Patent ID: 7413580

Claim:
A compound chosen from para-phenylenediamines of formula (I) and corresponding addition salts: wherein: R is chosen from linear or branched C 1 -C 10 alkylene radicals substituted with at least one radical chosen from: carboxyl radicals, aminocarbonyl radicals, (C 1 -C 6 )monoalkyl amino carbonyl radicals, (C 1 -C 6 )dialkyl aminocarbonyl radicals, and (C 1 -C 16 )alkoxycarbonyl radicals, R 1 and R 2 which may be identical or different, are chosen from hydrogen, linear or branched C 1 -C 6 alkyl radicals, and linear or branched C 1 -C 6 alkyl radicals substituted with at least one radical chosen from hydroxyl, C 1 -C 4 alkoxy, amino, (C 1 -C 4 ) monoalkylamino, and (C 1 -C 4 )dialkylamino radicals, R′ and R″, which may be identical or different, are chosen from C 1 -C 6 alkyl radicals, C 1 -C 6 alkoxy radicals, hydroxy(C 1 -C 6 )alkoxy radicals, (C 1 -C 6 )alkoxy(C 1 -C 6 )alkyl radicals, monohydroxy(C 1 -C 6 )alkyl radicals, and polyhydroxy(C 1 -C 6 )alkyl radicals, and n and m, which may be identical or different, are each integers ranging from 0 to 4, with the proviso that the compound is not a compound of formula (a):