Production of permanent hydrophilic finish on glass substrate - comprises reaction with silane containing hydrophilic organic group and free hydroxyl or alkoxy group reacting with hydroxyl groups on glass surface, reducing dazzle.

Abstract
The process for making glass substrates hydrophilic comprises reacting (i) silane(s) (I) with hydrophilic organic group(s) R' and free hydroxyl (OH) and/or OR group(s) with (ii) the glass substrate to form Si-O-Si linkages between the silane and Si-OH groups of the glass substrate; and selecting the R' group(s) so that the angle of contact between the treated glass substrate and water is < 22 deg. . USE - The treated glass substrates are used e.g. in vehicles (claimed), e.g. as windscreens. ADVANTAGE - The present treatment improves the wiping quality, has high long-term stability and causes little scattering of light. It also prevents drops of dew or rain forming, which otherwise would also reduce visibility.