An antioxidant composition suitable for ester fluid lubricants is the reaction product of diphenylamine and N-aryl naphthylamine in the presence of an organic peroxide. The mole ratio of diphenylamine:N-aryl naphthylamine is about 1:1 to about 10:1. This results in more oligomeric reaction products and...http://www.google.de/patents/US6426324?utm_source=gb-gplus-sharePatent US6426324 - Lubricant composition
