| 摘要 |
PROBLEM TO BE SOLVED: To provide a void-containing polyester film used in a reflection sheet for LED illumination applicable for households and facilities, where the film has high light reflective performance, particularly excellent dead holding performance.SOLUTION: A void-containing polyester film has a layer structure of A layer/B layer/A layer, where the A layer has a peak intensity (BO value) obtained by X-ray diffraction intensity measurement of 0.5-2.0, and the B layer has a crystal size Xc of 6.5-8.0 nm.SELECTED DRAWING: None |
