Cold Cranking Simulator Viscosity Boosting Base Stocks and Lubricating Oil Formulations Containing the Same
AssigneeExxonMobil Chemical Patents Inc.
InventorKyle G. Lewis
Life of this patent
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Abstract
This disclosure relates to cold cranking simulator viscosity (“CCSV”) boosting base stocks that allow flexibility for engine oil formulations to meet both high and low temperature viscosity requirements while maximizing fuel efficiency. The CCSV-boosting base stocks can include C28-C60 hydrocarbon materials, linear esters, tertiary amides, dialkyl carbonates, aromatic alcohols, and aromatic ethers. This disclosure also relates to lubricating oil formulations containing the CCSV-boosting base stocks, and a method for determining the CCSV-boosting efficacy of a base stock.
Claims25
An oil composition comprising a first base stock and a reference oil different from the first base stock, exhibiting a viscosity measured at 0.1 s−1 shear rate at a temperature T1° C. of v1(T1) Pa·s, a viscosity measured at 0.1 s−1 shear rate at a temperature T2° C. of v1(T2) Pa·s, where −35≤T1≤25, 0<T1−T2≤10, and v1(T2)/v1(T1)≥50.
A lubricating oil base stock having a KV100 in the range from 3.0 to 12.0 cSt, a NV of no higher than 20%, and the following properties:
- when blended with a reference oil which is a Group IV base stock having a KV100 of 4.0 cSt to form a mixture oil comprising the co-base stock at a concentration of 10 wt %, based on the total weight of the mixture oil, the mixture oil exhibits at least one of the following (i) and (ii):
- (i) a viscosity measured at 0.1 s−1 shear rate at a temperature T1° C. of v(T1) Pa·s, a viscosity measured at 0.1 s−1 shear rate at the temperature T2° C. of v(T2) Pa·s, where −35≤T1≤25, 0<T1−T2≤10, v1(T2)/v1(T1)≥50;
- and
- (ii) a peak in the vicinity of the temperature of T1−5° C. on the DSC curve thereof in the temperature range from −60° C. to 25° C. when the mixture oil is being cooled down.
Dependencies are inferred from the claim text.