US3914520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for plating of plastic
Assignee: Siemens AG
•
Filing: 1973-03-16
•
Granted: 1975-10-21
•
Expires: 1993-03-16
Abstract
Abstract The invention relates to a method of plating metal on a polyamide plastic such as nylon in which absorbed moisture in the plastic is at least partially removed under evaporative conditions to provide a surface having an affinity for water. The subsequent treatment of the plastic is carried out with an aqueous solution of palladium chloride at an elevated temperature of 100*-212*F. followed by an aqueous solution of stannous chloride after which the activated surface is metal plated by electroless deposition of metal.
Inventors
- 👤 Ralph James Hovey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:48
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/38; H05K3/381; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A METHOD OF PLATING METAL ON A POLYAMIDE PLASTIC SURFACE HAVING ABSORBED MOISTURE, WHICH COMPRISES REMOVING UNDER EVAPORATIVE CONDITIONS AT LEAST A PORTION OF THE ABSORBED MOISTURE TO PROVIDE A DRY SURFACE, HEATING THE PLASTIC IN AN AQUEOUS IMPREGNATING SOLUTUIN OF A CATALYTIC MATERIAL AT AN ELEVATED TEMPERATURE OF AT LEAST 100*F, TO IMPREGNATE THE SURFACE WITH THE CATALYTIC MATERIAL, TREATING THE IMPREGNATED SURFACE WITH AN AQUEOUS SOLUTION OF A REDUCING AGENT TO ACTIVATE SAID CATALYTIC MATERIAL, AND ELECTROLESSLY DEPOSITING METAL ON THE ACTIVATED SURFACE.
Claim 2
Independent Claim
85 words
A METHOD OF PLATING METAL ON A POLYAMIDE PLASTIC SURFACE HAVING ABSORBED MOISTURE, WHICH COMPRISES REMOVING UNDER EVAPORATIVE CONDITIONS AT LEAST A PORTION OF THE ABSORBED MOISTURE TO PROVIDE A DRY SURFACE, HEATING THE PLASTIC IN AN AQUEOUS IMPREGNATING SOLUTUIN OF A CATALYTIC MATERIAL AT AN ELEVATED TEMPERATURE OF AT LEAST 100*F, TO IMPREGNATE THE SURFACE WITH THE CATALYTIC MATERIAL, TREATING THE IMPREGNATED SURFACE WITH AN AQUEOUS SOLUTION OF A REDUCING AGENT TO ACTIVATE SAID CATALYTIC MATERIAL, AND ELECTROLESSLY DEPOSITING METAL ON THE ACTIVATED SURFACE.
Claim 3
Dependent Claim
44 words
The method of claim 1 wherein the step of removing at least a portion of the absorbed moisture is carried out in the presence of a desiccant, and the step of heating the polyamide plastic is carried out at a temperature of about 160*-180*F.
Claim 4
Dependent Claim
23 words
The method of claim 2, which includes the step of electroplating a second metal on the metallic surface of the electrolessly deposited metal.
Claim 5
Dependent Claim
27 words
The method of claim 1 which includes the prior step of conditioning the plastic surface to form irregular sites which are subsequently treated to remove absorbed moisture.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein the heating step is carried out with a solution of a palladium salt and the treating step is carried out with a solution of a stannous salt.
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein the treating step is carried out at a temperature of about 70*-75*F.
Claim 8
Dependent Claim
40 words
The method of claim 6 wherein the step of removing at least a portion of the absorbed moisture is carried out in the presence of a desiccant and the heating step is carried out at a temperature of about 160*-180*F.
Claim 9
Dependent Claim
8 words
A product of the process of claim 1.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |