| 摘要 |
<p>In view of the above problems of the art, it is an object of the present invention to provide a white polyester film which achieves a high reflectivity and a high hiding property simultaneously, and hardly causes a film break and has high productivity. This object can be achieved by a white polyester film containing voids therein, wherein a resin constituting the film has a layer formed by using a polyester resin and a cyclic olefin copolymerized resin, and wherein a ratio of the void in a cross-section of the layer is more than 25% and 75% or less and the average particle size on number of the cyclic olefin copolymerized resin in the film is 0.1 µm or more and 3 µm or less.</p> |
