Asphaltene dispersant containing lubricating compositions

摘要

The present invention relates to a lubricating composition, particularly marine diesel engine lubricating compositions, comprising: (a) an oil of lubricating viscosity; (b) an asphaltene dispersant comprising an amide group, which may also contain a succinimide group, and which may optionally be used in combination with additional asphaltene dispersants that contain a cyclic headgroup that contains a nitrogen atoms where the additional asphaltene dispersants may also include a succinimide group; and (c) a detergent derived from an alkyl phenol. The invention further provides methods of using such compositions in the operation of engine, particularly marine diesel engines.

主权项

1. A lubricating composition comprising:
(a) an oil of lubricating viscosity; (b) an asphaltene dispersant comprising an amide group; and (c) a detergent derived from an alkyl phenol;wherein the asphaltene dispersant comprises:
(i) a compound represented by formula (I);wherein each R1 is independently a hydrogen or a hydrocarbyl group containing 1 to 250 carbon atoms, so long as at least one R1 is a hydrocarbyl group; each R2 is independently a hydrogen or a hydrocarbyl group containing 1 to 10 carbon atoms; each R3 is independently a hydrocarbylene group containing from 1 to 10 carbon atoms; each R4 is independently a hydrocarbyl group containing from 1 to 50 carbon atoms; x is an integer from 0 to 6; y is an integer from 1 to 4; and z is an integer from 0 to 6.