Method for preparing coloring layer composition for chromatic device

摘要

The present invention relates to a method for preparing a coloring layer composition for a chromatic device comprising a step of preparing a peroxotungstic acid solution comprising a solute including WO3+574 aNb2O5+574 bH2O2+574 cH2O (a, b, and c represent a positive number), water for dispersing and holding the solute, and an organic solvent compatible with water, and aging the peroxotungstic acid solution to obtain a polymer. According to the method of the present invention, a large size chromatic device can be reliably produced at a low cost. Further, a composition having a sufficient coloring effect and a quick response speed of the coloration-bleaching change in the chromatic device can be prepared.