Lubricant compositions containing N-substituted naphthylamines as antioxidants

Abstract

Derivatives of diphenylamine or phenylnaphthylamine of the types ##SPC1## Where R.sub.1, R.sub.9 and R.sub.12 are phenyl or p-tolyl groups and the remaining R's, X and Y may be alkyl or various other substituents, are useful antioxidants for lubricating oils or for various polymeric substrates (e.g. polypropylene) especially in combination with a dialkyl thiodipropionate. Typical antioxidants are 4,4'-bis-(alpha,alpha-p-trimethylbenzyl)diphenylamine made by reacting p,alpha-dimethylstyrene with diphenylamine, and N-(4-alpha,alpha-dimethylbenzylphenyl)-1-(alpha,alpha dimethylbenzyl)-2-napthylamine made by reacting alpha-methylstyrene with N-phenyl-2-naphthylamine.

Dependencies are inferred from the claim text.