Antioxidants for synthetic lubricants and methods and manufacture
AssigneeAnderol, Inc.
InventorEugene P. DiBella
Life of this patent
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Abstract
Provided are compounds of formula wherein R1 is linear or branched alkyl; AR is phenyl, naphthyl, or phenanthryl; and m is 0, 1, or 2; and R2 is an alkyl substituted carboxyl. Lubricating oils comprising a polyol ester lubricant in combination with one or more compounds of Formula I are also provided. Compounds having structures of Formula I are formed by mixing N-4-alkylphenyl-1-naphthylamine, paraformaldehyde, glacial acetic acid, and a polyol ester base lubricant and heating and stirring the mixture to cause a condensation reaction. Water and acetic acid are subsequently removed, thereby providing the compound of formula I in the polyol ester base lubricant.
Claims21
A compound of formula
- wherein R1 is linear or branched alkyl;
- AR is phenyl, naphthyl, or phenanthryl;
- and
- m is 0, 1, or 2;
- and
- R2 is an alkyl substituted carboxyl.
A method comprising:
- mixing N-4-alkylphenyl-1-naphthylamine, paraformaldehyde, glacial acetic acid, and a polyol ester base lubricant;
- heating and stirring the mixture to cause a condensation reaction to form a compound having the formula
- wherein R1 is linear or branched alkyl;
- AR is phenyl, naphthyl, or phenanthryl;
- m is 2, 3 or 4;
- and
- R2 is an alkyl substituted carboxyl;
- distilling off water;
- and
- heating and vacuum stripping the mixture to substantially remove residual water and acetic acid, thereby providing the compound of formula I in the polyol ester base lubricant.
A method of preparing a final lubricant formulation comprising mixing an alkylated phenyl-α-naphthyl amine, formaldehyde, and a base lubricant to form a mixture;
- heating the mixture to cause a condensation reaction, removing water of reaction to form a composition of lubricant and antioxidant;
- blending an additive or additive package into the composition of lubricant and antioxidant to form the final lubricant formulation.
Dependencies are inferred from the claim text.