PREPARATION METHOD OF DIFFUSION FILM

摘要

A manufacturing method of light diffusion layer is provided to reduce the manufacturing cost of the light diffusion layer using diffusion particles which the cost is low. The acid component and the glycol component are done the ester exchange reaction. The spreading particle(3) is mixed to the reactant particle. The compound material is condensation-polymerized and the polycondensate is obtained. Polycondensate is uniaxial-stretched with the extrusion to the longitudinal direction(MD). The extended material as described above is biaxial extruded to the traverse direction(TD) to the uniaxial stretching or the traverse direction(TD) and longitudinal direction(MD). The obtained light diffusion layer has the haze of 30~90% and total light transmittance of 70~97% in this way.