Other

Macdermid, Incorporated

Donna M Kologe

Gary B Larson

Steven A Castaldi

Raymond A Letize

Ernest Long

Brian Larson

Carl P Steinecker

Colleen Mckirryher

Cynthia Retallick

Lenora M Toscano

Austin Wells

Paul Romaine

A method for enhancing the solderability of a metallic surface is disclosed where the metallic surface is plated with a silver plate prior to soldering, which immersion silver plate is treated with an additive comprising a mercapto substituted or thio substituted silane compound. Preferred post treatments comprise 3-mercapto propyl trimethoxysilane and/or 3-oxtanoylthio-1-propyltriethoxy silane.

Method for enhancing the solderability of a surface

A method of stripping silver from a printed circuit board without attacking the underlying base metal. The stripping solution comprises an oxidizing agent, an alkaline pH adjuster, and a silver solubilizing agent. After the silver has been sufficiently removed from the surface of the printed circuit board, the printed circuit board is contacted with a neutralization solution to remove any smut remaining on the surface. The silver stripping solution does not contain cyanide or chromium and does not require the use of anodic current.

Method of stripping silver from a printed circuit board

The present invention relates to a process for the manufacture of printed circuit boards. The method contemplates a novel processing sequence for this manufacturing process which method is particularly versatile in reducing the number of steps and variety of chemicals currently necessary to produce the circuit boards.

Process for the manufacture of printed circuit boards

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Thomaston, CT, United States of America

Donna M Kologe