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US 4,331,549 AGranted
Hydraulic fluids containing cyano derivatives of ketones
AssigneeThe Dow Chemical Company
InventorBart J. Bremmer
Life of this patent
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Abstract
Hydraulic fluids having high wet equilibrium reflux boiling points, good chemical stability and other desirable characteristics comprise certain cyano-substituted compounds of the formula ##STR1## wherein A and B are specified radicals.
Claims8
A hydraulic fluid comprising
- (I) from 5 percent to 90 percent of one or more cyano-substituted compounds of from 3 to 20 carbons of the formula ##STR7## wherein:
- A is a divalent radical of from 2 to 10 carbons selected from branched or linear alkylene and ##STR8## wherein R.sub.1 is each occurrence hydrogen, methyl or ethyl and m and n are integers equal to or greater than 1;
- B is a monovalent radical of from 1 to 10 carbons selected from branched or linear alkyl and cyano-, hydroxy-, or oxyalkyl-substituted derivatives thereof;
- and ##STR9## furthermore may optionally be oxocycloalkyl, and (II) from 95 percent to 10 percent of a remainder component selected from conventional hydraulic fluid components, additives or mixtures thereof.
1 more element
In the operation of a fluid pressure operating device which uses hydraulic pressure transmission fluid, the improvement comprising using as said hydraulic pressure transmission fluid a fluid comprising one or more cyano-substituted compounds of from 3 to 20 carbons of the formula ##STR13## wherein:
- A is a divalent radical of from 2 to 10 carbons selected from branched or linear alkylene and ##STR14## wherein R.sub.1 is each occurrence hydrogen, methyl or ethyl and m and n are integers equal to or greater than 1;
- B is a monovalent radical of from 1 to 10 carbons selected from branched or linear alkyl and cyano-, hydroxy-, or oxyalkyl-substituted derivatives thereof, and ##STR15## furthermore may optionally be oxocycloalkyl.
Dependencies are inferred from the claim text.