Metal foil-based layered product and process for producing the same
AssigneeNitto Denko Corporation
InventorsToshiyuki Kawashima, Nobuharu Tahara, Kenichi Ikeda
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Abstract
A metal foil-based layered product which can eliminate the problems caused by etchant infiltration, can be produced easily, and is sufficiently effective in reducing the permittivity of the whole insulating layer; and a process for producing the same. The process for producing the metal foil-based layered product includes the steps of: forming on a metal foil an undercoat film layer made of a poly(amic acid) which has been imidized at least partly; forming a porous precursor layer on the undercoat film layer by a wet film-forming method using a solution containing a poly(amic acid); and imidizing at least the porous precursor layer.
Claims6
A metal foil-based layered product comprising a metal foil and a porous resin layer formed on the metal foil through a resin film layer, the resin film layer having a thickness of from 0.1 to 15 μm.
A process for producing a metal foil-based layered product which comprises the steps of:
- forming on a metal foil an undercoat film layer comprising a poly(amic acid) which has been imidized at least partly;
- forming a porous precursor layer on the undercoat film layer by a wet film-forming method using a solution containing a poly(amic acid);
- and imidizing at least the porous precursor layer.
Dependencies are inferred from the claim text.