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US4102702A
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Composition and method for applying metallic silver to a substrate
Assignee: Peacock Laboratories Inc
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Filing: 1976-06-07
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Granted: 1978-07-25
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Expires: 1996-06-07
Abstract
Abstract High efficiency deposition of silver on the surface of a substrate is obtained by providing a solution containing reducible dissolved silver in the presence of an alkali metal hydroxide and ammonia, all of which are applied to the substrate in the presence of an aqueous solution of a moderating reducer containing a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH, where n is an integer from 1 to 6. Preferably the polyhydric alcohol is sorbitol, and in a preferred embodiment a moderator is the form of a thio glycerol is present.
Inventors
- 👤 Harry Bahls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:32
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; C23C18/44
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
In an aqueous solution for use in precipitating metallic silver from an ionic solution on the surface of a substrate, the combination which comprises a water-soluble reducible silver salt, an alkali metal hydroxide, and ammonia, the improvement which comprises including a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH, where n is an integer from 1 to 6.
Claim 2
Dependent Claim
62 words
In an aqueous solution for use in precipitating metallic silver from an ionic solution on the surface of a substrate, the combination which comprises a water-soluble reducible silver salt, an alkali metal hydroxide, and ammonia, the improvement which comprises including a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH, where n is an integer from 1 to 6.
Claim 3
Dependent Claim
39 words
The solution defined in claim 1, wherein said polyhydric alcohol is selected from the group consisting of erythritol, threitol, arabinitol, ribitol, xylitol, allitol, galactitol, glucitol, iditol, mannitol, altritol, volemitol, glycero-altro heptitol, erythro-galacto octitol and dextro and laevo isomers thereof.
Claim 4
Dependent Claim
12 words
The solution defined in claim 1, wherein said polyhydric alcohol is sorbitol.
Claim 5
Dependent Claim
85 words
In an aqueous solution for use in precipitating metallic silver from an ionic solution on the surface of a substrate, the combination which comprises a water-soluble reducible silver salt, an alkali metal hydroxide, and ammonia, the improvement which comprises including a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH, where n is an integer from 1 to 6 and a thio compound of the formula CH 2 OH-(CHOH) m -CH 2 SH, where m is an integer from 0 to 1.
Claim 6
Dependent Claim
85 words
In an aqueous solution for use in precipitating metallic silver from an ionic solution on the surface of a substrate, the combination which comprises a water-soluble reducible silver salt, an alkali metal hydroxide, and ammonia, the improvement which comprises including a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH, where n is an integer from 1 to 6 and a thio compound of the formula CH 2 OH-(CHOH) m -CH 2 SH, where m is an integer from 0 to 1.
Claim 7
Dependent Claim
13 words
The solution defined in claim 4, wherein said thio compound is 1-thio glycerol.
Claim 8
Dependent Claim
12 words
The solution defined in claim 5, wherein said polyhydric alcohol is sorbitol.
Claim 9
Dependent Claim
24 words
The solution defined in claim 1, wherein said solution also contains about 5 to 15 ml of formaldehyde per pound of said polyhydric alcohol.
Claim 10
Dependent Claim
102 words
An aqueous solution having modifying characteristics in the electroless reduction deposition of metallic silver as a film upon a substrate wherein said silver is present as a silver diammine, said solution consisting essentially of water, and in quantities by weight based upon the weight of the water: (a) 5 to 35% of a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH, where n is an integer from 1 to 8, and (b) 0.004 to 0.020% of a thio compound of the formula CH 2 OH-(CHOH) m -CH 2 SH, where m is an integer from 0 to 1.
Claim 11
Dependent Claim
102 words
An aqueous solution having modifying characteristics in the electroless reduction deposition of metallic silver as a film upon a substrate wherein said silver is present as a silver diammine, said solution consisting essentially of water, and in quantities by weight based upon the weight of the water: (a) 5 to 35% of a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH, where n is an integer from 1 to 8, and (b) 0.004 to 0.020% of a thio compound of the formula CH 2 OH-(CHOH) m -CH 2 SH, where m is an integer from 0 to 1.
Claim 12
Dependent Claim
12 words
The solution defined in claim 8, wherein said polyhydric alcohol is hexahydric.
Claim 13
Dependent Claim
13 words
The solution as defined in claim 9, wherein said polyhydric alcohol is sorbitol.
Claim 14
Dependent Claim
13 words
The solution defined in claim 8, wherein said polyhydric alcohol is 1-thio glycerol.
Claim 15
Dependent Claim
20 words
The solution as defined in claim 8, wherein said polyhydric alcohol is sorbitol and said thio compound is 1-thio glycerol.
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) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |