| http://www.w3.org/ns/prov#value | - As the insulating binder used in this invention, various kinds of resins sensitized by a Lewis acid are suitable and examples of such resins are an epoxy resin, a phenoxy resin, a phenol-formaldehyde resin, polycarbonate, polystyrene, polysulfone, polyphenylene oxide, polyethylene terephthalate, a mixture thereof or a copolymer thereof.
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