| 摘要 |
A method of lubricating mechanical parts in the presence of at least one fluoroelastomer surface. The lubrication is effected by means of a lubricating oil containing a dispersant prepared by (i) reacting at least one polyamine with at least one acyclic hydrocarbyl substituted succinic acylating agent in which such acyclic hydrocarbyl substituent contains an average of at least 40 carbon atoms, such reaction being conducted using proportions such that the acylating agent is reacted with the polyamine in a mole ratio of from 1.05 to 2.85 moles per mole of polyamine, and (ii) reacting the product so formed with (a) at least one aliphatic vicinal dicarboxylic acid acylating agent containing 4 to 30 carbon atoms in the molecule and in which the two carboxyl groups are separated from each other by two aliphatic carbon atoms, or (b) an anhydride, acid halide, or ester of at least one such dicarboxylic acid acylating agent, or (c) a combination of (a) and (b), using in the reaction of (ii) proportions such that the mole ratio of such acylating agent is from 0.10 to 2.50 moles per mole of said polyamine with the proviso that the total mole ratio of the acylating agents in (i) and (ii) per mole of said polyamine is in the range of 2.40 to 4.50. |
