Demetallizing procedure

Details Demetallizing procedure Demetallizing procedure

1995-06-06

1997-05-13

Dang, Thi

Etching a substrate: processes

Nongaseous phase etching of substrate

Relative movement between the substrate and a confined pool...

216102, B05D 500

Patent

active

056289219

ABSTRACT:
Selective demetallization of an etchable metal layer supported on a polymeric material or other microwave transparent material, or a self-supporting etchable metal layer, particularly aluminum of thickness at least about 1 micron adhesively joined to a flexible polymeric material substrate, is described. A web of polymeric material bearing the etchable metal layer, or an unsupported etchable metal layer, has a pattern of etchant-resistant material first applied and then the web is immersed in and passed through a bath aqueous etchant, particularly hot aqueous sodium hydroxide solution, for a time at least sufficient completely remove the etchable metal from non-protected areas of the web. The demetallized web is washed and dried. Specific structure incorporating the selectively demetallized etchable metal layer also are described.

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