Method for producing block copolymer, and block copolymer obtained using same

The present invention provides a method for producing a block copolymer by reacting α-methylstyrene with a growing end of a polymer block (A) derived from styrene, or a derivative thereof, which is obtained by living anionic polymerization of styrene or a derivative thereof (excluding α-methylstyrene) in the presence of a polymerization initiator, the reaction being carried out in a micro-reactor provided with channel in which a plurality of liquids can be mixed. As a result of the reaction, obtained is an intermediate polymer in which a polymer unit (B) derived from α-methylstyrene is bonded to one terminal of the polymer block (A), and then a (meth)acrylate compound (c) is subjected to living anionic polymerization in the presence of a polymerization initiator by using the polymer unit (B) derived from α-methylstyrene contained in the intermediate polymer as a growing end, thereby forming a polymer block (C) derived from the (meth)acrylate compound (c).