Curing sealing agent

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PROBLEM TO BE SOLVED : To provide a curable sealant excellent in curing rate and flexibility after curing.SOLUTION : The curable sealant contains : a (meth)acrylic block copolymer (A) comprising a (meth)acrylic polymer block (a) having a curable functional group represented by formula (1) and a (meth)acrylic polymer block (b) having no curable functional group; and a polymerization initiator. (Ris H or a 1-20C hydrocarbon group; Rand Rare each independently H or a 1-6C hydrocarbon group; X is O, S, or N(R); Ris H or a 1-6C hydrocarbon group; and n is an integer of 2-20.)SELECTED DRAWING : None