Method for preparing optical articles with multi-layer antireflective coatings

A method for preparing a coated optical article comprising:

• (a) providing a non-conductive substrate;
• (b) forming at least one conductive coating layer over at least a portion of the substrate to form a conductive substrate;
• (c) introducing the conductive substrate of (b) into a first electrodeposition bath containing a first electrodepositable coating composition under constant recirculation flow at a substantially uniform flow rate;
• (d) electrodepositing the first electrodepositable coating composition over at least a portion of the conductive coating layer to form a first electrodeposited inorganic coating layer;
• (e) introducing the coated substrate of (d) into at least a second electrodeposition bath containing a second electrodepositable coating composition under constant recirculation flow at a substantially uniform flow rate;
• and
• (f) electrodepositing at least the second electrodepositable coating composition over at least a portion of the first electrodeposited inorganic coating layer to form at least a second electrodeposited inorganic coating layer thereover, thereby forming a multi-layer antireflective inorganic coating over the conductive coating layer,
• wherein each of the first electrodepositable coating composition and the second electrodepositable coating composition is different one from the other, and
• wherein each of the first electrodepositable coating composition and the second electrodepositable coating composition comprises at least one sol prepared from a composition comprising at least one metal oxide precursor and at least one protic acid such that each of the first electrodepositable coating composition and the second electrodepositable coating composition is hydrolyzed.