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AssigneeFurukawa Circuit Foil Co., Ltd.
InventorsYasuhisa Yoshihara, Hisao Kimijima
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An electromagnetic shielding copper foil superior in electromagnetic shielding ability, high in transmittance, and free from particle shedding comprising a copper foil on at least one surface of which a fine roughening particle layer of copper or an alloy is provided and having on the fine roughening particle layer a smoothening layer comprised of cobalt, nickel, indium, or an alloy of the same and an electromagnetic shield able to be suitably used for a PDP using the same. The fine roughening particle layer may also be a layer comprised of a fine particle roughening particle layer of copper on which a fine roughening particle layer of a copper alloy is stacked or may also be formed by a copper-cobalt-nickel alloy. The smoothening layer of the copper foil may be treated for stainproof or by a silane coupling agent to protect the surface of the copper foil.
An electromagnetic shielding copper foil comprising a copper foil or a copper alloy foil on at least one surface of which a fine roughening particle layer comprising fine roughening particles is provided.
An electromagnetic shielding copper foil comprising a copper foil or a copper alloy foil on at least one surface of which is provided a fine roughening particle layer on which a smoothening layer comprising one of the group of metals of cobalt, nickel, indium and alloys of the same is provided.
A method of production of an electromagnetic shielding copper foil comprising providing on a least one surface of a copper foil or a copper alloy foil a first fine roughening particle layer comprising one of the group of metals of copper, a copper-cobalt alloy, a cobalt-nickel alloy and a copper-cobalt-nickel alloy, providing on said first fine roughening particle layer a second fine roughening particle layer comprising one of the group of metals of a copper-cobalt alloy, a cobalt-nickel alloy and a copper-cobalt-nickel alloy, and providing on said second fine roughening particle layer a smoothening layer comprising one of the group of metals of cobalt, nickel, indium and alloys of the same.
Dependencies are inferred from the claim text.