| 摘要 |
<p>A process for polymer production which comprises subjecting a (meth)acrylic acid monomer, etc. to atomic-transfer radical polymerization and replacing a terminal halogen group of the resultant polymer with a carboxylic acid type group, e.g., a carboxylate group. The replacement reaction can be accelerate d by conducting the reaction using as a catalyst a transition metal complex having as the central metal an element in Group 7, 8, 9, 10, or 11 of the Periodic Table in the presence of a nitrogenous compound. As a compound havi ng the carboxylic acid type group, use is made of a polymer, a polymer having a carboxylic acid type group in a side chain, a compound having two or more carboxylic acid type groups, etc. Examples of the polymer to be obtained by this reaction include a graft polymer, a gel, a coupled polymer, and a terminal-functional polymer, especially, a polymer having a carboxylic acid type group at an end. A vinyl polymer which has a carboxyl group at an end o f the main chain and in which the content of the terminal carboxyl group is hi gh can be easily obtained. A curable composition comprising the vinyl polymer gives a cured article excellent in properties such as rubber elasticity.</SD OAB></p> |
