US4182784A
Expired / Lapsed
US
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Method for electroless plating on nonconductive substrates using palladium/tin catalyst in aqueous solution containing a hydroxy substituted organic acid
Assignee: Mcgean Chemical Co
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Filing: 1977-12-16
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Granted: 1980-01-08
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Expires: 1997-12-16
Abstract
Abstract A tin-palladium catalyst useful for electroless deposition of metals, such as copper or nickel, onto a nonconductive substrate, said catalyst containing a much lower concentration of halide ions than similar compositions presently known, or being completely free of halide ions. The tin-palladium catalyst can be prepared from nonhalide salts using a hydroxy substituted organic acid to stabilize the system.
Inventors
- 👤 Gerald A. Krulik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:54
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A method of rendering the surface of a non-conductive substrate catalytic to the electroless deposition of metal including the step of: contacting the surface of said substrate with an aqueous solution obtained by (a) dissolving a stannous salt in an aqueous solution containing a hydroxy substituted organic acid and (b) reacting said stannous salt while in said solution with a palladium salt, with one or both of said palladium and said stannous salts being a salt other than a halide salt, with any halide ion present being derived from said palladium or said stannous salt.
Claim 2
Independent Claim
95 words
A method of rendering the surface of a non-conductive substrate catalytic to the electroless deposition of metal including the step of: contacting the surface of said substrate with an aqueous solution obtained by (a) dissolving a stannous salt in an aqueous solution containing a hydroxy substituted organic acid and (b) reacting said stannous salt while in said solution with a palladium salt, with one or both of said palladium and said stannous salts being a salt other than a halide salt, with any halide ion present being derived from said palladium or said stannous salt.
Claim 3
Dependent Claim
27 words
A method as defined in claim 1 wherein said hydroxy substituted organic acid is selected from the group consisting of tartaric acid, citric acid, and lactic acid.
Claim 4
Dependent Claim
14 words
A method as defined in claim 2 wherein said organic acid is tartaric acid.
Claim 5
Dependent Claim
14 words
The method as defined in claim 2 wherein said organic acid is citric acid.
Claim 6
Dependent Claim
14 words
A method as defined in claim 2 wherein said organic acid is lactic acid.
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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |