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US 4,828,733 AGranted
Copper salts of hindered phenolic carboxylates and lubricants and fuels containing same
AssigneeMobil Oil Corporation
InventorsLiehpao O. Farng, Horodysky Andrew G.
Life of this patent
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Abstract
Copper salts of hindered phenol carboxylic acids are used in lubricants and fuels compositions as an antioxidant.
Claims10
A lubricating oil or grease composition comprising
- (a) a liquid hydrocarbon and between about 0.0005 and about 5 percent by weight of the total composition of
- (b) a copper salt of a hindered phenolic substituted carboxylic acid, said copper salt having the structural formula:
- ##STR3## where R.sub.1 or R.sub.2 =hydrogen, or hydrocarbyl groups containing 1 to 8 carbon atoms, or tertiary alkyl or aralkyl groups containing 4 to 8 carbon atoms both R.sub.1, and R.sub.2 not being a hydrogen atom simultaneously.
A hydrocarbon composition comprising
- (a) a lubricating oil or grease and between about 0.0005 and about 5 percent by weight of the total composition of
- (b) a copper salt of a hindered phenolic substituted carboxylic acid, said copper salt having the structural formula:
- ##STR4## where R.sub.1 or R.sub.2 =hydrogen, or hydrocarbyl groups containing 1 to 8 carbon atoms, or tertiary alkyl or aralkyl groups containing 4 to 8 carbon atoms both R.sub.1 and R.sub.2 not being a hydrogen atom simultaneously.
- (c) an antioxidant selected from the group consisting of aryl amines, alkylated aryl amines, oxidized aryl amines, diaryl amines, alkylated diaryl amines, naphthyl amines, diphenyl amine derivatives, para-phenylenediamines, quinoline, hydroquinoline, phenyl-alpha-naphthyl amine and coupled aryl or diarylamine, the ratio of antioxidant to copper salt being between about 1 and about 1000 parts by weight of antioxidant to 1 part of copper salt.
1 more element
A method of treating a hydrocarbon liquid comprising adding to it between about 0.0005 and about 5 percent by weight of the total composition of an antioxidant and a copper salt of a hindered phenolic substituted carboxylic acid, said copper salt having the structural formula:
- ##STR5## where R.sub.1 or R.sub.2 =hydrogen, or hydrocarbyl groups containing 1 to 8 carbon atoms, or tertiary alkyl or aralkyl groups containing 4 to 8 carbon atoms both R.sub.1 and R.sub.2 not being a hydrogen atom simultaneously, the ratio of antioxidant to copper salt being between about 1 and about 1000 parts by weight of antioxidant to 1 part of copper salt.
Dependencies are inferred from the claim text.