| abstract |
Coupled polyamines serving as additives for lubricants, fuels and other functional fluids are prepared by cycloreaction of at least one reactive polyamine with at least one hydrocarbyl polynitrile. This coupled polyamine can also be reacted with a hydrocarbyl carboxylic acid or a derivative thereof, with a phenolic hydrocarbyl reagent or mixtures thereof to obtain an additive with higher oil solubility , with better dispersion and viscosity index. |