US3632435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of substrate for electroless deposition
Assignee: Gylling and Co AB
•
Filing: 1969-06-23
•
Granted: 1972-01-04
•
Expires: 1989-06-23
Abstract
Abstract An improved process is provided for preparing a substrate to receive a metal coating (e.g. copper) over a selected area of its surface by electroless deposition. A substrate is provided with areas of divergent surface characteristics with respect to the retention of a colloidal material, and a coating of a colloidal material is applied to the same which is subsequently subjected to a destabilizing medium (i.e. a stripper) for a time sufficient to substantially remove the colloidal material from those areas in which no electroless deposition is desired. For example, the colloidal material may be (1) a colloidal stannous salt (e.g. stannous chloride), or (2) a colloidal noble metal applied from bath containing a stannous salt (e.g. stannous chloride) and a noble metal salt (e.g. palladium chloride). In (1) a noble metal salt is subsequently contacted with the colloidal coating of stannous salt and is reduced to a colloidal noble metal. The colloidal noble metal at selected areas of the surface of the substrate is catalytic to the deposition of the metal to be deposited electrolessly. Suitably destabilizing media for the removal of a portion of the colloidal material from the surface of the substrate include solutions of strong electrolytes (e.g. basic lead carbonate, ferric chloride, and aluminum sulfate). When the colloidal material is a colloidal noble metal applied from a bath containing both a stannous salt and a noble metal salt, the particularly preferred destabilizer is an organic compound which is capable of removing the noble metal (e.g. palladium). The present process is particularly suited for preparing a substrate, such as a printed circuit card, having through holes so that the walls of the holes as well as other predetermined areas may selectively receive a metal coating by electroless deposition.
Inventors
- 👤 Lars Eriksson
- 👤 Ali Godhan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:21
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1603; C23C18/1607; C23C18/1608; C23C18/18; C23C18/20; C23C18/28; C23C18/1633; C23C18/1635; C23C18/1639; C23C18/1641; C23C18/285; C23C18/30; H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/182; H05K3/40; H05K3/42; H05K3/422; H05K3/425; H05K3/426; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
150 words
an area defined by the wall of at least one through hole which penetrates said resinous material having a substantial tendency to retain an adsorbed colloid, b. contacting the surface of said resinous sheet material with a colloidal suspension of stannous chloride wherein said surface is coated with colloidal stannous chloride, c. contacting said resinous sheet material bearing said coating of colloidal stannous chloride with a solution of an electrolyte capable of destabilizing said colloidal stannous chloride for a time sufficient to substantially remove said colloidal stannous chloride from said planar area while preserving said colloidal stannous chloride upon the wall of said through hole, said solution being an aqueous solution of basic lead carbonate and hydrochloric acid, and d. contacting said resulting resinous sheet material with a solution of a noble metal salt capable of rendering the wall of said through hole catalytic to the deposition of electroless metal.
Claim 2
Dependent Claim
59 words
An improved process according to claim 1 wherein said solution comprises an aqueous solution of basic lead carbonate and hydrochloric acid comprising about 1 to 10 grams of basic lead carbonate and about 1 to 10 ml. of hydrochloric acid per liter of water, and said resinous sheet material is exposed to said solution for 1 to 10 minutes.
Claim 3
Dependent Claim
171 words
an area defined by the walls of at least one through hole which penetrates said resinous sheet material having a substantial tendency to retain an adsorbed colloid, b. contacting said surface of said resinous sheet material with a colloidal suspension of stannous chloride and a noble metal wherein said surface is coated with a colloidal coating of a noble metal which is catalytic to the electroless deposition of metal, and c. contacting said resinous sheet material bearing said colloidal coating with a solution of an organic compound capable of destabilizing said noble metal by reaction therewith for a time sufficient to substantially render said planar area noncatalytic to the electroless deposition of metal through the removal of said noble metal while preserving said noble metal upon the walls of said through holes, said organic compound solution being an aqueous oxalic aciD solution formed by dissolving about 2 to 50 grams of oxalic acid per liter of water, and said exposure to said solution ranging from about 20 seconds to 5 minutes.
