Patent ID: 7300910
Filing Date: 2007-11-27
Classification: C07C,C07D,C10M

Abstract:
1. A lubricating oil composition comprising a major amount of an oil of lubricating viscosity; a minor amount of a high molecular weight, nitrogen-containing dispersant; and a minor amount of an oligomer of the formula: wherein each Ar independently represents an aromatic moiety selected from polynuclear heterocyclic moieties, said aromatic moiety being optionally substituted by 1 to 6 substituents selected from H, —OR 1 , —N(R 1 ) 2 , F, Cl, Br, I, -(L-(Ar)-T), —S(O) W R 1 , —(CZ) x -(Z) y -R 1 and -(Z) y -(CZ) x -R 1 , wherein w is 0 to 3, each Z is independently O, —N(R 1 ) 2 or S, x and y are independently 0 or 1 and each R 1 is independently H or a linear or branched, saturated or unsaturated hydrocarbyl group having from 1 to about 200 carbon atoms, optionally mono- or poly-substituted with one or more groups selected from —OR 2 , —N(R 2 ) 2 , F, Cl, Br, I, —S(O) w R 2 , —(CZ) x -(Z) y -R 2 and -(Z) y -(CZ) x -R 2 , wherein w, x, y and Z are as defined above and R 2 is a hydrocarbyl group having 1 to about 200 carbon atoms; each L is independently a carbon-carbon single bond or a linking group; each T is independently H, OR n is 2 to about 1000; wherein at least 25% of aromatic moieties (Ar) are connected to at least 2 linking moieties (L) and a ratio of the total number of aliphatic carbon atoms in the oligomer to the total number of aromatic ring atoms in aromatic moieties (Ar) is from about 0.10:1 to about 40:1.