| abstract |
The invention provides a foamed diffused reflector which has a bubble structure, and the bubble structure is precisely controlled, has a high bubble rate, and has a plurality of fine surface openings precisely controlled, so that a very excellent diffusion can be exhibited. Reflective properties and excellent heat resistance and mechanical strength. The foamed diffused reflector of the present invention contains a foam having an open cell structure having through-holes between adjacent spherical cells, and the foam contains a hydrophilic polyurethane-based polymer. The average pore diameter of the gas bubbles is less than 20 μm, the average pore diameter of the through holes is 5 μm or less, and the surface opening portion having an average pore diameter of 20 μm or less and a wavelength region of 400 nm to 600 nm on the surface of the foam body The diffuse reflectance in the medium is 90% or more. |