| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubricating oil composition having both of improved flame retardancy and biodegradability.SOLUTION: The biodegradable lubricating oil composition having flame retardancy comprises: (1) a base oil containing 60 mass% or more of an oil originating in a vegetable oil and 40 mass% or less of a polyol ester; and (2) 0.1-5 mass% of polymethacrylate having a mass-average molecular weight of 20,000 to 300,000. |
