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US 6,586,376 B1Granted
Heat resistant lubricating oil composition
AssigneeExxonMobil Research and Engineering Company
InventorsHiroshi Nakanishi, Ko Onodera, Makoto Kanbara, Atsuhisa Kobori, Yoshinobu Nakamura
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Abstract
A heat resistant lubricating oil composition which exhibits high heat resistance and oxidation resistance under high temperature conditions, and can withstand severe working conditions, as in jet engine turbines. The lubricating oil composition comprises a polyphenylthioether of formula I in a lubricating base oil, comprising any one of a polyol ester, a polyphenyl ether, an organopolysiloxane and mixtures thereof.
Claims8
A heat resistant lubricating oil composition, comprising:
- a lubricating base oil comprising
- (a) from 10% to 90% by weight of
- (i) a polyol ester, or
- (ii) an admixture of a polyphenylether and a polyol ester,
- wherein said polyol ester is an ester of a hindered alcohol having 5 to 30 carbon atoms and an aliphatic acid which is a linear or branched aliphatic acid of 4 to 10 carbon atoms;
- and
- wherein said polyphenyl ether is a compound which contains 3 to 6 aromatic rings, in which each aromatic ring is bonded to another via an oxygen atom;
- and
- (b) from 90% to 10% by weight of a polyphenyl thioether represented by formula I as follows:
- where R1, R2, and R3 may be identical or different and each represents a hydrogen atom or a hydrocarbon group of 1 to 24 carbon atoms, and x, y and z may be identical or different and each represents an integer from 1 to 4, and m represents an integer from 1 to 3.
7 more elements
Dependencies are inferred from the claim text.