Idemitsu Kosan Company, Limited

Ryouichi Okuda

Saburo Koyama

Hiroshige Matsuoka

Provided is a metal working oil composition not containing a chlorine compound. Its working capabilities in low-speed cutting or heavy cutting operations such as broaching or gun-drilling operations are comparable to or better than those of chlorine compound-containing lubricant oil. The composition comprises 100 parts by weight of a lubricant base oil that comprises from 0 to 30% by weight of (a) a mineral base oil and from 70% to 100% by weight of (b) a &pgr; electron-containing synthetic base oil, from 0.1 to 25 parts by weight of (c) a sulfur-containing extreme-pressure agent, and from 0.1 to 7 parts by weight of (d) an alkali metal and/or alkaline earth metal sulfonate.

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Ichihara, Japan

Ryouichi Okuda