| 摘要 |
PURPOSE:To obtain a polyester film for prepaid card containing substance having dichroism of light, having a specific degree of face orientation and useful for a device utilizing the difference of light permeability in distinguishing cards. CONSTITUTION:(A) Polyester is blended with (B) at least one kind of substances (e.g., formula I or formula II) having dichroism of light to provide the aimed film having >=0.05 degree of face orientation. Furthermore the blend amount of component B is preferably 0.001-0.5wt.%. |
