WHITE POROUS POLYESTER FILM FOR SURFACE LIGHT SOURCE-REFLECTING PLATE

摘要

PURPOSE: A white porous polyester film for a surface light source-reflecting plate and a surface light source reflecting plate containing the polyester film are provided, to improve the reflectivity and the coverage of the film and to reduce the manufacturing cost of a surface light source reflecting plate. CONSTITUTION: The white porous polyester film comprises 100 parts by weight of the resin comprising 80-95 wt% of a polyester resin and 5-20 wt% of a polypropylene resin; 0.2-1.0 parts by weight of a compatibilizer; 1-10 parts by weight of an inorganic fine particle having a diameter of 0.01-1 micrometers; and 0.01-0.2 parts by weight of a whitening agent. The white porous polyester film has a reflectivity of an average 90 % or more at a wavelength range of 400-700 nm, L* of 95.00 or more and b* of -3.00 or less in CIELAB system, and a density of 0.8-1.3 g/cm¬3.