USE OF N,N-DIALKYLHYDROXYLAMINES AND THEIR PREPARATION

摘要

The compounds of the formula (I) wherein R1 and R2 are independently alkyl of 8 to 36 carbon atoms, are useful for stabilizing a poly(arylene sulfide) resin, a modified polystyrene or a polymer containing a diene component against thermal, oxidative or actinic degradation. N,N-Dialkylhydroxylamines of the formula (I) can be prepared by an improved process involving a reverse Michael reaction of the N-oxides of the corresponding beta -dialkylaminopropionic esters, amides or nitriles or of beta -dialkylaminosuccinyl esters or imides. N,N-Dialkylhydroxylamines of the formula (I) can also be prepared by an improved process involving the direct oxidation of the corresponding N,N-dialkylamines with aqueous hydrogen peroxide in a lower alkanol solvent.