| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a block copolymer with a low residual solvent concentration by preliminarily controlling the solvent concentration in a crumb before dehydration and drying, and separating out the crumb having a shape from which the residual solvent is easily vaporized and removed even by a conventional drying treatment, in a method of manufacturing a block copolymer comprising a vinyl aromatic hydrocarbon and a conjugated diene by obtaining a crumb by a steam stripping method, then dehydrating and drying it. SOLUTION: In this manufacturing method, a hydrocarbon solvent solution of a block copolymer having a polymer concentration within 10-60 wt.% is stripped with steam under a specific condition (inlet point of the polymer solution, temperature and pressure in the separating-out vessel, etc.). COPYRIGHT: (C)2004,JPO
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