WATER-SOLUBLE POLYMERIC ANTIOXIDANTS

A synthesis is reported of polymeric antioxidant compositions by conde nsation of sterically hindered phenol derivatives with N-vinylpyrrolid one copolymers. Conditions have been determined that allow preparation of water-soluble condensation products. Variation of the nature of po lymer-support, antioxidant, and polymer-antioxidant bond (axomethine, ester, amide, hydrazide, or -C-N-) allow the rate of elimination of an tioxidant from the polymer to be controlled.