| abstract |
The present invention provides a lubricant composition comprising a lubricating oil and, as a multifunctional additive, at least one compound of formula (I)n in which R 1 and R 2 are, independently, hydrogen or C 1 -C 20 alkyl and R 3 is hydrogen, C 1 -C 20 alkyl or a group of the formula R4 CH-CO 2 H wherein R 4 is H or C 1 -C 20 alkyl. Most of the compounds of formula I are new. |