Single step pre-swelling and etching of plastics for plating
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United States of America Patent
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Sep 17, 1991
Issued Date -
N/A
app pub date -
Mar 6, 1990
filing date -
Nov 7, 1988
priority date (Note) -
Expired
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Abstract
A one-step process for treating polymer surfaces prior to electroless deposition is disclosed. Polymer parts are dipped in a solution containing a good solvent for the polymer, a substantial non-solvent for the polymer, an etchant and, where one of these is immiscible with one or more of the others, a solubilizing agent miscible with the immiscible components to provide a single liquid phase. Formulations are provided for pre-swelling and etching of functionalized polymers, such as polycarbonate in one, two and three steps. The etched surface can then be plated with electroless nickel or copper with satisfactory adhesion of the plated metals. Swelling agents make polymer molecules on and near the surface of the polymer easily accessible to a degradation agent. A degradation agent degradates the polymer molecules. If required, a solubilizing agent increases the miscibility of the degradation agent and the swelling agent. A wetting agent increases the effectiveness of the etching agent.
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