Gear oil compositions

The invention provides gear oil compositions comprising a base oil and a hydrogenated star polymer comprising at least four arms, each arm comprising, before hydrogenation, polymerised conjugated diene monomer units and having a weight average molecular weight in the range of from 3,000 to 15,000; a...

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Bibliographic Details
Main Authors RHODES, ROBERT BARNETT, ECKERT, RUDOLF JOSEF, LOEFFLER, DONALD EDWARD
Format Patent
LanguageEnglish
French
German
Published 03.06.1992
Subjects
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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Summary:The invention provides gear oil compositions comprising a base oil and a hydrogenated star polymer comprising at least four arms, each arm comprising, before hydrogenation, polymerised conjugated diene monomer units and having a weight average molecular weight in the range of from 3,000 to 15,000; a method of preparing said compositions; and the use of said hydrogenated star polymers as viscosity index improver additives in gear oil compositions.
Bibliography:Application Number: EP19910202468