Macroazo compounds, which comprise a repeating unit composed of a moietyof the formula (a), a moiety of the formula (b) and a moiety of the formula(c)wherein X, E, Z and T are independently a lower alkylene group, R1, R2, R3 andR4 areindependently a lower alkyl group or a cyano group, R5, R6, R7 and R8 areindependentlya lower alkyl group or an aryl group, and m and n are independently a positiveinteger,those moieties being bound with one another through a carboxylic acid esterlinkage or acarboxylic acid amido linkage, make it possible, for instance, in a case ofusing thecompound as a polymerization initiator, to produce easily and at highefficiency a blockpolymer containing both polyorganosiloxane units and polyoxyalkylene units initsmolecule.
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