Patent ID: 8097341

Claim:
A coated glass body comprising a borosilicate glass body and a wipe-proof porous phosphorus-free SiO 2 -containing antireflection layer on said borosilicate glass body, said borosilicate glass body having a composition, in weight percent on an oxide basis, comprising: SiO 2 63-76, B 2 O 3 >11-20, Al 2 O 3 1-9, at least one alkali metal oxide 3-12, at least one alkaline earth oxide 0-10, ZnO 0-2, TiO 2 0-5, ZrO 2 0-1, Nb 2 O 5 0-1, WO 3 0-1; said coated glass body being produced by a process comprising the steps of: a) providing said borosilicate glass body having said composition; b) providing a coating solution containing 1.0 to 6.0 percent by weight of HCl, 0.5 to 7.0 percent by weight of SiO 2 sol (solids content), 0.5 to 5 percent by weight of water, and 85 to 98 percent by weight of a readily volatile water-soluble organic solvent; c) wetting said borosilicate glass body with said composition according to step a) with said coating solution according to step b); and d) drying and baking said borosilicate glass body wet with said coating solution according to step c) to form the wipe-proof porous phosphorus-free SiO 2 -containing antireflection layer.