US3953214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photopolymerizable screen printing inks and use thereof
Assignee: MacDermid Inc
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Filing: 1974-05-24
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Granted: 1976-04-27
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Expires: 1994-05-24
Abstract
Abstract Photopolymerizable screen printing inks comprising a hydroxyalkyl acrylate-type monomeric material, a polyester binder and a free-radical initiating system, such inks having a viscosity of from 5,000 to 200,000 centipoises, an acid number of from 0 to 120 and a thixotropic index of from 1 to 4. The process of using such inks to treat substrates, such as in making printed circuits, which includes the steps of screen printing the photopolymerizable ink on the substrate; exposing the ink to actinic radiation to cure the ink and to form a resist; and permanently modifying the exposed areas on the substrate. The resist may thereafter be removed by dissolving in aqueous dilute alkali or an organic solvent.
Inventors
- 👤 Melvin A. Lipson
- 👤 Dale W. Knoth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:35
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; H; H05; H05K; H05K3/00; H05K3/0073; H05K3/0076; H05K3/02; H05K3/06; H05K3/061; H05K3/064; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/109; Y10S430/114; Y10S430/117
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A photopolymerizable screen printing ink which comprises: A. 25 to 50% by weight of a photopolymerizable monomeric material containing at least 20 weight percent hydroxyalkyl acrylate or methacrylate; B. 20 to 60% by weight of a polyester binder having a molecular weight of from 500 to 50,000; C. 5 to 10% by weight of a free radical generating addition polymerizing initiating system; said photopolymerizable composition having a viscosity of from 5,000 to 200,000 centipoises, an acid number of from 0 to 120, and a thixotropic index of from 1.00 to 4.00.
Claim 2
Dependent Claim
91 words
A photopolymerizable screen printing ink which comprises: A. 25 to 50% by weight of a photopolymerizable monomeric material containing at least 20 weight percent hydroxyalkyl acrylate or methacrylate; B. 20 to 60% by weight of a polyester binder having a molecular weight of from 500 to 50,000; C. 5 to 10% by weight of a free radical generating addition polymerizing initiating system; said photopolymerizable composition having a viscosity of from 5,000 to 200,000 centipoises, an acid number of from 0 to 120, and a thixotropic index of from 1.00 to 4.00.
Claim 3
Dependent Claim
20 words
The screen printing ink of claim 1 wherein the photopolymerizable monomeric material consists essentially of a hydroxyalkyl acrylate or methacrylate.
Claim 4
Dependent Claim
21 words
The screen printing ink of claim 1 wherein the polyester binder is a condensation product of propylene glycol and phthalic anhydride.
Claim 5
Dependent Claim
29 words
The screen printing ink of claim 1 wherein the polyester binder is a condensation product of propylene glycol and a 1 to 1 mixture of maleic and isophthalic acids.
Claim 6
Dependent Claim
15 words
The screen printing ink of claim 1 wherein the initiating system contains a benzoin ether.
Claim 7
Dependent Claim
34 words
The screen printing ink of claim 1 wherein the ink contains up to ten parts by weight, based on 100 parts of ink, of a carboxylic acid containing from 2 to 36 carbon atoms.
Claim 8
Dependent Claim
30 words
The screen printing ink of claim 1 wherein the ink contains a maximum of 50 weight percent of a polyfunctional acrylate or methacrylate as part of the photopolymerizable monomeric material.
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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |