U.S. 8,101,673 B2
Bayer MaterialScience AG has been obtained a patent for a UV-crosslinkable composition comprised of  unmodified, protonated silica nanoparticles; a urethane acrylate; a polar solvent; and a UV initiator system, wherein the amount by weight of the unmodified, protonated silica nanoparticles exceeds the amount by weight of the urethane acrylate and is present in an amount of at least 50.1% weight, based on the total dry weight of the composition.