| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a void-containing polyester-based resin film or sheet, having sufficient heat-insulating properties as a recipient sheet material for thermal transfer recording, and exhibiting more improvement of reflection coefficient as a base material for a reflector. <P>SOLUTION: The void-containing polyester-based resin film or sheet comprises (A) a polyester-based resin and (B) a thermoplastic resin incompatible with the polyester-based resin (A), and has 0.7-1.3 apparent specific gravity as the whole. The content of the voids contained in the surface layer from at least one surface to 3 μm depth is 5-35 vol.% and the average content of the voids in the whole layer is 8-50 vol.%. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
