Gas separation: apparatus – Solid sorbent apparatus – With programmed – cyclic – or time responsive control means
Patent
1974-05-24
1976-04-27
Klein, David
Gas separation: apparatus
Solid sorbent apparatus
With programmed, cyclic, or time responsive control means
96 351, G03C 168, G03C 500
Patent
active
039532143
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.
REFERENCES:
patent: 2791504 (1957-05-01), Plambeck
patent: 3255006 (1966-06-01), Bailey
patent: 3695877 (1972-10-01), Taneda et al.
patent: 3753720 (1973-08-01), Kloczewski et al.
Knoth Dale W.
Lipson Melvin A.
Dynachem Corporation
Falasco Louis
Klein David
Lewen Bert J.
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