Lubricant composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsHiroyuki TATSUMI, Kazushige MATSUBARA
Life of this patent
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Abstract
A lubricating oil composition may contain a base oil (A), a phosphorous acid ester (B) having at least one sulfur atom-containing group having 2 to 20 carbon atoms, the sulfur atom-containing group having at least one —(S)x— group (x is an integer of 1 or more) between two adjacent carbon atoms in a structure of an alkyl group, a thiadiazole-based compound (C), and a benzotriazole-based compound (D). A content of the component (C) may be 0.01 mass % or more and less than 0.60 mass %, based on the total mass of the lubricating oil composition. A content of the component (D) is 0.02 mass % or more and less than 0.20 mass %, based on the total mass of the lubricating oil composition.
Claims12
A lubricating oil composition, comprising:
- (A) a base oil;
- (B) a phosphorous acid ester comprising a sulfur atom-comprising group comprising (i) 2 to 20 carbon atoms and (ii) a —(S)x— group with x being an integer of 1 or more between two adjacent carbon atoms in a structure of an alkyl group;
- (C) a thiadiazole-based compound;
- and
- (D) a benzotriazole-based compound,
- wherein the thiadiazole-based compound (C) is present in a range of from 0.01 to less than 0.60 mass %, based on total lubricating oil composition mass, and
- wherein the benzotriazole-based compound (D) is present in a range of from 0.02 to less than 0.20 mass %, based on the total lubricating oil composition mass.
Dependencies are inferred from the claim text.