| abstract |
A condensation product of N, N-di (hydrocarbyl) alkylenediamine with a hydroxy-polycarboxylic acid such as 2,3-dihydroxybutanedic acid or 2-hydroxybutanedioic acid, Wherein the group contains from 1 to 22 carbon atoms, the total number of carbon atoms present in the two hydrocarbyl groups is at least about 9, and the alkylene group contains from 2 to 4 carbon atoms, is used as a friction modifier in an automatic transmission Lt; / RTI > |