| 摘要 |
A reflective optical film comprises a layer containing a polyester voided with inorganic particles such as barium sulfate in a size and an amount sufficient to provide a visible light reflectivity of at least 93%, a void volume of 40 to 70%, the film at least (1) having a thickness of less than 150 mm, or (2) containing UV particles in amounts sufficient to provide a UV light reflectivity of less than 40 %.
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