Hydraulic fluid antioxidant system
AssigneeStauffer Chemical Company
InventorsWilliam F. Gentit, Theodore A. Marolewski
Life of this patent
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Abstract
A hydraulic fluid comprising (1) a base stock material, and (2) a cycloalkyl epoxide and a phenyl naphthylamine in a ratio of from about 1:10 to about 10:1 by weight. By incorporating about 0.1 to about 10 percent by weight of the hydraulic fluid of said epoxide and amine in said hydraulic fluid, acid buildup therein is controlled.
Claims26
A functional fluid composition comprising a mixture of
- a base stock material consisting essentially of an ester or esters of an acid of phosphorus, and from about 0.1 to about 10%, by weight of the total fluid, of an additive combination comprising an epoxycycloalkyl carboxylate and a phenyl naphthylamine, in a ratio of from about 1:10 to about 10:1 by weight.
An aircraft hydraulic fluid comprising a base stock material consisting essentially of an ester or esters of an acid of phosphorus, and from about 0.1 to about 10% by weight of the total fluid of an additive combination comprising an epoxycycloalkyl carboxylate and a phenyl naphthylamine in a ratio from about 1:10 to about 10:1 by weight.
A method for controlling acid buildup in an aircraft hydraulic fluid comprising a base stock selected from the group consisting of esters of an acid of phosphorus, which comprises incorporating in said hydraulic fluid from between about 0.1 to about 10% by weight of an additive comprising an epoxycycloalkyl carboxylate and a phenyl naphthylamine in a ratio of from about 1:10 to about 10:1 by weight.
Dependencies are inferred from the claim text.