Claim 4
Dependent Claim
132 words
an area defined by the walls of at least one through hole which penetrates said resinous sheet material having a substantial tendency to retain an adsorbed colloid, b. contacting said surface of said resinous sheet material with a colloidal suspension of stannous chloride and a noble metal salt wherein said surface is coated with a colloidal coating of a noble metal which is catalytic to the electroless deposition of metal, and c. contacting said resinous sheet material bearing said colloidal coating with a solution of a dioxime capable of destabilizing said noble metal by reaction therewith for a time sufficient to substantially render said planar area noncatalytic to the electroless deposition of metal through the removal of said noble metal while preserving said noble metal upon the walls of said through hole.
Claim 5
Dependent Claim
132 words
an area defined by the walls of at least one through hole which penetrates said resinous sheet material having a substantial tendency to retain an adsorbed colloid, b. contacting said surface of said resinous sheet material with a colloidal suspension of stannous chloride and a noble metal salt wherein said surface is coated with a colloidal coating of a noble metal which is catalytic to the electroless deposition of metal, and c. contacting said resinous sheet material bearing said colloidal coating with a solution of anthranilic acid capable of destabilizing said noble metal by reaction therewith for a time sufficient to substantially render said planar area noncatalytic to the electroless deposition of metal through the removal of said noble metal while preserving said noble metal upon the walls of said through hole.
Claim 6
Dependent Claim
132 words
an area defined by the walls of at least one through hole which penetrates said resinous sheet material having a substantial tendency to retain an adsorbed colloid, b. contacting said surface of said resinous sheet material with a colloidal suspension of stannous chloride and a noble metal salt wherein said surface is coated with a colloidal coating of a noble metal which is catalytic to the electroless deposition of metal, and c. contacting said resinous sheet material bearing said colloidal coating with a solution of 8 -hydroxyquinoline capable of destabilizing said noble metal by reaction therewith for a time sufficient to substantially render said planar area noncatalytic to the electroless deposition of metal through the removal of said noble metal while preserving said noble metal upon the walls of said through hole.
Claim 7
Dependent Claim
171 words
an area defined by the walls of at least one through hole which penetrates said resinous sheet material having a substantial tendency to retain an adsorbed colloid, b. contacting said surface of said resinous sheet material with a colloidal suspension of stannous chloride and a noble metal salt wherein said surface is coated with a colloidal coating of a noble metal which is catalytic to the electroless deposition of metal, c. contacting said resinous sheet material bearing said colloidal coating with a solution of an organic compound capable of destabilizing said noble metal by reaction therewith for a time sufficient to substantially render said planar area noncatalytic to the electroless deposition of metal through the removal of said noble metal while preserving said noble metal upon the walls of said through hole, and d. contacting said resinous sheet material with an aqueous hydrochloric acid solution containing a minor amount of dissolved sodium chloride following contact with said solution of an organic compound capable of destabilizing said noble metal by reaction therewith.
Claim 8
Dependent Claim
147 words
an area defined by the wall of at least one through hole which penetrates said resinous sheet material having a substantial tendency to retain an adsorbed colloid, b. contacting the surface of said resinous sheet material with a colloidal suspension of stannous chloride wherein said surface is coated with colloidal stannous chloride, c. contacting said resinous sheet material bearing said coating of colloidal stannous chloride with a solution of an electrolyte capable of destabilizing said colloidal stannous chloride for a time sufficient to substantially remove said colloidal stannous chloride from said planar area while preserving said colloidal stannous chloride upon the wall of said through hole, said solution being an aqueous solution of ferric chloride, and d. contacting said resulting resinous sheet material with a solution of a noble metal salt capable of rendering the wall of said through hole catalytic to the deposition of electroless metal.
Claim 9
Dependent Claim
147 words
an area defined by the wall of at least one through hole which penetrates said resinous sheet material having a substantial tendency to retain an adsorbed colloid, b. contacting the surface of said resinous sheet material with a colloidal suspension of stannous chloride wherein said surface is coated with colloidal stannous chloride, c. contacting said resinous sheet material bearing said coating of colloidal stannous chloride with a solution of an electrolyte capable of destabilizing said colloidal stannous chloride for a time sufficient to substantially remove said colloidal stannous chloride from said planar area while preserving said colloidal stannous chloride upon the wall of said througH hole, said solution being an aqueous solution of aluminum sulfate, and d. contacting said resulting resinous sheet material with a solution of a noble metal salt capable of rendering the wall of said through hole catalytic to the deposition of electroless metal.
