| abstract |
[PROBLEMS] To provide a polarizing particle capable of obtaining a film for a suspended particle device excellent in heat resistance and light resistance in which, when used for a long time in an environment exposed to high temperature or light, the contrast decrease is extremely small. To do. In a method for producing polarizing particles of a suspended particle device, calcium iodide, iodine, and pyrazine-2,5-dicarboxylic acid are reacted in a solvent in the presence of a dispersant to form an intermolecular compound. As the dispersant, nitrocellulose having a nitrogen content defined by Japanese Industrial Standard (JIS) K-6703 of 11.5-12.2% and a weight average molecular weight of 20,000-60,000 is used. A method for producing polarizing particles of a suspended particle device comprising a polyiodide comprising iodine and calcium iodide and pyrazinedicarboxylic acid, and a suspension containing the polarizing particles thus obtained. Film for turbid particle devices. [Selection figure] None |