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US 7,018,559 B2Granted
Functional fluid compositions containing epoxide acid scavengers
AssigneeSolutia Inc.
InventorsJingen Zhang, Mark E. Jason, Terry C. Wolfe
Life of this patent
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Abstract
A phosphate ester-based functional fluid composition that generates reduced levels of carboxylic acid during use by incorporating at least one acid scavenger selected from the epoxides of the invention. The phosphate ester-based functional fluids are particularly useful as hydraulic fluids.
Claims9
A functional fluid composition that generates reduced levels of carboxylic acid during use comprising:
- (a) a base stock comprising a phosphate ester, and
- (b) at least one acid scavenger selected from
- (i) epoxides of the formula
- (ii) epoxides of the formula
- (iii) mixtures thereof;
- wherein R1, R2 and R3 are independently selected from H, and —C(O)—R12, and wherein one or two of R1, R2 and R3 are —C(O)—R12;
- R4 is selected from H or —CH3;
- and R5, R6, R7 and R8 are independently selected from H, and —C(O)—R12, and wherein one or two of R5, R6, R7 and R8 are —C(O)—R12;
- wherein;
- R12 is an arylalkyl group having 7 to 12 carbon atoms.
7 more elements
Dependencies are inferred from the claim text.