To provide a rubber composition with low hardness and high vibration absorbency in a wide temperature zone.
The invention relates to the rubber composition comprising (A) 100 pts.mass of a curable rubber component, (B) 10-100 pts.mass of a thermoplastic elastomer composed of an aromatic vinyl-conjugated diene block copolymer and (C) 0.1-20 pts.mass of a crosslinking agent capable of crosslinking the rubber component (A) and the thermoplastic elastomer (B), wherein the thermoplastic elastomer (B) has two or more polyaromatic vinyl blocks and comprises (a) 10-98 mass% of an aromatic vinyl-isoprene block copolymer and (b) 0-85 mass% of an aromatic vinyl-isoprene diblock copolymer and (c) 2-66 mass% of a polyisoprene with 5,000-300,000 of a weight average molecular weight, and the thermoplastic elastomer (B) has 0.2≤tanδ at 0°C and the peak of the tanδ appears at below -20°C.
COPYRIGHT: (C)2008,JPO&INPIT
IKEDA SHINYA
Kishimoto Tatsuto
Tetsuro Hoshino
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