Claims
- 1. A fluid composition comprising:
a major amount of a phosphate ester base stock and a minor amount of an alkali metal perfluorophosphate or mixture of alkali metal perfluorophosphates and a mono epoxycyclohexane carboxylate.
- 2. The composition of claim 1 wherein the alkali metal perfluorophosphate or mixtures of alkali metal perfluorophosphates are present in an amount of from about 0.01 wt % to about 0.5 wt % based on the weight of the composition.
- 3. The composition of claim 2 wherein the mono epoxycyclohexane carboxylate is represented by the formula
- 4. A hydraulic fluid composition comprising:
(a) a major amount of a phosphate ester base stock comprising, based on the weight of base stock;
(i) from 10 to 100 wt % of trialkyl phosphate; (ii) from 0 to 75 wt % of dialkyl aryl phosphates; (iii) from 0 to 30 wt % of alkyldiaryl phosphates; and (iv) from 0 to 20 wt % of alkylated triaryl phosphates, and wherein the alkyl groups of (i) to (iv) have from 3 to 8 carbon atoms; and (b) both
(i) from about 0.01 wt % to about 0.5 wt %, based on the weight of the composition of an alkali metal perfluorophosphate or mixtures of alkali-metal perfluorophosphate; and (ii) from about 1 wt % to about 10 wt %, based on the weight of the composition, of a compound having the formula 3where R is an alkyl group of 1 to 10 carbon atoms or —(CH2)nOR, where n is an integer of 1 to 3 and R is an alkyl group of 1 to 10 carbon atoms.
- 5. The composition of claim 4 wherein the alkali metal of the perfluorophosphate is potassium and R is a branched alkyl group of 4 to 8 carbon atoms.
- 6. The composition of claim 5 including a poly(alkylacrylate) or poly(alkylmethacrylate) viscosity index improver (VII).
- 7. The composition of claim 6 wherein the VII is present at from about 3 wt % to about 10 wt % based on the weight of the composition.
Parent Case Info
[0001] This application claims the benefit of U.S. Serial No. 60/426,946 filed Nov. 15, 2002.
Provisional Applications (1)
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Number |
Date |
Country |
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60426946 |
Nov 2002 |
US |