US3767538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating plastic films with metal
Assignee: Siemens AG
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Filing: 1972-01-06
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Granted: 1973-10-23
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Expires: 1992-01-06
Abstract
Abstract A method of coating a polyester or polyimide film with a metal whereby the film surfaces to be coated are at first cleansed, degreased and roughened, as by the use of chemical agents and are then heated at temperatures of about 60* to 150* C. for a period of time sufficient to expel any water that may be present. The film is then dipped into a solution containing palladium ions so that seed crystals thereof form on the film surfaces to be coated. Thereafter, an electrically conductive, water-vapor permeable continuous layer of silver is produced onto the palladium-containing film surfaces and the silver-coated film is then heated at temperatures of about 60* to 150* C. for a period of time sufficient to expel any water that may be present. Then a reinforcing metal layer, as of copper, is galvanically produced onto the silver layer and the so-coated film is usable, for example in the manufacture of electronic circuit assemblies.
Inventors
- 👤 A Politycki
- 👤 W Stoeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:46
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/38; C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/2006; C23C18/2013; C23C18/2026; C23C18/2033; C23C18/2046; C23C18/2073; C23C18/208; C23C18/2086; C23C18/22; C23C18/24; C23C18/28; C23C18/30; C25; C25D; C25D5/00; C25D5/54; C25D5/56; Y; Y10; Y10S; Y10S205/00; Y10S205/917
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
A method as defined in claim 1 wherein step (3) comprises wetting the surface to be coated with a solution containing palladium and stannous ions.
Claim 2
Dependent Claim
30 words
A method as defined in claim 1 wherein the plastic film is composed of polyimide resin and is heated at steps (2) and (5) at temperatures of about 130* C.
Claim 3
Dependent Claim
31 words
A method as defined in claim 1 wherein the plastic film is composed of polyethylene terephthalate resin and is heated at steps (2) and (5) at temperatures of about 100* C.
Claim 4
Dependent Claim
17 words
A method as defined in claim 1 wherein step (6) is performed relatively quickly after step (5).
Claim 5
Dependent Claim
37 words
A method as defined in claim 1 wherein step (6) comprises initially applying a relatively low electric current until a sufficiently conductive layer is formed and then increasing the current to the optimum value for galvanic deposition.
Claim 6
Independent Claim
169 words
A method of coating select surfaces of a polyimide film with a metal layer consisting of the sequential steps of: (1) cleaning, degreasing and roughening said select surfaces with a mixture of concentrated hydrosulfuric acid and concentrated hydrochloric acid, the ratio of said acids in said mixture ranging from about 9:1 to about 7:1 respectively; (2) heating the roughened film in vacuum at temperatures of about 60* to 150* C. for about 10 to 15 hours; (3) wetting said select surfaces with a solution containing about 0.1 percent to about 1 percent palladium chloride for a period of time sufficient to form seed crystals of palladium onto said select surfaces; (4) chemically producing a continuous layer of silver onto said select surfaces in a thickness ranging from about 30 to about 300 nano meters; (5) heating the silver coated film in a vacuum at temperatures of about 60* to 150* C. for about 10 to 15 hours; and (6) galvanically depositing a layer of copper onto said silver layer.
Claim 7
Independent Claim
223 words
A method of coating select surfaces of a polyimide film with a metal layer consisting of the sequential steps of: (1) cleaning, degreasing and roughening said select surfaces with a mixture of concentrated hydrosulfuric acid and concentrated hydrochloric acid, the ratio of said acids in said mixture ranging from about 9:1 to about 7:1 respectively, said mixture including about 0.1 to about 1 gram of stannous chloride for each liter of acid mixture; (2) flushing said select surfaces with water and contacting said surfaces with a caustic soda solution having a concentration of about 10 to 50 percent and a temperature ranging from about 50* to 70 * C.; (3) flushing said select surfaces with water and heating the roughened film in vacuum at temperatures of about 60* to 150* C. for about 10 to 15 hours; (4) wetting said select surfaces with a solution containing stannous chloride and with a solution containing palladium chloride so that seed crystals of palladium form on said select surfaces; (5) chemically producing a continuous layer of silver onto said select surfaces in a thickness ranging from about 30 to about 300 nano meters; (6) heating the silver-coated film in a vacuum at temperatures of about 60* to 150* for about 10 to 15 hours; and (7) galvanically depositing a layer of copper onto said silver layer.
References Cited (Backward Citations)
US3616296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |