Demetallizing procedure

Details Demetallizing procedure Demetallizing procedure

1992-01-07

1993-11-30

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428457, 428901, 428201, 428202, B32B 902

Patent

active

052663868

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.

REFERENCES:
patent: 4329396 (1982-05-01), Kropp
patent: 4555414 (1985-11-01), Hoover
patent: 5108822 (1992-04-01), Imaichi

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