| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a biaxially-oriented polyester film for solar cell rear-surface sealing having hydrolysis resistance and UV resistance, as well as, low haze and low shrinkage. <P>SOLUTION: The biaxially-oriented polyester film for solar cell rear-surface sealing is a biaxially-oriented polyester film containing an ultraviolet absorbent, wherein the average value of light transmittance in a light wavelength range of 400-650 nm (Tave) is 75.0% or higher; as well as, the light transmittance at a light wavelength of 380 nm (Tuv) is 60.0% or lower; the content of antimony element in the polyester film is 10 ppm or less; the content of titanium element is 20 ppm or less; the content of phosphorus element is 170 ppm or less; the amount of terminal carboxyl group is 26 equivalent weight/t or less; the limiting viscosity is 0.65 dl/g or higher; and the heat shrinkage in a longitudinal direction of the film after a treatment for 30 minutes at 150°C is 0.8% or lower. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
