Patent ID: 7399801

Claim:
A curable composition comprising: a polymer (A) having at least one mercapto group at the molecular ends, the polymer (A) being derived from a thiocarbonylthio group-containing polymer (a2) prepared by polymerizing a monomer (a1) which contains an acrylic ester as a principal component and which contains 50% by weight or more of the acrylic ester and less than 50% by weight of a monomer copolymerizable with the acrylic ester in the presence of a thiocarbonylthio group-containing compound, wherein the thiocarbonylthio group-containing compound is at least one compound selected from the group consisting of a compound represented by general formula (1): wherein R 1 is a p-valent organic group of 1 or more carbon atoms which may contain one or more of nitrogen, oxygen, sulfur, halogen, silicon, phosphorus, and metal atoms; Z 1 is a hydrogen atom, halogen atom, or monovalent organic group of 1 or more carbon atoms which may contain one or more of nitrogen, oxygen, sulfur, halogen, silicon, and phosphorus atoms; wherein is different from R 1 ; when plural Z 1 s are present, the plural Z 1 s may be the same or different; and p is an integer of 1 or more, a compound represented by general formula (2): wherein R 2 is a monovalent organic group of 1 or more carbon atoms which may contain one or more of nitrogen, oxygen, sulfur, halogen, silicon, phosphorus, and metal atoms; Z 2 is a sulfur atom when q=2, an oxygen atom when q=2, a nitrogen atom when q=3, or q-valent organic group of 1 or more carbon atoms which may contain one or more of nitrogen, oxygen, sulfur, halogen, silicon, and phosphorus atoms; plural R 2 s may be the same or different; and q is an integer of 2 or more, and a compound represented by general formula (3): wherein R 3 is a divalent organic group of 1 or more carbon atoms which may contain one or more of nitrogen, oxygen, sulfur, halogen, silicon, phosphorus, and metal atoms; each Z 1 is a hydrogen atom, halogen atom, or monovalent organic group of 1 or more carbon atoms which may contain one or more of nitrogen, oxygen, sulfur, halogen, silicon, and phosphorus atoms; and the two Z 1 s may be the same or different, wherein the molecular weight distribution of the mercapto group-containing polymer (A) is 1.8 or less, the molecular weight distribution being determined by gel permeation chromatography; a compound (B), wherein compound (B) is different from polymer (A); having at least two mercapto groups per molecule; and an oxidizing agent (C).