Durable antireflective film

1. An antireflective film comprising

a surface layer comprising the reaction product of a polymerizable low refractive index composition comprising

at least one fluorinated free-radically polymerizable material, and

surface modified inorganic nanoparticles;

a high refractive index layer coupled to the low refractive index layer, wherein the high refractive index layer comprises surface modified inorganic nanoparticles dispersed in a crosslinked organic material;

wherein the antireflective film has an average reflectance of less than 3% for wavelength ranging from 450 nm to 650 nm and a haze of less than 1.0% after 25 wipes with steel wool using a 3.2 cm mandrel and a mass of 1000 grams.

2. The antireflective film of claim 1 wherein the antireflective film surface has an advancing contact angle with hexadecane of at least 45 degrees.

3. The antireflective film of claim 1 wherein the high refractive index layer has a thickness of about 1 micron to about 10 microns.

4. The antireflective film of claim 1 wherein the antireflective film is free of additional hardcoat layers.

5. The antireflective film of claim 1 wherein the low refractive index layer is substantially free of inorganic particles having a diameter of greater than 1 micron.

6. The antireflective film of claim 1 wherein the fluorinated free-radically polymerizable material has a fluorine content of at least 25 wt-%.

7. The antireflective film of claim 6 wherein the amount of free-radically polymerizable material having a fluorine content of at least 25 wt-% is at least 25 wt-% of the polymerizable low refractive index composition.

8. The antireflective film of claim 1 wherein the fluorinated free-radically polymerizable material is multi-functional.

9. The antireflective film of claim 1 wherein the fluorinated free-radically polymerizable material comprises a fluoropolymer.

10. The antireflective film of claim 1 wherein the low refractive index layer composition comprises at least one non-fluorinated crosslinker having at least three (meth)acrylate groups.

11. The antireflective film of claim 1 wherein the low refractive index polymerizable composition further comprises at least one monofunctional HFPO-fluoropolyether, at least one multifunctional HFPO-fluoropolyether, and mixtures thereof

12. The antireflective film of claim 1 wherein the high refractive index layer comprises at least 5 vol-% surface modified zirconia.

13. The antireflective film of claim 1 wherein the high refractive index layer comprises at least 15 vol-% to 40 vol-% of surface modified zirconia.

14. The antireflective film of claim 1 wherein the surface modified particles comprise free-radically polymerizable groups selected from acryl groups, methacryl group, and vinyl groups.

15. The antireflective film of claim 1 wherein the high refractive index layer is coupled to a light transmissive substrate.

16. The antireflective film of claim 15 wherein the substrate comprises a primed layer having a refractive index that differs from the substrate by less than 0.02 and comprises inorganic oxide nanoparticles having a refractive index of at least 1.60.

17. The antireflective film of claim 16 wherein the inorganic oxide nanoparticles are antistatic particles.

18. The antireflective film of claim 1 wherein the antireflective film comprises a single low refractive index layer.

19. The antireflective film or claim 1 wherein the low refractive index composition comprises at least one amino organosilane ester coupling agent or condensation product thereof.

20. An optical device comprising the antireflective film of claim 1 .