Patent ID: 8263537

Claim:
A lubricating oil composition comprising: (1) a base oil; and (2) a graft polymer dispersant based upon a low MW polyalkene produced by: (a) providing an acylating agent having at least one point of ethylenic unsaturation; (b) providing an amine selected from the group consisting of primary amines and secondary amines; (c) combining the acylating agent and the amine; (d) heating the acylating agent and the amine to form a reaction product comprising a graftable monomer; (e) providing a graftable polyalkene having a number average molecular weight of from about 300 to about 10,000 and an initiator; (f) combining said reaction product with said polyalkene, forming a mixture; (g) combining said initiator with said mixture; and (h) heating said mixture to at least the initiation temperature of said initiator; thereby forming a graft polymer dispersant based upon a low MW polyalkene, without recovering the monomer from the reaction product before carrying out the grafting reaction; wherein the dispersant polyalkene is present in an amount sufficient to improve the dispersancy of the base oil.