Coating with photochromic properties, method for producing said coating and use thereof applicable to optical articles and glazed surfaces

Coating with photochromic properties applicable to optical articles and glazed surfaces, comprising:

• a coating formed by a polymeric matrix deposited on a surface of an article, in which photochromic compounds are included, wherein
• said photochromic compounds are heat reversible photochromic compounds selected from the group consisting of spirooxazine, azobenzenes and chromenes,
• said photochromic compounds are encapsulated inside hollow and sealed nanocapsules with a diameter between 20-1000 nm,
• said photochromic compounds are dissolved in a liquid solvent that does not react with the photochromic compounds and does not react with the wall or cortex of the nanocapsules, forming a solution inside the nanocapsules,
• said nanocapsules are dispersed inside said polymeric matrix,
• said wall or cortex of the nanocapsules is made of polyamide or melamine and formaldehyde;
• and
• said liquid solvent is a liquid solvent non-miscible with water selected from the group consisting of chloroform and toluene.