fluence of rubber composition on migration of N-phenyl-N＇-isopropyl-p-phenylenediamine (IPPD), and N-phenyl-N＇-(1,3-dimethylbutyl)-p-phenylenediamine (HPPD) to the surface in binary rubber-based vulcanizates of natural rubber (NR), styrene-butadiene rubber (SBR), and butadiene rubber (BR) was studied. Migration experiments were performed at 60 and 80 degrees C for 21 days and outdoors for 4 months. Migration rates of IPPD and HPPD in the vulcanizates of SBR/NR and BR/NR blends outdoors increased by decreasing the content of NR, and those in the vulcanizates of BR/SBR blends decreased with an increase of the content of BR. Migration behaviors of the antiozonants in the vulcanizates of SBR/NR and BR/NR blends at 60 and 80 degrees C, on the whole, showed trends similar to the outdoor results. Migration rates of the antiozonants in the vulcanizates of BR/SBR blends at 60 and 80 degrees C showed some differences. Variation of migration behaviors of the antiozonants in the binary rubber-based vulcanizates depending on rubber composition was explained by the interface between dissimilar rubbers and the intermolecular interactions between the matrices and the antiozonants.