High viscosity base stock compositions
AssigneeExxonMobil Research and Engineering Company
InventorsSuzzy C. H. Ho, Charles L. Baker, Jr., Shuji Luo, Halou Oumar-Mahamat
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Abstract
Methods are provided for producing Group III base stocks having high viscosity and also having one or more properties indicative of a high quality base stock. The resulting Group III base stocks can have a viscosity at 100° C. and/or a viscosity at 40° C. that is greater than the corresponding viscosity for a conventional Group III base stock. Additionally, the resulting Group III base stocks can have one or more properties that are indicative of a high quality base stock.
Claims10
A base stock composition comprising a Group III base stock having a number average molecular weight (Mn) of 700 g/mol to 2500 g/mol, a weight average molecular weight (Mw) of 1000 g/mol to 4000 g/mol, a polydispersity (Mw/Mn) of 1.3 to 1.6, a sulfur content of 0.03 wt % or less, an aromatics content of 10 wt % or less, a kinematic viscosity at 100° C. of 14 cSt to 35 cSt, a kinematic viscosity at 40° C. of 150 cSt to 400 cSt, and a viscosity index of 120-145.
Dependencies are inferred from the claim text.