Synthetic aircraft turbine oil
AssigneeTexaco Inc.
InventorsRussell R. Reinhard, Roberta Yaffe
Life of this patent
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Abstract
Synthetic lubricating oil composition having improved oxidation stability comprising a major portion of an aliphatic ester base oil having lubricating properties, formed by the reaction of pentaerythritol and an organic monocarboxylic acid and containing a phenylnaphthylamine, a dialkyldiphenylamine, a hydrocarbyl phosphate ester, a polyhydroxy anthraquninone, an alkylamine salt of 3-amino-triazole-dodecenylsuccinamic acid, 2-hydroxylpropyl-N,N-dibutyldithiocarbamate, and an alkyl amine salt of a methyl acid phosphate.
Claims16
A synthetic lubricating oil consisting of a major portion of an aliphatic ester base oil having lubricating properties formed from the reaction of pentaerythritol or a polypentaerythritol or trimethylolpropane and an organic monocarboxylic acid having from about 2 to 18 carbon atoms per molecule containing:
- (a) from about 0.3 to 5 percent by weight of the lubricating oil composition of a phenylnaphthylamine or an alkyl or alkaryl phenyl napthylamine in which the alkyl radical has from 4 to 12 carbon atoms,
- (b) from about 0.3 to 5 percent by weight of a dialkyldiphenylamine in which the alkyl radical has from 4 to 12 carbon atoms,
- (c) from about 0.25 to 10 percent by weight of a hydrocarbyl phosphate ester in which said hydrocarbyl radical contains an aryl ring and contains from about 6 to 18 carbon atoms,
- (d) from about 0.01 to 0.5 percent by weight of a polyhydroxy-substituted anthraquinone,
- (e) from about 0.05 to 1.0 percent by weight of a t-alkylamine salt of 3-aminotriazole-dodecenyl-succinamic acid,
- (f) from about 0.005 to 0.50 percent by weight of 2-hydroxylpropyl-N,N-dibutyldithiocarbamate, and
- (g) from about 0.001 to 0.10 percent by weight of a tertiary alkylamine salt of methyl acid phosphate.
Dependencies are inferred from the claim text.