NIR-REFLECTIVE MULTI-LAYER MATERIAL SHEET

The present invention relates to a multi-layer material sheet comprising an NIR-reflective, translucent polymeric layer having a reflectance of more than 20% of all light with a wavelength from 750 nmto 1,000 nm and a transmission of more than 50% of all light with a wavelength from 380 nm to 750 nm and an NIR-reflective, colored polymeric layer having a reflectance of more than 25% of all lightwith a wavelength from 1,000 nm to 2,100 nm. The present invention also relates to a backsheet suitable for use in a photovoltaic module, said backsheet comprising said multi-layer material sheet; andto a photovoltaic module comprising said backsheet. 本发明涉及多层材料片材，其包含NIR-反射性半透明聚合物层和NIR-反射性有色聚合物层，所述NIR-反射性半透明聚合物层对波长750nm至1000nm的所有光的反射率超过20％并且对波长380nm至750nm的所有光的透射率超过50％，所述NIR-反射性有色聚合物层对波长1000nm至2100nm的所有光的反射率超过25％。本发明还涉及适合在光伏模块中使用的背板，所述背板包含所述多层材料片材；并且涉及包含所述背板的光伏模块。