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US 12,291,687 B2Granted
Lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorYasunori Shimizu
Life of this patent
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Abstract
A lubricating oil composition, containing a base oil (A), an aromatic carboxylic acid ester having one or more hydroxyl groups (B), and a sulfur-based antioxidant (C). A content of phosphorus atoms is 0.06% by mass or less, based on a total amount of the lubricating oil composition, and a sulfated ash content is 0.6% by mass or less, based on the total amount of the lubricating oil composition.
Claims20
A lubricating oil composition, comprising:
- a base oil;
- an aromatic carboxylic acid ester having one or more hydroxyl groups;
- and
- a sulfur-based antioxidant,
- wherein a content of phosphorus atoms is 0.06% by mass or less, based on a total amount of the lubricating oil composition, a sulfated ash content is 0.6% by mass or less, based on the total amount of the lubricating oil composition, and a content ratio of the sulfur-based antioxidant to the aromatic carboxylic acid ester by mass is in a range of 0.20 to 3.0.
2 more elements
A method for producing a lubricating oil composition, comprising:
- mixing a base oil, an aromatic carboxylic acid ester having one or more hydroxyl groups, and a sulfur-based antioxidant,
- setting a content of phosphorus atoms to 0.06% by mass or less, based on a total amount of the lubricating oil composition;
- and
- setting a sulfated ash content to 0.6% by mass or less, based on the total amount of the lubricating oil composition,
- wherein a content ratio of the sulfur-based antioxidant to the aromatic carboxylic acid ester by mass is in a range of 0.20 to 3.0.
2 more elements
Dependencies are inferred from the claim text.