A a curable composition which comprises, as essential components: (A) a vinyl polymer having at least one hydrosilylatable alkenyl group within the molecule, (B) a hydrosilyl group-containing compound, (C) a hydrosilylation catalyst, and (D) an aliphatic unsaturated bond-containing compound, and which may further comprise (E) an amine compound. Moreover, the present invention is constituted of a curable composition which comprises, as essential components, the following three components: (A), (B) and (G) an organic compound having at least one hydrosilylatable alkenyl or alkynyl group within the molecule [other than the above-mentioned component (A)]. Furthermore, a curable composition comprises, as essential components (A), (B), and (H) carbon black. |