Patent ID: 8029884

Claim:
An antistatic white polyester film for a surface illuminant reflector, having a thickness of 25 μm to 250 μm, a base material layer formed by using a polyester resin and an applied antistatic layer having a surface resistivity of 3×10 12 Ω/sq or less at a temperature of 23° C. and at a relative humidity of 50%, wherein an average reflectivity at a wavelength of 400 to 700 nm is 90% or more and a gloss level at 60° is 20 or less on the surface of the antistatic layer; a difference in gloss level at 60° between one surface and the other surface of the polyester film is 5 to 80; the base material layer comprises a layer A and a layer B in a three-layer constitution of layer B/layer A/layer B; the layer A is a polyester composition layer including barium sulfate particles having an average particle size of 0.1 to 10 μm in an amount of 21 to 60% by weight relative to that of the layer A and/or rutile-type titanium dioxide particles having an average particle size of 0.1 to 5.0 μm in an amount of 1 to 40% by weight relative to that of the layer A; the layer B is a polyester composition layer including barium sulfate particles having an average particle size of 0.1 to 10 μm in an amount of 0.1 to 15% by weight relative to that of the layer B and/or rutile-type titanium dioxide particles having an average particle size of 0.1 to 5.0 μm in an amount of 1 to 15% by weight relative to that of the layer B; and the layer A contains more inorganic particles than layer B.