US4568570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for activating substrates for electroless metallization
Assignee: Bayer AG
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Filing: 1984-10-15
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Granted: 1986-02-04
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Expires: 2004-10-15
Abstract
Abstract A gentle and inexpensive process for activating surfaces for electroless metallization comprises wetting the surfaces with an activating solution containing a silver-I compound which is sparingly soluble in water (for example AgCl) and which has been converted into a soluble form with the aid of complexing agents (for example NH 3 ), splitting the soluble complex compound back into the sparingly soluble compound and reducing the silver-I compound remaining on the surface.
Inventors
- 👤 Henning Giesecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:51
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
Process for activating non-conductive or semiconductive substrate surfaces for the purpose of electroless metallisation, characterised in that (a) the surface to be metallised is wetted with an activating solution containing a silver-I compound which is sparingly soluble in water and has been converted into a soluble form with the aid of complexing agents, (b) the soluble complex compound is split back into the sparingly soluble silver-I compound and (c) the silver-I compound remaining on the surface of the substrate is reduced.
Claim 2
Dependent Claim
81 words
Process for activating non-conductive or semiconductive substrate surfaces for the purpose of electroless metallisation, characterised in that (a) the surface to be metallised is wetted with an activating solution containing a silver-I compound which is sparingly soluble in water and has been converted into a soluble form with the aid of complexing agents, (b) the soluble complex compound is split back into the sparingly soluble silver-I compound and (c) the silver-I compound remaining on the surface of the substrate is reduced.
Claim 3
Dependent Claim
31 words
Process according to claim 1, characterised in that silver chloride, silver bromide, silver cyanide, silver isothiocyanate, silver chromate, silver nitrite, silver metaphosphate or silver diphosphate is used as the silver-I compound.
Claim 4
Dependent Claim
23 words
Process according to claim 1, characterised in that ammonia or amines with a boiling point below 100° C. are used as complexing agents.
Claim 5
Dependent Claim
19 words
Process according to claim 1, characterised in that the concentration of the silver complex solution is 0.01 to 10%.
Claim 6
Dependent Claim
18 words
Process according to claim 1, characterised in that activating solutions which are free from organic solvents are used.
Claim 7
Dependent Claim
17 words
Process according to claim 1, characterised in that the soluble silver complexes are split back by drying.
Claim 8
Dependent Claim
19 words
Process according to claim 1, characterised in that the silver complexes are split back by heating to 50°-150° C.
Claim 9
Dependent Claim
21 words
Process according to claim 1, characterised in that the soluble silver complexes are split back by the action of mineral acids.
Claim 10
Dependent Claim
22 words
Process according to claim 1, characterised in that the silver compound which has been split back is reduced in the metallisation bath.
Claim 11
Dependent Claim
25 words
Process according to claim 9 characterized in that the silver compound which has been split back is reduced in a nickel metallisation bath containing aminoborane.
Claim 12
Dependent Claim
25 words
Process according to claim 9 characterized in that the silver compound which has been split back is reduced in a copper metallisation bath containing formalin.
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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |