LUBRICATING OIL ADDITIVE COMPOSITION HAVING IMPROVED VISCOSITY INDEX-RISING CHARACTERISTIC

PROBLEM TO BE SOLVED: To provide a lubricating oil composition having the ratio of the absolute viscosity rise at 40°C to that of the RL216 reference oil at 40°C of less than about 0.8. SOLUTION: The lubricating oil composition comprises less than about 30 wt.% of a relatively low Noack volatility b...

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1. Verfasser:	GROWCOTT PETER
Format:	Patent
Sprache:	eng
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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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a lubricating oil composition having the ratio of the absolute viscosity rise at 40°C to that of the RL216 reference oil at 40°C of less than about 0.8. SOLUTION: The lubricating oil composition comprises less than about 30 wt.% of a relatively low Noack volatility base oil and a viscosity additive comprising a minor effective amount of a sacrifical polymer viscosity index improver having a shear stability index (SSI) of greater than about 45 and a major amount of a viscosity index improver having an SSI of less than about 26. COPYRIGHT: (C)2010,JPO&INPIT