Patent ID: 7323520

Claim:
A method for reducing the aging characteristics of a rubber vulcanizate comprising admixing an anti-aging agent having the formula (I) wherein R 1 represents hydrogen, straight-chain or branched C 1 -C 12 -alkyl, C 1 -C 12 -alkoxy-, C 1 -C 12 -alkylthio-, C 1 -C 12 -alkylamino, di-(C 1 -C 12 -alkyl)-amino-, C 6 -C 14 -aryl-, C 6 -C 14 -aryloxy-, C 6 -C 14 -arylthio-, C 6 -C 14 -arylamino, C 2 -C 12 -heteroaryl-, C 2 -C 12 -heteroaryloxy-, C 2 -C 12 -heteroarylthio-, C 2 -C 12 -heteroarylamino, R 2 and R 3 are the same or different and represent straight-chain or branched C 1 -C 12 -alkyl, C 1 -C 12 -alkoxy-, C 1 -C 12 -alkylthio-, C 1 -C 12 -alkyl-amino, di-(C 1 -C 12 -alkyl)-amino-, benzyl-, 1,1-dimethylbenzyl- or phenyl-, or together form a 5-10-link aliphatic or aromatic, mono- or polynuclear ring system, which may optionally be interrupted once or more than once by heteroatoms selected from the group consisting of N, O and S, R 4 to R 7 are the same or different and represent hydrogen, straight-chain or branched C 1 -C 12 -alkyl-, C 5 -C 12 -cycloalkyl- or C 6 -C 14 -aryl-, mono- or polyunsaturated, olefinic or acetylenic, straight-chain or branched C 2 -C 12 -alkenyl-, C 1 -C 12 -alkinyl- or C 5 -C 8 -cycloakenyl, or together form a 5-8-link, aliphatic ring system, which may optionally be interrupted once or more than once by heteroatoms selected from the group consisting of N, O and S, with at least one rubber monomer and a vulcanizing agent.