| US 7,563,751 B2 | ||
| Lubricating oil composition | ||
| Kazuhiro Yagishita, Kanagawa (Japan) | ||
| Assigned to Nippon Oil Corporation, Tokyo (Japan) | ||
| Appl. No. 10/523,566 PCT Filed Aug. 05, 2003, PCT No. PCT/JP03/09952 § 371(c)(1), (2), (4) Date Feb. 03, 2005, PCT Pub. No. WO2004/013263, PCT Pub. Date Feb. 12, 2004. |
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| Claims priority of application No. 2002-227530 (JP), filed on Aug. 05, 2002. | ||
| Prior Publication US 2005/0272616 A1, Dec. 08, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C10M 159/22 (2006.01) | ||
| U.S. Cl. 508—460 | 10 Claims |
| 1. A lubricating oil composition, comprising: a lubricant base oil having a sulfur content adjusted to 0.1% or less by mass;
and the following (A) incorporated into the base oil in an amount of 0.005 to 0.5% by mass of the total of the composition,
the amount being an amount in terms of the metal element therein:
(A) one or more alkali metal or alkaline earth metal salicylates in which the ratio (or percentage) of a salicylate constituent
represented by the following general formula (1) is adjusted to 10% or more by mol, and/or one or more (over)basic salts thereof:
 wherein either one of R1 and R2 in the general formula (1) is an alkyl group which has 10 to 40 carbon atoms, and the other is a hydrocarbon group which has
less than 5 carbon atoms (and may contain oxygen or nitrogen); and M represents an alkali metal or alkaline earth metal and
n represents 1 or 2 in accordance with the valence number of the metal in the general formula (1).
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