Patent ID: 7211612
Filing Date: 2007-05-01
Classification: C08K

Abstract:
1. A tread rubber composition containing aluminum hydroxide having an untamped density of not more than 0.60 g/cm 3 , a DOP oil absorption of at least 70 cm 3 /100 g and less than 250 cm 3 /100 g, and a BET specific surface area of at least 30 m 2 /g and not more than 350 m 2 /g in an amount of 5–60 parts by weight with respect to 100 parts by weight of a rubber component containing at least 80% by weight of polyisoprene rubber and/or polybutadiene, wherein a tanδ peak temperature of the tread rubber composition is not more than −51° C., a type A durometer hardness (H3) at 0° C. is from 48 to 55 and a difference (H3−H1) with a type A durometer hardness (H1) at 20° C. is not more than 3.