| abstract |
PROBLEM TO BE SOLVED: To provide a high diffusion plastic sheet for more effectively reducing scintillation. SOLUTION: At least one diffusion layer (A) and two or more diffusion layers (B), and optionally including a layer (C) not containing a diffusing agent, has a thickness of 1 to 5 mm and a haze of 80% or more , A plastic sheet having a total light transmittance of 80% or more, wherein the diffusion layer (A) is 100 parts by weight of the first base plastic, the average particle diameter is 2 to 6 μm, and the refractive index is X−0.02 to X + 0. .02 (X is the refractive index of the first base plastic) and 0.2 to 1.5 parts by weight of the first light diffusing fine particles, the diffusion layer (B) is 100 parts by weight of the second base plastic, and the average particles Including 10 to 30 parts by weight of second light diffusing fine particles having a diameter of 10 to 18 μm and a refractive index of Y−0.03 to Y + 0.03 (Y is the refractive index of the second base plastic), and two layers A plastic sheet in which a diffusion layer (A) or a layer (C) containing no diffusing agent is interposed in at least one of the layers of the diffusion layer (B). [Selection] Figure 1 |