| 摘要 |
PURPOSE:To obtain the balance of light transmissivity, diffusibility and concealability by a small amt. of a light diffusing agent by dispersing two kinds of light diffusing agents in a methacrylic resin and setting the average particle diameter thereof and the differences of a refractive index between the difusing agents and the methacrylic resin to specific values and setting the amt. ratio of the fine particles of the diffusing agents and the sum total amt. thereof to specific values. CONSTITUTION:A light diffusing agent composed of fine particles A of which the average particle diameter is 1.5-5mum and the difference of a refractive index with the methacrylic resin is 0.05-below 0.08 and a light diffusing agent composed of fine particles B of which the average particle diameter 2-15mum and the difference of a refractive index with the methacrylic resin is 0.08-below 0.11 are dispersed in the methacrylic resin. The absolute values of the differences of a refractive index of the fine particles A, B are 0.01-0.04 and the amt. ratio of the fine particles A, B is set to 20/80-80/20 and the sum total amt. thereof is set to 6-60g/m<2> per a panel area. The fine particles A are pref. composed of a crosslinked siloxane polymer and the fine particles B are pref. composed of a crosslinked styrenic polymer because the color tone of transmitted light becomes favorable. |
