Antivibration rubber composition

1. An antivibration rubber composition for automobiles containing:

(A) diene rubber;

(B) silica; and

(C) sulfur,

wherein

the Component (A) is at least one selected from a group consisting of natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (SBR) and acrylonitrile-butadiene rubber (NBR),

the amount of the Component (B) contained is set to a range from 10 to 80 parts by weight with respect to 100 parts by weight of the Component (A),

the Component (B) has the following properties:

(α) a surface silanol-group density of not less than 3.0 groups/nm 2 as determined by the Sears titration method,

(β) an average particle size of 2 to 10 μm as determined by the Coulter method, and

(γ) a BET specific surface area of 15 to 29 m 2 /g, and the Component (C) is contained as a vulcanizer.

2. An antivibration rubber composition for automobiles as set forth in claim 1 , wherein the amount of sulfur contained is within a range from 0.3 to 7 parts by weight with respect to 100 parts by weight of the Component (A).

3. An antivibration rubber composition for automobiles as set forth in claim 1 , wherein the surface silanol-group density determined by the Sears titration method (α) is within the range from 3.0 to 30 groups/nm 2 .

4. An antivibration rubber composition for automobiles as set forth in claim 1 , wherein the rubber composition is suitable for engine mounts, stabilizer bushings or suspension bushings respectively for use in vehicles including cars.