| abstract |
Single layer anti-reflective hard-coat; in particular which comprises a structured surface, preferably a nano-structured surface. The hard-coat preferably a hardness above 0.5 GPa, more preferably above 0.7 GPa and most preferably above 1.0 GPa as measured by nano-indentation and/or a reduced tensile modulus above 3 GPa, more preferably above 8.5 GPa or 20 GPa, most preferably above 40 GPa as measured by nano-indentation and/or a scratch resistance above 5 mJ µm-3, preferably above 15 or 30 mJ µm-3, preferably above 60 mJ µm-3 as measured by nano-indentation, and/or contains an amount of inorganic nano-particles from 5 to 75 weight %, preferably from 15 to 50 weight % relative to the weight of the second material present in the hard-coat. Preferably, the hard-coat exhibits a refractive index gradient normal to the substrate over a spatial length scale. A process for preparing a single layer hard-coat, comprising the steps of a) applying a mixture on a substrate, which mixture comprises i. at least a first material which does not crosslink under the conditions chosen in step b) ii. at least a second material which does crosslink under the conditions chosen in step b) iii. nano-particles, and iv. optionally at least one solvent, b) inducing crosslinking in the mixture applied to the substrate, v. subsequently removing at least part of the first material. |