PROCESS FOR PRODUCING THERMOPLASTIC ELASTOMER, AND THERMOPLASTIC ELASTOMER

摘要

When producing a copolymer of a block (a) comprising an alkylstyrene and an isoolefin as main components and a block (b) comprising an aromatic vinyl monomer as a main component, it has been impossible in conventional techniques to inexpensively and stably produce, with simple equipment, a thermoplastic elastomer in which units of the alkylstyrene have been randomly introduced into the isoolefin polymer and which can retain excellent mechanical strength. The above-mentioned problem is solved by using a specific compound as a polymerization initiator and keeping the amount of the unreacted alkylstyrene present during the polymerization for producing the block (a) at up to 1/90 the total amount of the isoolefinic monomers.