Patent ID: 8530397

Claim:
A composition in the form of a lubricating oil composition, grease, fuel, or functional fluid subject to oxidative degradation, containing, in the form of a Michael adduct, a phenylenediamine additive of the general formula (I) R 1 R 2 N—Ar—NR 3 CHR 4 CHR 5 COR 6 (I) wherein: R 1 , R 2 and R 3 are independently hydrogen atoms, linear or branched alkyl or alkoxyakyl groups, cycloalkyl rings, or aryl groups, or structure (II) below; Ar is an aryl group; R 4 and R 5 are independently hydrogen atoms, or alkyl, alkoxyalkyl or aryl groups; R 6 is an alkoxyalkyl group connected to the carbon atom of the carbonyl group in the above general formula (I) via an oxygen atom; structure (II) is represented by the formula —CHR 7 CHR 8 COR 9 (II) wherein R 7 and R 8 are independently hydrogen atoms, or alkyl, alkoxyalkyl or aryl groups; and R 9 is an alkoxyalkyl group and is connected to the carbon atom of the carbonyl group in structure (II) via an oxygen atom; the alkyl groups referred to above having from 1 to 36 carbon atoms, and the phenylenediamine being in the form of a free base or as an oil-soluble salt thereof.