Isoprene → Isoprene acrylonitrile

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Then, were added thereto 68.2 parts of isoprene and 3.70 parts of methyl α-chlorophenyl acetate as an organic halide, and stirred under heating at 80° C. After 130 hours, the same post-treatment as in Example 1 was carried out to give a random (isoprene/acrylonitrile) copolymer. The conversion rate of isoprene was 88% and the conversion rate of acrylonitrile was 85%. The analysis results of the random (isoprene/acrylonitrile) polymer obtained are shown in Table 3. The polymer was confirmed to have a chlorine atom at the terminal of the polymer chain.

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