| 摘要 |
PROBLEM TO BE SOLVED: To provide a coextrusion laminated white biaxially oriented polyester film which has high whiteness and hiding property and moreover can maintain high degree of whiteness and hiking property even if it is exposed to ultraviolet rays or variations of temperature and humidity. SOLUTION: A coextrusion laminated biaxially oriented polyester film is provided, wherein a layer (layer A) containing a white pigment (a) of 2-40wt.% is disposed at least at the outermost layer and at least one layer (layer B) containing white pigment (b) or (c) is diposed at a layer other than the outermost layer. The pigment (a) is anatase type titanium dioxide having a mean particle diameter of 0.1-1.0μm and substantially containing no zinc compound nor aluminum compound and the pigment (b) is an anatase type titanium dioxide having a mean particle diameter of 0.1-1.0μm and containing an aluminum compound, and the pigment (c) is anatase type titanium dioxide having a mean diameter of 0.1-1.0μm and containing a zinc compound. |
