Method of applying adherent coating on copper

Claim 1

A method of adherently bonding a primer coating composition to a surface, at least a portion of the surface being a metal, comprising: removing essentially all soil from the surface, and removing all oxides and oxide films from the surface of the metal to expose a substantially pure metallic surface; dehydrating the surface before the formation of a metallic oxide film greater than about 2.5 nm thick; thereafter applying the primer coating composition to the surface before said metallic oxide film grows to greater than 2.5 nm, said primer coating composition including the product of reacting between 20 to 60% by weight of a poly(vinyl acetal) resin with 80-40% by weight of a thermosetting phenolic resin in the presence of an acidic catalyst, between 0.3 and 2% of a coupling agent having one to three amino substituted aromatic groups covalently bonded to a titanium or zirconium central atom via an oxygen containing linkage and an organic solvent; and heat curing the primer coating composition on the surface at a temperature below 200° C., the cured coating being capable of maintaining the adhesion, essentially without outgassing, for at least 10 seconds when heated at 250° C.

Claim 2

A method of adherently bonding a primer coating composition to a surface, at least a portion of the surface being a metal, comprising: removing essentially all soil from the surface, and removing all oxides and oxide films from the surface of the metal to expose a substantially pure metallic surface; dehydrating the surface before the formation of a metallic oxide film greater than about 2.5 nm thick; thereafter applying the primer coating composition to the surface before said metallic oxide film grows to greater than 2.5 nm, said primer coating composition including the product of reacting between 20 to 60% by weight of a poly(vinyl acetal) resin with 80-40% by weight of a thermosetting phenolic resin in the presence of an acidic catalyst, between 0.3 and 2% of a coupling agent having one to three amino substituted aromatic groups covalently bonded to a titanium or zirconium central atom via an oxygen containing linkage and an organic solvent; and heat curing the primer coating composition on the surface at a temperature below 200° C., the cured coating being capable of maintaining the adhesion, essentially without outgassing, for at least 10 seconds when heated at 250° C.

Claim 9

A method of adherently bonding a primer coating composition to a surface at least a portion of which is copper comprising: cleaning the surface and abrading it with an abrasive and water to expose a clean copper surface; rinsing the surface to remove the abrasive immediately after abrading it; expelling the rinsing solution from the surface and immediately dehydrating the surface by heating to at least about 125° C. and less than about 200° C. for about one minute; thereafter applying the primer coating composition to the surface in less than four hours after abrading the surface, said primer coating composition including the product of reacting between 20 to 60% by weight of a poly-(vinyl acetal) resin with 80-40% by weight of a thermosetting phenolic resin in the presence of an acidic catalyst, between 0.3 and 2% of a coupling agent having one to three amino substituted aromatic groups covalently bonded to a titanium or zirconium central atom via an oxygen containing linkage and an organic solvent; and curing the primer coating composition on the surface at a temperature below 200° C., the cured composition being capable of maintaining the adhesion, essentially without outgassing, for at least 10 seconds when heated at 250° C.

Claim 10

A method of adherently bonding a primer coating composition to a surface at least a portion of which is copper comprising: cleaning the surface and abrading it with an abrasive and water to expose a clean copper surface; rinsing the surface to remove the abrasive immediately after abrading it; expelling the rinsing solution from the surface and immediately dehydrating the surface by heating to at least about 125° C. and less than about 200° C. for about one minute; thereafter applying the primer coating composition to the surface in less than four hours after abrading the surface, said primer coating composition including the product of reacting between 20 to 60% by weight of a poly-(vinyl acetal) resin with 80-40% by weight of a thermosetting phenolic resin in the presence of an acidic catalyst, between 0.3 and 2% of a coupling agent having one to three amino substituted aromatic groups covalently bonded to a titanium or zirconium central atom via an oxygen containing linkage and an organic solvent; and curing the primer coating composition on the surface at a temperature below 200° C., the cured composition being capable of maintaining the adhesion, essentially without outgassing, for at least 10 seconds when heated at 250° C.