Imines of 2,4-diaminodiphenyl ethers as antioxidants for lubricating oils and greases
AssigneeUop LLC
InventorJohn T. Roberts
Life of this patent
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Abstract
Imines of 2,4'-diaminodiphenyl ethers are effective antioxidants in petroleum and petroleum-related products. Especially desirable are 2,4'-bis-(N,N'-arylmethylideneamino)phenyl ethers, where the aryl moiety is a heteroaromatic group.
Claims21
A method of inhibiting oxidation in lubricating oils and greases comprising adding an antioxidant amount to said product of a material with the structure ##STR3## where each A is independently selected from the group consisting of unsubstituted and ring-substituted aromatic and heteroaromatic rings, and B is selected from the group consisting of hydrogen, halogen, alkoxy and alkylmercapto wherein the carbonaceous portion contains up to about 18 carbon atoms.
A composition comprising a major amount of a lubricating oil or grease and a minor antioxidant amount from about 0.05% to about 5% by weight of a material with the structure, ##STR4## where each A is independently selected from the group consisting of unsubstituted and ring-substituted aromatic and heteroaromatic rings, and B is selected from the group consisting of hydrogen, halogen, alkoxy and alkylmercapto wherein the carbonaceous portion contains up to about 18 carbon atoms.
A compound with the formula ##STR5## where each A is an unsubstituted or substituted heteroaromatic ring and B is selected from the group consisting of hydrogen, halogen, alkoxy and alkylmercapto wherein the carbonaceous portion contains up to about 18 carbon atoms.
Dependencies are inferred from the claim text.