LOW REFRACTIVE INDEX COMPOSITION, LOW REFRACTIVE INDEX FILM, OPTICAL MULTILAYER FILM AND ANTIREFLECTION FILM

摘要

PROBLEM TO BE SOLVED: To provide a composition having a low refractive index and excellent in physical strengths and productivity at a low cost. SOLUTION: In the composition comprising as a main component a multi- functional acrylic compound represented by silica sol particles and dipentaerythritol hexacrylate (DPHA), the composition comprises at least 20% of silica sol particles having specific particle diameters (50-100 nm) to form a nano porous structure in the composition film to cause to reduce the apparent refractive index due to the nanoporous structure.