| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a white laminated polyester film for a reflecting plates which is free from the releasing between laminated layers, and is less prone to breaking and which can be produced with high productivity, while having a high reflectance and high hiding property. <P>SOLUTION: The white laminated polyester film for reflecting plates is a biaxial oriented film which is laminated by a co-extruding method of at least a polyester layer (A) and a polyester layer (B) containing cavities, and satisfies the following (1)-(4). (1) The layer (A) has a polyethylene terephthalate or polyethylene naphthalate as a basic configuration, and contains at least one kind or more copolymerized component. (2) The layer (B) has the polyethylene terephthalate as a basic configuration, and contains at least one kind or more copolymerized component (i) contained in the layer (A) and a resin and/or inorganic particles (ii) not compatible with polyester. (3) The melting points of the layer (A) and the layer (B) are in specified ranges. (4) The average reflectance to a light having wavelength of 400-700 nm of at least on one side surface is 95.0% or higher and the total light transmittance is 5.0% or lower. <P>COPYRIGHT: (C)2008,JPO&INPIT |
