Light polarizing materials and suspensions thereof

摘要

Light-polarizing materials comprising a complex obtained by reacting elemental iodine, and iodide and a monoalkyl- or dialkyl-piperazinedione or an unsubstituted or monoalkyl- or dialkyl- substituted 2,5-dicarboxy-pyrazine, and uses thereof in liquid suspensions, set suspensions and light valves.