Method and composition for protecting an electronic circuit board from contamination and corrosion
AssigneeForesite, Inc.
InventorTerry L. Munson
Life of this patent
Estimating the term…
Abstract
A method for protecting an electronic circuit board by covering the board with a composition comprising rosin and a carrier and allowing the composition to dry. The coating may be provided by spraying over all or selected parts of an assembled board, or as an underfill by microdispensing under one or more components. The rosin-containing composition may include 20% to 95% rosin and 5% to 80% of a carrier, although 30% to 80% rosin and 20% to 70% carrier, or even 30% to 50% rosin and 50% to 70% carrier, may be more preferred. The carrier may be an alcohol, such as isopropyl alcohol, and should be free of flux activators.
Claims20
A method for protecting an assembled circuit board, comprising applying a rosin-containing composition comprising rosin and a carrier to components assembled on a board and subsequently allowing the composition to dry.
The method of claim I wherein the rosin-containing composition is applied as a protective coating over all parts on the surface of an assembled board.
The method of claim 5 wherein the rosin-containing composition is applied by microdispensing.
The method of claim I wherein said carrier comprises an alcohol.
A method for protecting an assembled circuit board, comprising applying a rosin-containing composition consisting essentially of rosin and a carrier to components assembled on a board and subsequently allowing the composition to dry.
A composition effective for protecting an electronic circuit board from corrosion, the composition comprising 20% to 95% rosin and 5% to 80% of a carrier in a formulation effective for coating and protecting an electronic circuit board from corrosion.
Dependencies are inferred from the claim text.