Patent ID: 7847030

Claim:
A process for making a diphenylamine-functionalized poly-α-olefin, comprising: reacting an amount of a poly-α-olefin having a terminal double bond with a diphenylamine in the presence of a catalyst, wherein the poly-α-olefin has a number average molecular weight of 120 to 600, wherein the ratio of poly-α-olefin having a terminal double bond to diphenylamine is 1.0:1.0 to 10.0:1.0, and wherein the diphenylamine is represented by the following structure: wherein R 1 and R 2 are, independently, selected from the group consisting of a hydrogen, an alkyl group of 1 to 12 carbons, and an aryl group of 1 to 12 carbons, and wherein the reacting step includes oligomerizing the poly-α-olefin followed by alkylating the diphenylamine with the oligomerized poly-α-olefin.