Lubricant oil composition for internal combustion engines

Lubricant oil composition for internal combustion engines

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

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: KOGANEI, KATSUYA
Format: Patent
Sprache:eng ; fre ; ger
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 sufficiently 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): Ä(A*GCD5-50 + B)Exp ((C*GCD5-50 + D)KV100)Ü/KV40 > 1, and (b1): E*Exp (F*KV100)/KV40 > 1, wherein, GCD5-50 is a difference between 5% and 50% distillation points ( DEG C) by gas chromatographic distillation test, KV40 and KV100 are kinematic viscosities (mm /s) at 40 DEG C and 100 DEG C, and A to F are constants, A: -3.17 x 10, B: 2.87, C: -3.78 x 10, D: 4.91 x 10, E: 9.41, and F: 2.09 x 10.