ACTIVE ENERGY RAY-CURABLE COMPOSITION

摘要

Provided is an active energy ray-curable composition which exhibits good curability by means of an active energy ray, and which has low viscosity, thereby exhibiting excellent coatability in cases where the composition is used as an adhesive, a coating material or the like which is applied to a base and then cured by an active energy ray. In addition, a cured product of this active energy ray-curable composition has excellent flexibility. An active energy ray-curable composition which contains a (meth)acrylic triblock copolymer (A) containing a (meth)acrylic polymer block (aA) having an active energy ray-curable group containing a partial structure represented by general formula (1) and a (meth)acrylic polymer block (bA) having no active energy ray-curable group and a (meth)acrylic diblock copolymer (B) containing a (meth)acrylic polymer block (aB) having an active energy ray-curable group containing a partial structure represented by general formula (1) and a (meth)acrylic polymer block (bB) having no active energy ray-curable group. The ratio of the number average molecular weight Mn(bB) of the (meth)acrylic polymer block (bB) contained in the (meth)acrylic diblock copolymer (B) to the number average molecular weight Mn(bA) of the (meth)acrylic polymer block (bA) contained in the (meth)acrylic triblock copolymer (A), namely Mn(bB)/Mn(bA) is within the range of 0.2-2.0. (In the formula, R1 represents a hydrogen atom or a hydrocarbon group having 1-20 carbon atoms.)