Engine oil composition

Patent metadata

Field	Value
Publication number	US-12104137-B2
Application number	US-202118040165-A
Country	US
Kind code	B2
Filing date	Sep 1, 2021
Priority date	Sep 1, 2020
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

The present invention provides an engine oil composition including 70 to 95 percent by weight of a base oil and 0.01 to 15 percent by weight of a dispersant comb polymer, based on the overall weight of the engine oil composition. The dispersant comb polymer consists of 13.7% by weight of a macromonomer, which is an ester of methacrylic acid and a hydroxylated hydrogenated polybutadiene with Mn of 4750 g/mol; 51.5% by weight of n-butyl methacrylate; 17.3% by weight of LMA; 11.2% by weight of styrene; 0.2% by weight of methyl methacrylate; and 6.10% by weight of N,N-dimethylaminoethyl methacrylate. The modified dispersant inhibitor package contains 30 wt % or less of succinimide type dispersant based on the overall weight of the modified dispersant inhibitor additive package, and the engine oil composition has an SAE viscosity grade of 0W-X, wherein X is 30 or less.

First claim

We claim:

1. An engine oil composition comprising:
i) in the range of 70 to 95 percent by weight of a base oil, based on the overall weight of the engine oil composition;
ii) in the range of 0.01 to 15 percent by weight of a dispersant comb polymer, based on the overall weight of the engine oil composition;
iii) in the range of from 4.99 to 15 percent by weight of a modified dispersant inhibitor additive package based on the overall weight of the engine oil composition, wherein the dispersant comb polymer consists of
a. 13.7% by weight of a macromonomer, which is an ester of methacrylic acid and a hydroxylated hydrogenated polybutadiene with Mn of 4750 g/mol;
b. 51.5% by weight of n-butyl methacrylate;
c. 17.3% by weight of LMA;
d. 11.2% by weight of styrene;
e. 0.2% by weight of methyl methacrylate; and
f. 6.1% by weight of N,N-dimethylaminoethyl methacrylate;

wherein the modified dispersant inhibitor package contains 30 wt % or less of succinimide dispersant based on the overall weight of the modified dispersant inhibitor additive package, and
wherein the engine oil composition has an SAE viscosity grade of 0W-X, wherein X is 30 or less.

2. The engine oil composition according to claim 1 , wherein the base oil is a Fischer-Tropsch derived base oil.

3. The engine oil composition according to claim 1 , wherein the succinimide dispersant is present in the modified dispersant inhibitor package at an amount that is at least 50% less than that which would have been present if a viscosity modifier that was not a dispersant comb polymer consisting of 13.7% by weight of a macromonomer, which is an ester of methacrylic acid and a hydroxylated hydrogenated polybutadiene with Mn of 4750 g/mol); 51.5% by weight of n-butyl methacrylate; 17.3% by weight of LMA; 11.2% by weight of styrene; 0.2% by weight of methyl methacrylate;
and 6.1% by weight of N,N-dimethylaminoethyl methacrylate, was used.

4. The engine oil composition according to claim 1 , wherein the succinimide dispersant is present in an amount in the range of from 0.01 to 3.5 wt % of the engine oil composition.

5. The engine oil composition according to claim 1 , wherein the succinimide dispersant is a polyolefin substituted succinimide dispersant.

Assignees

• Shell Oil Co
• Shell Usa Inc

Inventors

• Desai Priyanka Subhash
• Southby Mark Clift

Classifications

• C10N2040/25

  Internal-combustion engines · CPC title

• C10N2030/40

  Low content or no content compositions · CPC title

• C10N2020/071

  Branched chain compounds · CPC title

• C10N2030/54

  Fuel economy · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title