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Sensitization of Plastic Surfaces

IP.com Disclosure Number: IPCOM000079073D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Marshall, JH: AUTHOR

Abstract

A solution of combined chemical etchant and sensitization ingredients sensitizes a parylene C surface for electroless plating and simultaneously smooths out undesired nodules and roughness.

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Sensitization of Plastic Surfaces

A solution of combined chemical etchant and sensitization ingredients sensitizes a parylene C surface for electroless plating and simultaneously smooths out undesired nodules and roughness.

Tie etchant solution is Joclin-Jetarc "Fluoro Bond" Etchant for TEFLON* manufactured by Quantum, Inc. To each 100ML of etchant solution, 0.5 grams of purified palladium chloride is added. The mixture is stirred thoroughly for one- half hour in a covered beaker. Upon dissolution of the palladium chloride, the color of the solution changes from black to grey green.

The object surface to be sensitized is immersed in the etchant-sensitizer solution for 1 to 5 minutes, removed, rinsed with nN-butyl alcohol or isopropyl alcohol, rinsed in distilled water, and either dried by blown air or immersed directly into the electroless plating solution. Prior treatment of the object surface, such as preconditioning, is not required. Heat or an inert atmosphere (nitrogen) will hasten the sensitization reaction.

The object surface comprises a coating layer-of parylene C formed over a silane coated quartz base. The adhesion promoting silane layer has roughness which invariably translates Into the overcoating. This roughness is apparently smoothed by the action of the etchant-sensitizer.

The etchant-sensitizer will also smooth and sensitize epoxy, TEFLON and polypropylene surfaces. Other etchant systems are useful to form the etchant- sensitizer; e.g., proprietar...