Photopolymerizable composition containing hydroxy acrylate...

Details Photopolymerizable composition containing hydroxy acrylate... Photopolymerizable composition containing hydroxy acrylate...

G - Physics

03

C

96/177, 96/86, 2

G03C 5/00 (2006.01) H05K 3/00 (2006.01) H05K 3/06 (2006.01)

Patent

CA 1069371

ABSTRACT OF THE DISCLOSURE Photopolymerizable screen printing inks comprising a hydroxyalkyl acrylate-type monomeric material, a poly- ester binder and a free-radical initiating system, such inks having a viscosity of from 5,000 to 200,000 centi- poises, 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 photo- polymerizable 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.

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