| abstract |
(57) [Summary] [Purpose] By compounding a specific compound into rubber, Improves adhesion and rubber hardness in vulcanization adhesion with a reinforcing material. [Structure] 0.5 to 10 parts by weight of (B) N, N'-m-phenylene bismaleimide per 100 parts by weight of the rubber component (A) such as natural rubber, and (C) divalent or higher carboxylic acid or its anhydride 0.3 to 3 parts by weight of the product, and (D) 0.3 to 10 parts by weight of a compound which generates formaldehyde by heating are compounded. [Effect] Adhesiveness with the reinforcing material is improved, and a rubber having a high hardness can be obtained. |