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US 4,059,574 AGranted
Symmetric azo-bis-mercapto compounds
AssigneeRohm Co., Ltd.
InventorsOtto Hitzler, Horst Pennewiss, August Froelich, Gerhard Markert, Winfried Wunderlich
Life of this patent
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Abstract
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.
Claims4
A symmetric azo-bis-mercapto compound of the formula ##STR7## 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.
Dependencies are inferred from the claim text.