US3926749A
Expired / Lapsed
US
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Tin-lead alloy plating
Assignee: M&T HARSHAW
•
Filing: 1975-01-16
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Granted: 1975-12-16
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Expires: 1995-01-16
Abstract
Abstract This invention relates to the electrodeposition of tin-lead alloys; tin-lead alloy plating compositions, tin-lead alloy plating baths; and to processes for the electrodeposition of tinlead alloys in the presence of at least one polyether surfactant and at least one aryl hydroxy (-OH) compound as cooperating additives.
Inventors
- 👤 Frank Passal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:08
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/60; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3473
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
22 words
The process of claim 1 wherein said aryl hydroxy (-OH) compound is selected from the group consisting of naphthols and substituted phenols.
Claim 2
Dependent Claim
14 words
The process of claim 2 wherein said aryl hydroxy (-OH) compound is Beta -naphthol.
Claim 3
Dependent Claim
14 words
The process of claim 2 wherein said aryl hydroxy (-OH) compound is 2,4,6 trichlorophenol.
Claim 4
Dependent Claim
14 words
The process of claim 2 wherein said aryl hydroxy (-OH) compound is p,p'' dihydroxdiphenylsulfone.
Claim 5
Dependent Claim
13 words
The process of claim 2 wherein said aryl hydroxy (-OH) compound is 2,7-naphthalenediol.
Claim 6
Dependent Claim
13 words
The process of claim 2 wherein said aryl hydroxy (-OH) compound is 1,1''-bi-2-naphthol.
Claim 7
Dependent Claim
14 words
The process of claim 2 wherein said aryl hydroxy (-OH) compound is Alpha -naphthol.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein said tin-lead alloy is substantially 60% tin and 40% lead.
Claim 9
Dependent Claim
22 words
The process of claim 6 wherein said polyether surfactant is a nonylphenol-ethylene oxide condensate exhibiting about fifteen ethylene oxide groups per molecule.
Claim 10
Dependent Claim
13 words
The process of claim 1 wherein said polyether surfactant is of the formula:
Claim 11
Dependent Claim
16 words
The process of claim 1 wherein the water soluble alkoxylated wetting agent is of the formula:
Claim 12
Dependent Claim
24 words
The process of claim 1 wherein the water soluble stannous tin salt is stannous fluoborate and the waTer soluble lead salt is lead fluoborate.
Claim 13
Dependent Claim
109 words
A process for electrodepositing white, continuous, fine-grained tin-lead alloy electrodeposits which comprises passing current from an anode to a cathode through an aqueous acidic bath composition consisting essentially of: a. 4 grams per liter to 53 grams per liter of stannous tin; b. 1 gram per liter to 85 grams per liter of lead; c. 100 grams per liter to 200 grams per liter of free fluoboric acid; d. 4 grams per liter to 10 grams per liter of a polyether surfactant; and e. 0.5 grams per liter to 1.0 gram per liter of an aryl hydroxy (-OH) compound selected from the group consisting of naphthols and substituted phenols.
Claim 14
Dependent Claim
101 words
A COMPOSITION FOR PROVIDING WHITE, CONTINUOUS, FINEGRAINED TIN-LEAD ALLOY ELECTRODEPOSITS WHICH COMPRISES AN AQUEOUS ACIDIC BATH COMPOSITION CONSISTING OF AT LEAST ONE WATER SOLUBLE STANNOUS TIN SALT, AT EAST ONE WATER SOLUBLE LEAD SALT PROVIDING ABOUT 1.0 GRM PER LITER TO 85.0 GRAMS PER OF LEAD AND CONTAINING AS COOPERATING ADDITIVES 4 GRAMS PER LITER TO 12 GRAMS PER LITER OF AT LEAST ONE POLYETHER SURFACTANT AND 0.5 GRAM PER LITER TO 1.0 GRAM PER LITER OF AT LEAST ONE QRYL HYDROXY (-OH) COMPOUND SELECTED FROM THE GROUP CONSISTING OF NAPHTHOLS AND SUBSTITUTED PHENOLS, IN THE ABSENCE OF OTHER BRIGHTENING AGENTS.
Claim 15
Dependent Claim
22 words
The composition of claim 15 wherein said aryl hydroxy (-OH) compound is selected from the group consisting of naphthols and substituted phenols.
Claim 16
Dependent Claim
14 words
The composition of claim 16 wherein said aryl hydroxy (-OH) compound is Beta -naphthol.
Claim 17
Dependent Claim
16 words
A composition as claimed in claim 16 wherein said aryl hydroxy (-OH) compound 13 2,4,6 trichlorophenol.
Claim 18
Dependent Claim
14 words
The composition of claim 16 wherein said aryl hydroxy (-OH) compound is p,p'' dihydroxydiphenylsulfone.
Claim 19
Dependent Claim
13 words
The composition of claim 16 wherein said aryl hydroxy (-OH) compound is 2,7-naphthalenediol.
Claim 20
Dependent Claim
13 words
The composition of claim 16 wherein said aryl hydroxy (-OH) compound is 1,1''-bi-2-naphthol.
Claim 21
Dependent Claim
14 words
The composition of claim 16 wherein said aryl hydroxy (-OH) compound is Alpha -naphthol.
Claim 22
Dependent Claim
15 words
A composition as claimed in claim 15 wherein the polyether surfactant is of the formula:
Claim 23
Dependent Claim
23 words
The composition of claim 23 wherein the said polyether surfactant is a nonylphenol-ethylene oxide condensate exhibiting about fifteen ethylene oxide groups per molecule.
Claim 24
Dependent Claim
15 words
A composition as claimed in claim 15 wherein the polyether surfactant is of the formula:
Claim 25
Dependent Claim
24 words
The composition of claim 15 wherein said water soluble stannous tin salt is stannous fluoborate and said water soluble lead salt is lead fluoborate.
Claim 26
Dependent Claim
17 words
The composition of claim 15 wherein the said tin-lead alloy is substantially 60% tin and 40% lead.
Claim 27
Dependent Claim
99 words
A composition for providing white, continuous, fine-grained tin-lead alloy electrodeposits consisting of an aqueous acidic bath composition consisting of: a. 4 grams per liter to 53 grams per liter of stannous tin; b. 1 gram per liter to 85 grams per liter of lead; c. 100 grams per liter to 200 grams per liter of free fluoboric acid; d. 4 grams per liter to 10 grams per liter of a polyether surfactant; and e. 0.5 grams per liter to 1.0 gram per liter of an aryl hydroxy (-OH) compoUnd selected from the group consisting of naphthols and substituted phenols.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |