Emulsion Rubbers Copolymerized with Monomeric Antioxidants

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Abstract
It has been shown that dual functional compounds bearing antioxidant and polymerizable functions can be copolymerized with numerous monomers in emulsion systems. Somewhat higher initiator levels and/or increased temperature appear to be required for normal polymerization rates in the presence of these monomers. The only incompatible initiator—monomer combinations found are those of persulfate and benzoyl peroxide with amine antioxidants. The dual functional monomers retain their normal antioxidant characteristics in the copolymerized form and are not removed by solvent extraction nor volatilization except under conditions that destroy the polymer. The amine antioxidants, in the copolymerized state, cause comparatively little discoloration on aging and cause no migratory stain while providing antioxidant protection equivalent to high-quality, conventional amine antioxidants.

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