| abstract |
(57) [PROBLEMS] To form a hydrophilic film capable of imparting anti-fogging property and stain prevention ability by making the surface of various substrates hydrophilic without using a photocatalyst. SOLUTION: A siliceous coating having a sulfonic acid group is provided. Coating and drying a solution containing a partial hydrolyzate of alkoxysilane having at least a part of this functional group or its precursor group (eg, sulfonic acid ester, thiol, sulfide group), and optionally from the precursor group to the functional group Is formed on the substrate surface by a chemical reaction for the change of |