Demetallizing procedure
AssigneeBeckett Industries Inc.
InventorD. Gregory Beckett
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Abstract
Selective demetallization of an etchable metal film supported on a polymeric material or other microwave transparent material, particularly an etchable metal film, particularly aluminum, of thickness at least about 1 micron adhesively joined to a flexible polymeric material substrate, is described. A web of metallized polymeric material 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.
Claims4
A novel laminate structure, comprising:
- a flexible polymeric substrate layer resistant to aqueous sodium hydroxide solution etchant,
- a layer of adhesive coextensive with said substrate resistant to aqueous sodium hydroxide solution etchant,
- a layer of an etchable metal comprising aluminum having a thickness of about 1 to about 15 microns overlying said adhesive layer in a pattern,
- a layer of aqueous sodium hydroxide solution etchant-resistant material overlying said etchable metal layer in the same pattern as said etchable metal layer, and
- a layer of detackifying material overlying said adhesive layer in regions thereof not overlied by said etchable metal layer.
Dependencies are inferred from the claim text.