Epoxy-based uv-vis-curable compositions

Abstract

The invention relates to A UV-VIS-curable composition comprising: a) about 20 to about 40 wt.% of at least one aromatic epoxide component, wherein the epoxy functionality is between 2 to 3; b) about 30 to about 50 wt.% of at least one cycloaliphatic epoxide component, b) being different than a); c) about 2 to about 20 wt.% of at least one ester-containing component; d) about 2 to about 12 wt.% of at least one fluorine-based component; e) about 1 to about 15 wt.% of at least one cationic photoinitiator, f) more than about 3 wt.% of at least one additive selected from the group consisting of surfactants and adhesion promoters or mixtures thereof, g) 0 to 5 wt.% of at least one photosensitizer, and wherein the composition has a Tg-value of less than 100 °C and a viscosity between about 1000 m-Pas to about 4000 m.Pas at 25 °C, wherein the weight percents are based on the total weight of the UV-VIS-curable composition. The invention further relates to an inkjet printhead comprising said composition and a method of coating a silicon substrate, preferably a silicon wafer, with said UV-VIS-curable composition.