Patent ID: 7211625
Filing Date: 2007-05-01
Classification: C08F,C08L

Abstract:
1. A composition comprising the following two components (A) and (B): (A) a block copolymer comprising a methacrylic ester polymer block and an acrylic ester polymer block, the block copolymer being formed by radical polymerization in the presence of a thiocarbonylthio group-containing compound, the thiocarbonylthio group-containing compound being 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 of nitrogen, oxygen, sulfur, halogen, silicon, phosphorus, and metal atoms, and which may be a polymer; Z 1 is a hydrogen atom, halogen atom, or monovalent organic group of 1 or more carbon atoms which may contain one of nitrogen, oxygen, sulfur, halogen, silicon, and phosphorus atoms, and which may be a polymer; 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), and 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 of nitrogen, oxygen, sulfur, halogen, silicon, phosphorus, and metal atoms, and which may be a polymer; Z 2 is an oxygen atom (when q=2), sulfur atom (when q=2), nitrogen atom (when q=3), or q-valent organic group of 1 or more carbon atoms which may contain one of nitrogen, oxygen, sulfur, halogen, silicon, and phosphorus atoms, and which may be a polymer; plural R 2 's may be the same or different; and q is an integer of 2 or more); and (B) at least one resin or rubber selected from the group consisting of thermoplastic resins, acrylic polymer rubbers, olefinic polymer rubbers, diene polymer rubbers, and natural rubber, wherein the component (A) is a methacrylic ester-acrylic ester-methacrylic ester block copolymer produced by a process, the process comprising the steps of: radically polymerizing monomers containing a methacrylic ester monomer as a principal constituent in the presence of at least one thiocarbonylthio group-containing compound, thiocarbonylthio group-containing compound being selected from the group consisting of the compounds represented by general formulae (1) and (2); adding monomers containing an acrylic ester monomer as a principal constituent to the mixture and further performing radical polymerization to produce thiocarbonylthio group-containing methacrylic ester-acrylic ester block copolymers; converting the thiocarbonylthio groups of the copolymers into mercapto groups or mercaptide groups; and coupling the copolymers by using the mercapto groups or the mercaptide groups.