US3902908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst system for activating surfaces prior to electroless deposition
Assignee: MacDermid Inc
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Filing: 1973-10-04
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Granted: 1975-09-02
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Expires: 1993-10-04
Abstract
Abstract An electroless metal plating catalyst and a particular method of preparing it at elevated temperature by reaction of a stannous salt and palladous or other similar catalytic metal ion augmented by incorporating a booster compound are disclosed. The resultant catalyst is useable at much lower catalytic metal concentration in plating operations than conventional prior catalysts. The booster compounds employed are acid or alkali soluble metal salts forming a sparingly soluble compound when contacted with conventional alkali or acid accelerators in the plating process.
Inventors
- 👤 Alan Rantell
- 👤 Abraham Holtzman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:26
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28; C23C18/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
144 words
A METHOD FOR PREPARING A CATALYST SOLUTION BY HEATING AN ACID SOLUTION OF A PD(11) CATALYTIC ION WHEREIN SAID CATALYTIC ION IS PRESENT IN AMOUNT SUFFICIENT TO PROVIDE IN THE WORKING STRENGTH CATALYST SOLUTION A CONCENTRATION EQUIVALENT TO ABOUT 10-500 MG/1 OF PD2+ AS PDCL2, WITH A SOLUTION CONTAINING A STOCHIOMETRIC EXCESS OF STANNOUS SALT WHEREIN AT LEAST ONE OF SAID CATALYTIC ION AND STANNOUS SALT SOLUTIONS IS FIRST HEATED TO A TEMPERATURE IN EXCESS OF 75*C BEFORE THE OTHR IS ADDED TO IT, SND WHEREIN A BOOSTER COMPOUND CONSISTING OF A SOLUBLE METAL SALT, OF WHICH THE CATION IS CAPABLE OF FORMING A PRECIPITATE WHEN CONTACTED WITH THE ACCELERATOR SOLUTION USED IN AN ELECTROLESS PROCESS, IS ADDED TO THE CATALYST MIXTURE DURING PREPARATION, SAID BOOSTER COMPOUND BEING PRESENT IN AMOUNT OF ABOUT 0.1 MOL/1 UP TO 5 MOL/1 IN THE WORKING STRENGTH SOLUTION.
Claim 2
Independent Claim
144 words
A METHOD FOR PREPARING A CATALYST SOLUTION BY HEATING AN ACID SOLUTION OF A PD(11) CATALYTIC ION WHEREIN SAID CATALYTIC ION IS PRESENT IN AMOUNT SUFFICIENT TO PROVIDE IN THE WORKING STRENGTH CATALYST SOLUTION A CONCENTRATION EQUIVALENT TO ABOUT 10-500 MG/1 OF PD2+ AS PDCL2, WITH A SOLUTION CONTAINING A STOCHIOMETRIC EXCESS OF STANNOUS SALT WHEREIN AT LEAST ONE OF SAID CATALYTIC ION AND STANNOUS SALT SOLUTIONS IS FIRST HEATED TO A TEMPERATURE IN EXCESS OF 75*C BEFORE THE OTHR IS ADDED TO IT, SND WHEREIN A BOOSTER COMPOUND CONSISTING OF A SOLUBLE METAL SALT, OF WHICH THE CATION IS CAPABLE OF FORMING A PRECIPITATE WHEN CONTACTED WITH THE ACCELERATOR SOLUTION USED IN AN ELECTROLESS PROCESS, IS ADDED TO THE CATALYST MIXTURE DURING PREPARATION, SAID BOOSTER COMPOUND BEING PRESENT IN AMOUNT OF ABOUT 0.1 MOL/1 UP TO 5 MOL/1 IN THE WORKING STRENGTH SOLUTION.
Claim 3
Dependent Claim
58 words
A method for preparing a catalyst as in claim 1, for use in an electroless plating process employing as the accelerator a strong alkali, wherein the booster compound is a salt containing a cation selected from the group consisting of Mg2 , Fe2 , Fe3 , Mn2 , Mn3 , Cu2 , Ni2 , Co2 , Cr3 .
Claim 4
Dependent Claim
55 words
A method for preparing a catalyst as in claim 1, for use in an electroless plating process employing as the accelerator an alkaline ammonia solution, wherein the booster compound is a salt containing a cation selected from the group consisting of Mg2 , Fe3 , Mn2 , Mn3 , Cr3 , Pb2 , Al3 .
Claim 5
Dependent Claim
52 words
A method for preparing a catalyst as in claim 1, for use in an electroless plating process employing as the accelerator sulphuric acid or a soluble acid sulphate, wherein the booster compound is a salt containing a cation selected from the group consisting of Ca2 , Ba2 , Sr2 , Pb2 .
Claim 6
Dependent Claim
76 words
A method for preparing a catalyst as in claim 1, for use in an electroless plating process employing as the accelerator a soluble carbonate or phosphate, wherein the booster compound is a salt containing a cation selected from the group consisting of Ca2 , Ba2 , Sr2 , Pb2 , Mg2 , Fe2 , Fe3 , Mn2 , Mn3 , Cu2 , Ni2 , Co2 , Cr3 , Cd2 , Zn2 , Pb2 , Al3 .
Claim 7
Dependent Claim
59 words
A method for preparing a catalyst as in claim 1, for use in an electroless plating process employing as the accelerator a soluble fluoride, wherein the booster compound is salt containing a cation selected from the group consisting of Mg2 , Ca2 , Ba2 , Sr2 , Zn2 , Cd2 , Al3 , Pb2 , Mn2 , Mn3 .
Claim 8
Dependent Claim
107 words
An aqueous acid catalyst solution comprising a Pd(II) catalytic ion wherein said catalytic ion is present in amount sufficient to provide in the working strength catalyst solution a concentration equivalent to about 10-500 mg/l of Pd2 as PdCl2, a stochiometric excess of stannous salt, and a booster compound consisting of a soluble metal salt of which the cation is capable of formIng a precipitate when contacted with the accelerator solution used in an electroless plating process employing a substrate which has been catalyzed in said catalyst solution, said booster compound being present in amount of about 0.1 mol/l up to 5 mol/l in the working strength solution.
Claim 9
Dependent Claim
107 words
An aqueous acid catalyst solution comprising a Pd(II) catalytic ion wherein said catalytic ion is present in amount sufficient to provide in the working strength catalyst solution a concentration equivalent to about 10-500 mg/l of Pd2 as PdCl2, a stochiometric excess of stannous salt, and a booster compound consisting of a soluble metal salt of which the cation is capable of formIng a precipitate when contacted with the accelerator solution used in an electroless plating process employing a substrate which has been catalyzed in said catalyst solution, said booster compound being present in amount of about 0.1 mol/l up to 5 mol/l in the working strength solution.
Claim 10
Dependent Claim
55 words
An aqueous catalytic solution composition as defined in claim 7, wherein the booster compound is selected from the group consisting of Ca2 , Ba2 , Fr2 , Pb2 , Mg2 , Fe2 , Fe3 , Mn2 , Mn3 , Cu2 , Ni2 , Co2 , Cr3 , Cd2 , Zn2 , Pb2 , Al3 .
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |