Composition and method for preparing chemically-resistant roughened copper surfaces for bonding to substrates
View Patent ↗The invention is directed to a method and composition for providing chemically-resistant roughened copper surfaces suitable for subsequent multilayer lamination. In one embodiment, a smooth copper surface is contacted with an adhesion promoting composition under conditions effective to provide a roughened copper surface, the adhesion promoting composition comprising an oxidizer, a pH adjuster, a topography modifier, and a sulfur-containing coating stabilizer. In another embodiment, a smooth copper surface is contacted with an adhesion promoting composition under conditions effective to provide a roughened copper surface, the adhesion promoting composition comprising an oxidizer, a pH adjuster, and a topography modifier. Then, in a subsequent step, the roughened copper surface is contacted with an acid resistance promoting composition.
1. A process for preparing roughened copper surfaces suitable for subsequent multilayer lamination, said process comprising the steps of:
contacting with a copper surface an adhesion promoting composition under conditions effective to provide a roughened copper surface, said adhesion promoting composition comprising an oxidizer, a pH adjuster, and a topography modifier;
contacting said roughened copper surface with an acid resistance promoting composition selected from the group consisting of sodium dioctyldithiocarbamate, disodium trithiocarbonate, sodium sulfide, sodium N,N-dibutyldithiocarbamate and sodium hydroquinone monomethyl ether xanthate; and
contacting said roughened copper surface with a post-dip solution, said post-dip solution comprising an azole or silane.
2. The process according to claim 1 , wherein said post-dip solution comprises a silane selected from among trichlorosilanes and trimethoxysilanes.
3. The process according to claim 1 , wherein said post-dip solution comprises a silane selected from the group consisting of trimethoxy-silylpropyldiethylenetriamine; 3-methylacryloyloxypropyltrimethoxysilane; styrylmethyl-2aminoethylamino) propyltrimethoxysilane hydrochloride; 3-(N-allyl-2-aminoethylamino)-propyltrimethoxysilane hydrochloride; N-(styrylmethyl)-3-aminopropyltrimethoxysilane hydrochloride; N-2-aminoethyl-3-aminopropyltrimethoxysilane; 3-(N-Benzyl-2-aminoethylamino)-propyltri-methoxy silane hydrochloride; beta-(3,4-epoxycyclohexyl) ethyltrimethoxysilane; gamma-aminopropyl-triethoxy silane; gamma-glycidoxypropyltrimethoxysilane; and vinyltrimethoxysilane.
4. The process according to claim 1 , wherein said post-dip solution further comprises a titanate.
5. The process according to claim 4 , wherein said titanate is selected from the group consisting of titanate amine; tetraocytl di(ditridecyl)phosphito titanate; tetra(2,2-diallyloxymethyl) butyl-di(ditridecyl)phosphito titanate; neopentyl(diallyl)oxytri(diocytl)pryo-phosphato titante; and neopentyl(diallyl)oxy tri(m-amino)phenyl titanate.
6. The process according to claim 1 , wherein said post-dip solution further comprises a zirconate.
7. The process according to claim 6 , wherein said zirconate is selected from the group consisting of KZ 55-tetra (2,2 diallyloxymethyl)butyl, di(ditridecyl)phosphito zirconate; NZ-01-neopentyl(diallyl)oxy, trineodecanoyl zirconate; NZ-09-neopentyl(diallyl)oxy, tri (dodecyl)benzene-sulfonyl zirconate; tetra(2,2 diallyloxymethyl)butyl-di(ditridecyl)phosphito zirconate; and zirconium IV 2,2-dimethyl 1,3-propanediol.
8. The process according to claim 1 , wherein said post-dip solution further comprises an aluminate.
9. The process according to claim 8 , wherein said aluminate is selected from the group consisting of diisobutyl(oleyl)acetoacetylaluminate and diisopropyl(oleyl)acetoacetyl aluminate.
10. The process according to claim 1 , wherein said adhesion promoting composition further comprises a copper salt.
11. The process according to claim 10 , wherein said copper salt is copper sulfate.