ANTIOXIDANT POLYMERIC DIPHENYLAMINE COMPOSITIONS

An antioxidant polymer (e.g., oligomer) composition comprising repeat units of lylamine monomers of formula I wherein R is H, C1-C18 alkyl, C2-C18 alkenyl, C2-C18 alkynyl, -C(O)C1-C18 alkyl, -C(O)aryland R1, R2, R3 and R4 are each independently H or a linear or branched C1-C18 alkyl, C1-C18 alkoxy, C1-C18 alkylamino, C1-C18 dialkylamino, C1-C18 alkylthio, C2-C18 alkenyl, C2-C18 alkynyl or C7-C21aralkyl and wherein the number average molecular weight (Mn) of the polymer is from about 350 g/mol to about 5,000 g/mol are highly effective antioxidants in lubricant compositions. The polymer compositions may be prepared by a process comprising subjecting diarylamine monomers to dehydrocondensation conditions. 一种抗氧化剂聚合物(例如低聚物)组合物包含式I的二苯基胺单体的重复单元，其中R为H、C-C烷基、C-C烯基、C-C炔基、-C(O)C-C烷基、-C(O)芳基，并且R、R、R和R各自独立地为H或直链或支链C-C烷基、C-C烷氧基、C-C烷基氨基、C-C二烷基氨基、C-C烷硫基、C-C烯基、C-C炔基或C-C芳烷基，并且其中所述聚合物的数均分子量(Mn)为约350g/mol到约5000g/mol，其为润滑剂组合物中的高效抗氧化剂。所述聚合物组合物可通过包含使二芳基胺单体经历脱氢缩合条件的方法制备。