| abstract |
[PROBLEMS] To provide a lower refractive index that can be formed at room temperature and pressure, has excellent adhesion to a solid substrate, and does not impair the properties such as diffusibility and light condensing property brought about by a fine structure. Provide rate membrane. Low refraction in which a silicon compound solution is brought into contact with a fine particle laminated film formed by alternately adsorbing an electrolyte polymer and fine particles on the surface of a solid substrate to bond the solid substrate with the fine particles and the fine particles. A silicon compound solution comprising (1) an alkoxysilane (I) having a functional group composed only of a hydrolyzable group, (2) a hydrolyzate of (I), and a condensation reaction product of the hydrolyzate ( II), and (3) any one of the mixture of (I) with a hydrolyzate and a condensation reaction product (II) of the hydrolyzate, and as a low surface tension component, an HFE system, an HFC system, and a PFC system A low refractive index film having a fine structure on its surface. [Selection] Figure 5 |