Claims
- 1. A clear solution for sensitizing a surface to the deposition of adherent electroless metal, said solution consisting essentially of a liquid medium and the reaction product of admixing and heating A, D, E and G, wherein:
- A is an ion of a precious metal selected from those of the fifth and sixth periods of Groups VIII and IB of the Periodic Table of Elements:
- D is an ion of a Group IV metal of the Periodic Table of Elements which is capable of two valence states;
- E is an anion capable of forming a stable complex with components A and D; and
- G is a hydroxyl group-containing aromatic organic compound capable of forming a stable, soluble complex with the precious metal ion A or the Group IV metal ion D;
- said admixing comprising the steps:
- 1. forming a first solution comprising A and E and a second solution comprising D and E, with at least one of said solutions also comprising G; and
- 2. adding said first solution to said second solution.
- 2. A sensitizer solution as defined in claim 1, wherein the concentration of component A is from 0.001 to 5 g./l. and the solution contains a sufficient excess of unreacted components D and E to provide a stable solution.
- 3. A sensitizer solution as defined in claim 2, wherein there is an excess of unreacted component G.
- 4. A sensitizer solution as defined in claim 1 wherein the concentration of component A is from 0.2 to 2 g./l., component D is from 15 to 60 g./l., component E is from 5 to 20 g./l. and component G is from 1.0 to 25 g./l.
- 5. A sensitizer solution as defined in claim 1 wherein component A is palladium ion.
- 6. A sensitizer solution as defined in claim 1 wherein component A is platinum ion.
- 7. A sensitizer solution as defined in claim 1 wherein component D is stannous ion.
- 8. A sensitizer solution as defined in claim 1 wherein component E is an anion of the group consisting of Cl.sup.-, SnCl.sub.3 .sup.-, and mixtures thereof.
- 9. A sensitizer solution as defined in claim 1 wherein component G is a compound of the group consisting of resorcinol, catechol, hydroquinone, anthraquinone phenol, phloroglucinol and mixtures thereof.
- 10. A sensitizer solution as defined in claim 9 wherein component G is resorcinol.
- 11. A sensitizer solution as defined in claim 1 wherein said liquid medium is of the group consisting of water, an oxygen-containing organic compound and mmixtures thereof.
- 12. A sensitizer solution as defined in claim 11 wherein said liquid medium is of the group consisting of water, methanol and cyclohexanone.
- 13. A sensitizer solution as defined in claim 1 in which component A is palladium ion, component D is stannous ion, component E is an anion of the group consisting of Cl.sup.-, SnCl.sub.3 .sup.- and mixtures thereof, and component G is resorcinol.
- 14. A dilutable concentrate for a sensitizer solution as defined in claim 1 which contains a soluble complex, the components of which are at a concentration of 4 to 10 g./l. of palladium ion, from 400 to 600 g./l. of stannous tin ion, from 150 to 400 g./l. of chloride ion and from 25 g./l. to the saturation concentration of a hydroxyl group-containing aromatic compound of the group consisting of resorcinol, catechol, hydroquinone, anthraquinone, phenol, phloroglucinol and mixture thereof.
- 15. A dilutable concentrate for a sensitizer solution according to claim 14 wherein said hydroxyl group-containing aromatic organic compound is resorcinol.
- 16. A sensitizer solution as defined in claim 1 which also includes a small effective amount of a fluorinated hydrocarbon wetting agent.
- 17. A process for preparing a sensitizer solution as defined in claim 1 wherein a solution of the components A, E and G is mixed with a solution of the components D and E and the resulting mixture is heated.
- 18. A process for preparing a sensitizer solution as defined in claim 1 wherein a solution of the components A, E and G is mixed with a solution of the components, D, E and G and the resulting mixture is heated.
- 19. A process for preparing a sensitizer solution as defined in claim 25 wherein a solution of the components A and E is mixed with a solution of the components D, E and G and the resulting mixture is heated.
- 20. A process as defined claim 17 wherein the reactants are heated at a temperature of from about 65.degree.C. to about the boiling point of said mixture.
- 21. A process as defined in claim 18 wherein the reactants are heated at a temperature of from about 65.degree.C. to about the boiling point of said mixture.
- 22. A process as defined in claim 19 wherein the reactants are heated at a temperature of from about 65.degree.C. to about the boiling point of said mixture.
- 23. A process for sensitizing a substrate to be plated with an adherent electroless metal which comprises contacting the substrate with a sensitizing solution as defined in claim 1.
- 24. A clear solution for sensitizing a surface to the deposition of adherent electroless metal, said solution consisting essentially of water and the reaction product of admixing and heating palladium ions, stannous ions, chloride ions and resorcinol, wherein said admixing comprises the steps:
- 1. forming a first solution comprises palladium ions and chloride ions and a second solution comprising stannous ions and chloride ions, with at least one of said solutions also comprising resorcinol; and
- 2. adding said first solution to said second solution.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of our copending application, Ser. No. 384,691 filed on Aug. 1, 1973, now abandoned.
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
384691 |
Aug 1973 |
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