Base stocks for transmission/gear lubricants

Base stocks for synthetic lubricating oils for use in gear lubricants, automotive heavy and medium duty axle gear lubricants and transmission fluid applications are comprised of: (a) from about 30 % to about 80 % by weight of a poly- alpha -olefin having a branch ratio of greater than 0.19 and havin...

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Bibliographic Details
Main Authors STEPHEN C LAKES, BRUCE J. BEIMESCH
Format Patent
LanguageEnglish
Published 20.02.1998
Edition6
Subjects
CHEMISTRY
FUELS
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:Base stocks for synthetic lubricating oils for use in gear lubricants, automotive heavy and medium duty axle gear lubricants and transmission fluid applications are comprised of: (a) from about 30 % to about 80 % by weight of a poly- alpha -olefin having a branch ratio of greater than 0.19 and having a viscosity of from about 4 to about 8 cSt at 100 DEG C; (b) from about 1 % to about 20 % by weight of an ester having a viscosity such that a lubricant containing said base stock has a high temperature viscosity of from about 4 to about 25 cSt at 100 DEG C and low temperature viscosity of less than about 150,000 cps at -40 DEG C; (c) from about 10 % to about 30 % by weight of a polyisobutylene oligomer having a weight average molecular weight of from 7,500 to about 20,000 Daltons wherein the weight ratio of the poly- alpha -olefin to the ester is from about 5/1 to about 9/1.
Bibliography:Application Number: AU19970036548