Abstract: The present invention relates to a curable composition that includes an oxyalkylene polymer A having an average of 4 to 8 terminal groups per molecule and having a reactive silicon group represented by: —SiXaR3-a (1) (in which R is a monovalent organic group having 1 to 20 carbon atoms and represents an organic group other than a hydrolyzable group, and X represents a halogen atom, a hydroxyl group, or a hydrolyzable group; a is an integer from 1 to 3; when a is 2 or more, X groups may be the same as or different from each other, and when a is 1, R groups may be the same as or different from each other), wherein the terminal group has the reactive silicon group, an unsaturated group, an isocyanate group or an active hydrogen-containing group, and the oxyalkylene polymer A has a hydroxyl group equivalent molecular weight of 500 to 1,750 per terminal group.

Abstract: The present invention relates to a curable composition that includes an oxyalkylene polymer A having an average of 4 to 8 terminal groups per molecule and having a reactive silicon group represented by: —SiXaR3-a (1) (in which R is a monovalent organic group having 1 to 20 carbon atoms and represents an organic group other than a hydrolyzable group, and X represents a halogen atom, a hydroxyl group, or a hydrolyzable group; a is an integer from 1 to 3; when a is 2 or more, X groups may be the same as or different from each other, and when a is 1, R groups may be the same as or different from each other), wherein the terminal group has the reactive silicon group, an unsaturated group, an isocyanate group or an active hydrogen-containing group, and the oxyalkylene polymer A has a hydroxyl group equivalent molecular weight of 500 to 1,750 per terminal group.

Abstract: The present invention relates to an oxyalkylene polymer including: a polyoxyalkylene chain containing an oxyethylene group; and a reactive silicon group which is bonded to the polyoxyalkylene chain via an organic group containing one group represented by —C(?O)NH—, wherein a number average molecular weight is from 3,000 to 150,000, a molecular weight distribution is 2.00 or less, an amount of the oxyethylene group is from 3 to 90% by mass, and the number of the reactive silicon groups per molecule is 0.5 or more.

Abstract: The curable composition is a curable composition containing an oxyalkylene polymer A having a reactive silicon group represented by —SiRa(X)3-a, wherein the oxyalkylene polymer A has 6 or more terminal groups per molecule; the terminal group contains at least one selected from the group consisting of a reactive silicon group represented by —SiRa(X)3-a, an active hydrogen-containing group, and an unsaturated group; the oxyalkylene polymer A has 0.3 or more reactive silicon groups per terminal group; and the number average molecular weight of the oxyalkylene polymer A is more than 25,000 and not more than 100,000.