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1. (WO2016052133) LAYERED PRODUCT

Pub. No.:    WO/2016/052133    International Application No.:    PCT/JP2015/075776
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Sat Sep 12 01:59:59 CEST 2015
IPC: B32B 27/36
B32B 27/40
C08J 7/04
H01L 31/049
Inventors: TATSUMI, Noriyuki
HORIE, Masato
SENDAI, Toshihiro
A layered product characterized by comprising a base layer (layer P1) including, as a main component, a polyester resin having a terminal carboxyl group amount of 25 equivalents or less per ton and a readily bondable layer (layer P2), the layer P2 satisfying the following requirements (1) and (2): (1) to have a polar force γp of 4.8-21.0 mN/m, and (2) to have a difference between the polar force γp and the hydrogen bonding force γh, γp-γh, of 1.0-20.0 mN/m. Layered products produced by conventional methods have had a problem wherein the adhesion to encapsulating materials is so low that separation at the boundary with the encapsulating material or delamination thereof from the readily bondable layer is prone to occur not only during the fabrication of solar cells but also during outdoor use as solar cells. In view of such conventional problem, the present invention provides the layered product which is superior to conventional, readily bondable, layered products in adhesion to encapsulating materials and which is suitable for use as a sheet for protecting the back surfaces of solar cells which retain the adhesion (excellent adhesion retentivity) even when placed outdoors for a long period.