| 摘要 |
PROBLEM TO BE SOLVED: To obtain a mechanical work oil composition useful for grinding, etc., excellent in seizure prevention, processability and environmental pollution resistance, containing a fixed amount of a partial ester of a specific polyfunctional carboxylic acid. SOLUTION: This mechanical work oil composition contains 0.01-100 mass % of a partial ester of a polyfunctional carboxylic acid containing two or more carboxyl groups in one molecule and no substituent group between the carboxyl groups in the main chain or a <=4C alkyl or alkenyl substituent group or a hydroxy- or an ester-substituent group and more preferably 0.01-80wt.% of an organic polysulfide such as dioctyl disulfide. |
