Patent US4299670A successfully refreshed from Google Patents.
US4299670A
Expired / Lapsed
US
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Palladium plating procedure and bath
Assignee: AT&T Inc
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Filing: 1980-09-22
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Granted: 1981-11-10
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Expires: 2000-09-22
Abstract
Abstract A process for electrodepositing palladium. The article to be coated is exposed to a benzotriazole compound for preventing interference by copper ions in the plating bath. The article may be exposed either by a predip in a solution comprising a benzotriazole compound or the compound may be included in the electroplating bath.
Inventors
- 👤 Joseph Yahalom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:23
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34; C25D3/00; C25D3/02; C25D3/50; C25D3/52; H; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/244
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
109 words
A process for plating palladium onto a surface from an aqueous ammoniacal plating bath comprising a source of palladium for electroplating, said source of palladium comprising a palladium amine complexing ion, said process comprising the step of passing current through cathode, plating bath and anode characterized in that the surface is exposed to a solution comprising at least one benzotriazole compound selected from the group consisting of benzotriazole and substituted benzotriazole with substituents in at least one of the 4, 5, 6 and 7 positions of the benzene ring, said substituents selected from the group consisting of hydrocarbons with up to 5 carbon atoms, chlorine, bromine and nitrate groups.
Claim 2
Dependent Claim
109 words
A process for plating palladium onto a surface from an aqueous ammoniacal plating bath comprising a source of palladium for electroplating, said source of palladium comprising a palladium amine complexing ion, said process comprising the step of passing current through cathode, plating bath and anode characterized in that the surface is exposed to a solution comprising at least one benzotriazole compound selected from the group consisting of benzotriazole and substituted benzotriazole with substituents in at least one of the 4, 5, 6 and 7 positions of the benzene ring, said substituents selected from the group consisting of hydrocarbons with up to 5 carbon atoms, chlorine, bromine and nitrate groups.
Claim 3
Dependent Claim
23 words
The process of claim 1 in which the benzotriazole compound is selected from the group consisting of benzotriazole, 5-methylbenzotriazole, 5-chlorobenzotriazole, 5-bromobenzotriazole and 5-nitrobenzotriazole.
Claim 4
Dependent Claim
22 words
The process of claim 1 in which the concentration of the benzotriazole compound in the solution is between 0.1 mg/l and saturation.
Claim 5
Dependent Claim
20 words
The process of claim 3 in which the concentration of the benzotriazole compound is between 2 mg/l and 20 mg/l.
Claim 6
Dependent Claim
15 words
The process of claim 1 in which the benzotriazole compound is contained in the bath.
Claim 7
Dependent Claim
25 words
The process of claim 1 in which the palladium amine complexing ion has a concentration (in terms of palladium metal) between one mg/l and saturation.
Claim 8
Dependent Claim
16 words
The process of claim 6 in which the palladium concentration is between 10 g/l and saturation.
Claim 9
Dependent Claim
16 words
The process of claim 7 in which the palladium concentration is between 50 g/l and saturation.
Claim 10
Dependent Claim
14 words
The process of claim 1 in which the pH is between 7 and 12.
Claim 11
Dependent Claim
14 words
The process of claim 9 in which the pH is between 8 and 10.
Claim 12
Dependent Claim
11 words
The process of claim 10 in which the pH is 9±0.2.
Claim 13
Dependent Claim
14 words
The process of claim 11 in which the plating bath further comprises conducting salts.
Claim 14
Dependent Claim
30 words
The process of claim 12 in which the conducting salts are selected from the group consisting of ammonium chloride, ammonium phosphate, ammonium sulfamate, ammonium formate, ammonium sulfate, and ammonium carbonate.
Claim 15
Dependent Claim
64 words
The process of claim 1 in which the palladium amine complexing ion is added as a palladium amine compound selected from the group consisting of Pd(NH 3 ) 2 (NO 2 ) 2 , Pd(NH 3 ) 4 (NO 3 ) 2 , Pd(NH 3 ) 2 Cl 2 , Pd(NH 3 ) 4 Br 2 and Pd(NH 3 ) 4 Cl 2 .
