| abstract |
(57) [Problem] To provide a method for producing a block copolymer excellent in productivity and quality. SOLUTION: When producing a block copolymer of a methacrylic polymer block-acrylic polymer block by controlled radical polymerization, an organic bromide or a sulfonyl bromide compound is used as an initiator, and copper contained in copper bromide is used. Polymerization of an acrylic polymer block is performed using a metal complex having a central metal as a catalyst, and when the conversion is 80 to 95%, a methacrylic polymer and a metal complex having copper as a central metal contained in copper chloride are formed. And polymerize. |