| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simple method of producing a novel vinyl ether-based ABA-type triblock copolymer comprising a polyvinyl ether-based polymer and a polyoxystyrene-based polymer. Ž<P>SOLUTION: The method of producing the vinyl ether-based ABA-type triblock copolymer is for obtaining an ABA-type triblock copolymer in which a polyvinyl ether-based polymer is a center block by adding a mixture of an oxystyrene-based monomer and a vinyl ether-based monomer to a difunctional polymerization initiator, a Lewis acid and a solvent and by subjecting the resultant mixture to a living cation polymerization under such a condition that the reaction rate constant ratio between the reaction rate constant k<SB>OS</SB>of the oxystyrene-based monomer and the reaction rate constant k<SB>VE</SB>of the vinyl ether-based monomer becomes k<SB>VE</SB>/k<SB>OS</SB>≥1,650. By this method, a vinyl ether-based ABA-type triblock copolymer can be simply and efficiently produced. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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