Engine oils for soot handling and friction reduction
AssigneeAfton Chemical Corporation
InventorJohn Loper
Life of this patent
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Abstract
Engine oil \s and methods for use in soot-producing engines. The engine oil contains a major amount of a base oil and a dispersant reaction product of A) a hydrocarbyl-dicarboxylic acid or anhydride, and B) at least one polyamine, that is post-treated with C) an aromatic carboxylic acid, an aromatic polycarboxylic acid, or an aromatic anhydride, wherein all carboxylic acid or anhydride groups of C) are attached directly to an aromatic ring. A molar ratio of carboxyl groups from components A) and C) to nitrogen atoms from component B) of from 0.9 to 1.3 is used to make the dispersant which also has a molar ratio of component C) to component B) of at least 0.4 and when component B) has an average of 4-6 nitrogen atoms per molecule, a molar ratio of A) to B) is from 1.0 to 1.6.
Claims12
An engine oil composition comprising:
- greater than 50% to about 99% by weight of a base oil, based on the total weight of the engine oil composition, and a dispersant that is a reaction product of A) a polyisobutenyl succinic acid or anhydride, and B) at least one polyamine, that is post-treated with C) an aromatic carboxylic acid, an aromatic polycarboxylic acid, or an aromatic anhydride, wherein all carboxylic acid or anhydride groups of C) are attached directly to an aromatic ring, and
- wherein a molar ratio of carboxyl groups from components A) and C) to nitrogen atoms from component B) of from 1.0 to 1.2 is used to make the dispersant, the dispersant has a molar ratio of component C) to component B) of 1.0 to 1.6, component B) has an average of 4-5 nitrogen atoms per molecule, and a molar ratio of A) to B) is from 1.2 to 1.4;
- and
- the engine oil composition comprises 2 wt. % to 5.5 wt. % of the dispersant, based on a total weight of the engine oil composition.
A method for maintaining the soot or sludge handling capability of an engine oil composition comprising a step of adding to the engine oil composition a dispersant that is a reaction product of A) a polyisobutenyl succinic acid or anhydride, and B) at least one polyamine, that is post-treated with C) an aromatic carboxylic aci, an aromatic polycarboxylic acid, or an aromatic anhydride, wherein all carboxylic acid or anhydride groups of C) are attached directly to an aromatic ring, and
- wherein a molar ratio of carboxyl groups from components A) and C) to nitrogen atoms from component B) of from 1.0 to 1.2 is used to make the dispersant, and the dispersant has a molar ratio of component C) to component B) of 1.0 to 1.6, component B) has an average of 4-5 nitrogen atoms per molecule, and a molar ratio of A) to B) is from 1.2 to 1.4;
- and
- the engine oil composition comprises 2 wt. % to 5.5 wt. % of the dispersant, based on a total weight of the engine oil composition.
Dependencies are inferred from the claim text.