Production of reversible photochromic layer, comprises reaction of silver or silver compound with the oxidized form of an oxidizing agent, in molar ratio of agent to silver of greater than 2

摘要

Production of a reversible photochromic layer comprising a transparent polymer phase with dispersed silver containing particles comprises production of a photochromic emulsion by reaction of silver or a silver compound with the oxidized form of the oxidizing agent, whereby an excess of oxidizing agent to use to form the emulsion with a molar ratio of oxidizing agent to silver of greater than 2. A process for the production of a reversible photochromic layer of a transparent matrix, comprising a polymer phase with dispersed silver containing particles and with at least one suitable oxidizing agent, at least partially in reduced form, comprises production of a photochromic emulsion by reaction of silver or a silver compound with the oxidized form of the oxidizing agent and processing to form a layer, whereby an excess of oxidizing agent to use to form the emulsion with a molar ratio of oxidizing agent to silver of greater than 2.