| abstract |
A rubber composition comprising 100 parts by weight ofna rubber component which comprises at least one type ofnrubber selected from the group consisting of natural rubbernand diene synthetic rubbers, 0.1 to 10 parts by weight ofnat least one type of metal dithiophosphate represented bynthe following general formula, optionally 15 to 85 parts bynweight of a reinforcing inorganic filler, and optionally anspecific tertiary amine compound in an amount of 0.5 to 15%nby weight of the amount of the reinforcing inorganic fillernis provided.n n wherein R 1 and R 3 each independently represents an alkylngroup or a cycloalkyl group, M represents an antimony atom,na zinc atom, a copper atom, or an iron atom, and nnrepresents a valency of M. n The rubber composition of the present inventionnexhibits excellent resistance to heat or resistance to heatnaging (particularly excellent resistance to hardening andnexcellent fracture properties). |