Patent Number: 7,732,549

Title: Multi-branched polymer

Abstract: 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): ##STR00001## wherein R.sub.1 to R.sub.3 each independently represents hydrogen or a hydrocarbon group, R.sub.1 may be bonded to R.sub.3 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.

Inventors: Aoyagi; Koichiro (Chiyoda-ku, JP), Niitani; Takeshi (Ichihara, JP)

Assignee: Nippon Soda Co., Ltd.

International Classification: C08F 4/06 (20060101); C08F 12/16 (20060101); C08F 20/22 (20060101)

Expiration Date: 2022-06-08 0:00:00