Process for Preparing Articles Having Anti-Fog Layer by Layer Coating and Coated Articles Having Enhanced Anti-Fog and Durability Properties

A process for preparing an article having anti-fog properties, comprising:

• a) providing a substrate having at least one main surface coated with an intermediate coating obtained by applying and at least partially curing an intermediate coating composition comprising at least one monoepoxysilane and/or an hydrolyzate thereof and at least one polyepoxy monomer comprising at least two epoxy groups;
• b) forming onto said intermediate coating at least one bi-layer obtained by:
• b1—forming a first layer by applying a first layer composition on said intermediate coating, said first layer composition comprising at least one compound A having a first electric charge,
• b2—forming a second layer by applying a second layer composition directly on said first layer, said second layer composition comprising at least one compound B having a second electric charge which is opposite to said first electric charge,
• compounds A and B being independently chosen from polyelectrolytes, SiO2 nanoparticles comprising ionic groups and TiO2 nanoparticles comprising ionic groups, with the proviso that at least one of said first and said second layer comprises SiO2 nanoparticles comprising ionic groups and/or TiO2 nanoparticles comprising ionic groups;
• and
• c) curing said at least one bi-layer by heating at a temperature of 150° C. or less, at atmospheric pressure and in the absence of added water steam.