US4725314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic metal of reduced particle size
Assignee: Shipley Co Inc
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Filing: 1986-09-17
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Granted: 1988-02-16
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Expires: 2006-09-17
Abstract
Abstract A catalytic adsorbate suspended in an aqueous solution comprising reduced catalytic metal on an organic suspending agent where the reduced catalytic metal has a maximum dimension not exceeding 500 angstroms. The catalytic adsorbate is useful for the electroless metal deposition of substrates that are non-catalytic to electroless metal deposition.
Inventors
- 👤 Michael Gulla
- 👤 Oleh B. Dutkewych
- 👤 John J. Bladon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:40
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28; C23C18/30
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
127 words
A process for the formation of an adsorbate of an organic water soluble or dispersible polymeric suspending agent and a reduced platinum family metal having an average maximum dimension not exceeding 500 Angstroms, said process comprising the steps of: a. forming an aqueous acid solution of the catalytic metal where the concentration of the metal is at least 10 parts per million parts of solution and the solution has a pH not exceeding 5.5; b. adding a polymeric suspending agent to the aqueous solution of the platinum family metal which suspending agent is capable of associating with the platinum family metal while stabilizing the same against aggregation, precipitation and oxidative dissolution; and c. reducing the same under conditions favoring a rapid formation of reduced platinum family nuclei.
Claim 2
Dependent Claim
127 words
A process for the formation of an adsorbate of an organic water soluble or dispersible polymeric suspending agent and a reduced platinum family metal having an average maximum dimension not exceeding 500 Angstroms, said process comprising the steps of: a. forming an aqueous acid solution of the catalytic metal where the concentration of the metal is at least 10 parts per million parts of solution and the solution has a pH not exceeding 5.5; b. adding a polymeric suspending agent to the aqueous solution of the platinum family metal which suspending agent is capable of associating with the platinum family metal while stabilizing the same against aggregation, precipitation and oxidative dissolution; and c. reducing the same under conditions favoring a rapid formation of reduced platinum family nuclei.
Claim 3
Dependent Claim
29 words
The process of claim 1 where the conditions favoring the rapid formation of nuclei include rapid addition of a reducing agent while maintaining the solution at a reduced temperature.
Claim 4
Dependent Claim
25 words
The process of claim 2 where pH varies between 1.5 and 3.6 and the temperature of the solution is maintained between 0° and 20° C.
Claim 5
Dependent Claim
31 words
The process of claim 1 where the concentration of dissolved platinum family metal in solution at the time of reduction varies between 10 and 2,000 parts per million parts of solution.
Claim 6
Dependent Claim
24 words
The process of claim 4 where the concentration of the platinum family metal varies between 500 and 1,500 parts per million parts of solution.
Claim 7
Dependent Claim
31 words
The process of claim 1 where the reducing agent is selected from the group of ascorbic acid, iso-ascorbic acid, formaldehyde, phosphorus acid, hypophosphite, formic acid, borohydrides, amine boranes and hydrogen gas.
Claim 8
Dependent Claim
24 words
The process of claim 6 where the reducing agent is one capable of causing essentially simultaneous nucleation of the dissolved platinum family metal ions.
Claim 9
Dependent Claim
20 words
The process of claim 6 where the reducing agent is selected from the group of ascorbic acid and iso-ascorbic acid.
Claim 10
Dependent Claim
28 words
The process of claim 6 where the reducing agent is rapidly added to the platinum family metal containing solution over a period of time not exceeding 30 minutes.
Claim 11
Dependent Claim
33 words
The process of claim 7 including the step of adding a hydroxy substituted compound selected from the group of alcohols and glycols to the solution of the adsorbate following the step of reduction.
Claim 12
Dependent Claim
16 words
The process of claim 10 where the hydroxy substituted compound is a propylene glycol methyl ether.
Claim 13
Dependent Claim
33 words
The process of claim 1 where the polymeric suspending agent is selected from the group of alkyl and hydroxyalkyl celluloses, polyacrylamides, polyethylene glycol, polyvinyl alcohol and polyvinyl pyrrolidone and surfactants with polymer adducts.
Claim 14
Dependent Claim
17 words
The process of claim 12 where the polymer is one capable of complexing with the platinum metal.
Claim 15
Dependent Claim
11 words
The process of claim 12 where the polymer is polyvinyl pyrrolidone.
Claim 16
Dependent Claim
23 words
The process of claim 12 where the concentration of the suspending agent varies between 10 and 100,000 parts per million parts of solution.
Claim 17
Dependent Claim
19 words
The process of claim 15 where the concentration varies between 20 and 10,000 parts per million parts of solution.
Claim 18
Dependent Claim
118 words
A process for the formation of an adsorbate of reduced palladium having an average maximum dimension not exceeding 500 angstroms and an organic water soluble or dispersible polymeric suspending agent, said process comprising: a. forming an aqueous acid solution of the palladium in a concentration of at least 10 parts per million parts of solution, said solution having a pH that does not exceed 5.5, b. adding a polymeric suspending agent to the aqueous solution of palladium which suspending agent is capable of complexing with the palladium while stabilizing the same against aggregation, precipitation and oxidative dissolution, and c. rapidly reducing the palladium with the essentially simultaneous formation of nuclei while maintaining the solution at a reduced temperature.
Claim 19
Dependent Claim
118 words
A process for the formation of an adsorbate of reduced palladium having an average maximum dimension not exceeding 500 angstroms and an organic water soluble or dispersible polymeric suspending agent, said process comprising: a. forming an aqueous acid solution of the palladium in a concentration of at least 10 parts per million parts of solution, said solution having a pH that does not exceed 5.5, b. adding a polymeric suspending agent to the aqueous solution of palladium which suspending agent is capable of complexing with the palladium while stabilizing the same against aggregation, precipitation and oxidative dissolution, and c. rapidly reducing the palladium with the essentially simultaneous formation of nuclei while maintaining the solution at a reduced temperature.
Claim 20
Dependent Claim
14 words
The process of claim 17 where the polymeric organic suspending agent is polyvinyl pyrrolidone.
Claim 21
Dependent Claim
27 words
The process of claim 18 where the temperature of the solution is maintained between 0° and 20° C. and the pH is maintained between 1.5 and 3.6.
Claim 22
Dependent Claim
29 words
The process of claim 17 where the concentration of dissolved palladium in solution at the time of reduction varies between 10 and 2,000 parts per million parts of solution.
Claim 23
Dependent Claim
22 words
The process of claim 20 where the concentration of the palladium varies between 300 and 1,500 parts per million parts of solution.
Claim 24
Dependent Claim
20 words
The process of claim 18 where the reducing agent is selected from the group of ascorbic acid and iso-ascorbic acid.
Claim 25
Dependent Claim
42 words
The process of claim 18 including the step of adding a hydroxy substituted compound selected from the group of alcohols and glycols to the solution of the catalytic adsorbate following the step of reduction to inhibit further growth of the palladium particles.
Claim 26
Dependent Claim
14 words
The process of claim 23 where the hydroxy compound is propylene glycol methyl ether.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |