Liquid alkylated diphenylamine antioxidant

Details Liquid alkylated diphenylamine antioxidant Liquid alkylated diphenylamine antioxidant

C - Chemistry, Metallurgy

07

C

C07C 211/55 (2006.01) C07C 29/94 (2006.01) C07C 31/24 (2006.01) C07C 41/46 (2006.01) C07C 43/11 (2006.01) C07C 67/62 (2006.01) C07C 69/34 (2006.01) C07C 209/60 (2006.01) C07C 209/68 (2006.01) C09K 15/18 (2006.01) C10M 133/12 (2006.01)

Patent

CA 2206429

A process for monoalkylating diphenylamine using a clay catalyst is disclosed which results in a reaction product having substantial amounts of desirable monoalkylated diphenylamine and minimal amounts of less desirable disubstituted diphenylamine and unsubstituted diphenylamine. The disclosed process uses clay catalysts which favor monoalkylation over dialkylation and specific conditions such as reaction temperature, mole ratios of alkylating olefin to diphenylamine, reaction times, and catalyst amounts. Preferred olefins are diisobutylene and linear alpha olefins having from 6 or 8 to 18 carbon atoms. When more than 1 wt.% residual unreacted diphenylamine is present it may be converted to alkylated diphenylamine by reacting with styrene, alpha-methylstyrene or isobutylene.

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