abstract |
(57) [Problem] To provide a machine tool oil composition having a reduced coefficient of friction and no problem of metal corrosion. SOLUTION: In the base oil, (a) the following general formula (I) R 1 -OCH 2 CH (OH) CH 2 OH (I) (wherein, R 1 is an alkyl group having 12 to 24 carbon atoms) Or an alkenyl group), and (b) a phosphate ester or an amine salt thereof. |