Claim 10
Dependent Claim
148 words
an area defined by the walls of at least one through hole which penetrates said resinous sheet material having a substantial tendency to retain an adsorbed colloid, b. contacting said surface of said resinous sheet material with a colloidal suspension of stannous chloride and a noble metal salt wherein said surface is coated with a colloidal coating of a noble metal which is catalytic to the electroless deposition of metal, and contacting said resinous sheet material bearing said colloidal coating with a solution of a dibasic carboxylic acid having the general formula where n is a whole number from 1 to about 8, capable of destabilizing said noble metal by reaction therewith for a time sufficient to substantially render said planar area noncatalytic to the electroless deposition of metal through the removal of said noble metal while preserving said noble metal upon the walls of said through hole.
Claim 11
Dependent Claim
132 words
an area defined by the walls of at least one through hole which penetrates said resinous sheet material having a substantial tendency to retain an adsorbed colloid, b. contacting said surface of said resinous sheet material with a colloidal suspension of stannous chloride and a noble metal salt wherein said surface is coated with a colloidal coating of a noble metal which is catalytic to the electroless deposition of metal, and c. contacting said resinous sheet material bearing said colloidal coating with a solution of oxalic acid capable of destabilizing said noble metal by reaction therewith for a time sufficient to substantially render said planar area noncatalytic to the electroless deposition of metal through the removal of said noble metal while preserving said noble metal upon the walls of said through hole.
Claim 12
Dependent Claim
42 words
An improved process for the preparation of a resinous sheet material to receive a metal coating over a selected area of its surface through electroless deposition comprising: a. providing a resinous sheet material having areas of divergent surface characteristics consisting essentially of:
Claim 13
Dependent Claim
42 words
An improved process for the preparation of a resinous sheet material to receive a metal coating over a selected area of its surface through electroless deposition comprising: a. providing a resinous sheet material having areas of divergent surface characteristics consisting essentially of:
Claim 14
Dependent Claim
12 words
An improved process according to claim 4 wherein said dioxime is diacetyldioxime.
Claim 15
Dependent Claim
41 words
An improved process for the preparation of a resinous material to receive a metal coating over a selected area of its surface through electroless deposition comprising: a. providing a resinous sheet material having areas of divergent surface characteristics consisting essentially of:
Claim 16
Dependent Claim
42 words
An improved process for the preparation of a resinous sheet material to receive a metal coating over a selected area of its surface through electroless deposition comprising: a. providing a resinous sheet material having areas of divergent surface characteristics consisting essentially of:
Claim 17
Dependent Claim
42 words
An improved process for the preparation of a resinous sheet material to receive a metal coating over a selected area of its surface through electroless deposition comprising: a. providing a resinous sheet material having areas of divergent surface characteristics consisting essentially of:
Claim 18
Dependent Claim
42 words
An improved process for the preparation of a resinous sheet material to receive a metal coating over a selected area of its surface through electroless deposition comprising: a. providing a resinous sheet material having areas of divergent surface characteristics consisting essentially of:
Claim 19
Dependent Claim
42 words
An improved process for the preparation of a resinous sheet material to receive a metal coating over a selected area of its surface through electroless deposition comprising: a. providing a resinous sheet material having areas of divergent surface characteristics consisting essentially of:
Claim 20
Dependent Claim
42 words
An improved process for the preparation of a resinous sheet material to receive a metal coating over a selected area of its surface through electroless deposition comprising: a. providing a resinous sheet material having areas of divergent surface characteristics consisting essentially of:
Claim 21
Dependent Claim
42 words
An improved process for the preparation of a resinous sheet material to receive a metal coating over a selected area of its surface through electroless deposition comprising: a. providing a resinous sheet material having areas of divergent surface characteristics consisting essentially of:
References Cited (Backward Citations)
US3347724A
Cited
US3406036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |