LIGHT DIFFUSION FILM, LAMINATED SHEET THEREOF, AND METHOD FOR PRODUCING SAME

摘要

Disclosed is a light diffusion film having both excellent light transmittance and excellent light diffusion. Also disclosed is a laminated sheet of the light diffusion films. Specifically disclosed is a light diffusion film which is characterized by being composed of a mixture of at least two kinds of incompatible thermoplastic resins and satisfying the following conditions (1)-(4) at the same time. (1) The total light transmittance is not less than 66%. (2) The haze is not less than 96%. (3) The parallel light transmittance is not more than 2.0%. (4) The diffusion ratio (DH/DL) of the transmitted light as measured by a goniophotometer mentioned in the description at an incident angel of 0° is not more than 2.0. (With respect to DH and DL, an angle width at a half height of the peak height (half width) of the varied angle luminous intensity curve of the transmitted light as measured by an automatic goniophotometer is determined by fixing the winding direction of the light diffusion film to the vertical direction or the horizontal direction, and the higher half width is taken as DH and the lower half width is taken as DL.)