A NIR-ABSORBING HARD COAT FORMULATION AND ITS METHOD OF PREPARATION

摘要

The invention concerns an optical article comprising a transparent substrate having at least one surface coated with a near infra-red absorbing layer obtained by depositing a sol-gel composition on said surface and then curing said sol-gel composition,said sol-gel composition being prepared by hydrolyzing and condensing a sol-gel precursor,said sol-gel composition comprising metal oxide nanoparticles dispersed therein, wherein the amount of metal oxide nanoparticles dispersed in said sol-gel composition is such that the ratio R = (dry content of metal oxide nanoparticles) / (dry content of sol-gel precursor) is higher than or equal to 0.2.;The invention also concerns a method for preparing said sol-gel composition and said optical article.