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Abstract

An aromatic vinyl compound-aromatic polyene copolymer satisfies the following conditions: the copolymer has a number average molecular weight of between 500 and 100000; the aromatic vinyl compound monomer has between 8 and 20 carbon atoms, and the content of aromatic vinyl compound monomer units is more than 70 mass %; the aromatic polyene is selected from polyenes having between 5 and 20 carbon atoms and having a plurality of vinyl and/or vinylene groups in the molecule, and the content of the vinyl and/or vinylene groups derived from aromatic polyene units is 2 pieces or more and less than 30 pieces per number average molecular weight; one or more selected from olefin monomer units having between 2 and 20 carbon atoms may be included, wherein a total amount of the aromatic vinyl compound monomer units, the aromatic polyene monomer units, and the olefin monomer units, if present, is 100 mass %.

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First Claim