(PPE) resin composition comprising (a) a PPE and (b) a compound having a 3,4-dihydro-3-substituted-1,3-benzoxazine skeleton or a mixture thereof. A cured PPE composition obtained by curing the PPE composition; And a laminated structure using the curable PPE composition or the cured PPE resin composition. Since the curable PPE composition of the present invention exhibits excellent chemical resistance, moisture resistance, dielectric property, heat resistance, flame retardancy and dimensional stability after curing, the curing PPE composition is excellent in dielectric materials, insulating materials, heat resistance It can be advantageously used as a material or the like. In particular, it can be advantageously used as a resin composition for forming an insulating layer such as the curable single-sided printed substrate, double-sided printed substrate, multilayer printed substrate, flexible printed substrate, semi-rigid substrate and substrate having excellent heat dissipation properties.
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