US3914128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photohardenable paste compositions having high resolution
Assignee: EIDP Inc
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Filing: 1973-06-08
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Granted: 1975-10-21
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Expires: 1993-06-08
Abstract
Abstract A film-forming photohardenable paste composition comprising solid inorganic particulate material, a photohardenable polymeric or monomeric composition, a nitroso dimer and chromium provides a screen-printable paste composition with improved resolution compatible with thick-film techniques used for fabricating electrically conductive and dielectric patterns and layers on substrates for electronic circuits.
Inventors
- 👤 David Hitz Scheiber
- 👤 Richard Vroman Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:33
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/109; Y10S430/114; Y10S430/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
146 words
A FILM FORMING PHOTOHARDENABLE PASTE COMPOSITION COMPRISING FROM ABOUT 20 TO ABOUT 75 WEIGHT PERCENT OF FINELY DIVIDED INORGANIC MATERIAL CAPABLE ON FIRING OF BEING FUSED INTO AN ELEMENT OF AN ELECTRONIC CIRCUIT, FROM ABOUT 2 TO ABOUT 35 WEIGHT PERCENT OF A POLYMERIC BINDER, NOT MORE THAN ABOUT 10 WEIGHT PERCENT OF A PHOTOPOLYMERIZABLE MONOMER, FROM ABOUT 0.02 TO ABOUT 1 WEIGHT PERCENT OF AN ORGANIC SENSITIZER, FROM ABOUT 20 TO ABOUT 75 WEIGHT PERCENT OF A SOLVENT, FROM ABOUT 0.01 TO ABOUT 1.0 WEIGHT PERCENT OF A NITROSO DIMER HAVING A DISSOCIATION CONSTANT IN SOLUTION AT 25*C. OF FROM ABOUT 10**-2 TO ABOUT 10*10 WITH A RATE OF DISSOCIATION IN SOLUTION WITH A HALF LIFE COMPARABLE TO THE EXPOSURE TIME OF THE PASTE COMPOSITION, AND FROM ABOUT 0.05 TO ABOUT 7.0 WEIGHT PERCENT CHROMIUM PRESENT AT EITHER THE FREE METAL OR AN OXIDE THEREOF.
Claim 2
Dependent Claim
146 words
A FILM FORMING PHOTOHARDENABLE PASTE COMPOSITION COMPRISING FROM ABOUT 20 TO ABOUT 75 WEIGHT PERCENT OF FINELY DIVIDED INORGANIC MATERIAL CAPABLE ON FIRING OF BEING FUSED INTO AN ELEMENT OF AN ELECTRONIC CIRCUIT, FROM ABOUT 2 TO ABOUT 35 WEIGHT PERCENT OF A POLYMERIC BINDER, NOT MORE THAN ABOUT 10 WEIGHT PERCENT OF A PHOTOPOLYMERIZABLE MONOMER, FROM ABOUT 0.02 TO ABOUT 1 WEIGHT PERCENT OF AN ORGANIC SENSITIZER, FROM ABOUT 20 TO ABOUT 75 WEIGHT PERCENT OF A SOLVENT, FROM ABOUT 0.01 TO ABOUT 1.0 WEIGHT PERCENT OF A NITROSO DIMER HAVING A DISSOCIATION CONSTANT IN SOLUTION AT 25*C. OF FROM ABOUT 10**-2 TO ABOUT 10*10 WITH A RATE OF DISSOCIATION IN SOLUTION WITH A HALF LIFE COMPARABLE TO THE EXPOSURE TIME OF THE PASTE COMPOSITION, AND FROM ABOUT 0.05 TO ABOUT 7.0 WEIGHT PERCENT CHROMIUM PRESENT AT EITHER THE FREE METAL OR AN OXIDE THEREOF.
Claim 3
Dependent Claim
15 words
The composition of claim 1 wherein the polymeric binder is a polyacrylate or a polymethacrylate.
Claim 4
Dependent Claim
20 words
The composition of claim 2 wherein the polymeric binder has a molecular weight of from about 200,000 to about 500,000.
Claim 5
Dependent Claim
17 words
A composition according to claim 1, wherein said nitroso dimer is selected from the group consisting of
Claim 6
Dependent Claim
17 words
A composition according to claim 4, wherein said inorganic particulate material is a finely divided noble metal.
Claim 7
Dependent Claim
28 words
A composition according to claim 5 wherein said inorganic particulate is a noble metal selected from the group consisting of gold, silver, palladium and platinum or mixtures thereof.
Claim 8
Dependent Claim
12 words
A composition according to claim 6, wherein said noble metal is gold.
Claim 9
Dependent Claim
12 words
A composition according to claim 6, wherein said noble metal is silver.
Claim 10
Dependent Claim
12 words
A composition according to claim 6, wherein said noble metal is platinum.
Claim 11
Dependent Claim
12 words
A composition according to claim 6, wherein said noble metal is palladium.
Claim 12
Dependent Claim
16 words
A composition according to claim 5, wherein said inorganic particulate material additionally includes a glass frit.
Claim 13
Dependent Claim
15 words
A composition according to claim 5, wherein said inorganic particulate material additionally includes bismuth oxide.
Claim 14
Dependent Claim
15 words
A composition according to claim 3, wherein said inorganic particulate material is a dielectric material.
Claim 15
Dependent Claim
14 words
A composition according to claim 13, wherein said dielectric material is a glass frit.
Claim 16
Dependent Claim
14 words
A composition according to claim 3, wherein said liquid vehicle is a hydrogenated terpene.
Claim 17
Dependent Claim
12 words
A composition according to claim 1, wherein said photopolymerizable monomers are acrylates.
Claim 18
Dependent Claim
13 words
A composition according to claim 1, wherein the polymeric binder is polyisobutyl methacrylate.
Claim 19
Dependent Claim
14 words
A composition according to claim 1, wherein the organic sensitizer is benzoin methyl ether.
Claim 20
Dependent Claim
16 words
A composition according to claim 16, wherein said photopolymerizable monomers are diethyleneglycol diacrylate and tetraethyleneglycol diacrylate.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |