows constitutional ingredients of the specimen in example 16 reactive rubber vbc_sbr available from kumho petrochemical co ltd which comprises 18 5 of styrene 5 of vbc and 76 5 of butadiene reactive rubber vbc_sbr available from kumho petrochemical co ltd which comprises 18 5 of styrene 5 of vbc and 76 5 of butadiene for the rubber specimens prepared in comparative examples 2 and 3 and examples 10 to 16 various properties including air permeation resistance dispersibility and wear resistance index were measured according to astm standards and the results are listed in the following table 5 air permeation resistance index represented by air permeability measured in each of comparative example 3 examples 10 to 16 air permeability measured in comparative example 2 u00d7 100 wherein air permeability measured in comparative example 2 is 9 98e u2212 16 m4 sec n and air permeation improves as the air permeation resistance index is decreased wear resistance index shows each of wear resistance values of the rubber specimens prepared in comparative example 3 and examples 10 to 16 relative to a wear resistance value of 100.