Abstract:
The present invention is related to a composition for micro etching of a copper or a copper alloy surface, wherein the composition comprises i) at least a source of Fe 3+ ions, ii) at least a source of Br - ions, iii) at least an inorganic acid, and iv) at least one etch refiner according to formula (I) wherein R1 is selected from the group consisting of hydrogen, C 1 -C 5 -alkyl or a substituted aryl or alkaryl group; R2 is selected from the group consisting of hydrogen, C 1 -C 5 -alkyl or C 1 -C 5 -alkoxy; R3, R4 are selected from the group consisting of hydrogen and C 1 -C 5 -alkyl; and X- is a suitable anion. Further, the present invention is directed to a method for micro etching of copper or copper alloy surfaces using such a composition.
Abstract:
A method for manufacturing a printed circuit board, comprising in this order the steps (i) providing a non-conductive substrate having on at least one surface - a coper circuitry with a copper surface, wherein the copper surface is - chemically treated by (a) an oxidation and subsequent reduction reaction and/or (b) an organic compound attached to the copper surface, - a permanent, non-conductive, not fully polymerized cover layer covering at least partially said copper surface, (ii) thermally treating the substrate with the permanent, non-conductive, not fully polymerized cover layer at a temperature in the range from 40°C to 250°C in an atmosphere, which contains molecular oxygen in an amount of 100000 ppm or less, based on the total volume of the atmosphere, such that a substrate with a permanent, non-conductive cover layer is obtained, the cover layer being more polymerized compared to step (i), with the proviso: - that step (ii) is carried out after step (i) but before any metal or metal alloy is deposited onto the permanent, non-conductive, not fully polymerized cover layer, and - that in step (ii) the permanent, non-conductive, not fully polymerized cover layer is fully polymerized in solely one single thermal treating step, if the cover layer is a solder mask.
Abstract:
The present invention relates to a method for increasing adhesion strength between a surface of copper or copper alloy and an organic layer, the method comprising in this order the steps: (i) providing a non-conductive substrate comprising on at least one side said surface, said surface having a total surface area of copper or copper alloy, (ii) contacting said substrate comprising said surface with an acidic aqueous non- etching protector solution comprising (ii-a) one or more than one amino azole, (ii-b) one or more than one organic acid and/or salts thereof, (ii-c) one or more than one peroxide in a total amount of 0.4 wt-% or less, based on the total weight of the protector solution, and (ii-d) inorganic acids in a total amount of 0 to 0.01 wt-%, based on the total weight of the protector solution, wherein during step (ii) the total surface area of said surface is not increased upon contacting with the protector solution.
Abstract:
The present invention relates to a specific azole silane compound, an oligomer thereof, a mixture comprising said compound and/or said oligomer, as well as a respective storage and working solution. Furthermore, the present invention relates to a synthesis method for said specific azole silane compound, and the use of said working solution as a sur- face treatment solution.