| 摘要 |
PURPOSE: A polyester film containing aluminosilicate is provided which has excellent runability while maintaining high transparency by controlling the control of geometric factor of inorganic particles. CONSTITUTION: A polyester film comprises 0.002-0.2% by weight of aluminosilicate having a particle diameter of 0.3-5.0 micrometer and whose geometric factor(f) satisfying the equation; f is less than or equal 0.2 less than or equal phi/6. The polyester film is characterized in that it has high light transmittance, though inorganic particles in an identical amount are added to a film of the identical thickness and its physical property is controlled by the control of geometric factor and average particle diameters of the aluminosilicate.
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