White polyester film and reflection sheet

摘要

A white polyester film containing voids, wherein a resin constituting the film has a layer (layer A) formed by using a polyester resin and a cyclic olefin copolymerized resin, and wherein a void ratio taken in a cross-section of the layer is more than 25% and 75% or less and the average particle size of the cyclic olefin copolymerized resin in the film is 0.1 μm or more and 3 μm or less.