US4244739A
Expired / Lapsed
US
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Catalytic solution for the electroless deposition of metals
Assignee: Individual
•
Filing: 1979-07-10
•
Granted: 1981-01-13
•
Expires: 1999-07-10
Abstract
Abstract A catalytic solution for electroless deposition of metals, wherein at least a part of the acid, contained therein along with a soluble salt of a noble metal and a soluble salt of a metal of group IB or VIII of the periodic system, is an aliphatic sulphonic acid capable of forming stable and catalytically active complexes, such as methane-sulphonic acid.
Inventors
- 👤 Roberto Cagnassi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:14
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
109 words
In a catalytic solution for the electroless deposition of metals onto electrically non conductive or only partially conductive supports, containing the products of mixing and reaction of at least one water-soluble salt of a noble metal of group IB or group VIII of the periodic system, at least one water-soluble salt of a metal of group IV of the periodic system, and an acid capable of forming stable complexes with said salts, the improvement that at least most of said acid is an aliphatic sulphonic acid having the general formula RSO 3 H, where R is a linear or branched aliphatic group containing from 1 to 6 carbon atoms.
Claim 2
Dependent Claim
109 words
In a catalytic solution for the electroless deposition of metals onto electrically non conductive or only partially conductive supports, containing the products of mixing and reaction of at least one water-soluble salt of a noble metal of group IB or group VIII of the periodic system, at least one water-soluble salt of a metal of group IV of the periodic system, and an acid capable of forming stable complexes with said salts, the improvement that at least most of said acid is an aliphatic sulphonic acid having the general formula RSO 3 H, where R is a linear or branched aliphatic group containing from 1 to 6 carbon atoms.
Claim 3
Dependent Claim
40 words
A solution according to claim 1, wherein the said aliphatic sulphonic acid is methane-sulphonic acid in such a concentration as to ensure the stability and catalytic activity of the solution resulting from the mixing and the reaction of the components.
Claim 4
Dependent Claim
28 words
A solution according to claim 1, wherein the said water soluble salt of a noble metal is a salt of a metal of the group of the platinum.
Claim 5
Dependent Claim
21 words
A solution according to claim 1, wherein the said water soluble salt of a noble metal is a salt of palladium.
Claim 6
Dependent Claim
24 words
A solution according to claim 1, wherein the said soluble salt of a noble metal is a palladium salt of an aliphatic sulphonic acid.
Claim 7
Dependent Claim
18 words
A solution according to claim 1, wherein the said soluble salt of a noble metal is methane-sulphonate palladium.
Claim 8
Dependent Claim
33 words
A solution according to claim 1, wherein the said soluble salt of a group IV metal is a water soluble stannous salt in molar excess relative to the salt of a noble metal.
Claim 9
Dependent Claim
24 words
A solution according to claim 1, wherein the said water-soluble salt of group IV metal is a stannous salt of an aliphatic sulphonic acid.
Claim 10
Dependent Claim
18 words
A solution according to claim 1, wherein the said water-soluble salt of group IV metal is stannous methane-sulphonate.
Claim 11
Dependent Claim
34 words
A solution according to claim 1, wherein the molar ratio between the water soluble salt of a noble metal and the water soluble salt of a group IV metal is from 1:5 to 1:100.
Claim 12
Dependent Claim
33 words
A solution according to claim 1, wherein the molar ratio between the soluble salt of a noble metal and the water soluble salt of a group IV metal is from 1:10 to 1:60.
Claim 13
Dependent Claim
23 words
A solution according to claim 1, wherein the concentration of the aliphatic sulphonic acid ranges between 0.1 g/l and the limit of solubility.
Claim 14
Dependent Claim
21 words
A solution according to claim 1, wherein the concentration of the aliphatic sulphonic acid ranges from 1 molar to 10 molar.
Claim 15
Dependent Claim
22 words
A solution according to claim 1, wherein the concentration of the salt of a noble metal ranges from 0.001 to 50 g/l.
Claim 16
Dependent Claim
34 words
A solution according to claim 1, wherein, the solution is concentrated and intended to be diluted for the use, the concentration of the salt of the noble metal ranges between 1 and 50 g/l.
Claim 17
Dependent Claim
35 words
A solution according to claim 1, wherein, the solution which is ready for use for the electroless deposition of a metal, has a concentration of the noble metal salt ranging from 0.001 to 1 g/l.
Claim 18
Dependent Claim
16 words
A solution according to claim 1, wherein halides are present as no more than as traces.
Claim 19
Dependent Claim
18 words
A solution according to claim 1, wherein free hydrochloric acid is present as no more than a trace.
Claim 20
Dependent Claim
20 words
A solution according to claim 1, wherein both halides and free hydrochloric acid are present as no more than traces.
Claim 21
Dependent Claim
22 words
A solution according to claim 1, which contains a water soluble salt of an alkali metal and of an aliphatic sulphonic acid.
Claim 22
Dependent Claim
10 words
A solution according to claim 1, which contains sodium methane-sulphonate.
Claim 23
Dependent Claim
33 words
A solution according to claim 1, which contains a water soluble salt of an alkali metal and an aliphatic sulphonic acid in a quantity between 1 g/l and the limit of solubility .
Claim 24
Dependent Claim
19 words
A solution according to claim 1, which further contains glycine in a concentration ranging from 0.1 to 25 g/l.
Claim 25
Dependent Claim
32 words
A solution according to claim 1, which contains the products of mixing and reaction of an aliphatic sulphonic acid with a water soluble salt of palladium and with a soluble stannous salt.
Claim 26
Dependent Claim
47 words
A solution according to claim 1, wherein said water-soluble salt of a group IV metal and said water-soluble salt of a noble metal contain halides, and the content of halides in the solution is not substantially higher than the total quantity of halides contained in said salts.
Claim 27
Dependent Claim
39 words
A solution according to claim 1, wherein said water-soluble salt of a group IV metal contains halides, and the content of halides in the solution is not substantially higher than the total quantity of halides contained in said salt.
Claim 28
Dependent Claim
38 words
A solution according to claim 1, wherein said water-soluble salt of a noble metal contains halides, and the content of halides in the solution is not substantially higher than the total quantity of halides contained in said salt.
Claim 29
Dependent Claim
51 words
A solution according to claim 1, comprising a concentrated solution and a diluting solution containing an aliphatic sulphonic acid, wherein said concentrated solution contains chlorine ions, and the content of chlorine ions in the diluting solution is not substantially higher than the quantity of chlorine ions contained in said concentrated solution.
Claim 30
Dependent Claim
12 words
A solution according to claim 1, which is substantially free from halides.
Claim 31
Dependent Claim
14 words
A solution according to claim 1, which is substantially free from free hydrochloric acid.
Claim 32
Dependent Claim
17 words
A solution according to claim 1, which is substantially free from halides and from free hydrochloric acid.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |