US4454168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuits prepared from metallized photoadhesive layers
Assignee: EIDP Inc
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Filing: 1982-09-29
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Granted: 1984-06-12
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Expires: 2002-09-29
Abstract
Abstract Process for preparation of printed circuits by applying particulate metal to tacky image areas, optionally removing excess particulate metal, and contacting the metallized image areas with an aqueous solution comprising cations of a plating metal to accomplish a metal-metal ion displacement reaction, the solution being substantially free of any chemical reducing agent for said cations. Preferably the conductive circuit is electroplated or soldered.
Inventors
- 👤 Herbert L. Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:41
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/182; H05K3/185; H05K3/102; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0347; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/09509; H05K2203/00; H05K2203/05; H05K2203/0502; H05K2203/0525; H05K2203/0562; H05K2203/0577; H05K2203/07; H05K2203/0703; H05K2203/073; H05K3/0011; H05K3/0017; H05K3/0023; H05K3/184; H05K3/46; H05K3/4644
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
122 words
A process for the preparation of electrically conductive circuits from an element having tacky and nontacky image areas present in a photoadhesive layer which comprises: (a) applying particulate metal taken from the group consisting of zinc and aluminum to the tacky image areas of the element; (b) optionally removing excess particulate metal; and (c) contacting the metallized element with an aqueous solution at a pH in the range of 8 to 11.7 comprising cations of a plating metal which is more electronegative than said zinc or aluminum particulate metal to accomplish a metal-metal ion displacement reaction and being substantially free of any chemical reducing agent for said cations whereby there is provided a conductivity of at least about 1 to 2 mhos/square.
Claim 2
Dependent Claim
122 words
A process for the preparation of electrically conductive circuits from an element having tacky and nontacky image areas present in a photoadhesive layer which comprises: (a) applying particulate metal taken from the group consisting of zinc and aluminum to the tacky image areas of the element; (b) optionally removing excess particulate metal; and (c) contacting the metallized element with an aqueous solution at a pH in the range of 8 to 11.7 comprising cations of a plating metal which is more electronegative than said zinc or aluminum particulate metal to accomplish a metal-metal ion displacement reaction and being substantially free of any chemical reducing agent for said cations whereby there is provided a conductivity of at least about 1 to 2 mhos/square.
Claim 3
Dependent Claim
32 words
A process according to claim 1 wherein the particulate metal is fixed or bound to the tacky image areas by heating, curing by exposing to actinic radiation, embedding mechanically, and combinations thereof.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein the particulate metal bearing or metal containing image areas are electroplated or soldered.
Claim 5
Dependent Claim
48 words
A process according to claim 1 wherein the photoadhesive layer comprises an addition polymerizable ethylenically unsaturated compound having at least one terminal ethylenic group, (ii) at least one organic polymeric binder compound, and (iii) a free radical generating addition polymerization initiator or initiator system activatable by actinic radiation.
Claim 6
Dependent Claim
21 words
A process according to claim 4 wherein the binder is a combination of methylmethacrylate/styrene/acrylonitrile/butadiene interpolymer and a carboxylated acrylonitrile/butadiene rubber compound.
Claim 7
Dependent Claim
83 words
A process according to claim 1 wherein the element having tacky and nontacky image areas comprises, in order from bottom to top: a support, a tacky nonphotosensitive layer, a photohardenable or photopolymerizable layer, and, optionally, a cover sheet, and after imagewise exposure of said element to actinic radiation and removal of the cover sheet, if present, or liquid development, nontacky, nontonable image areas are present in the photohardened or photopolymerized layer and tacky, tonable image areas are present in the lower nonphotosensitive layer.
Claim 8
Dependent Claim
17 words
A process according to claim 1 wherein the tacky image areas are present as tacky adhesive images.
Claim 9
Dependent Claim
12 words
A process according to claim 1 wherein the particulate metal is zinc.
Claim 10
Dependent Claim
12 words
A process according to claim 1 wherein the particulate metal is aluminum.
Claim 11
Dependent Claim
48 words
A process according to claim 2 wherein the particulate metal is fixed or bound to the tacky image areas by heating in the temperature range of 80° C. to 150° C., for at least 10 seconds, the temperature being below the degradation temperature of the metallized image areas.
Claim 12
Dependent Claim
38 words
A process according to claim 1 wherein the element having tacky and nontacky image areas comprises a flexible support and a dry, tacky photoadhesive layer comprising a photoadhesive composition, optionally including at least one organic elastomeric polymeric binder.
Claim 13
Dependent Claim
19 words
A process according to claim 1 wherein multilayer printed circuits are prepared which includes conductive vias between the layers.
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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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |