| abstract |
An aqueous solution for alkaline stripping of metallic surfaces having a resist coating on at least a portion of the surface thereof, the resist coating normally being based upon polyvinyl chloride, such as polyvinyl chloride contained in a base emulsion for a photo resist material. The alkaline stripper solution is based upon a mixture of potassium hydroxide and ammonium hydroxide, together with a chelating agent consisting of the sodium salts of ethylenediaminetetraacetic acid, acetic acid, and ethylene glycol monobutyl ether. |