Claim 16
Dependent Claim
35 words
The process of claim 14 in which the plating bath consists essentially of 80 g/l palladium metal added as Pd(NH 3 ) 4 Cl 2 , 20 mg/l 5-methylbenzotriazole and sufficient aqueous ammonia to pH=9±0.2.
Claim 17
Dependent Claim
83 words
An aqueous palladium electroplating bath comprising a source of palladium for electroplating, said source of palladium comprising a palladium amine complexing ion, and aqueous ammonia characterized in that the palladium electroplating bath further comprises at least one benzotriazole compound selected from the group consisting of benzotriazole and substituted benzotriazole with substituents in the 4, 5, 6 and 7 positions of the benzene ring, said substituents selected from the group consisting of hydrocarbons with up to 5 carbon atoms, chlorine, bromine and nitrate groups.
Claim 18
Dependent Claim
83 words
An aqueous palladium electroplating bath comprising a source of palladium for electroplating, said source of palladium comprising a palladium amine complexing ion, and aqueous ammonia characterized in that the palladium electroplating bath further comprises at least one benzotriazole compound selected from the group consisting of benzotriazole and substituted benzotriazole with substituents in the 4, 5, 6 and 7 positions of the benzene ring, said substituents selected from the group consisting of hydrocarbons with up to 5 carbon atoms, chlorine, bromine and nitrate groups.
Claim 19
Dependent Claim
21 words
The palladium electroplating bath of claim 16 in which the substituent is an alkyl group with up to 5 carbon atoms.
Claim 20
Dependent Claim
25 words
The palladium electroplating bath of claim 17 in which the benzotriazole compound is selected from the group consisting of benzotriazole, 5-methylbenzotriazole, 5-chlorobenzotriazole, 5-bromobenzotriazole and 5-nitrobenzotriazole.
Claim 21
Dependent Claim
25 words
The palladium plating bath of claim 16 in which the concentration of the benzotriazole compound in the plating bath is between 0.1 mg/l and saturation.
Claim 22
Dependent Claim
22 words
The palladium plating bath of claim 19 in which the concentration of the benzotriazole compound is between 2 mg/l and 20 mg/l.
Claim 23
Dependent Claim
27 words
The palladium plating bath of claim 20 in which the palladium amine complexing ion has a concentration (in terms of palladium metal) between one mg/l and saturation.
Claim 24
Dependent Claim
18 words
The palladium plating bath of claim 21 in which the palladium concentration is between 10 g/l and saturation.
Claim 25
Dependent Claim
18 words
The palladium plating bath of claim 22 in which the palladium concentration is between 50 g/l and saturation.
Claim 26
Dependent Claim
16 words
The palladium plating bath of claim 16 in which the pH is between 7 and 12.
Claim 27
Dependent Claim
16 words
The palladium plating bath of claim 24 in which the pH is between 8 and 10.
Claim 28
Dependent Claim
13 words
The palladium plating bath of claim 25 in which the pH is 9±0.2.
Claim 29
Dependent Claim
16 words
The palladium plating bath of claim 26 in which the plating bath further comprises conducting salts.
Claim 30
Dependent Claim
29 words
The palladium plating bath of claim 27 in which the conducting salts are selected from the group consisting of ammonium phosphate, ammonium sulfamate, ammonium formate, ammonium sulfate, ammonium carbonate.
Claim 31
Dependent Claim
65 words
The palladium plating bath of claim 16 in which the palladium amine complexing ion added as a palladium amine compound selected from the group consisting of Pd(NH 3 ) 2 (NO 2 ) 2 , Pd(NH 3 ) 4 (NO 3 ) 2 , Pd(NH 3 ) 2 Cl 2 , Pd(NH 3 ) 4 Br 2 and Pd(NH 3 ) 4 Cl 2 .
Claim 32
Dependent Claim
37 words
The palladium plating bath of claim 29 in which the plating bath consists essentially of 80 g/l palladium metal added as Pd(NH 3 ) 4 Cl 2 , 20 mg/l 6-methylbenzotriazole and sufficient aqueous ammonia to pH=9±0.2.
Claim 33
Dependent Claim
19 words
The palladium bath of claim 16 in which the source of palladium is supplied with a solid palladium compound.
Claim 34
Dependent Claim
19 words
The palladium bath of claim 16 in which the benzotriazole compound is supplied in the form of a solid.
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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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |