Abstract: Isocyanurate esters of carboxyalkylthioalkanoesterphenols useful in the stabilization of organic materials normally susceptible to oxidative degradation are prepared by reacting an appropriate isocyanurate trithiol, which is a selected tris-mercapto alkanoic acid ester of tris-(2-hydroxyethyl) isocyanurate with an appropriate alkenyl compound, which is a selected 4-hydroxy-(mono- or di-alkyl)phenyl alkyl alkenoate. In a preferred embodiment, the ester is 1,3,5-tris [( 3,5-di-tert-butyl-4-hydroxyphenyl)-(3-propyl) oxycarbonylethylthiopropionyloxyethyl] isocyanurate.

Abstract: Disclosed are stabilized A-B-A type block copolymer compositions containing at least two monoalkenyl arene polymer end blocks and at least one polydiene internal block and a stabilizing amount of a ring-substituted N-acyl-para-aminophenol. In two preferred embodiments, the latter compound is N-stearoyl-2,6-di-t-butyl-4-aminophenol, while the block copolymers are polystyrene-polybutadiene-polystyrene and polystyrene-polyisoprene-polystyrene, respectively.