US5508141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autodeposition emulsion and methods of using thereof to selectively protect metallic surfaces
Assignee: MacDermid Acumen Inc
•
Filing: 1994-12-02
•
Granted: 1996-04-16
•
Expires: 2014-12-02
Abstract
Abstract A coating of resin and photoactive functionality is autodeposited from an emulsion onto a metallic substrate in order to selectively protect the substrate from corrosive environments such as etchant processes. An acid and oxidizing agent are included in the emulsion so that when the substrate is immersed in the emulsion the resin and photoactive functionality autodeposits. The resulting coating can be exposed to actinic radiation in an image-wise fashion and developed in an alkaline solution to develop the image created. In instances where the emulsion and process are used to make circuit boards, the metallic surface uncovered during developing is then etched away, leaving only the coated sections of the surface. The resulting coated surfaces will be the circuit traces of the circuit board.
Inventors
- 👤 Daniel J. Hart
- 👤 Alan F. Becknell
- 👤 Betsy Elzufon
- 👤 John S. Hallock
- 👤 Alan R. Browne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:35
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/16; B; B05; B05D; B05D7/00; B05D7/14; B05D7/142; H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; H05K3/064; B05D3/00; B05D3/06; B05D3/061; B05D3/065; B05D3/067; B05D7/144; H05K2203/00; H05K2203/07; H05K2203/0756; H05K2203/0759; H05K2203/0779; H05K2203/0786; H05K2203/0796
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
An aqueous, acidic, autodepositable photoresist emulsion having a pH of from about 1 to about 5 and capable of autodepositing a coating on a metal surface and having the capability of being developed by an aqueous alkali solution to form an image on the metal surface, wherein said emulsion comprises: (i) a resin, (ii) a positive-acting photoactive functionality, (iii) an acid, (iv) an oxidizing agent, and (v) a surfactant, wherein components (i)-(v) are present in amounts sufficient to induce a coating (i) of resin and functionality (ii) on a metal surface which is in contact with said emulsion.
Claim 2
Dependent Claim
98 words
An aqueous, acidic, autodepositable photoresist emulsion having a pH of from about 1 to about 5 and capable of autodepositing a coating on a metal surface and having the capability of being developed by an aqueous alkali solution to form an image on the metal surface, wherein said emulsion comprises: (i) a resin, (ii) a positive-acting photoactive functionality, (iii) an acid, (iv) an oxidizing agent, and (v) a surfactant, wherein components (i)-(v) are present in amounts sufficient to induce a coating (i) of resin and functionality (ii) on a metal surface which is in contact with said emulsion.
Claim 3
Dependent Claim
12 words
An emulsion according to claim 1, wherein the resin is a novolak.
Claim 4
Dependent Claim
36 words
An emulsion according to claim 1 wherein the positive acting functionality is a member of the group consisting of polyoxymethylene, o-nitrocarbinol esters, o-nitrophenyl acetals and corresponding esters, benzoquinone diazide sulphonic esters, and naphthoquinone diazide sulphonic esters.
Claim 5
Dependent Claim
34 words
An emulsion according to claim 1 wherein the positive acting functionality is o-nitrocarbinol ester and wherein the resin is an emulsion polymerization copolymer product of said o-nitrocarbinol ester with methyl methacrylate and acrylic acid.
Claim 6
Dependent Claim
31 words
An emulsion according to claim 1 wherein the positive acting functionality is o-nitrocarbinol ester and wherein the resin is an emulsion polymerization copolymer product of said o-nitrocarbinol ester with vinylidene chloride.
Claim 7
Dependent Claim
40 words
An emulsion according to claim 1 wherein the positive acting functionality is a 2-diazo-1-naphthoquinone sulfonate triester of 2,3,4-trihydroxy benzophenone and the resin is a novolak and wherein the positive acting functionality and resin are emulsified together as chemically separate components.
Claim 8
Dependent Claim
19 words
An emulsion according to claim 1 wherein the positive acting functionality is 2-diazo-1-naphthoquinone sulfonate ester of a novolak resin.
Claim 9
Dependent Claim
25 words
An emulsion according to claim 1 wherein acid (iii) is a member of the group consisting of hydrochloric, hydrofluoric, acetic, phosphoric, sulfuric and citric acids.
Claim 10
Dependent Claim
13 words
An emulsion according to claim 1 wherein the oxidizing agent is hydrogen peroxide.
Claim 11
Dependent Claim
111 words
An aqueous, acidic, autodepositable photoresist emulsion having a pH of from about 1 to about 5 and capable of autodepositing a coating on a metal surface and having the capability of being developed by an aqueous alkali solution to form an image on the metal surface, wherein said emulsion comprises: (i) a styrerie/acrylic acid copolymer resin, (ii) a C 14 -C 16 alkane diol diacrylate negative-acting photoactive functionality and a photoinitiator, (iii) an acid, (iv) an oxidizing agent, and (v) a surfactant, wherein components (i)-(v) are present in amounts sufficient to induce a coating (i) of resin and functionality (ii) on a metal surface which is in contact with said emulsion.
Claim 12
Dependent Claim
111 words
An aqueous, acidic, autodepositable photoresist emulsion having a pH of from about 1 to about 5 and capable of autodepositing a coating on a metal surface and having the capability of being developed by an aqueous alkali solution to form an image on the metal surface, wherein said emulsion comprises: (i) a styrerie/acrylic acid copolymer resin, (ii) a C 14 -C 16 alkane diol diacrylate negative-acting photoactive functionality and a photoinitiator, (iii) an acid, (iv) an oxidizing agent, and (v) a surfactant, wherein components (i)-(v) are present in amounts sufficient to induce a coating (i) of resin and functionality (ii) on a metal surface which is in contact with said emulsion.
References Cited (Backward Citations)
US4347172A
Cited
US3873349A
Cited
US3954587A
Cited
US4012351A
Cited
US4103049A
Cited
US4040925A
Cited
US4214022A
Cited
US4215162A
Cited
US4186219A
Cited
US4637839A
Cited
US4177180A
Cited
US4191676A
Cited
US4199488A
Cited
US4411950A
Cited
US4366195A
Cited
US4313983A
Cited
US4758621A
Cited
US4994521A
Cited
US4313861A
Cited
US4310450A
Cited
US4517281A
Cited
US5352726A
Cited
US4632900A
Cited
EP0194824A2
Cited
US4578419A
Cited
US4554305A
Cited
US4981887A
Cited
US5045435A
Cited
US5011715A
Cited
US5013631A
Cited
US5232815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-16 | 1999-10-16 | 2000-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-16 | 2003-10-16 | 2004-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-16 | 2007-10-16 | 2008-04-16 | $7700.00 | Window Closed / Lapsed |