Non-hardening solvent removable hydrophobic conformal coatings

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29841, 29846, 106 1434, 106 1438, 106 1445, 427 96, 427154, 427155, 428201, 428203, 428901, B32B 104

Patent

active

052327582

ABSTRACT:
A non-hardening, solvent removable hydrophobic conformal coating is provided for electronic devices, such as printed circuit boards. The coating material comprises a metal alkyl benzyl sulfonate, together with a carrier and a solvent. The metal alkyl benzyl sulfonate may include compounds such as calcium eicosanylbenzyl sulfonate. The carrier may be any oxidized hydrocarbon, such as lauryl ethanoxylate, for example, and the solvent may be any low boiling aliphatic hydrocarbon. Though the coating is impervious to water, it may be readily and selectively removed using a small quantity of a non-polar organic solvent, such as mineral spirits or terpenes. Thus, although the electronic device is protected from corrosion, electromigration and physical harm by the coating, the coating may be easily, quickly and selectively removed in the event a component needs replacement, repair or adjustment.

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Eisenmann, "Removable Encapsulation for Modules or Cards", IBM Tech. Disc. Bull., vol. 13, No. 8 (Jan. 1971), p. 2459.

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