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US4059574A Symmetric azo-bis-mercapto compounds 失效
对称偶氮双巯基化合物

Symmetric azo-bis-mercapto compounds
摘要:
Symmetric azo-bis-mercapto compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 are methyl or ethyl, R.sub.3 and R.sub.4 are the same or different alkylene having 1 to 4 carbon atoms, and n is 0 or 1, and a method for forming block copolymers of vinyl monomers in a two-step process employing such compounds as polymerization initiators.
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