Method for improving deposit control and cleanliness performance in an engine lubricated with a lubricating oil
Abstract
A method for improving deposit control and cleanliness performance in an engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil. The formulated oil comprises a lubricating oil base stock as a major component, and a mixture of (i) at least one dispersant, and (ii) at least one viscosity modifier, as minor components. The at least one dispersant and the at least one viscosity modifier are present in an amount sufficient to have a critical dispersant thickening ratio of greater than 0.33. The critical dispersant thickening ratio is determined in accordance with the formula: Σ [ G n ] * dV / d [ G n ] Σ [ B m ] * dV / d [ B m ] wherein [G n ] is the weight percent of each of n dispersants in the formulated oil, [B m ] is the weight percent of each of m viscosity modifiers in the formulated oil, dV/d[G n ] is the kinematic viscosity (Kv 100 ) increase of the lubricating oil per the weight percent of each of n dispersants in the formulated oil, and dV/d[B m ] is the kinematic viscosity (Kv 100 ) increase of the lubricating oil per the weight percent of each of m viscosity modifiers in the formulated oil.
Claims
exact text as granted — not AI-modified1 . A method for improving deposit control and cleanliness performance in an engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil comprising a lubricating oil base stock as a major component; and a mixture of (i) at least one dispersant, and (ii) at least one viscosity modifier, as minor components; wherein the at least one dispersant and the at least one viscosity modifier are present in an amount sufficient to have a critical dispersant thickening ratio of greater than 0.33; wherein the critical dispersant thickening ratio is determined in accordance with the formula:
Σ
[
G
n
]
*
dV
/
d
[
G
n
]
Σ
[
B
m
]
*
dV
/
d
[
B
m
]
wherein [G n ] is the weight percent of each of n dispersants in the formulated oil, [B m ] is the weight percent of each of m viscosity modifiers in the formulated oil, dV/d[G n ] is the kinematic viscosity (Kv 100 ) increase of the lubricating oil as determined by ASTM D445 per the weight percent of each of n dispersants in the formulated oil, and dV/d[B m ] is the kinematic viscosity (Kv 100 ) increase of the lubricating oil as determined by ASTM D445 per the weight percent of each of m viscosity modifiers in the formulated oil.
2 . The method of claim 1 wherein the amount of the at least one dispersant and the at least one viscosity modifier is sufficient to provide a critical dispersant thickening ratio of greater than 0.33 in a direct injection, ring sticking (rings 1 and 2 ), and piston cleanliness test using a Volkswagen TDI2 test engine, in accordance with CEC L78-T-99 test procedure.
3 . The method of claim 1 wherein the critical dispersant thickening ratio is greater than 0.47.
4 . The method of claim 1 wherein the critical dispersant thickening ratio is greater than 0.75.
5 . The method of claim 1 wherein the critical dispersant thickening ratio is greater than 1.0.
6 . The method of claim 1 wherein the lubricating oil base stock comprises a Group I base stock, a Group II base stock, a Group III base stock, a Group IV base stock, a Group V base stock, or mixtures thereof.
7 . The method of claim 1 wherein the at least one dispersant is an ashless dispersant.
8 . The method of claim 1 wherein the at least one dispersant is selected from the group consisting of hydrocarbyl-substituted succinic acid derivatives, hydrocarbyl-substituted succinic anhydride derivatives, succinimides, succinate esters, succinate ester amides, Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine, hydrocarbyl-substituted amines, and polymethacrylate or polyacrylate derivatives.
9 . The method of claim 1 wherein the at least one viscosity modifier is selected from the group consisting of linear or star-shaped polymers and copolymers of methacrylate, butadiene, olefins, or alkylated styrenes.
10 . The method of claim 1 wherein the lubricating oil further comprises one or more of an antioxidant, detergent, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive.
11 . The method of claim 1 wherein the lubricating oil base stock is present in an amount from 78 weight percent to 98 weight percent, the dispersant is present in an amount from 0.5 weight percent to 12 weight percent, and the viscosity modifier is present in an amount from 0.5 weight percent to 10 weight percent, based on the total weight of the lubricating oil.
12 . The method of claim 1 wherein the lubricating oil is a passenger vehicle engine oil (PVEO) or a commercial vehicle engine oil (CVEO).
13 . A lubricating oil comprising a lubricating oil base stock as a major component; and a mixture of (i) at least one dispersant, and (ii) at least one viscosity modifier, as minor components; wherein the at least one dispersant and the at least one viscosity modifier are present in an amount sufficient to have a critical dispersant thickening ratio of greater than 0.33; wherein the critical dispersant thickening ratio is determined in accordance with the formula:
Σ
[
G
n
]
*
dV
/
d
[
G
n
]
Σ
[
B
m
]
*
dV
/
d
[
B
m
]
wherein [G n ] is the weight percent of each of n dispersants in the formulated oil, [B m ] is the weight percent of each of m viscosity modifiers in the formulated oil, dV/d[G n ] is the kinematic viscosity (Kv 100 ) increase of the lubricating oil as determined by ASTM D445 per the weight percent of each of n dispersants in the formulated oil, and dV/d[B m ] is the kinematic viscosity (Kv 100 ) increase of the lubricating oil as determined by ASTM D445 per the weight percent of each of m viscosity modifiers in the formulated oil.
14 . The lubricating oil of claim 13 wherein the amount of the at least one dispersant and the at least one viscosity modifier is sufficient to provide a critical dispersant thickening ratio of greater than 0.33 in a direct injection, ring sticking (rings 1 and 2 ), and piston cleanliness test using a Volkswagen TDI2 test engine, in accordance with CEC L78-T-99 test procedure.
