First, a hindered phenol with hydroxyl group (GM-ME) was obtained
by thiol-acrylate Michael addition between 2-tert-butyl-6-
(3-tert-butyl-2-hydroxy-5-methylphenyl) methyl-4-methylphenyl
acrylate (GM) and 2-mercaptoethanol (ME), then two
macromolecular hindered phenol antioxidants with thioether and
urethane groups, GM-ME-IPDI and GM-ME-TDI, were obtained after
GM-ME reacted with isophorone diisocyanate (IPDI) and
toluene diisocynate (TDI), respectively.