Method of making light-polarizing particles
AssigneeResearch Frontiers Incorporated
InventorsJoseph A. Check, III, Steven M. Slovak, Robert I. Thompson
Life of this patent
Estimating the term…
Abstract
A method of making crystals of a light-polarizing material useful in a liquid light valve suspension with the addition of controlled amounts of water relative to the amount of reactants used in making the particles of the light-polarizing material.
Claims5
A method of preparing particles of a light-polarizing material, which comprises reacting (i) elemental molecular iodine, (ii) a hydrohalide acid and/or an ammonium or alkali metal or alkaline earth metal halide, and (iii) a precursor compound selected from the group consisting of metal ion-chelating heterocyclic compounds containing a nitrogen atom in the heterocyclic ring, in the presence of a solution of a polymeric stabilizer in a non-aqueous solvent in which the precursor compound and the light-polarizing material are at least substantially insoluble, and in the presence of an amount of water effective to cause the formation of particles of said light-polarizing material but less than an amount which results in the formation of particles of said light polarizing material having an average particle length in excess of 1 micron.
Dependencies are inferred from the claim text.