FIELD: chemistry.
SUBSTANCE: the invention relates to car tires, to tire belt in particular. The tire belt contains a rubber composition based, at least, on a isoprene elastomer, reinforcing material, suturing system and anti-oxidant. The anti-oxidant contains 4,4'- bis(alkylamino)triphenylamine, corresponding to the formula: 
where R1 and R2 can be identical or different, each of them represents a branched or an unbranched alkyl residue comprising from 1 to 12 carbon atoms, or a cycloalkyl group comprising from 5 to 8 carbon atoms.
EFFECT: increases fatigue resistance and prevents crack formation in the tire belt.
15 cl, 2 dwg, 2 tbl, 2 ex
