Aroyl disulfides as promoter‐modifiers for copolymerization of butadiene and styrene

Benzoyl, anisoyl, veratroyl, p ‐bromobenzoyl, p ‐phenylbenzoyl, p ‐benzoylbenzoyl, p ‐methylsulfonylbenzoyl, p ( N , N ‐dimethylsulfonamido)‐benzoyl and ‐naphthoyl disulfides are promoters of the emulsion copolymerization of butadiene and styrene, but exhibit little effect on the polymer properties. Furoyl, phenyl, p ‐chlorophenyl and p ‐bromophenyl disulfides are neither promoters nor modifiers.