PURPOSE: To obtain a moisture-curable composition which can give a bubble-free thick film even in an environment of a high humidity, by mixing a specified polyfunctional compound with a ketimine group-containing compound prepared from a polyamine and a ketone.

CONSTITUTION: A composition comprising a polyfunctional compound (A) having at least two (meth)acryloyl groups in the molecule and a ketimine group- containing compound (B) prepared from a polyamine and a ketone. Examples of polyfunctional compound (A) which van be desirably used include polyol polyacrylate and polyester polyacrylate. Examples of compound (B) include ketimine group-containing compounds obtained by a dehydration reaction of an aliphatic diamine, an alicyclic polyamine or the like with a ketone. The ratio of polyfunctional compound (A) to compound (B) is such that the equivalent ratio of the (meth)acryloyl groups to the ketimine groups is usually in the range of 1:0.2W1:1.5.