Browse Prior Art Database

Hydrophobic Seal for Damaged PC Board Laminate

IP.com Disclosure Number: IPCOM000052227D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Corl, EA: AUTHOR

Abstract

Multilayer printed circuit boards 10 with drilled through holes 12 are subjected to a hydrophobic silane bath to seal the tears and cracks 14 in the walls of the drilled through holes to prevent the wicking of plating solution into the walls along these tears and cracks in the fiber of the board resulting from the drilling.

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Hydrophobic Seal for Damaged PC Board Laminate

Multilayer printed circuit boards 10 with drilled through holes 12 are subjected to a hydrophobic silane bath to seal the tears and cracks 14 in the walls of the drilled through holes to prevent the wicking of plating solution into the walls along these tears and cracks in the fiber of the board resulting from the drilling.

The boards with the holes drilled through them are placed in a chamber and the chamber evacuated. Then, the hydrophobic silane is introduced into the chamber to submerse the boards. When the boards are fully submersed, pressure is applied to force the hydrophobic silane into the interstices in the side wall of the hole. After exposure to the hydrophobic silane, the board is washed to remove the unreacted excess hydrophobic silane and then heated. As a result, one end of the hydrophobic silane molecule bonds with the glass fibers in the printed circuit board while the other end is hydrophobic to reject water. After the heating step, the board may proceed through the plating process. The areas containing the hydrophobic silane will be repulsive to the water-based plating solutions.

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