| 摘要 |
An object of the present invention is to provide a rubber-steel hybrid cord which makes it possible to sufficiently reduce the proportion of an adhesion promoter or sulfur while maintaining good adhesiveness, and to provide a pneumatic radial tire using the same as a reinforcement layer. To achieve this object, a rubber-steel hybrid cord of the present invention is characteristically formed by twisting a plurality of sheath filaments or sheath strands around a core in which a periphery of and space surrounded by one or a plurality of core filaments or a core strand are coated or filled with a filler rubber (A) containing an adhesion promoter, thereby forming a multilayer-twist steel cord or a multi-twist steel cord, and coating an outer surface of the multilayer-twist steel cord or the multi-twist steel cord with a coating rubber (C). Further, an amount of an adhesion promoter contained in the coating rubber (C) is equal to or more than an amount of the adhesion promoter contained in the filler rubber (A). |
