Demetallizing procedure

Details Demetallizing procedure Demetallizing procedure

1992-01-31

1994-08-23

Dang, Thi

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156642, 156665, B05D 500

Patent

active

053404360

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 of aqueous etchant, particularly hot aqueous sodium hydroxide solution, for a time at least sufficient to 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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"Aluminum Anodizer Regenerates Caustic Etch Solution" in Plating and Surface Finishing, Apr. 1984 by Dejat.

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