| http://www.w3.org/ns/prov#value | - According to the present invention, suitable materials for forming the protective layer 15 coating the surface of the barrier layer or the surface of the surface finishing layer are resins including epoxy resins, phenolic resins, melamine resins, alkyd resins, polyimide resins, unsaturated polyester resins, polyurethane resins, unsaturated carboxylic acid graft polyolefin resins, polyester copolym
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