Patent CH42266A successfully refreshed from Google Patents.
US4036707A
Expired / Lapsed
US
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Method for metallizing thermosetting plastics
Assignee: Siemens AG
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Filing: 1976-08-19
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Granted: 1977-07-19
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Expires: 1996-08-19
Abstract
Abstract A method for metallizing a thermosetting resin is provided comprising: A. etching the surface of said resin with an oxidizing acid; B. activating the surface of said resin with a stannous chloride solution; C. sensitizing said resin in an aqueous solution of from 0.1 to 0.5 g per liter of palladium chloride and 1 to 6 ml of concentrated hydrochloric acid per liter; D. immersing said resin at about 90° C in an accelerator bath having a pH of about 7, said bath containing sodium hypophosphite, trisodium citrate, ammonium chloride and 2,4-dihydroxy benzoic acid; E. electrolessly nickel-plating said resin at a temperature of between about 96° to 99° C in a fast-depositing nickel bath having a pH of about 6.5 to 6.9 to form a nickel layer; F. electroplating said nickel layer with copper; and G. metallizing said copper layer to form a metallized layer. The deposited metal coatings are particularly strongly adhering, abrasion and wear-proof and particularly well suited for metallizing type carriers for teleprinters.
Inventors
- 👤 Herbert Januschkowetz
- 👤 Hans Laub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:05
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
143 words
A method for metallizing a thermosetting resin comprising: a. etching the surface of said resin with an oxidizing acid; b. activating the surface of said resin with a stannous chloride solution; c. sensitizing said resin in an aqueous solution of from 0.1 to 0.5 g per liter of palladium chloride and 1 to 6 ml of concentrated hydrochloric acid per liter; d. immersing said resin at about 90° C. in an accelerator bath having a pH of about 7, said bath containing sodium hypophosphite, trisodium citrate, ammonium chloride and 2,4-dihydroxy benzoic acid; e. electrolessly nickel-plating said resin at a temperature of between about 96° to 99° C. in a fast-depositing nickel bath having a pH of about 6.5 to 6.9 to form a nickel layer; f. electroplating said nickel layer with copper; and g. metallizing said copper layer to form a metallized layer.
Claim 2
Independent Claim
143 words
A method for metallizing a thermosetting resin comprising: a. etching the surface of said resin with an oxidizing acid; b. activating the surface of said resin with a stannous chloride solution; c. sensitizing said resin in an aqueous solution of from 0.1 to 0.5 g per liter of palladium chloride and 1 to 6 ml of concentrated hydrochloric acid per liter; d. immersing said resin at about 90° C. in an accelerator bath having a pH of about 7, said bath containing sodium hypophosphite, trisodium citrate, ammonium chloride and 2,4-dihydroxy benzoic acid; e. electrolessly nickel-plating said resin at a temperature of between about 96° to 99° C. in a fast-depositing nickel bath having a pH of about 6.5 to 6.9 to form a nickel layer; f. electroplating said nickel layer with copper; and g. metallizing said copper layer to form a metallized layer.
Claim 3
Dependent Claim
12 words
The method of claim 1 which further comprises chrome-plating said metallized layer.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said oxidizing acid is a chromic-sulfuric acid mixture.
Claim 5
Dependent Claim
24 words
The method of claim 3 wherein said etching is conducted for between about 4 and 5 minutes at a temperature of about 80° C.
Claim 6
Dependent Claim
31 words
The method of claim 1 wherein said stannous chloride solution comprises from about 20 g per liter of SnCl.sub. 2.2H 2 O and 60 ml of concentrated hydrochloric acid per liter.
Claim 7
Dependent Claim
40 words
The method of claim 1 wherein said resin is sensitized for about 0.5 to 3 minutes in a palladium chloride solution comprising about 0.2 g of palladium chloride per liter and about 3 ml of concentrated hydrochloric acid per liter.
Claim 8
Dependent Claim
52 words
The method of claim 1 wherein said resin is immersed in said acceleration bath for about 2 to 3 minutes, said bath containing about 70 g/l sodium hypophosphite about 25 g/l trisodium citrate, about 25 g/l ammonium chloride and about 1 g/l of 2,4-dihydroxy benzoic acid at a pH of about 7.
Claim 9
Dependent Claim
41 words
The method of claim 1 wherein said electroless nickel-plating step is carried out for about 4 to 6 minutes in a fast-depositing nickel bath comprising complex salts, sodium hypophosphite and about 0.1 to 5 g liter of a water-soluble polyhydroxy benzene.
Claim 10
Dependent Claim
15 words
The method of claim 8 wherein said nickel bath further comprises a water-soluble copper salt.
Claim 11
Dependent Claim
13 words
The method of claim 1 wherein said metallizing is carried out by electrodeposition.
Claim 12
Dependent Claim
24 words
The method of claim 10 wherein the metallized layer is electroplated with a metal selected from the group consisting of nickel, tin and silver.
Claim 13
Dependent Claim
32 words
The method of claim 2 wherein said chrome-plating is carried out at a current density of about 10 to 20 A/dm 2 and a temperature of about 45° C. to 50° C.
Claim 14
Dependent Claim
22 words
The method of claim 12 wherein said current density is 15 A/dm 2 and said temperature is from 46° to 48° C.
Claim 15
Dependent Claim
12 words
The method of claim 1 wherein said resin is a phenolic resin.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |