US3776729A
Expired / Lapsed
US
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Photosensitive dielectric composition and process of using the same
Assignee: International Business Machines Corp
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Filing: 1971-02-22
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Granted: 1973-12-04
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Expires: 1991-02-22
Abstract
Abstract A photosensitive dielectric composition comprising a first polymer system formed by the photopolymerization of a multifunctional vinyl monomer, e.g., pentaerythritol tetraacrylate, in the presence of a partially cured second polymer system. The first polymer system occludes therein the second polymer system which has been finally cured, i.e., cross-linked by an ionic mechanism, subsequent to the polymerization of the first polymer system, e.g., the second polymer system can be an epoxy resin. One process for forming the above composition comprises applying a solution of pentaerythritol tetraacrylate monomer, a photosensitizer, the epoxy resin cured to the B-stage and a curing agent for the epoxy resin onto a support, selectively exposing the same to radiation to polymerize the tetraacrylate monomer, washing the same in an appropriate solvent to remove the components in areas unexposed to light and baking the assembly to cross-link the epoxy resin which is occluded within the tetraacrylate polymer.
Inventors
- 👤 M Levy
- 👤 G Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:33
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/115; Y10S430/117; Y10S430/128
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
29 words
The composition of claim 1 wherein the multifunctional vinyl monomer system and the cross-linkable polymer system are each present in an amount of 45 to 55 percent by weight.
Claim 2
Dependent Claim
42 words
The composition of claim 2 wherein the cross-linkable polymer system contains an epoxy selected from the group consisting of a bisphenol-A based epoxy resin, an epoxy-novolac resin and mixtures thereof, cured to the B-stage, said bisphenol-A based epoxy resin having the formula:
Claim 3
Dependent Claim
25 words
The composition of claim 3 wherein up to 95 percent by weight of the epoxy resin is replaced by a phenoxy resin, of the formula:
Claim 4
Dependent Claim
30 words
The composition of claim 4 wherein the multifunctional vinyl monomer system comprises at least 60 percent by weight of at least one multi-functional vinyl monomer which has the general formula:
Claim 5
Dependent Claim
42 words
The composition of claim 5 wherein said one R group is selected from the group consisting of a methacrylate group, a fatty acid group with up to 18 carbon atoms and an aliphatic carboxylic acid group with up to 18 carbon atoms.
Claim 6
Dependent Claim
53 words
The composition of claim 1 wherein said photosensitizing agent is present in an amount of from 3 to 6 weight percent and is selected from the group consisting of a substituted quinone, an unsubstituted quinone, wherein the carbonyl group is attached directly to the conjugated central ring of said quinone, and ketaldonyl compounds.
Claim 7
Dependent Claim
21 words
The composition of claim 1 wherein said curing agent is selected from the group consisting of anhydride curing agents and dicyandiamide.
Claim 8
Dependent Claim
195 words
A process for selectively forming a dielectric layer comprising forming a composition comprising: a. a multi-functional vinyl monomer system comprising at least one photopolymerizable multi-functional vinyl monomer, b. a latent photosensitizing agent which will initiate the photopolymerization of the multi-functional vinyl monomer system upon exposure to actinic radiation, c. a cross-linkable polymer system comprising a cross-linkable polymer cured to an intermediate stage of cure, said cross-linkable polymer system not being substantially cured or further polymerized on exposure to actinic radiation, d. a latent, thermally initiated curing agent for said cross-linkable polymer system, and e. an inert solvent for all components; coating the composition onto a substrate, heating the composition to remove the solvent from the composition, selectively exposing the composition to actinic radiation, whereby the at least one multi-functional vinyl monomer is polymerized in the areas exposed to light but remains in monomeric form in areas unexposed to light; removing the composition in areas unexposed to actinic radiation by dissolving the unexposed areas with solvent; and thermally advancing the cure of said cross-linkable polymer which is initially at an intermediate stage of cure while said cross-linkable polymer is occluded within said photopolymerized multi-functional vinyl monomer.
Claim 9
Dependent Claim
29 words
The process of claim 9 wherein said multi-functional vinyl monomer system and the cross-linkable polymer system are each present in an amount of 45 to 55 percent, by weight.
Claim 10
Dependent Claim
43 words
The process of claim 10 wherein the cross-linkable polymer system contains an epoxy resin selected from the group consisTing of a bisphenol-A based epoxy resin, an epoxy-novolac resin and mixtures thereof, cured to the B-stage, said bisphenol-A based epoxy resin having the formula:
Claim 11
Dependent Claim
25 words
The process of claim 11 wherein up to 95 percent by weight of the epoxy resin is replaced by a phenoxy resin, of the formula:
Claim 12
Dependent Claim
30 words
The process of claim 12 wherein the multi-functional vinyl monomer system comprises at least 60 percent by weight of at least one multi-functional vinyl monomer which has the general formula:
Claim 13
Dependent Claim
22 words
The process of claim 9 further comprising drying prior to thermally advancing the cure of the cross-linkable polymer to thereby remove volatiles.
Claim 14
Dependent Claim
12 words
A dielectric composition comprising the product of the process of claim 9.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |