High temperature stable lubricant mixed polyol ester composition containing an aromatic carboxylic acid and method for making the same
AssigneeBP Corporation North America Inc.
InventorsPatrick E. Godici, Jeenok T. Kim, Martin A. Krevalis, Richard H. Schlosberg
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Abstract
The present invention relates, generally, to a high temperature stable mixed polyol ester lubricant composition partly containing an aromatic carboxylic acid ester and a process of making the same. Typically, the aromatic acid ester is benzoic acid, and the lubricant composition preferably comprises a mixture of linear C5, i-C9, and linear C7-10 aliphatic carboxylic acid. The esters are preferably formed from an aliphatic polyol. These mixed polyol esters are useful in aero-derived gas turbine engines.
Claims20
A lubricant composition, comprising:
- a mixed polyol ester, wherein the carboxylic acid portion of the ester, comprises:
- (a) 2-40 mol % of an aromatic carboxylic acid;
- and,
- (b) 60-98 mol % of a C5-20 aliphatic carboxylic acid;
- and the alcohol portion of the ester, comprises:
- an aliphatic polyol.
A process for preparing a mixed polyol ester, comprising:
- (i) contacting 2-40 mol % of an aromatic carboxylic acid with 60-98 mol % of a C5-20 aliphatic carboxylic acid;
- and,
- (ii) esterifying the resulting mixture with an aliphatic polyol.
A process for preparing a mixed polyol ester, comprising:
- (i) esterifying an aromatic carboxylic acid with an aliphatic polyol;
- and,
- (ii) contacting the esterification mixture with a C5-20 aliphatic carboxylic acid;
- wherein the resulting ester is a mixed ester and the carboxylic acid portion of the ester, comprises:
- (a) 2-40 mol % of an aromatic carboxylic acid;
- and, (b) 60-98 mol % of a C5-20 aliphatic carboxylic acid.
A process for preparing a mixed polyol ester, comprising:
- (i) esterifying a C5-20 aliphatic carboxylic acid with an aliphatic polyol;
- and,
- (ii) contacting the esterification mixture with an aromatic carboxylic acid;
- wherein the resulting ester is a mixed ester and the carboxylic acid portion of the ester, comprises:
- (a) 2-40 mol % of an aromatic carboxylic acid;
- and, (b) 60-98 mol % of a C5-20 aliphatic carboxylic acid.
A synthetic ester composition exhibiting enhanced thermal and oxidative stability comprising the reaction product of:
- an aliphatic polyol having the general formula R(OH)n wherein R is an aliphatic or cyclo-aliphatic hydrocarbyl group having from about 4 to 15 carbon atoms and n is at least 2;
- and 60-98 mol % of at least one C5 to C20 aliphatic carboxylic acid or a mixture thereof with 2-40 mol % of at least one aromatic carboxylic acid.
Dependencies are inferred from the claim text.