US4911799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition of palladium films
Assignee: Nokia of America Corp
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Filing: 1989-08-29
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Granted: 1990-03-27
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Expires: 2009-08-29
Abstract
Abstract A process for electroplating palladium containing deposits from baths comprising a combination of a surfactant and a brightener combination. The surfactant is an alkyl, ammonium-type salt containing 4 to 35 carbon atoms. The brightener is 0-benzaldehydesulfonic acid, 1-naphthalene sulfonic acid, 2-naphthalenesulfonic acid, benzenesulfinic acid, oxy-4,4-bis (benzene) sulfinic acid, p-toluene sulfinic acid, 3-trifluoromethyl benzene sulfinic acid, allyl phenyl sulfone, 0-benzoic sulfamide, benzylsulfonyl propionamide, phenylsulfonyl acetamide, 3-(phenylsulfonyl) propionamide, benzene sulfonamide, bis (phenylsulfonyl) methane, guanidine carbonate, sulfaguanidine or nicotinic acid. This combination provides deposits having superior adhesion and ductility.
Inventors
- 👤 Joseph A. Abys
- 👤 Vijay Chinchankar
- 👤 Virginia T. Eckert
- 👤 Igor V. Kadija
- 👤 Edward J. Kudrak, Jr.
- 👤 Joseph J. Maisano, Jr.
- 👤 Heinrich K. Straschil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:27
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/50; C25D3/52
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
131 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 cathode potential great enough to electroplate palladium, said electroplating bath having a conductivity greater than 10 -3 mho-cm and comprising a source of palladium characterized in that the electroplating bath further comprises a surfactant and a brightener, said surfactant selected from the group consisting of alkyl ammonium chlorides with from 4 to 35 carbon atoms and said brightener selected from the group consisting of o-benzaldehydesulfonic acid, 1-napthalenesulfonic acid, 2-naphthalenesulfonic acid, benzenesulfinic acid, oxy-4,4-bis(benzene)sulfinic acid, p-toluene sulfinic acid, 3-trifluoromethyl benzene sulfinic acid, allyl phenyl sulfone, o-benzoic sulfamide, benzylsulfonyl propionamide, phenylsulfonyl acetamide, 3-(phenylsulfonyl)propionamide, benzene, sulfonamide, bis(phenylsulfonyl)methane, guanidine carbonate, sulfaguanidine and nicotinic acid.
Claim 2
Dependent Claim
131 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 cathode potential great enough to electroplate palladium, said electroplating bath having a conductivity greater than 10 -3 mho-cm and comprising a source of palladium characterized in that the electroplating bath further comprises a surfactant and a brightener, said surfactant selected from the group consisting of alkyl ammonium chlorides with from 4 to 35 carbon atoms and said brightener selected from the group consisting of o-benzaldehydesulfonic acid, 1-napthalenesulfonic acid, 2-naphthalenesulfonic acid, benzenesulfinic acid, oxy-4,4-bis(benzene)sulfinic acid, p-toluene sulfinic acid, 3-trifluoromethyl benzene sulfinic acid, allyl phenyl sulfone, o-benzoic sulfamide, benzylsulfonyl propionamide, phenylsulfonyl acetamide, 3-(phenylsulfonyl)propionamide, benzene, sulfonamide, bis(phenylsulfonyl)methane, guanidine carbonate, sulfaguanidine and nicotinic acid.
Claim 3
Dependent Claim
26 words
The process of claim 1 in which the surfactant is an aliphatic, straight-chain trimethylammonium chloride with chain with chain lengths between 8 and 18 carbon atoms.
Claim 4
Dependent Claim
23 words
The process of claim 2 in which the surfactant is selected from the group consisting of undecyltrimethylammonium chloride, dodecyltrimethylammonium chloride and tridecyltrimethylammonium chloride.
Claim 5
Dependent Claim
12 words
The process of claim 3 in which the surfactant is dodecyltrimethylammonium chloride.
Claim 6
Dependent Claim
17 words
The process of claim 1 in which the concentration of surfactant ranges from 0.0002 to 0.4 molar.
Claim 7
Dependent Claim
24 words
The process of claim 1 in which the brightener is selected from the group consisting of benzenesulfinic acid, 3-trifluoromethylbenzenesulfinic acid and allyl phenyl sulfone.
Claim 8
Dependent Claim
13 words
The process of claim 6 in which the brightener is allyl phenyl sulfone.
Claim 9
Dependent Claim
13 words
The process of claim 7 in which the surfactant is dodecyltrimethyl ammonium chloride.
Claim 10
Dependent Claim
38 words
The process of claim 1 in which the source of palladium comprises a palladium compound selected from the group consisting of PdCl 2 , PdBr 2 , PdI 2 , PdSO 4 and Pd(NO 3 ) 2 .
Claim 11
Dependent Claim
17 words
The process of claim 1 in which the source of palladium is a palladium complex ion compound.
Claim 12
Dependent Claim
24 words
The process of claim 1 in which the source of palladium is a palladium complex ion compound in which the complexing agent is ammonia.
Claim 13
Dependent Claim
17 words
The process of claim 1 in which the electroplating bath has a pH between 6.0 and 13.5.
Claim 14
Dependent Claim
14 words
The process of claim 12 in which the pH is between 6.5 and 8.5.
Claim 15
Dependent Claim
14 words
The process of claim 1 in which the electroplating bath comprises a conducting salt.
Claim 16
Dependent Claim
13 words
The process of claim 14 in which the conducting salt comprises ammonium chloride.
Claim 17
Dependent Claim
13 words
The process of claim 1 in which the electroplating bath comprises a buffer.
Claim 18
Dependent Claim
13 words
The process of claim 16 in which the buffer is a phosphate buffer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |