| 摘要 |
<p>PURPOSE:To readily obtain a large amount of fine infrared rays-scattering agent having high quality by separating plural species of water-soluble inorganic substance from plural aqueous solutions of water-soluble inorganic substances having different refractive index and permeable of infrared rays and drying. CONSTITUTION:Aqueous solutions of at least two water-soluble inorganic substances having different refractive indices (preferable example; combination of CsI or CsBr and KBr or NaCl, etc.) having refractive indices of at least one species differing at least 0.1 from other inorganic substance and <=1/3 surface reflection loss (preferably <=1/5) and permeable of infrared rays is prepared. Then, each of the at least two water-soluble inorganic substances is separated from said aqueous solutions, thus dried with separating to solid and liquid or without solid-liquid separation to afford the aimed infrared rays-scattering agent.</p> |
