Method of preparing photochromic article

摘要

PCT No. PCT/AU95/00851 Sec. 371 Date Sep. 8, 1997 Sec. 102(e) Date Sep. 8, 1997 PCT Filed Dec. 15, 1995 PCT Pub. No. WO96/18921 PCT Pub. Date Jun. 20, 1996A process for preparing a cross-linked polymeric article, which process includes: providing a cross-linkable polymeric casting composition; and a photochromic composition; subjecting the cross-linkable polymeric casting composition to partial cure, such that the polymer reaches or exceeds its point of gelation; contacting the partially cured gelled polymer with the photochromic composition; and curing the gelled polymer.