Patent ID: 6426324
Filing Date: 2002-07-30
Classification: C10M,C10N

Abstract:
An antioxidant composition comprising the reaction product of:(a) at least one N-aryl naphthylamine (PNA); (b) at least one diphenylamine (DPA); and (c) about 0.5 to about 3 moles of an organic peroxide free radical source per mole of said PNA and said DPA; said N-aryl naphthylamine having a total of from one to six and on each aryl or naphthyl ring up to three alkyl, styryl, or methyl substituted styryl groups, or combinations thereof, wherein said alkyl has from 1 to 20 carbon atoms; said diphenylamine having a total of from one to six and on each phenyl ring up to three alkyl, styryl, or methyl substituted styryl groups, or combinations thereof, each alkyl having from 1 to 20 carbon atoms; wherein the mole ratio of said diphenylamine to said N-aryl naphthylamine is from 1:1 to 10:1, wherein the reaction of (a), (b), and (c) is conducted at temperatures from about 70Â° C. to about 200Â° C., wherein the reaction product has at least 10 mole percent of said DPA in the form of homo-oligomers of DPA, and wherein the reaction product has at least 35 mole percent of said PNA and DPA in the form of cross oligomers of DPA and PNA.