| 摘要 |
<p>A polyester film which comprises a composition comprising a copolymerization polyester and fine inorganic particles, wherein the composition contains 30 to 50 wt % of the fine inorganic particles and the film exhibits a thermal shrinkage at 85°C of 0.7 % or less and that at 150 °C of 5.0 % or less both in the longitudinal and transverse directions and an average reflectance of 90 % or more in the range of wavelength of 400 to 700 nm. The polyester film is a white polyester film which maintains practically sufficient performance capabilities for the reflection in the visible light region, can be stably formed even when it contains fine inorganic particles at an enhanced concentration, and is reduced in the dimensional change by the heat from a light source.</p> |
