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The copolymerization of butadiene and styrene in an alkanesulfonic acid emulsion with air as the oxidizing agent and higher alkanesulfinic acids as oil‐soluble reducing agents has been studied. Dodecyl mercaptan and ferric salts are needed to make this recipe function well. The optimum pH for rapid polymerization was found to vary with the different alkanesulfinic acids (C8 to C18 in the even‐numbered straight‐chain series). Tetradecanesulfinic acid is the most active reducing activator in this series. The conversions with butadiene and styrene are about 75–80% at 30° in six hours and these copolymers have normal solubility and inherent viscosities.

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