Screen printing of photopolymerizable inks
US4270985A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1979 |
| Grant date | Jun 2, 1981 |
| Priority date | — |
| Expiry date | Apr 12, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S522/909
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.