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US 11,111,456 B2Granted
Lubricant composition for hydraulic oil
AssigneeDL Chemical CO., LTD.
InventorsHyeung Jin Lee, Jin Hun Ju
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Abstract
The present invention relates to a lubricant composition, and more particularly to a lubricant composition, which has superior oxidation stability and friction characteristics even under harsh conditions of high temperature and high pressure and is thus suitable for use in hydraulic oil. The lubricant composition of the present invention includes a base oil, a liquid olefin copolymer, a phosphorothioate compound, and phosphonium phosphate.
Claims11
A lubricant composition, comprising:
- 61.28 to 96.64% by weight of a base oil, 0.5 to 30% by weight of a liquid olefin copolymer, 0.1 to 3% by weight of a phosphorothioate compound, and 0.05 to 2% by weight of phosphonium phosphate,
- wherein the phosphorothioate compound is at least one selected from the group consisting of monophosphorothioate, diphosphorothioate, triphosphorothioate, methylphosphorothioate, ethylphosphorothioate, and sulfonylphosphorothioate, and
- wherein the phosphonium phosphate has a structure of Chemical Formula 7 below
Dependencies are inferred from the claim text.