15 . The lubricating oil of claim 13 wherein the critical dispersant thickening ratio is greater than 0.47.
16 . The lubricating oil of claim 13 wherein the critical dispersant thickening ratio is greater than 0.75.
17 . The lubricating oil of claim 13 wherein the critical dispersant thickening ratio is greater than 1.0.
18 . The lubricating oil of claim 13 wherein the lubricating oil base stock comprises a Group I base stock, a Group II base stock, a Group III base stock, a Group IV base stock, a Group V base stock, or mixtures thereof.
19 . The lubricating oil of claim 13 wherein the at least one dispersant is an ashless dispersant.
20 . The lubricating oil of claim 13 wherein the at least one dispersant is selected from the group consisting of hydrocarbyl-substituted succinic acid derivatives, hydrocarbyl-substituted succinic anhydride derivatives, succinimides, succinate esters, succinate ester amides, Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine, hydrocarbyl-substituted amines, and polymethacrylate or polyacrylate derivatives.
21 . The lubricating oil of claim 13 wherein the at least one viscosity modifier is selected from the group consisting of linear or star-shaped polymers and copolymers of methacrylate, butadiene, olefins, or alkylated styrenes.
22 . The lubricating oil of claim 13 wherein the lubricating oil further comprises one or more of an antioxidant, detergent, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive.
23 . The lubricating oil of claim 13 wherein the lubricating oil base stock is present in an amount from 78 weight percent to 98 weight percent, the dispersant is present in an amount from 0.5 weight percent to 12 weight percent, and the viscosity modifier is present in an amount from 0.5 weight percent to 10 weight percent, based on the total weight of the lubricating oil.
24 . The lubricating oil of claim 13 wherein the lubricating oil is a passenger vehicle engine oil (PVEO) or a commercial vehicle engine oil (CVEO).
25 . A method for tuning deposit control and cleanliness performance in an engine lubricated with a lubricating oil, said method comprising:
using as the lubricating oil a formulated oil, said formulated oil comprising a lubricating oil base stock as a major component; and a mixture of (i) at least one dispersant, and (ii) at least one viscosity modifier, as minor components; and adjusting the amount of the at least one dispersant and the at least one viscosity modifier sufficient to provide a determined critical dispersant thickening ratio; wherein the critical dispersant thickening ratio is determined in accordance with the formula:
Σ
[
G
n
]
*
dV
/
d
[
G
n
]
Σ
[
B
m
]
*
dV
/
d
[
B
m
]
wherein [G n ] is the weight percent of each of n dispersants in the formulated oil, [B m ] is the weight percent of each of m viscosity modifiers in the formulated oil, dV/d[G n ] is the kinematic viscosity (Kv 100 ) increase of the lubricating oil as determined by ASTM D445 per the weight percent of each of n dispersants in the formulated oil, and dV/d[B m ] is the kinematic viscosity (Kv 100 ) increase of the lubricating oil as determined by ASTM D445 per the weight percent of each of m viscosity modifiers in the formulated oil.
26 . The method of claim 25 wherein the amount of the at least one dispersant and the at least one viscosity modifier is adjusted so as to tune the critical dispersant thickening ratio from a value less than 0.33 to a value greater than 0.33.
27 . The method of claim 25 wherein the amount of the at least one dispersant and the at least one viscosity modifier is sufficient to provide a critical dispersant thickening ratio of greater than 0.33 in a direct injection, ring sticking (rings 1 and 2 ), and piston cleanliness test using a Volkswagen TDI2 test engine, in accordance with CEC L78-T-99 test procedure.
28 . The method of claim 25 wherein the critical dispersant thickening ratio is greater than 0.47.
29 . The method of claim 25 wherein the critical dispersant thickening ratio is greater than 0.75.
30 . The method of claim 25 wherein the critical dispersant thickening ratio is greater than 1.0.
31 . The method of claim 25 wherein the lubricating oil base stock comprises a Group I base stock, a Group II base stock, a Group III base stock, a Group IV base stock, a Group V base stock, or mixtures thereof.
32 . The method of claim 25 wherein the at least one dispersant is an ashless dispersant.
33 . The method of claim 25 wherein the at least one dispersant is selected from the group consisting of hydrocarbyl-substituted succinic acid derivatives, hydrocarbyl-substituted succinic anhydride derivatives, succinimides, succinate esters, succinate ester amides, Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine, hydrocarbyl-substituted amines, and polymethacrylate or polyacrylate derivatives.
34 . The method of claim 25 wherein the at least one viscosity modifier is selected from the group consisting of linear or star-shaped polymers and copolymers of methacrylate, butadiene, olefins, or alkylated styrenes.
35 . The method of claim 25 wherein the lubricating oil further comprises one or more of an antioxidant, detergent, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive.
36 . The method of claim 25 wherein the lubricating oil base stock is present in an amount from 78 weight percent to 98 weight percent, the dispersant is present in an amount from 0.5 weight percent to 12 weight percent, and the viscosity modifier is present in an amount from 0.5 weight percent to 10 weight percent, based on the total weight of the lubricating oil.
37 . The method of claim 25 wherein the lubricating oil is a passenger vehicle engine oil (PVEO) or a commercial vehicle engine oil (CVEO).
38 . The lubricating oil of claim 13 having a sulfated ash content of less than or equal to 1% by mass.Join the waitlist — get patent alerts
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