Patent ID: 7842339

Claim:
A method of making adherent and wipe-resistant porous SiO 2 -containing antireflection coatings on borosilicate glass bodies, said method comprising the steps of: a) providing a borosilicate glass body to be coated, said borosilicate glass body with a composition, in percent by weight based on oxide content, consisting of SiO 2 , 70 to 75; B 2 O 3 , 8 to 11; Al 2 O 3 , 5 to 9; alkali metal oxides, 7 to 12; and alkaline earth metal oxides, 0 to 10; b) wetting said borosilicate glass body to be coated with a coating solution consisting of from 1.0 to 6.0 wt. % of HCl, from 0.5 to 7.0 wt. % of a SiO 2 sol based on solids content, from 0.5 to 5.0 wt. % of water, and from 85 to 98 wt. % of at least one volatile water-soluble organic solvent, to form an antireflection coating on the borosilicate glass body; and then c) drying and burning in the antireflection coating formed on the borosilicate glass body in step b) at a temperature of about 450° C. to 35° C. above a glass transformation temperature Tg of the glass body.