Browse Prior Art Database

Self Banking Etchants

IP.com Disclosure Number: IPCOM000090873D
Original Publication Date: 1969-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Sybalsky, J: AUTHOR

Abstract

Addition of dichromate ions to an acid etch bath containing chloride ions permits etching of metals with steepened, i.e., more sharply banked, edge profiles improve image transfer definition and quality. Example 1 is an etchant bath for etching copper and copper alloys with the edge-banking effect. Example 2 is a similar etchant with self-banking properties, for etching copper, copper alloys, iron, iron alloys, and nickel. Example 1. Chromium Trioxide 480 gm Hydrochloric Acid, Concentrated 100 ml Water 1 liter Example 2. Ferric Chloride 387 gm Chromium Trioxide 20 gm Hydrochloric Acid, Concentrated 10 ml Water 1 liter.

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Self Banking Etchants

Addition of dichromate ions to an acid etch bath containing chloride ions permits etching of metals with steepened, i.e., more sharply banked, edge profiles improve image transfer definition and quality. Example 1 is an etchant bath for etching copper and copper alloys with the edge-banking effect. Example 2 is a similar etchant with self-banking properties, for etching copper, copper alloys, iron, iron alloys, and nickel. Example 1. Chromium Trioxide 480 gm Hydrochloric Acid, Concentrated 100 ml Water 1 liter Example 2. Ferric Chloride 387 gm Chromium Trioxide 20 gm Hydrochloric Acid, Concentrated 10 ml Water 1 liter.

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