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US 10,563,145 B2Granted
Alkylated 3-hydroxydiphenylamine antioxidants
AssigneeLANXESS Solutions US Inc.
InventorRobert G. Rowland
Life of this patent
Estimating the term…
Abstract
Certain alkylated 3-hydroxyphenylamine antioxidants wherein one phenyl is substituted by at least one hydroxyl group at the 3-position relative to the amine and the other phenyl is substituted by at least one substituent having 4 or more carbon atoms are surprisingly effective antioxidants, especially in lubricating oils.
Claims20
An alkylated 3-hydroxydiphenylamine of formula I:
- wherein n is 0 or 1;
- m is 0, 1 or 2;
- x is 0, 1 or 2 and y is 1, 2 or 3;
- each R is independently C4-24 alkyl or C4-24 alkyl substituted by one or more hydroxyl and/or interrupted by one or more oxygen atom,
- or two adjacent R groups together with the carbons to which they are attached form a 5 to 8 member heterocyclic ring or a 6 to 8 member non-aromatic carbocyclic ring, which heterocyclic or non-aromatic carbocyclic ring is optionally substituted by alkyl, hydroxyl or alkoxy;
- at least one carbon atom adjacent to the amine nitrogen is unsubstituted;
- and
- wherein the total number of carbon atoms of the combined groups R is 12 or higher.
5 more elements
A lubricating oil composition comprising
- a) a lubricating oil, and
- b) one or more alkylated 3-hydroxydiphenylamine according to formula I:
- wherein n is 0 or 1;
- m is 0, 1 or 2;
- x is 0, 1 or 2 and y is 1, 2 or 3;
- each R is independently C4-24 alkyl or C4-24 alkyl substituted by one or more hydroxyl and/or interrupted by one or more oxygen atom,
- or two adjacent R groups together with the carbons to which they are attached form a 5 to 8 member heterocyclic ring or a 6 to 8 member non-aromatic carbocyclic ring, which heterocyclic or non-aromatic carbocyclic ring is optionally substituted by alkyl, hydroxyl or alkoxy;
- and wherein at least one carbon atom adjacent to the amine nitrogen is unsubstituted.
5 more elements
Dependencies are inferred from the claim text.