| 摘要 |
PROBLEM TO BE SOLVED: To provide a foam diffuse reflector with a bubble structure that has a minutely controlled bubble structure with high air content and multiple minutely controlled fine surface openings, and exhibits excellent diffuse reflection, as well as excellent heat resistance and mechanical strength.SOLUTION: The foam diffuse reflector according to the present invention includes a foam body which has a continuous bubble structure having through-holes between adjoining spherical bubbles, and the foam body includes a hydrophilic polyurethane polymer. The average bubble diameter of the spherical bubbles is less than 20 μm and the average pore diameter of the through-holes is 5 μm or less. The foam body has surface openings with an average pore diameter of 20 μm or less on the surface thereof, and the diffuse reflection ratio within the wavelength range from 400 nm to 600 nm is 90% or more. |
