The aim of the present invention is to provide a multi-branched polymer, in which branch terminals can be easily modified and which have a high degree of branching and narrow dispersion. By polymerizing a compound having 2 or more polymerization-initiation sites and polymerizable unsaturated bonds with a living radical polymerization method using a metal catalyst, it is possible to produce a multi-branched polymer with narrow dispersion and a high degree of branching and having repeating units represented by the formula (I):
wherein R1 to R3 each independently represents hydrogen or a hydrocarbon group, R1 may be bonded to R3 to form a ring; X represents a connecting group having a valence of 3 or higher; Y may be the same or different and each represents a functional group which may have a halogen atom at a terminal thereof; and a is an integer of 2 or larger.
本发明的目的是提供一种多支化聚合物,其支化末端易于改性,支化程度高且分散范围窄。通过使用
金属催化剂,用活自由基聚合法聚合具有 2 个或 2 个以上聚合引发位点和可聚合不饱和键的化合物,可以生产出一种具有窄分散性和高支化度的多支化聚合物,其重复单元由式(I)表示:
其中 R1 至 R3 各自独立地代表氢或烃基,R1 可与 R3 键合形成环;X 代表价数为 3 或更高的连接基团;Y 可以相同或不同,各自代表可在其末端带有卤素原子的官能团;a 为 2 或更大的整数。