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
Estimating the term…
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.
Claims24
An oil composition comprising a first base stock and a reference oil different from the first base stock, wherein the reference oil is the remainder of the oil composition absent the first base stock;
- wherein the first base stock is selected from one or more of:
- a C28-C40 mono-methyl paraffin,
- a linear mono-ester having the following formula R1—C(O)—O—R2, where R1 and R2 are independently each a linear, non-branched hydrocarbyl group, R1 comprises from 15-17 carbon atoms and R2 comprises from 10-12 carbon atoms, and
- the oil composition 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;
- and
- further exhibiting a peak in the vicinity of the temperature T1−5° C. on the DSC curve thereof in the temperature range from −60° C. to 25° C. when the oil composition is being cooled down.
A mixture oil comprising a lubricating oil base stock and a reference oil, wherein the reference oil is the remainder of the mixture oil absent the lubricating oil base stock;
- wherein the lubricating oil base stock is selected from one or more of:
- a C28-C40 mono-methyl paraffin;
- and
- a linear mono-ester having the following formula R1—C(O)—O—R2, where R1 and R2 are independently each a linear, non-branched hydrocarbyl group, R1 comprises from 15-17 carbon atoms and R2 comprises from 10-12 carbon atoms, and
- the lubricating oil base stock has a KV100 in the range from 3.0 to 12.0 cSt, a Noack volatility as determined by ASTM D5800 of no higher than 20%, and when blended with the reference oil which is a Group IV base stock having a KV100 of 4.0 cSt to form the mixture oil comprising the lubricating oil 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.
A mixture oil comprising a lubricating oil base stock and a reference oil, wherein the reference oil is the remainder of the mixture oil absent the lubricating oil base stock;
- wherein the lubricating oil base stock is selected from one or more of:
- a C28-C40 mono-methyl paraffin;
- and
- a linear mono-ester having the following formula R1—C(O)—O—R2, where R1 and R2 are independently each a linear, non-branched hydrocarbyl group, R1 comprises from 15-17 carbon atoms and R2 comprises from 10-12 carbon atoms, and
- the lubricating oil base stock has a KV100 in the range from 3.0 to 12.0 cSt, a Noack volatility as determined by ASTM D5800 of no higher than 20;
- when blended with the reference oil which is a Group IV base stock having a KV100 of 4.0 cSt to form the mixture oil comprising the lubricating oil 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.