Patent ID: 6355839
Filing Date: 2002-03-12
Classification: C07C

Abstract:
A process for alkylating diphenylamine, comprising:in one step reacting diphenylamine with a polyisobutylene in the presence of a suitable alkylation catalyst at a suitable alkylation reaction temperature less than about 200Â° C., wherein said polyisobutylene contains at least about 25% of a methylvinylidene isomer and wherein the number average molecular weight of said polyisobutylene is in the range of about 120 to about 600 and wherein the mole ratio of said polyisobutylene to said diphenylamine is in the range of 1.0:1.0 to 4.0:1.0 and forming an alkylated diphenylamine product wherein said alkylated diphenylamine product is liquid at room temperature and atmospheric pressure.