CHEMICALS AND CHEMICAL COMPOSITIONS FOR THE PROCESSING AND MANUFACTURE OF NATURAL AND SYNTHETIC RUBBER AND OF RUBBER RECLAIMS OF NATURAL AND SYNTHETIC RUBBER-NAMELY, VULCANIZING AGENTS, ACCELERATORS, ANTIOXYDANTS, ANTIOZONANTS, DISPERSING AGENTS, RUBBER EXTENDERS, SOFTENERS, STIFFENERS, TACKIFIERS, EXTRUDING AGENTS, AND PLASTICIZERS