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US5207889A
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Method of producing treated copper foil, products thereof and electrolyte useful in such method
Assignee: Circuit Foil USA Inc
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Filing: 1991-01-16
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Granted: 1993-05-04
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Expires: 2011-01-16
Abstract
Abstract An improved treatment for copper foil comprising electrodepositing a metallic barrier layer of copper, zinc and antimony on at least one side of the foil which, preferably, has a matte surface formed prior to forming the barrier layer. The so-treated foil provides a high bonding strength when laminated to polymeric substrates and resists undercutting by mineral acid etchants and rinses during production of printed circuit boards.
Inventors
- 👤 Adam M. Wolski
- 👤 Laurette M. Maguet
- 👤 Michel Streel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:22
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/38; H05K3/382; H05K3/384; C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/58; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2203/00; H05K2203/03; H05K2203/0307; H05K2203/07; H05K2203/0703; H05K2203/0723
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
36 words
A method of treating copper foil comprising forming on at least one side thereof an electrodeposited metallic barrier layer comprising about 65-80 weight % copper, about 20-35 weight % zinc and about 2-5 weight % antimony.
Claim 2
Independent Claim
36 words
A method of treating copper foil comprising forming on at least one side thereof an electrodeposited metallic barrier layer comprising about 65-80 weight % copper, about 20-35 weight % zinc and about 2-5 weight % antimony.
Claim 3
Dependent Claim
35 words
The method of claim 1, wherein said side of said foil is provided with a matte surface formed on a raw surface of said foil by electrodeposition of copper prior to forming said barrier layer.
Claim 4
Dependent Claim
26 words
The method of claim 2, wherein said matte surface is formed by electrodepositing on said foil a plurality of copper layers each having different physical characteristics.
Claim 5
Dependent Claim
30 words
The method of claim 2, wherein said barrier layer is electrodeposited from an electrolyte solution which comprises: copper sulfate; zinc sulfate; potassium pyrophosphate; potassium; sodium tartrate; and antimony potassium tartrate.
Claim 6
Dependent Claim
91 words
The method of claim 4, wherein said copper, zinc and antimony are electrodeposited onto said side of said foil using direct current at a current density of from about 3-10 amperes per square meter, said electrolyte is maintained at a temperature of from about 40°-60° C. and said electrolyte comprises the following ingredients in the indicated amounts: ______________________________________
copper sulfate 25-100 grams per liter
zinc sulfate 6-24 grams per liter
potassium pyrophosphate
100-350 grams per liter
potassium, sodium tartrate
10-50 grams per liter
antimony potassium tartrate
0.5-5 grams per liter.
______________________________________
Claim 7
Dependent Claim
9 words
Copper foil produced by the method of claim 1.
Claim 8
Dependent Claim
30 words
The copper foil of claim 6, wherein said side of said foil is provided with an electrodeposited copper matte surface and said barrier layer is electrodeposited on said matte surface.
Claim 9
Dependent Claim
22 words
The copper foil of claim 7, wherein said matte surface comprises a plurality of electrodeposited copper layers each having different physical characteristics.
Claim 10
Dependent Claim
27 words
A laminate comprising the copper foil of claim 6 and a supporting resinous substrate, the barrier layer comprising copper, zinc, and antimony being bonded to said substrate.
Claim 11
Dependent Claim
25 words
The copper foil of claim 6, wherein said barrier layer is a uniform metallic layer of a ternary alloy of said copper, zinc and antimony.
Claim 12
Dependent Claim
27 words
The copper foil of claim 6, wherein said barrier layer is deposited in a layer of from 0.3 to 3 grams per square meter of foil surface.
Claim 13
Dependent Claim
55 words
An electrolyte comprising an aqueous solution of the following ingredients in the indicated amounts: ______________________________________
copper sulfate 25-100 grams per liter
zinc sulfate 6-24 grams per liter
potassium pyrophosphate
100-350 grams per liter
potassium, sodium tartrate
10-50 grams per liter
antimony potassium tartrate
0.5-5 grams per liter
______________________________________ and having a pH of about 8-9.
Claim 14
Dependent Claim
55 words
An electrolyte comprising an aqueous solution of the following ingredients in the indicated amounts: ______________________________________
copper sulfate 25-100 grams per liter
zinc sulfate 6-24 grams per liter
potassium pyrophosphate
100-350 grams per liter
potassium, sodium tartrate
10-50 grams per liter
antimony potassium tartrate
0.5-5 grams per liter
______________________________________ and having a pH of about 8-9.
References Cited (Backward Citations)
US3857681A
Cited
US4572768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |