Abstract: Provided is a curable composition that, while reducing a used amount of (meth)acrylic acid ester monomers having a large number of carbon atoms, yields a cured product which has both good transparency and good elongation. The curable composition contains (A) a silyl group-containing (meth)acrylic-based polymer, (B) a silyl group-containing polyoxyalkylene-based polymer having a number average molecular weight of 20,000 or more, and (C) an aromatic ring-containing plasticizer. Units derived from CH2?C(R1)(COOR2), where R1 is a hydrogen atom or a methyl group, and R2 is a group having nine or more carbon atoms, account for 5% by weight or less of all structural units of (A). The curable composition contains 60 parts by weight or more of (C) with respect to 100 total parts by weight of (A) and (B), and a cured product has a haze of 55 or less, the haze being obtained through a curing test.

Abstract: An organic polymer, having a number-average molecular weight of 800 to 15,000, and comprising 0.5 or more but less than 1.2 reactive silicon groups in each molecule of the polymer on average, in which the reactive silicon groups are introduced into one-side out of terminals thereof, and heightening, in particular, the proportion of molecules (of the polymer) into each of which the silicon group is introduced.

Abstract: An organic polymer, having a number-average molecular weight of 800 to 15,000, and comprising 0.5 or more but less than 1.2 reactive silicon groups in each molecule of the polymer on average, in which the reactive silicon groups are introduced into one-side out of terminals thereof, and heightening, in particular, the proportion of molecules (of the polymer) into each of which the silicon group is introduced.