RUBBER COMPOSITION FOR TIRE BEAD INSULATION AND PNEUMATIC TIRE

摘要

A rubber composition for tire bead insulation contains a diene rubber, a nitrone compound having a carboxy group, a carbon black and a white filler. The diene rubber contains a natural rubber and a styrene-butadiene rubber and the mass ratio of the contents of the natural rubber and the butadiene rubber is from 50:50 to 90:10. The content of the nitrone compound is from 0.1 to 10 parts by mass (PBM) per 100 PBM of total content of the diene rubber and the nitrone compound. The content of the carbon black is not less than 70 PBM per 100 PBM of the total above. The content of the white filler is not less than 20 PBM per 100 PBM of the total above. The total content of the carbon black and the white filler is from 90 to 180 PBM per 100 PBM of the total above.

主权项

1. A rubber composition for tire bead insulation comprising a diene rubber, a nitrone compound having a carboxy group, a carbon black and a white filler;
the diene rubber containing a natural rubber and a styrene-butadiene rubber, wherein a mass ratio of a content of the natural rubber and a content of the butadiene rubber is from 50:50 to 90:10; a content of the nitrone compound being from 0.1 to 10 parts by mass per 100 parts by mass of a total content of the diene rubber and the nitrone compound; a content of the carbon black being not less than 70 parts by mass per 100 parts by mass of a total content of the diene rubber and the nitrone compound; a content of the white filler being not less than 20 parts by mass per 100 parts by mass of a total content of the diene rubber and the nitrone compound; and a total content of the carbon black and the white filler being from 90 to 180 parts by mass per 100 parts by mass of a total content of the diene rubber and the nitrone compound.