LUBRICANT OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINES

This invention provides a lubricant oil composition for internal combustion engines which shows a suffiently low volatility at high temperature and good low-temperature viscosity characteristics. The lubricant oil composition for internal combustion engines comprises a base oil which simultaneously...

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Bibliographische Detailangaben
1. Verfasser:	KOGANEI, KATSUYA
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY FUELS INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATINGCOMPOSITIONS LUBRICANTS LUBRICATING COMPOSITIONS METALLURGY PEAT PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MONOXIDE USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION
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Beschreibung
Zusammenfassung:	This invention provides a lubricant oil composition for internal combustion engines which shows a suffiently low volatility at high temperature and good low-temperature viscosity characteristics. The lubricant oil composition for internal combustion engines comprises a base oil which simultaneously satisfies the following relationships (a1) and (b1): (a1): ¢(A~GCD5-50 + B)Exp((C~GCD5-50 + D)KV100)!/KV40>1, and (b1): E~Exp(F~KV100)/KV40>1, wherein, GCD5-50 is a difference between 5% and 50% distillation points (.degree.C) by gas chromatographic distillation test, KV40 and KV100 are kinematic viscosiries (mm2/s) at 40.degree.C and 100.degree.C, and A to F are constants, A: -3.17 x 10-3, B: 2.87, C: -3.78 x 10-4, D: 4.91 x 10-1, E: 9.41, and F: 2.09 x 10-1.