Soot dispersants and lubricating oil compositions containing same

The reaction product of an acylating agent and a compound of the formula:

• wherein:
• each Ar independently represents a polycyclic carbocyclic aromatic moiety having 0 to 3 substituents selected from the group consisting of alkyl, alkoxy, alkoxyalkyl, hydroxy, hydroxyalkyl, halo and combinations thereof;
• each L is independently a linking moiety comprising a linking group;
• each Y is independently a moiety of the formula H(O(CR2)n)yX—, wherein X is selected from the group consisting of (CR′2)z, O and S;
• R and R′ are each independently selected from H, C1 to C6 alkyl and aryl;
• z is 1 to 10;
• n is 0 to 10 when X is (CR′2)z, and 2 to 10 when X is O or S;
• and y is 1 to 30;
• each a is independently 0 to 3, with the proviso that at least one Ar moiety bears at least one group Y;
• and m is 1 to 100.

A compound of the formula:

• wherein:
• each Ar independently represents a polycyclic carbocyclic aromatic moiety having 0 to 3 substituents selected from the group consisting of alkyl, alkoxy, alkoxyalkyl, hydroxy, hydroxyalkyl, acyloxy, acyloxyalkyl, aryloxy, aryloxy alkyl, halo and combinations thereof;
• each L is independently a linking moiety comprising a carbon-carbon single bond or a linking group;
• each Y is independently a moiety of the formula Z(O(CR2)n)yX—, wherein X is selected from the group consisting of(CR′2)z, O and S;
• R and R′ are each independently selected from H, C1 to C6 alkyl and aryl;
• z is 1 to 10;
• n is 1 to 10 when X is (CR′2)z, and 2 to 10 when X is O or S;
• y is 1 to 30;
• Z is H, an acyl group, an alkyl group or an aryl group;
• each a is independently 0 to 3, with the proviso that at least one Ar moiety bears at least one group Y in which Z is not H;
• and m is 1 to 100.