Compositions for the removal of silicone conformal coatings from a printed circuit board
AssigneeNuGeneration Technologies, LLC
InventorsDonato Polignone, Stephen Utschig-Samuels
Life of this patent
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Abstract
A solvent composition has an oxygenated solvent and a siloxane solvent. In one embodiment, the oxygenated solvent is propylene glycol methyl ether and the siloxane solvent is hexamethyldisiloxane or octamethyltrisiloxane. In another embodiment, the solvent composition is an azeotrope of propylene glycol n-butyl ether and decamethyltetrasiloxane. The siloxane solvent can be used in any situation where one desires to remove a silicone deposit, e.g., conformal coatings, adhesives, sealants, greases, heat transfer fluids, paints, oils, etc.
Claims11
A method of removing a silicone conformal coating from a printed circuit board, comprising:
- A) providing a solvent composition including an oxygenated solvent and a siloxane solvent;
- B) providing a printed circuit board (PCB) including a first electrical component mounted to the PCB and a silicone conformal coating deposited over the PCB and first electrical component;
- C) removing only a portion of the silicone conformal coating over the first electrical component by using the solvent composition to dissolve the portion of the silicone conformal coating;
- D) replacing the first electrical component with a second electrical component after removing the portion of the silicone conformal coating;
- and
- E) replacing the portion of the silicone conformal coating with a second silicone conformal coating.
Dependencies are inferred from the claim text.