US4601784A
Expired / Lapsed
US
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Sodium permanganate etch baths containing a co-ion for permanganate and their use in desmearing and/or etching printed circuit boards
Assignee: MacDermid Acumen Inc
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Filing: 1985-05-31
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Granted: 1986-07-22
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Expires: 2005-05-31
Abstract
Abstract Aqueous, alkaline liquid NaMnO4 solutions are provided which provide excellent resin desmearing and etchback, especially in the manufacture of printed circuit boards. The solutions comprise water, alkali metal hydroxide, NaMnO4 and from about 0.1 to about 3.0 moles per mole of MnO4- of a co-ion for MnO4- selected from the group consisting of K+, Cs+, Rb+ and mixtures thereof.
Inventors
- 👤 Gerald Krulik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:20
CPC Classifications
C; C09; C09K; C09K13/00; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/22; C08; C08J; C08J7/00; C08J7/12; C09K13/02; C23G; C23G1/00; C23G1/14; H; H05; H05K; H05K3/00; H05K3/0011; H05K3/0055; H05K2203/00; H05K2203/07; H05K2203/0779; H05K2203/0786; H05K2203/0793; H05K2203/0796
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
52 words
An aqueous, alkaline liquid NaMnO 4 solution comprising water alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 - of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
Claim 2
Dependent Claim
52 words
An aqueous, alkaline liquid NaMnO 4 solution comprising water alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 - of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
Claim 3
Dependent Claim
28 words
A solution according to claim 1 wherein the co-ion is present in an amount from about 0.1 to about 1.5 mole per mole of MnO 4 - .
Claim 4
Dependent Claim
13 words
A solution according to claim 1 wherein the co-ion is K + .
Claim 5
Dependent Claim
13 words
A solution according to claim 1 wherein the alkali metal hydroxide is NaOH.
Claim 6
Dependent Claim
28 words
A solution according to claim 1 wherein the alkali metal hydroxide is present in an amount which provides at least about 1 mole of OH-per liter of solution.
Claim 7
Dependent Claim
31 words
A solution according to claim 5 wherein the alkali metal hydroxide is present in an amount which provides from about 1 to about 4 moles of OH- per liter of solution.
Claim 8
Dependent Claim
16 words
A solution according to claim 1 which contains at least about 70 g/l NaMnO 4 .
Claim 9
Dependent Claim
18 words
A solution according to claim 7 which contains about 70 g/l to about 400 g/l NaMnO 4 .
Claim 10
Dependent Claim
37 words
A solution according to claim 1 which contains about 140 g/l of NaMnO 4 , about 4 moles/liter of OH- and about 0.1 to about 1.5 moles of K + per mole of MnO 4 - .
Claim 11
Dependent Claim
67 words
A process for preparing a resinous substrate for subsequent metallization which comprises contacting said substrate with an aqueous, alkaline liquid NaMnO 4 solution comprising water, alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
Claim 12
Dependent Claim
67 words
A process for preparing a resinous substrate for subsequent metallization which comprises contacting said substrate with an aqueous, alkaline liquid NaMnO 4 solution comprising water, alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
Claim 13
Dependent Claim
76 words
An improved process for desmearing resin from the inside walls of holes formed in resinous substrates wherein the improvement comprises contacting the substrate with an aqueous, alkaline liquid NaMnO 4 solution comprising water, alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 - of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
Claim 14
Dependent Claim
76 words
An improved process for desmearing resin from the inside walls of holes formed in resinous substrates wherein the improvement comprises contacting the substrate with an aqueous, alkaline liquid NaMnO 4 solution comprising water, alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 - of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
Claim 15
Dependent Claim
70 words
An improved hole cleaning process for multilayer circuit boards wherein the improvement comprises contacting the multilayer circuit boards with aqueous, alkaline liquid NaMnO 4 solution comprising water, alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 - of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
Claim 16
Dependent Claim
70 words
An improved hole cleaning process for multilayer circuit boards wherein the improvement comprises contacting the multilayer circuit boards with aqueous, alkaline liquid NaMnO 4 solution comprising water, alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 - of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
Claim 17
Dependent Claim
70 words
A process for etching back the surface of a circuit board which comprises contacting the circuit board with an aqueous, alkaline liquid NaMnO 4 solution comprising water, alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 - of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
Claim 18
Dependent Claim
70 words
A process for etching back the surface of a circuit board which comprises contacting the circuit board with an aqueous, alkaline liquid NaMnO 4 solution comprising water, alkali metal hydroxide, NaMnO 4 and from about 0.1 to about 3.0 moles per mole of MnO 4 - of a co-ion for MnO 4 - selected from the group consisting of K + , Cs + , Rb + and mixtures thereof.
References Cited (Backward Citations)
US1969678A
Cited
US2908557A
Cited
US3293148A
Cited
US3489625A
Cited
US3457107A
Cited
US3625758A
Cited
US3425947A
Cited
US3506397A
Cited
US3598630A
Cited
US3647699A
Cited
US3652351A
Cited
US3689303A
Cited
US3833414A
Cited
US4042729A
Cited
GB1479556A
Cited
US4054693A
Cited
US4073740A
Cited
US4294651A
Cited
US4430154A
Cited
US4425380A
Cited
EP0109920A2
Cited
GB2134140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |