Anti-oxidation and/or anti-corrosion agent, lubricating composition containing said agent and method for preparing the same
AssigneeNyco
InventorsPascal Frapin, Georges Issalatif, Jean-Louis Mansoux
Life of this patent
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Abstract
New anti-oxidation and/or anti-corrosion agents representing new products resulting from the reaction of a diphenyl amine compound (DPA) with a phenyl-α-naphthyl amine compound (PAN), possess improved properties, as compared to known additives. Lubricating compositions, in particular for turbines, containing the novel anti-oxidation and/or anti-corrosion agents, and a method for preparing the novel anti-oxidation and/or anti-corrosion agents, as well as the novel lubricating compositions are described.
Claims13
A method for preparing an anti-oxidation and/or anti-corrosion agent for a lubricating oil, consisting in the following steps of:
- a) reacting
- (i) a diphenyl amine compound (DPA) of following formula (I):
- wherein R1 and R2 groups, independently from each other, represent a linear or a branched alkyl group comprising from 4 to 12 carbon atoms,
- with
- (ii) a phenyl-α-naphthyl amine compound (PAN) of following formula (II):
- wherein R3 group represents a linear or a branched alkyl group comprising from 4 to 12 carbon atoms,
- in a compound (I) to compound (II) molar ratio ranging from 2:1 to 5:1 in the presence of potassium permanganate, in a solvent and at a temperature ranging from 85° C. to 150° C.;
- b) cooling the reaction mixture to a temperature of at most 80° C.;
- and
- c) filtering the reaction mixture cooled in step b).
Dependencies are inferred from the claim text.