| abstract |
Trithiane and phosphorus and/or thiophosphorus acid derivatives are described which are useful as extreme pressure compositions. The composition comprises a lubricating base oil having dissolved therein a reaction product obtained by reacting (A) an aldehyde of structure (a) wherein R is a hydrocarbyl group containing from 1 to about 18 carbon atoms with (B) a phosphorus acid of structure (b) wherein R?2 and R3¿ are each independently a hydrocarbyl group containing from 1 to about 30 carbon atoms, X?1 and X2¿ are each independently oxygen or sulfur and n is independently zero or one. A neutralizing agent, component (C), may be reacted with the phosphorus acid and/or thiophosphorus acid intermediate formed by the reaction of components (A) and (B). |