METHOD FOR THE PRODUCTION OF AN OPTICAL ARTICLE WITH IMPROVED ANTI-FOULING PROPERTIES

The present invention is dedicated to a method for the manufacture of an optical article comprising the following steps: providing a substrate having two main faces and bearing -OH functions on at least one of its faces, successively exposing one face of the substrate bearing -OH functions to at least 2 distinct materials named M1 and M2, M1 having a weight average molecular weight higher than M2, in a vacuum chamber under conditions resulting in the deposit of those materials on the surface of the substrate, and wherein: M1 is a substituted silane comprising: at least one function X1 bonded to a silicon atom, wherein the Si-X1 group is capable of forming a covalent bond with a -OH group of the substrate and/or a covalent bond with M2, and at least one fluorine containing group, M2 is a substituted silane having a number average molecular weight inferior or equal to 900 g/mol, comprising: at least one function X2 bonded to a silicon atom, wherein the Si-X2 group is capable of forming a covalent bond with a -OH group of the substrate and/or a covalent bond with M1, and at least one hydrophobic and/or oleophobic group, or at least one hydrophilic group, wherein the difference between the weight average molecular weight of M1 and the weight average molecular weight of M2 is higher than or equal to 600 g/mol.