| abstract |
Abstract Compounds of the formula: (I) wherein R is selected from (1) alkyl radicals having 6 to 20 carbon atoms; (2) phenyl radicals which may be substituted by 1 or 2 alkyl groups having 1 to 8 carbon atoms; or (3) aralkyl radicals having 7 to 12 carbon atoms; and wherein R1 is selected from (1) alkylene radicals having 2 to 6 carbon atoms; (2) cycloalkylene radicals having 5 to 12 carbon atoms; (3) alkylcycloalkylene radicals of th formula -R3-R2(R4)n, wherein R2 is a cycloalkylene radical having 5 to 12 carbon and R3 and R4 are alkylene radicals having 1 to 6 carbon atoms, and n equals 1 or 0; (4) or a group of the formula -R5-YR6, wherein R5 and R6 are alkylene radicals having 2 to 6 carbon atoms and Y is oxygen, sulfur, or a 1,4-pheny-lene radical. These compounds have utility as synergistic stabilizers with phenolic type antioxidants in the stabil-ization of organic materials such as natural and synthetic polymers, rubbers, lubricants and oils, etc. |