| (19) |
 |
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(11) |
EP 0 719 852 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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31.07.1996 Bulletin 1996/31 |
| (43) |
Date of publication A2: |
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03.07.1996 Bulletin 1996/27 |
| (22) |
Date of filing: 22.12.1995 |
|
| (51) |
International Patent Classification (IPC)6: C10M 141/08, C10M 163/00, C10M 169/04
// (C10M141/08, 129:40, 135:10),(C10M163/00, 129:40, 159:24),(C10M169/04, 101:02,
129:40, 135:10, 159:24), C10N10:02, C10N20:02, C10N40:06, C10N40:22 |
|
| (84) |
Designated Contracting States: |
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BE DE ES FR GB IT NL |
| (30) |
Priority: |
28.12.1994 JP 339601/94
|
| (71) |
Applicant: TONEN CORPORATION |
|
Chiyoda-Ku,
Tokyo 100 (JP) |
|
| (72) |
Inventor: |
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- Matsushita, Shouzou
Sakado-Shi,
Saitama-ken (JP)
|
| (74) |
Representative: Somers, Harold Arnold |
|
ESSO Engineering (Europe) Ltd.
Patents & Licences
Mailpoint 72
Esso House
Ermyn Way
Leatherhead,
Surrey KT22 8XE
Leatherhead,
Surrey KT22 8XE (GB) |
|
| |
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| (54) |
Lubricant oil composition |
(57) A lubricant oil composition comprising a minor portion of calcium sulfonate(s), barium
sulfonate(s), or mixture thereof being neutral or having the total base number of
100 mg KOG/g or less, and straight chain univalent fatty acid(s) having 8 to 18 carbon
atoms and a major portion of a base oil of mineral oil series and/or synthetic oil
series, said base oil having a kinematic viscosity of 10 to 500 mm
2/s at 40°C.
The lubricant oil composition of the present invention exerts excellent separation
properties from a cutting fluid prepared by diluting a water-soluble cutting fluid.
Therefore, the composition so readily separates and floats in a reservoir tank for
the cutting fluid that the composition can be removed simply by means of an oil skimmer
and the like. Thus, the properties of the water-soluble cutting fluid can be maintained
for a long term, with no occurrence of poor work environment due to rot and so on.