Process for the manufacture of a substrate made of organic glass transparent substrate made of organic glass transparent process for its manufacture and substrate made of transparent organic fotOcrômi

摘要

A method wherein (a) a polymerisable composition (8) consisting of transparent organic glass is fed into a mould; (b) the composition is polymerised under such conditions that the resulting transparent organic glass substrate has at least one thin surface layer (10) polymerised with a degree of completion and/or cross-linking that is substantially lower than in the rest (9) of the substrate; and optionally (c) subjecting the substrate to thermal stress relief annealing. The method is useful for producing finished or semi-finished ophthalmic articles, particularly photochromic ophthalmic articles.