Styrene → 1,2-Diethenylbenzene

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Still further, in a nitrogen atmosphere, 213 m mole as active lithium of sec-butyllithium was added to a 15 wt.% n-hexane solution of 9.5 kg of a monomer mixture comprising 1,3-butadiene and styrene in a weight ratio of 40:60, and the mixture was polymerized at 60° C. for 4 hours. After more than 99% of the monomers had been polymerized, the resulting active copolymer solution was further mixed with a 20 wt.% n-hexane solution of 19.0 kg of a monomer mixture comprising 1,3-butadiene and styrene in a weight ratio of 70:30, and the mixture was polymerized first at 70° C. for 4 hours and then at 85° C. for one hour. After substantially all of the monomer mixture had been copolymerized, the resulting final copolymer was inactivated by addition of a small amount of water. To the copolymer solution, 285 g of phenyl-β-naphthylamine was added. Thereafter, n-hexane was volatilized to obtain a non-divinylbenzene-incorporated thermoplastic elastomer in accordance with the present process (sample H), and the physical properties thereof were measured.

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