UV-curable polymer thick film dielectric compositions with excellent adhesion to ITO

1. A screen printable, curable dielectric composition comprising:

a) 25 to 35 wt % finely divided talc particles; and

b) a liquid component comprising:

(1) 20 to 50 wt % acrylated urethane resin oligomer;

(2) 15 to 40 wt % alkyl acrylate; and

(3) 1 to 5 wt % phosphoric acid,

wherein said talc particles are dispersed in said liquid component and wherein the wt % are based on the total weight of said dielectric composition.

2. The dielectric composition of claim 1 , further comprising 0.1 to 10 wt % photoinitiator whereby said dielectric composition is UV curable.

3. The dielectric composition of claim 1 , further comprising 0.1 to 2.0 wt % of a printing aid.

4. The dielectric composition of claim 1 wherein the amount of phosphoric acid is 1.5 to 2.5 wt %.

5. The dielectric composition of claim 1 , wherein the amount of phosphoric acid is about 2 wt %.

6. The dielectric composition of claim 1 , wherein the amount of acrylated urethane resin oligomer is 30 to 40 wt %.

7. The dielectric composition of claim 1 , wherein the amount of alkyl acrylate is 20 to 30 wt %.

8. A touch screen display comprising a dielectric on an ITO or metal oxide substrate, said dielectric consisting of the cured dielectric composition of claim 1 .

9. A touch screen display comprising a dielectric on an ITO or metal oxide substrate, said dielectric consisting of the cured dielectric composition of claim 2 .

10. A thin-film photovoltaic cell comprising a dielectric on an ITO or metal oxide substrate, said dielectric consisting of the cured dielectric composition of claim 1 .

11. A thin-film photovoltaic cell comprising a dielectric on an ITO or metal oxide substrate, said dielectric consisting of the cured dielectric composition of claim 2 .