Functional fluid compositions containing epoxide stabilizers
AssigneeMonsanto Company
InventorsJohn F. Herber, William R. Richard, Jr., Robert W. Street
Life of this patent
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Abstract
Functional fluid compositions comprising a major amount of a base stock material which is an ester or amide of an acid phosphorus, a di- or tricarboxylic acid ester, an ester of a polyhydric compound or mixtures thereof, optionally minor amounts of other base stock materials or base stock modifiers such as viscosity index improvers, cavitation damage inhibitors, and lubricity agents, and an additive amount of an acid scavenger and corrosion inhibitor which is a monoepoxy norbornyl carboxylate such as C.sub.1.sub.-4 alkyl-5,6-epoxynorbornane carboxylate. The compositions are particularly useful as aircraft hydraulic fluids.
Claims10
A functional fluid composition comprising at
- A. least about 50 percent by weight of a base stock material selected from the group consisting of esters and amides of an acid of phosphorus, di- or tri- carboxylic acid esters, esters of polyhydric compounds, and mixtures thereof, and
- B. from about 0.1 to 10 percent by weight of an epoxide compound represented by the structure ##SPC3##
- wherein R.sub.1 is -- (CH.sub.2).sub.0.sub.-3 --C(O)OR, --C(O)R, --OR, or --CH.sub.2 OR where R is an alkyl radical having from 1 to about 18 carbon atoms, R.sub.2 is R.sub.1, hydrogen, or an alkyl radical having from 1 to about 9 carbon atoms, and R.sub.3 and R.sub.4 are individually hydrogen or an alkyl radical having from 1 to about 4 carbon atoms.
Dependencies are inferred from the claim text.