ABRASION AND/OR SCRATCH RESISTANT ARTICLE COMPRISING AN IMPACT RESISTANT PHOTOCHROMIC POLYURETHANE COATING, AND PROCESS OF PREPARATION THEREOF

摘要

The invention relates to a process for obtaining an impact resistant, abrasion and/or scratch resistant photochromic article comprising a substrate having two main faces, comprising the steps of: i) preparing a curable coating composition comprising at least one unblocked polyisocyanate terminated polyurethane pre-polymer, at least one polyol and at least one photochromic agent, and optionally at least one solvent; ii) depositing the prepared curable coating composition onto at least part of a main face of the substrate; iii) curing the above curable coating composition for 10 minutes or less, at a temperature lower than or equal to 100°C so as to form an impact resistant photochromic coating; iv) forming an abrasion and/or scratch resistant coating on the impact resistant photochromic coating or forming a protective coating on the impact resistant photochromic coating and then forming an abrasion and/or scratch resistant coating on said protective coating. The invention also relates to the article obtainable by the above process, preferably an ophthalmic lens, and to the curable coating composition involved in such process.