Optical article comprising a precursor coating for an antifogging coating and a temporary layer rendering same suitable for edging

Abstract

The present invention concerns an optical article comprising a substrate, at least one of the main surfaces of which is coated with a first coating comprising, at its surface, silanol groups and, in direct contact with this coating, a second coating which is a precursor for an antifog coating, the second coating being formed by deposition, on the first coating, of at least one compound A having a polyoxyalkylene group, and at least one group capable of establishing a covalent bond with a silanol group, wherein the second coating comprises an internal part, in which compound A is grafted to the first coating, and an external part, which can be removed by washing and/or wiping, resulting from the deposition of the compound A, and wherein the second coating is coated with at least one temporary layer comprising at least 50% by weight of silica.

Dependencies are inferred from the claim text.