Screen printing of photopolymerizable inks

Details Screen printing of photopolymerizable inks Screen printing of photopolymerizable inks

1979-04-12

1981-06-02

Hess, Bruce H.

Chemistry: electrical and wave energy

Processes and products

156656, 1566591, 204 38E, 20415919, 427 44, 427272, 427275, 427282, 427304, 427307, 427259, 427264, 427 531, B05D 306

Patent

active

042709857

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: 3037896 (1962-06-01), Gauntt
patent: 3255006 (1966-06-01), Bailey
patent: 3424597 (1969-01-01), Shipley
patent: 3448516 (1969-06-01), Buck
patent: 3469982 (1969-09-01), Celeste
patent: 3510340 (1970-05-01), Blake
patent: 3673135 (1972-06-01), Blake
patent: 3695877 (1972-10-01), Taneda
patent: 3713864 (1973-01-01), Ackerman
patent: 3753720 (1973-08-01), Kloczewski
patent: 3953309 (1976-04-01), Galiano

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