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US4673472A
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Method and electroplating solution for deposition of palladium or alloys thereof
Assignee: TECHNIC Inc A CORP OF RHODE ISLAND
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Filing: 1986-02-28
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Granted: 1987-06-16
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Expires: 2006-02-28
Abstract
Abstract Electroplating solutions for the deposition of palladium or the alloys thereof, in which solutions palladium was added in the form of the reaction product of palladium diaminodinitrite with an acid in the presence of a scavenging agent for nitrous acid.
Inventors
- 👤 Ronald J. Morrissey
- 👤 Harry Kroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:52
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/50; C25D3/52; C25D3/56; C25D3/567
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
62 words
An electroplating solution for the deposition of palladium or of alloys thereof, having a pH between about 1.5 and 4.0, and containing palladium in the form of a reaction product formed from palladium diaminodinitrite with an acid in the presence of a scavenging agent for nitrite, said acid being selected from the group consisting of sulfamic, sulfuric, methane sulfonic, fluoroboric and nitric.
Claim 2
Dependent Claim
62 words
An electroplating solution for the deposition of palladium or of alloys thereof, having a pH between about 1.5 and 4.0, and containing palladium in the form of a reaction product formed from palladium diaminodinitrite with an acid in the presence of a scavenging agent for nitrite, said acid being selected from the group consisting of sulfamic, sulfuric, methane sulfonic, fluoroboric and nitric.
Claim 3
Dependent Claim
21 words
The electroplating solution of claim 1 containing palladium in the form of the reaction product of palladium diaminodinitrite with sulfamic acid.
Claim 4
Dependent Claim
21 words
The electroplating solution of claim 1 containing palladium in the form of the reaction product of palladium diaminodinitrite with sulfuric acid.
Claim 5
Dependent Claim
21 words
The electroplating solution of claim 1 containing at least one nitrogen-containing heterocyclic organic brightener whereby a bright electrodeposit can be obtained.
Claim 6
Dependent Claim
46 words
The electroplating solution of claim 4 wherein the nitrogen-containing heterocyclic organic brightener is selected from the group consisting of succinimide, maleimide, pyridine, pyridine 3-sulfonic acid, 3-pyridine acetic acid, nicotinic acid, nicotinamide, nicotinyl alcohol, pyridinium ethyl sulfobetaine, pyridinium propyl sulfobetaine, pyridinium butyl sulfobetaine, piperidine, piperazine, and pyrazine.
Claim 7
Dependent Claim
26 words
The electroplating solution of claim 1 containing a soluble compound of a palladium alloying metal selected from the group consisting of silver, nickel, ruthenium and platinum.
Claim 8
Dependent Claim
27 words
The electroplating solution of claim 6 wherein the soluble compound is silver sulfamate, silver nitrate, silver carbonate, silver methane sulfonate, silver fluoborate, or a silver disuccinimide complex.
Claim 9
Dependent Claim
8 words
The electroplating solution of claim 7 containing succinimide.
Claim 10
Dependent Claim
42 words
The electroplating solution of claim 7 containing at least one sulfur-containing compound selected from the group consisting of thioacetic acid, thioglycolic acid, thiolactic acid, thiomalic acid, thiourea, imidazolidine thione, s-sulfopropyl thiourea, 2-mercaptobenzothiazole, 2-mercaptobenzothiazole s-propyl sulfonate, potassium ethylxanthate, and potassium ethylxanthate s-propyl sulfonate.
Claim 11
Dependent Claim
28 words
The electroplating solution of claim 6 wherein the soluble compound is selected from the group consisting of nickel carbonate, nickel chloride, nickel sulfate, nickel sulfamate, and nickel fluoborate.
Claim 12
Dependent Claim
21 words
The electroplating solution of claim 10 containing at least one nitrogen-containing heterocyclic organic brightener whereby a bright electrodeposit can be obtained.
Claim 13
Dependent Claim
39 words
The electroplating solution of claim 10, containing at least one sulfur-containing organic compound selected from the group consisting of saccharin, the potassium, sodium and ammonium salts of saccharin, and the potassium, sodium and ammonium salts of allyl sulfonic acid.
Claim 14
Dependent Claim
33 words
The electroplating solution of claim 6 wherein the added soluble compound is a potassium, sodium or ammonium salt of the complex anion [Ru 2 NCl 8 (H 2 O) 2 ] -3 .
Claim 15
Dependent Claim
21 words
The electroplating solution of claim 13 containing at least one nitrogen-containing heterocyclic organic brightener whereby a bright electrodeposit can be obtained.
Claim 16
Dependent Claim
30 words
The electroplating solution of claim 6 wherein the soluble compound is selected from the group consisting of diglycine platinum (II) chloride, bis(beta-alanine) platinum (II) chloride, and bis(dl-alanine) platinum (II) chloride.
Claim 17
Dependent Claim
21 words
The electroplating solution of claim 15 containing at least one nitrogen-containing heterocyclic organic brightener whereby a bright electrodeposit can be obtained.
Claim 18
Independent Claim
69 words
The method of electroplating a palladium deposit on a substrate employing a palladium-containing electrolyte, the improvement which comprises said electrolyte containing palladium in the form of a reaction product formed from palladium diaminodinitrite with an acid selected from the group consisting of sulfamic, sulfuric, methane sulfonic, fluoroboric and nitric in the presence of a scavenging agent for nitrite, and said electrolyte having a pH of about 1.5 to 4.0.
Claim 19
Independent Claim
69 words
The method of electroplating a palladium deposit on a substrate employing a palladium-containing electrolyte, the improvement which comprises said electrolyte containing palladium in the form of a reaction product formed from palladium diaminodinitrite with an acid selected from the group consisting of sulfamic, sulfuric, methane sulfonic, fluoroboric and nitric in the presence of a scavenging agent for nitrite, and said electrolyte having a pH of about 1.5 to 4.0.
Claim 20
Dependent Claim
13 words
The method of claim 17 wherein said pH is about 2 to 3.5.
Claim 21
Dependent Claim
16 words
The method of claim 17 wherein said electrolyte contains a soluble compound of a palladium-alloying metal.
Claim 22
Dependent Claim
15 words
The method of claim 19 wherein said palladium-alloying metal is silver, nickel, ruthenium of platinum.
Claim 23
Dependent Claim
11 words
The method of claim 17 wherein said scavenging agent is urea.
Claim 24
Dependent Claim
17 words
The method of claim 17 wherein said scavenging agent is urea and said acid is sulfamic acid.
References Cited (Backward Citations)
JPS4733178Y1
Cited
US4478692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |