RUBBER COMPOSITION AND RUBBER MADE BY USING THE SAME

PROBLEM TO BE SOLVED: To obtain a rubber compsn. which can be efficiently injection molded into a large, thick article without causing scorching by incorporating a natural rubber, a vulcanizer, a vulcanization accelerator, and a particular crosslinking assistant, such as trimethylolpropane trimethacrylate. SOLUTION: To a natural rubber (A), a vulcanizer (B), and a vulcanization accelerator (C) is incorporated trimethylolpropane trimethacrylate, triallyl isocyanurate, or ethylene glycol dimethacrylate as a crosslinking assistant in an amt. of 0.3 to 4 pts.wt. based on 100 pts.wt. component (A). The component (B) is generally a sulfur vulcanizer. The component (C) is a sulfeneamide, thiazole, aldehydeamine or other compd. with a sulfeneamide compd. being preferred. This incorporation permits a large and thick molding to be efficiently produced by injection molding without causing premature vulcanization.