| abstract |
(57) [Summary] [PROBLEMS] To be able to introduce a mercapto group at the terminal of a polymer with a high yield, to control the mercapto group introduction rate to the polymer and the terminal functionalization rate of the polymer, It is an object of the present invention to provide a simple method for controlling the molecular weight and the molecular weight distribution, and to provide a simple method for producing a polymer having a mercapto group at a terminal, which is excellent in heat resistance, light resistance, and weather resistance. . SOLUTION: An unsaturated monomer is subjected to radical polymerization in the presence of a compound having a thiocarbonylthio structure selected from the general formulas (1) and (2), and the resulting polymer is converted into a hindered amine light stabilizer. By treating with a hindered amine compound such as (HALS), a polymer having a mercapto group at a terminal is produced. |