| 摘要 |
A moisture curable composition comprising an acrylate or methacrylate polymer having a silicon functional group capable of causing crosslinking or chain extension by moisture, at least in molecular ends, and being useful particularly as a sealing material and a pressure sensitive adhesive, said polymer being prepared by polymerizing (a) an alkyl acrylate or methacrylate or a monomer mixture of at least 50% by weight of the alkyl acrylate or methacrylate and other unsaturated compounds copolymerizable therewith and (b) 0 to 20 parts of alpha , beta -ethylenically unsaturated organic silicon compound in the presence of (c) 0.01 to 20 parts of a radical polymerization initiator having a group of the general formula: <IMAGE> wherein R3 is a monovalent hydrocarbon group having 1 to 6 carbon atoms, X is a hydrolyzable group and "a" is 0, 1 or 2, and (d) 0 to 20 parts of a chain transfer agent selected from the group consisting of a compound of the general formula: <IMAGE> and a compound of the general formula: <IMAGE> wherein R3, X and "a" are as defined above, and R4 is a bivalent organic group, said parts of (b), (c) and (d) being parts by weight per 100 parts by weight of (a). |
