Antioxidant hydrazides and derivatives thereof having multifunctional activity

In a method for stabilizing lubricants, greases, and polymeric systems, the improvement that comprises employing as at least one stabilizer at least one hydrazide compound of the formula:

• wherein:
• R1 is selected from the group consisting of alkyl, alkyl ether, and phenyl;
• R2, R3, R4, R5, and R6 are independently selected from the group consisting of hydrogen, alkyl, alkyl ether, and aryl;
• and
• n is an integer of from 0 to 10;
• and wherein:
• when R1 is phenyl, it is of the structure:
• wherein R7, R8, and R9 are independently selected from the group consisting of hydrogen, alkyl, alkyl ether, and aryl, or R7 can be combined with R8 to form a ring of 5 or 6 carbon atoms.

A composition comprising a maleated polymer functionalized by reaction with a hydrazide compound of the formula:

• wherein:
• R1 is selected from the group consisting of alkyl, alkyl ether, and phenyl;
• R2, R3, R4, R5, and R6 are independently selected from the group consisting of hydrogen, alkyl, alkyl ether, and aryl;
• and
• n is an integer of from 0 to 10;
• and wherein:
• when R1 is phenyl, it is of the structure:
• wherein R7, R8, and R9 are independently selected from the group consisting of hydrogen, alkyl, alkyl ether, and aryl, or R7 can be combined with R8 to form a ring of 5 or 6 carbon atoms.