US 3,931,022 AGranted

Turbine lubricant and method

AssigneeTexaco Inc.

InventorsRalph P. Chesluk, Norman R. Odell, Lawrence F. Kuntschik, James A. White

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Abstract

Described herein is a lubricating composition exhibiting vapor space rust protection, improved oxidation stability and air release properties comprising a mineral lubricating oil containing from 0.02 to 3.0 weight percent vapor space rust inhibitor such as a C.sub.8 -C.sub.10 aliphatic carboxylic acid; 0.001 to 0.3 wt % substituted heterocyclic antioxidant such as benzotriazole; 0.05 to 1.0 wt % of a rust inhibitor such as alkyl-succinic acid/alkyl acid phosphate/phenol; 0.001 to 0.500 wt % polymeric antifoamant such as a polyacrylate; 0.01 to 5.0 wt % of an aryl phosphate such as tricresylphosphate; and 0.01 to 2.00 wt % of a hindered alkyl phenol antioxidant such as 4-methyl-2, 6-di-t-butylphenol.

Claims13

Dependent claims

A vapor phase rust inhibiting, oxidation stable, lubricating composition having improved air release properties and comprising in combination, a major amount of a mineral lubricating oil having an SUS viscosity at 100.degree.F. between 70 and 5000;

a minor effective oxidation stabilizing amount of a heterocyclic anti-oxidant compound of the formula:
##EQU2## wherein R and R.sub.1 are alkyl or aryl, straight or branched chain, or form a six membered ring and have one to 30 carbon atoms each;
or can be absent and at least one member of the group ABCDE is carbon and at least three other members are selected from the group of nitrogen, oxygen and sulfur, a minor effective antifoaming amount of an antifoaming agent, a minor effective vapor phase rust inhibiting amount of a C.sub.8 to C.sub.10 aliphatic monocarboxylic acid, a minor work load improving amount of tricresylphosphate and a minor effective antioxidant amount of an alkylphenol antioxidant.

Dependencies are inferred from the claim text.