US4454010A
Expired / Lapsed
US
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Palladium plating procedure
Assignee: Nokia Bell Labs
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Filing: 1982-08-30
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Granted: 1984-06-12
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Expires: 2002-08-30
Abstract
Abstract A palladium electroplating process is described in which a unique compound is used to supply palladium to the electroplating bath. The procedure is particularly useful where a polyamine such as 1,3-diaminopropane is used as the complexing agent for palladium in a palladium electroplating bath. The unique compound is palladium-1,3-diaminopropanedichloride which is highly stable, can be made in pure form, and is readily soluble in water, aqueous solutions, and typical palladium baths.
Inventors
- 👤 Harvey S. Trop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:45
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/50; C25D3/52
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
80 words
A process for electroplating a metallic substance on a surface, said metallic substance comprising palladium, comprising the step of passing current through a cathode, an electroplating bath and an anode with a cathode potential great enough to electroplate palladium, said electroplating bath having a pH between 7.5 and 13.5, a conductivity greater than 10 -3 mho-cm and said electroplating bath comprising a source of palladium characterized in that at least part of the source of palladium is added as palladium-1,3-diaminopropanedichloride.
Claim 2
Dependent Claim
80 words
A process for electroplating a metallic substance on a surface, said metallic substance comprising palladium, comprising the step of passing current through a cathode, an electroplating bath and an anode with a cathode potential great enough to electroplate palladium, said electroplating bath having a pH between 7.5 and 13.5, a conductivity greater than 10 -3 mho-cm and said electroplating bath comprising a source of palladium characterized in that at least part of the source of palladium is added as palladium-1,3-diaminopropanedichloride.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which the palladium-1,3-diaminopropanedichloride is added as a solid.
Claim 4
Dependent Claim
14 words
The process of claim 1 in which the palladium-1,3-diaminopropanedichloride is added as a solution.
Claim 5
Dependent Claim
15 words
The process of claim 1 in which the electroplating bath comprises palladium complexed with ammonia.
Claim 6
Dependent Claim
23 words
The process of claim 1 in which the electroplating bath comprises palladium complexed with at least one aliphatic polyamine with 3-20 carbon atoms.
Claim 7
Dependent Claim
21 words
The process of claim 5 in which the palladium is complexed with at least one aliphatic diamine with 3-10 carbon atoms.
Claim 8
Dependent Claim
13 words
The process of claim 6 in which the palladium is complexed with 1,3-diaminopropane.
Claim 9
Dependent Claim
17 words
The process of claim 5 in which the concentration of palladium is between 0.01 molar and saturation.
Claim 10
Dependent Claim
17 words
The process of claim 8 in which the concentration of palladium is between 0.05 and 1.0 molar.
Claim 11
Dependent Claim
27 words
The process of claim 8 in which the concentration of aliphatic polyamine is between 0.5 times the molar concentration of palladium to the saturation of aliphatic polyamine.
Claim 12
Dependent Claim
24 words
The process of claim 10 in which the molar concentration of aliphatic polyamine is between 2 and 12 times the mole concentration of palladium.
Claim 13
Dependent Claim
20 words
The process of claim 1 in which the temperature of the electroplating bath is between 40 and 60 degrees C.
Claim 14
Dependent Claim
18 words
The process of claim 1 in which the pH of the electroplating solution is between 11.0 and 12.5.
Claim 15
Dependent Claim
13 words
The process of claim 1 in which the electroplating solution comprises a buffer.
Claim 16
Dependent Claim
13 words
The process of claim 14 in which the buffer is a phosphate buffer.
Claim 17
Dependent Claim
16 words
The process of claim 15 in which the buffer concentration is between 0.1 and 2 molar.
Claim 18
Dependent Claim
13 words
The process of claim 16 in which the buffer concentration is 1.0±0.2 molar.
Claim 19
Dependent Claim
25 words
The process of claim 1 in which the palladium-1,3-diaminopropanedichloride is synthesized by reacting palladium chloride with excess 1,3-diaminopropane to form a solution of palladium-1,3-diaminopropane ion.
Claim 20
Dependent Claim
19 words
The process of claim 18 in which said palladium-1,3-diaminopropanedichloride is formed by acidification of the solution of palladium-1,3-diaminopropane ion.
Claim 21
Dependent Claim
39 words
The process of claim 1 in which the palladium-1,3-diaminopropanedichloride is synthesized by adding chloride ion to an aqueous solution of palladium dichloride to form tetrachloropalladium(II) ion in solution and then reacting the tetrachloropalladium(II) ion with 1,3-diaminopropane to form palladium-1,3-diaminopropanedichloride.
Claim 22
Dependent Claim
39 words
The process of claim 1 in which the palladium-1,3-diaminopropanedichloride is synthesized from Pd(NH 3 ) 2 Cl 2 by reacting this compound with 1,3-diaminopropane in an aqueous solution and then acidifying the solution with approximately two equivalents of acid.
Claim 23
Dependent Claim
41 words
The process of claim 1 in which the palladium-1,3-diaminopropanedichloride is synthesized from Pd(NH 3 ) 2 Cl 2 by adding approximately two equivalents of 1,3-diaminopropane to an aqueous solution of Pd(NH 3 ) 2 Cl 2 and the resulting solution acidified.
References Cited (Backward Citations)
US4153523A
Cited
US4278514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |