Patent ID: 9327460
Filing Date: 2016-05-03
CPC Classification: B29D,G02B,G02C,Y10T

Claim Text:
1. A process for manufacturing a transparent optical element comprising: a) providing an optical element having a surface with at least one open cell; b) carrying out a surface treatment of said cell, the surface treatment increasing the wettability of the surface; c) preparing a solution comprising: d) adding an acid or base hydrolysis catalyst to the solution so as to obtain a sol; e) depositing the sol in the pretreated cell before the gel point of the sol is achieved and sealing the filled cell using a film; f) leaving the optical element to stand in an alcoholic atmosphere for between 15 minutes and 5 hours in order to mature the gel; g) removing the film sealing the cell in an alcoholic medium; h) carrying out, in an autoclave, supercritical drying of the gel contained in the cell so as to obtain an aerogel.