| abstract |
Lubricating oils containing at least one amino phenol of the general formula wherein R is a substantially saturated, hydrocarbon-based group of at least about 10 aliphatic carbon atoms, a, b and c are, for example, each 1, 2 or 3, and Ar is an aromatic moiety such as a benzene nucleus, naphthalene nucleus or linked benzene nuclei, are effective in lubricating twocycle internal combustion engines. Typically such amino phenols for this use are formed by nitration and reduction of alkyl phenols having an alkyl or alkenyl group of at least about 50 carbon atoms. |