| abstract |
The present invention provides an outdoor urethane adhesive having excellent initial adhesiveness, adhesiveness after curing, and flexibility after curing, and preferably weather resistance, using a solar cell back sheet obtained by using the adhesive and a solar cell back sheet thereof. It provides the solar cell module obtained. Polyurethane resin (A) obtained by reaction of an isocyanate compound (a1) and the polyol (a2) which has an ester bond, The isocyanate compound (a1) contains at least 1 sort (s) chosen from aliphatic isocyanate and alicyclic isocyanate, The outdoor urethane adhesive (A) in which (a2) contains both a polyester polyol (a2-1) and an acrylic polyol (a2-2) is excellent in initial adhesiveness, adhesiveness after hardening, and flexibility of the film after hardening. . When the hydroxyphenyltriazine-based compound is further included, the color difference change is small, and the weather resistance is excellent. |