Antioxidant production

Details Antioxidant production Antioxidant production

C - Chemistry, Metallurgy

09

K

31/79

C09K 15/18 (2006.01) C07C 209/68 (2006.01) C07C 211/54 (2006.01) C10M 133/12 (2006.01)

Patent

CA 1276446

Antioxidant Production Abstract of the Disclosure Process is described for the production of a liquid antioxidant composition by reaction of diphenylamine with diisobutylene compri- sing reacting diphenylamine with a molar excess of diisobutylene in the presence of an activated earth catalyst, while ensuring that the concentration of diisobutylene remains substantially constant throughout the reaction period at a reaction temperature of at least 160°C, the reaction being effected for such a period that the content of 4,4'-dioctyldiphenylamine in the reaction mass, excluding catalyst, is below 30 % by weight and that of diphenylamine is below 10 % by weight; removing catalyst and unreacted diisobutylene; and isolating the resulting liquid product; the product of this process; and the use of this product as a stabiliser for organic material against oxidative degradation.

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