| 摘要 |
PROBLEM TO BE SOLVED: To obtain an azo-based polymerization initiator readily handleable in use and having high safety. SOLUTION: This polymerization initiator is obtained by dissolving >=25 wt.% of at least one kind of an azo compound selected from 2,2'-azobis(2- methylbutyronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), dimethyl-2,2'-azobis(isobutyrate), dimethyl-2,2'-azobis(2-methylbutyrate) and dimethyl-2,2'-azobis(2,4- dimethylpentanoate) in an organic solvent.
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