| abstract |
(57) [Summary] [Problem] To have a high vibration suppression function in a wide temperature range, Provided is a rubber composition for a vibration damping adhesive having excellent adhesiveness to an oil surface, and excellent in hot water adhesiveness and heat resistant adhesiveness. SOLUTION: (A) A liquid isoprene rubber and (B) a peroxide are used in an amount of 1.3 to 1.8 per 1 mol of the liquid isoprene rubber. Mole and (C) the adhesion-imparting compound and / or the adhesion-imparting compound per 100 parts by weight of the liquid isoprene rubber. A rubber composition containing from 20 parts by weight to 20 parts by weight, Physical properties of a cured product of the composition are as follows: G ≦ 1 MPa, tan δ ≧ 0.3, and the following relational expression (1): log (tan δ) ≧ (0.24) log G− at a temperature of −20 to 80 ° C. 0.67 (1) (wherein tan δ is the viscoelastic modulus of the cured product, and G is the elastic modulus of the cured product), and has high vibration damping performance, characterized by having a high vibration damping performance. |