Patent ID: 7521124

Claim:
A method comprising: (1) applying a composition over an electronic circuit board, and (2) curing the composition to produce a sealed circuit board; where the composition is prepared by mixing components comprising: (I) a polyorganosiloxane having an average of at least two unsaturated organic groups per molecule, with the proviso that component (I) is free of fluorine atoms; optionally (II) an organohydrogenpolysiloxane having an average of at least two silicon-bonded hydrogen atoms per molecule, with the proviso that component (II) is free of fluorine atoms; (III) a hydrosilylation catalyst; (IV) a fluoroorganosilicone, with the provisos that (1) component (IV) has at least one functional group reactive with component (I), component (II), or both, (2) when component (II) is not present, then component (IV) has an average of at least two silicon-bonded hydrogen atoms per molecule, and (3) component (IV) is added to the composition in an amount sufficient to provide chemical resistance to a cured product of the composition; and (V) an adhesion promoter comprising a reaction product of a hydroxy-terminated polyorganosiloxane with an epoxy-functional alkoxysilane or an unsaturated alkoxysilane, or a physical blend of a hydroxy-terminated polyorganosiloxane with an epoxy-functional alkoxysilane or an unsaturated alkoxysilane, with the proviso that component (IV) and component (V) are added to the composition in amounts sufficient to provide resistance to Bleed to the composition.