Process for making an abrasion resistant coating onto an organic glass substrate

A process for making an abrasion-resistant coating onto at least one surface of a substrate made of an organic glass which comprises:

• (a) preparing a polymerizable composition containing a component A comprising at least one silane compound containing at least one epoxy group and at least two alkoxy groups directly bonded to the Si atom of the molecule or a hydrolysate thereof and a component B comprising fine particles of silica, an effective amount of at least one cationic photopolymerization initiator and an effective amount of at least one thermal polymerization catalyst;
• (b) coating at least one surface of the substrate with the composition resulting from step (a);
• (c) submitting the coated substrate to a photopolymerization step for pre-curing the coating layer;
• and thereafter;
• (d) submitting the substrate with the pre-cured coating layer thereon to a thermal curing at a predetermined temperature and for a predetermined time to complete curing of the coating layer.