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US 5,205,951 AGranted
Phosphate ester-based functional fluids containing an epoxide and a compatible streaming potential-inhibiting metal salt
AssigneeChevron Research and Technology Company
InventorHugh S. MacKinnon
Life of this patent
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Abstract
A functional fluid comprising an effective amount of a soluble streaming potential-inhibiting metal salt; an epoxide; and a major amount of a phosphate ester; wherein the metal salt is compatible with the epoxide component of the functional fluid at a temperature of about 260.degree. F. and the functional fluid has a wall current of less than 0.15 microamperes.
Claims21
A functional fluid comprising:
- (a) 5 to 5000 parts per million of a soluble streaming potential-inhibiting metal salt having a cation selected from the group consisting of barium, cadmium, calcium, cobalt, copper, gold, iron, magnesium, manganese, nickel, tin, titanium, zinc and zirconium;
- and an inorganic anion selected from the group consisting of borate, bromide, chloride, iodide, nitrate, phosphate, sulfate and tetrafluoroborate;
- (b) a minor amount of an epoxide having the formula:
- ##STR3## wherein X is a divalent organic radical containing 1 to 10 carbon atoms, from 0 to 6 oxygen atoms and from 0 to 6 nitrogen atoms;
- and each R is the same or different and is selected from the group consisting of hydrogen and lower aliphatic radicals;
- and
- (c) a major amount of a phosphate ester;
- wherein the functional fluid has a wall current of less than 0.15 microamperes and wherein said metal salt is compatible with said epoxide in said functional fluid at a temperature of about 260.degree. F.
5 more elements
A functional fluid comprising:
- (a) 5 to 5000 parts per million of a soluble streaming potential-inhibiting metal salt having a cation selected from the group consisting of barium, cadmium, calcium, cobalt, copper, gold, iron, magnesium, manganese, nickel, tin, titanium, zinc and zirconium;
- and an inorganic anion selected from the group consisting of borate, bromide, chloride, iodide, nitrate, phosphate, sulfate and tetrafluoroborate;
- (b) a minor amount of an epoxide having the formula:
- ##STR4## wherein X is a divalent organic radical containing 1 to 10 carbon atoms, from 0 to 6 carbon atoms and from 0 to 6 nitrogen atoms;
- and each R is the same or different and is selected from the group consisting of hydrogen and lower aliphatic radicals;
- and
- (c) a major amount of a phosphate ester;
- wherein the functional fluid has a wall current of less than 0.15 microamperes and the acid number of said functional fluid does not exceed 1.5 milligrams of potassium hydroxide per gram of fluid when said fluid is heated for 168 hours at about 260.degree. F. in the presence of copper and steel coupons.
5 more elements
A functional fluid comprising:
- (a) 5 to 5000 parts per million of a soluble streaming potential-inhibiting metal salt having a cation selected from the group consisting of barium, cadmium, calcium, cobalt, copper, gold, iron, magnesium, manganese, nickel, tin, titanium, zinc and zirconium;
- and an inorganic anion selected from the group consisting of borate, bromide, chloride, iodide, nitrate, phosphate, sulfate and tetrafluoroborate;
- (b) an epoxide having the formula:
- ##STR5## wherein X is a divalent organic radical containing 1 to 10 carbon atoms, from 0 to 6 oxygen atoms and from 0 to 6 nitrogen atoms;
- and each R is the same or different and is selected from the group consisting of hydrogen and lower aliphatic radicals in an amount sufficient to provide the fluid with an oxirane oxygen content of 0.05 to 1.5 percent by weight;
- and
- (c) a major amount of a phosphate ester;
- wherein the functional fluid has a wall current of less than 0.15 microamperes and wherein the oxirane oxygen current of said functional fluid does not decrease by more than 50 percent when said fluid is heated for 96 hours at about 260.degree. F. in the presence of copper and steel coupons.
5 more elements
Dependencies are inferred from the claim text.