| abstract |
The invention relates to friction-modifying additives useful in compositions for gearboxes, in particular liquids of automatic gearboxes. The additive comprises a component 1 formed alone by condensation of a polyamine such as a tetraethylen pentamine with an aliphatic monoacid such as an isostearic acid, or a mixture, and / or a salt, of component-1 and of a component 2, component 2 being an acid ester formed by the reaction of a heterodialcanol such as thiobisethanol and a hydrocarbyl substituted dicarboxylic acid or anhydride, such as an octadecenyl succinic anhydride. |