Abstract: Provided are a (meth)acrylic block copolymer exhibiting good active energy ray curability, in particular, curability of a blend thereof with an acrylate monomer, and an active energy ray curable composition comprising the (meth)acrylic block copolymer. The (meth)acrylic block copolymer includes a methacrylic polymer block (A) having an active energy ray curable group including a partial structure represented by the general formula (1) below wherein R1 denotes a hydrocarbon group having 1 to 10 carbon atoms, and W denotes a saturated hydrocarbon group having 1 to 10 carbon atoms, and an acrylic polymer block (B) having no active energy ray curable groups.

Abstract: To provide a conjugated diene graft polymer having high transparency, heat resistance and weather resistance, and a method for producing the conjugated diene graft polymer. A method for producing a conjugated diene graft polymer in which a side chain (b) including a polymer including at least one monomer unit selected from the group consisting of a conjugated diene unit and an aromatic vinyl compound unit is bonded to a main chain (a) including a polymer including a conjugated diene unit, via a hetero atom Z serving as a branching point and having a valence of not less than 3, the method including a step of reacting a specific active end polymer and a specific functional group-modified conjugated diene polymer having a functional group in a side chain to thereby produce a conjugated diene graft polymer; and a step of recovering the conjugated diene graft polymer obtained.

Abstract: Provided are a (meth)acrylic block copolymer exhibiting good active energy ray curability, in particular, curability of a blend thereof with an acrylate monomer, and an active energy ray curable composition comprising the (meth)acrylic block copolymer. The (meth)acrylic block copolymer includes a methacrylic polymer block (A) having an active energy ray curable group including a partial structure represented by the general formula (1) below wherein R1 denotes a hydrocarbon group having 1 to 10 carbon atoms, and W denotes a saturated hydrocarbon group having 1 to 10 carbon atoms, and an acrylic polymer block (B) having no active energy ray curable groups.

Abstract: The invention provides a (meth)acrylic block copolymer that exhibits a high curing rate when irradiated with active energy rays and also has a low viscosity. The (meth)acrylic block copolymer includes a methacrylic polymer block (a1) and a methacrylic polymer block (a2) that each have an active energy ray curable group including a partial structure (1) of the following general formula (1), and further includes an acrylic polymer block (B) that has no active energy ray curable groups and is present between the methacrylic polymer block (a1) and the methacrylic polymer block (a2). The content of monomer units derived from methyl methacrylate relative to all monomer units in the methacrylic polymer block (a1) and the methacrylic polymer block (a2) is not less than 30 mass %. The content of monomer units derived from an alkyl acrylate ester having an alkyl group with 6 or more carbon atoms relative to all monomer units in the acrylic polymer block (B) is not less than 40 mass %.