| 摘要 |
PROBLEM TO BE SOLVED: To control the side reaction of the polymerization growth terminal in polymerization to thereby produce an isobutylene polymer exhibiting an excellent performance. SOLUTION: A monomer component containing isobutylene is subjected to cationic polymerization in the presence of a polymerization initiator, a catalyst, an ether and an electron donor. Alternatively, a monomer component containing isobutylene is subjected to cationic polymerization in the presence of a polymerization initiator, a catalyst, an ether and an electron donor, and a compound having a carbon-carbon unsaturated bond is then added to introduce a carbon-carbon unsaturated bond into the terminal of the polymer.
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